Manufacturing method for buckling-restrained building materials

Abstract

The objective is to provide a method for manufacturing buckling-restrained building materials that can efficiently produce buckling-restrained building materials with an appropriate gap by adjusting the amount of gap between the core material and the core material-facing surface of the buckling-restraining member. [Solution] In the manufacturing method A for buckling-restrained braces, the buckling-restrained brace 1a before adjustment is placed across two base parts 6 installed on the floor. In addition, in the manufacturing method A for buckling-restrained braces, a measuring mechanism B is used to measure in real time the amount of gap during adjustment when the core material 2 is tightened with the two buckling-restraining members 3a and 3b.

Description

[Technical Field]

[0001] This invention relates to a method for manufacturing buckling-restrained building materials. More specifically, it relates to a method for manufacturing buckling-restrained building materials that can efficiently produce buckling-restrained building materials having an appropriate gap by adjusting the amount of gap between the core material and the core material-facing surface of the buckling-restraining member. [Background technology]

[0002] To improve the seismic performance of buildings, buckling-restrained building materials are used that are incorporated between the stories of the main framework of a building. These materials absorb energy by undergoing plastic deformation when inter-story deformation occurs, thereby suppressing damage to the structure.

[0003] As an example of such buckling-restrained building material, a buckling-restrained brace is known, in which a core steel material is sandwiched between two buckling-restrained members and restrained in an integrated manner, thereby preventing buckling of the core material.

[0004] In buckling-restrained building materials such as buckling-restrained braces, a load that compresses the core material in the longitudinal direction may be applied. When this load is applied, the core material does not buckle but exhibits appropriate restoring force, allowing the buckling-restrained building material to also function as an earthquake-resistant or vibration-damping member.

[0005] In order for buckling-restrained building materials to function as seismic-resistant or vibration-damping members, it is important to secure a predetermined amount of clearance with high precision between the core material and the opposing core material surfaces of the two buckling-restrained members.

[0006] More specifically, if this gap is too wide, when the core material is subjected to axial compressive load, the core material will undergo localized plastic deformation in the direction opposite to the two buckling restraint members (the direction perpendicular to the longitudinal direction of the core material, and the direction in which the two buckling restraint members face each other).

[0007] On the other hand, if this gap is too narrow, when the core material is subjected to axial compressive load, the core material will be restricted by the two buckling restraint members, and will not be able to deform sufficiently in the opposing directions of the two buckling restraint members. As a result, the compressive axial force of the core material will flow to the buckling restraint members.

[0008] In this context, for example, Patent Document 1 proposes a buckling-restrained building material in which a core material is sandwiched between two buckling-restraining members, wherein a gap-holding member is interposed between the two buckling-restraining members on the longitudinal side of the core material to secure a predetermined amount of gap between the core material and the core material-facing surfaces of the two buckling-restraining members.

[0009] Furthermore, as an alternative structure for securing a predetermined amount of gap in buckling-restrained building materials, a structure has been adopted in which a sandwiched member, such as rubber, is inserted between the core material and the core material-facing surfaces of the two buckling-restrained members and joined together.

[0010] In a structure in which a clamped member, such as rubber, is sandwiched between the core material and the opposing core material surfaces of two buckling-restraining members, it is necessary to precisely control the thickness of the clamped member after it has deformed due to the clamping process, thereby ensuring a predetermined amount of clearance.

[0011] Therefore, in the conventional manufacturing process for buckling-restrained building materials, in order to secure a predetermined gap with high precision, the outer surfaces of two buckling-restrained members were clamped and fixed with a fixing device such as a C-clamp. Then, in this fixed state, the height dimension (outer dimension) of the buckling-restrained building material, which is the distance between the outer surfaces, was measured using a caliper.

[0012] In this way, the height dimension (outer dimension) of the buckling-restrained building material was measured, and it was confirmed whether the measured value fell within the range of the ideal height dimension calculated from the thickness values ​​of each component and the desired amount of gap.

[0013] In other words, the process involved repeatedly tightening the fasteners and then stopping the tightening to measure the height with calipers until the buckling-restrained building material reached the desired height dimension that reflected a predetermined amount of gap. Furthermore, measurements were taken with calipers at multiple different locations along the longitudinal direction of the buckling-restrained member to ensure measurement accuracy. [Prior art documents] [Patent Documents]

[0014] [Patent Document 1] Patent No. 6644370 specification [Overview of the project] [Problems that the invention aims to solve]

[0015] However, in the conventional manufacturing process for buckling-restrained building materials, as described above, it was necessary to temporarily stop tightening with the fasteners each time and have the worker manually measure with calipers in that state, which meant that it took time until the buckling-restrained building material reached the desired height.

[0016] Furthermore, because measurements using calipers were taken at multiple different locations while the tightening process was temporarily stopped, there was a problem in that multiple workers were required to improve manufacturing efficiency.

[0017] The present invention was conceived in view of the above points, and aims to provide a method for manufacturing buckling-restrained building materials that can efficiently produce buckling-restrained building materials having an appropriate gap by adjusting the amount of gap between the core material and the core material-facing surface of the buckling-restraining member. [Means for solving the problem]

[0018] To achieve the above objective, the present invention provides a method for manufacturing a buckling-restrained building material comprising a core material, two buckling-restraining members that sandwich the core material, and a clearance adjustment material which is an elastic body disposed between the core material and the core material-facing surfaces of the two buckling-restraining members to secure a gap, wherein the method includes a clearance adjustment step in which the core material and the clearance adjustment material are tightened with the two buckling-restraining members, the amount of the gap is changed, the distance between the outer peripheral surfaces of the buckling-restraining members along the direction in which the core material is sandwiched is measured in real time, and the buckling-restraining members are tightened until the distance between the outer peripheral surfaces falls within a predetermined target range.

[0019] Here, a clearance adjustment material, which is an elastic body positioned between the core material and the core material-facing surfaces of the two buckling-restraining members to secure a gap, adjusts the amount by which the two buckling-restraining members tighten the core material and the clearance adjustment material along the direction in which the core material is sandwiched, deforms the clearance adjustment material, and adjusts the gap between the core material and the core material-facing surfaces of the two buckling-restraining members to a desired amount.

[0020] Furthermore, in the clearance adjustment process, the core material and clearance adjustment material are tightened with two buckling restraint members, and while changing the amount of gap, the distance between the outer surfaces of the buckling restraint members along the direction of clamping the core material is measured in real time. This allows the amount of gap to be adjusted based on the measured value of the distance between the outer surfaces of the buckling restraint members, without having to stop the tightening of the buckling restraint members each time.

[0021] Furthermore, in the clearance adjustment process, the distance between the outer surfaces of the buckling restraint members along the direction of core material insertion is measured in real time. By tightening the buckling restraint members until the distance between the outer surfaces falls within a predetermined target range, the tightening is terminated when the distance between the outer surfaces falls within the predetermined target range, thereby constructing a structure in which the amount of gap between the core material and the core material-facing surfaces of the two buckling restraint members is within an appropriate range.

[0022] Furthermore, when calculating the distance between the outer surfaces based on the measured distance from a measuring unit located at a predetermined position to the outer surface of one of the buckling-restraining members, it becomes possible to measure the distance between the outer surfaces of the buckling-restraining members without having to clamp the two buckling-restraining members with a measuring instrument such as a caliper, thereby increasing the efficiency of measurement.

[0023] Furthermore, when the other buckling restraint member is placed at a predetermined height, and one buckling restraint member is placed on top of it, and a mounting member is attached to the other buckling restraint member, and the measuring unit is positioned above the outer surface of one buckling restraint member via the mounting member, the position of the measuring unit in the height direction is determined by the other buckling restraint member and the mounting member. In addition, the measurement by the measuring unit makes it possible to check the change in distance between the position of the measuring unit and the position of the outer surface of one buckling restraint member, which descends in response to tightening. In the clamping direction of the core material (vertical direction), the thickness of the core material, the thickness of the two buckling restraint members, and the thickness of the clearance adjustment material before tightening are constant values, so this change in distance can be captured as a change in the amount of gap between the core material and the core material opposing surfaces of the two buckling restraint members. As a result, the distance between the outer surfaces of the two buckling restraint members can be calculated by considering the value of the change in the amount of gap. Furthermore, by measuring this change in distance in real time, the distance between the outer surfaces of the two buckling restraint members can also be calculated in real time.

[0024] Furthermore, if multiple measurement points are provided along the longitudinal direction of the buckling restraint member, the distance between the outer surfaces of two buckling restraint members can be determined from measurements at multiple locations, thereby improving the accuracy of the measurement results.

[0025] Furthermore, if the measurement unit is a laser displacement meter, measurement results can be obtained quickly with a simple mechanism, without the need for manual intervention.

[0026] Furthermore, if the clearance adjustment material has a setting process that determines the size and number of clearance adjustment materials to be placed based on the compressive elastic stiffness obtained from the relationship between the load applied in the thickness direction and the amount of displacement in the thickness direction, it becomes easier to select the clearance adjustment material to bring the amount of gap between the core material and the core material opposing surfaces of the two buckling-restrained members within the desired range. In other words, since the size and number of clearance adjustment materials to be placed can be set in advance based on the value of the desired amount of gap, it becomes unnecessary to blindly adopt the thickness, size, and number of clearance adjustment materials and perform measurements, thereby increasing the efficiency of manufacturing buckling-restrained building materials.

[0027] Furthermore, if the clearance adjustment material is butyl rubber, it can be made relatively inexpensive and have excellent shock energy absorption properties. [Effects of the Invention]

[0028] The method for manufacturing buckling-restrained building materials according to the present invention is a method that allows for the efficient manufacture of buckling-restrained building materials having an appropriate gap by adjusting the amount of the gap between the core material and the core material-facing surface of the buckling-restraining member. [Brief explanation of the drawing]

[0029] [Figure 1] This diagram shows the structure of a buckling-restrained brace; (a) is an exploded perspective schematic, and (b) is a front schematic. [Figure 2] This is a schematic diagram showing the measurement mechanism and its surrounding structure used in a method for manufacturing buckling-restrained building materials, which is an embodiment of the present invention. [Figure 3] This is a schematic partial cross-sectional view showing the positional relationship between the buckling-restraining member and the laser displacement meter as viewed from the longitudinal direction of the buckling-restraining brace. [Figure 4] This is a schematic partial cross-sectional view showing the height of the buckling-restrained brace, etc. [Figure 5] This figure shows an example of image display on the display unit of a PC terminal. [Figure 6]This is a schematic diagram showing the structure of the loading device. [Figure 7] (a) is an illustrative diagram showing the application of a load to butyl rubber sandwiched between a top plate and a base, and (b) is a schematic diagram showing the center position of the butyl rubber and the positions of the three measurement points of the high-sensitivity displacement meter in a plan view. [Figure 8] This graph shows experimental data measuring the amount of shrinkage in butyl rubber with a thickness of 1 mm. [Figure 9] This graph shows experimental data measuring the amount of shrinkage in butyl rubber with a thickness of 2 mm. [Figure 10] This graph shows experimental data measuring the amount of shrinkage in butyl rubber with a thickness of 5 mm. [Figure 11] This graph shows experimental data measuring the amount of shrinkage in butyl rubber with thicknesses of 1 mm, 2 mm, and 5 mm. [Figure 12] This is a model diagram showing the content of the verification conditions in the clearance adjustment material setting process. [Figure 13] This is a schematic diagram showing the dimensions of the buckling restraint members at each position. [Figure 14] This is a schematic diagram showing a core material with an end-expanded shape. [Figure 15] This is a schematic diagram showing the dimensions of the core material at each position. [Figure 16] This is a schematic diagram showing the dimensions of each position on the end side of the core material. [Figure 17] This is a schematic diagram showing the height of the ribs in the cross-section of the joint. [Figure 18] This is a schematic diagram showing the thickness of the ribs in the cross-section of the core reinforcement section. [Figure 19] This is an illustrative diagram for calculating the application area of ​​butyl rubber. [Figure 20] This is a schematic diagram showing the number of butyl rubber sheets placed on the top surface of the core material. [Figure 21] This is a schematic diagram showing the contact area between the core material and the concrete (filler). [Figure 22] This is an illustrative diagram showing the size of one sheet of butyl rubber. [Modes for carrying out the invention]

[0030] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as "embodiments") will be described with reference to the drawings.

[0031] In the following explanation, using Figure 1(a) as a reference, the top of the figure will be referred to as "upper" or "upper side," and the bottom of the figure will be referred to as "lower" or "lower side." The direction connecting the upper and lower parts will be referred to as the "upper and lower direction."

[0032] First, the structure of the buckling-restrained brace 1 manufactured by manufacturing method A of the present invention will be described.

[0033] As shown in Figure 1(a), the buckling-restrained brace 1 comprises a core material 2 and two buckling-restraining members 3a and 3b.

[0034] This buckling-restrained brace 1 is a type of buckling-restrained building material that is incorporated between the stories of the main framework of steel-frame and steel-reinforced concrete buildings. When inter-story deformation occurs, it undergoes plastic deformation to absorb energy and suppress damage to the structure.

[0035] Furthermore, the core material 2 is a member that bears axial force and is made of steel plate core material (steel material). In addition, the buckling restraint members 3a and 3b are members that sandwich the core material 2 from above and below, and integrate with the core material to construct the outer shape of the buckling restraint brace 1.

[0036] Furthermore, buckling restraint members 3a and 3b have the same structure and are constructed by filling a channel-shaped member 30, which is made by bending a steel plate (steel material), with concrete 31 (filler) (see Figures 1(a) and 1(b)).

[0037] Furthermore, when the core material 2 is sandwiched between the two buckling restraint members 3a and 3b and integrated, the overlapping portion of the buckling restraint members 3a and 3b (indicated by the symbol W in Figure 1(b)) is welded.

[0038] Furthermore, the core material 2 is flat in shape, and in a cross-section perpendicular to the longitudinal direction of the core material 2 (the cross-section shown in Figure 1(b)), the lengths of the two buckling restraint members 3a and 3b in the opposing direction (the vertical direction in Figure 1(b)) are shorter than the lengths of the two buckling restraint members 3a and 3b in the direction perpendicular to the opposing direction (the horizontal direction in Figure 1(b)).

[0039] Furthermore, as shown in Figure 1(b), the core material 2 has a single-plate steel plate structure consisting of a flat core material intermediate portion 20 and connecting portions 21 provided at both ends thereof.

[0040] Here, the two connecting portions 21 may have reinforcing plates bonded to the upper and lower surfaces of the steel plate (base material of the core material 2) extending from the middle portion 20 of the core material. These reinforcing plates increase the strength of the connecting portion 21 compared to the strength of the middle portion 20 of the core material.

[0041] Furthermore, a rib 22 is joined to the connecting portion 21, and the cross-sectional shape is configured to be cross-shaped. In addition, bolt holes (not shown) for installation are formed in the connecting portion 21, which are used when installing the buckling-restrained brace 1 in a building.

[0042] Furthermore, notches 23 are formed on both sides of the core material intermediate portion 20, and the width of the core material intermediate portion 20 is narrower than the width of the connecting portion 21.

[0043] Furthermore, the strength of the core material's intermediate section 20 can be adjusted as needed by changing the width and longitudinal length of the notch 23. In other words, by appropriately selecting the dimensions of the notch 23 in the core material's intermediate section 20, the axial stiffness and yield strength of the core material 2 can be set to desired values.

[0044] Furthermore, two spacers 4 are placed in the space created by forming the notch 23 in the middle section 20 of the core material. These spacers 4 serve as displacement suppressing members that suppress displacement of the core material 2 in the longitudinal direction (left-right direction in Figure 1(b)).

[0045] By positioning this spacer 4 laterally along the longitudinal direction of the core material 2, even when the gap between the core material 2 and the inner wall of the buckling restraint member 1 (lateral space of the core material 2) is wide, the amount of displacement that the core material 2 can exert laterally along the longitudinal direction can be adjusted, making it possible to appropriately control the deformation and buckling of the core material 2 when subjected to axial compressive load.

[0046] Furthermore, the concrete 31 is a concrete block manufactured at a location separate from the channel shape material 30. Alternatively, mortar can be used instead of concrete 31.

[0047] Furthermore, the channel member 30 is formed from a steel plate and, as shown in Figure 1(b), consists of a bottom surface 300 and vertical surfaces 301 and 302 rising from both ends of the bottom surface 300, forming a roughly U-shape in cross-section. In the vertical direction, one vertical surface 302 is formed to be higher than the other vertical surface 301. Note that the channel member 30 located above in Figure 1(b) has the same shape.

[0048] As shown in Figure 1(a), multiple plate-shaped butyl rubber 5 are arranged on the upper and lower surfaces of the intermediate portion 20 of the core material 2.

[0049] This butyl rubber 5 is positioned between the upper and lower surfaces of the core material 2 and the core material opposing surfaces of the buckling restraint members 3a and 3b. When the core material 2 is sandwiched between the two buckling restraint members 3a and 3b, it deforms to ensure that the gap between the upper and lower surfaces of the core material 2 and the core material opposing surfaces of the buckling restraint members 3a and 3b becomes a predetermined amount. This butyl rubber is a clearance adjusting member.

[0050] In the following, the gap that falls within the ideal range will be referred to as the "target gap," and its predetermined amount will be referred to as the "target gap amount." In Figure 1(b), the position of the target gap is indicated by the symbol T. The vertical length of the space indicated by the symbol T corresponds to the portion of the target gap amount.

[0051] Furthermore, in the buckling-restrained brace 1 shown in Figure 1(a), ten butyl rubber pieces 5 of the same shape are arranged at regular intervals on the upper surface of the core material intermediate section 20. Although not shown, ten butyl rubber pieces 5 are also arranged at regular intervals on the bottom surface of the core material intermediate section 20, similar to the upper surface.

[0052] Here, the size and number of butyl rubber sheets 5 placed in the buckling-restrained brace 1 are appropriately set according to the target gap amount in the buckling-restrained brace 1 being manufactured. Furthermore, the manufacturing method A for the buckling-restrained brace to which the present invention is applied includes a clearance adjustment material setting step for determining the size and number of butyl rubber sheets 5 to be placed. Details of the clearance adjustment material setting step will be described later.

[0053] The buckling-restrained brace 1 described above can be made to have good quality as an earthquake-resistant or vibration-damping member by sandwiching the core material 2 from above and below with buckling-restraining members 3a and 3b, tightening them together, and then having the deformed butyl rubber 5 form the target gap T.

[0054] Next, a method for manufacturing a buckling-restrained brace will be described. The following description concerns manufacturing method A of a buckling-restrained brace, which is an example of a method for manufacturing a buckling-restrained member to which the present invention applies. In manufacturing method A of a buckling-restrained brace, the target gap amount can be adjusted easily and quickly compared to conventional manufacturing methods. Furthermore, the content of the present invention is not limited to what is described below, and the design can be modified as appropriate.

[0055] First, the manufacturing method A for the buckling-restrained brace involves preparing each component before manufacturing the buckling-restrained brace 1, and then tightening the core material 2 with two buckling-restraining members 3a and 3b to adjust it so that the target gap is formed.

[0056] In the following explanation, buckling-restrained brace 1 in the state where the target gap has not yet been formed will be referred to as "buckling-restrained brace 1a before adjustment (see Figure 2)". The amount of gap before reaching the target gap will be referred to as "the amount of gap during adjustment".

[0057] As shown in Figure 2, in manufacturing method A of the buckling-restrained brace, the buckling-restrained brace 1a before adjustment is placed across two base parts 6 installed on the floor. In addition, in manufacturing method A of the buckling-restrained brace, the amount of gap during adjustment is measured in real time using the measuring mechanism B (see Figure 2) when the core material 2 is tightened with the two buckling-restraining members 3a and 3b.

[0058] Here, the base portion 6 is the foundation for horizontally installing the buckling-restrained brace 1a relative to the floor surface. The base portion 6 also serves as a component that defines the height position of the buckling-restrained member 3b located below it.

[0059] Furthermore, the base section 6 is formed of H-beams. The members forming this base section 6 are not limited to H-beams, but can be appropriately selected as long as they are members that can be stably positioned by spanning the buckling-restrained brace 1a.

[0060] Furthermore, although this description shows a structure in which the buckling restraint member 3a is located above and the buckling restraint member 3b is located below in the vertical direction, the manufacturing method A of the buckling restraint brace is not limited to this, and the structure may be one in which the vertical positional relationship of the buckling restraint member 3a and the buckling restraint member 3b is reversed.

[0061] As shown in Figure 2, the measurement mechanism B has a measurement unit 7 and a data processing unit 8.

[0062] The measuring unit 7 also includes a mounting material 70, a laser displacement meter 71, and a magnet 72. The measuring unit 7 and the data processing unit 8 are connected via a cable 83 to enable the transmission and reception of signals.

[0063] Furthermore, the measuring unit 7 consists of four sets of a combination of a mounting material 70, a laser displacement meter 71, and a magnet 72, installed along the longitudinal direction of the buckling-restrained brace 1a.

[0064] Furthermore, the mounting member 70 is a component for installing the laser displacement meter 71 at a predetermined height position above the buckling-restrained brace 1a. The magnet 72 is a component for fixing the lower part of the mounting member 70 to one vertical side of the buckling-restrained member 3b.

[0065] Furthermore, the mounting member 70 has a roughly L-shape when viewed from a direction along the longitudinal direction of the buckling-restrained brace 1a, and laser displacement gauges 71 are attached to two locations on its upper part via brackets 700 (see Figure 3).

[0066] Furthermore, the laser displacement meter 71 is a measuring device that uses a laser to measure the distance from a predetermined height position to the upper surface of the buckling-restrained brace 1a.

[0067] More specifically, it is a measuring device placed on the base 6 that measures in real time the distance from a predetermined height position to the upper surface position of the buckling restraint member 3a (the distance indicated by the symbol h in Figure 3), which changes according to the amount of tightening applied to the buckling restraint members 3a and 3b.

[0068] Furthermore, the measured values ​​from the laser displacement meter 71 are transmitted to the data processing unit 8 via the cable 83.

[0069] Furthermore, on one mounting member 70, laser displacement meters 71 are provided at two different locations along the width direction of the buckling-restrained brace 1a, and measurements are taken at each installation location (see Figures 2 and 3).

[0070] Furthermore, four mounting members 70 are attached to the buckling-restrained brace 1a, and measurements are taken at a total of eight locations on the upper surface of the buckling-restrained member 3a using a laser displacement meter 71 (see Figure 2).

[0071] Here, the position for attaching the mounting member 70 via the magnet 72 is the vertical surface of the buckling restraint member (in this case, the buckling restraint member 3b) located below it in the vertical direction, and can be appropriately selected as long as it does not change according to the amount of tightening of the buckling restraint members 3a and 3b. In other words, it can be appropriately selected as long as the predetermined position (a fixed position in the vertical direction) described above can be guaranteed.

[0072] Furthermore, it is not always necessary for two laser displacement meters 71 to be attached to a single mounting member 7. For example, a structure in which one laser displacement meter 71 is installed at the center of the buckling-restrained brace 1a in the width direction can also be adopted. However, it is preferable to attach two laser displacement meters 71 to a single mounting member 7, as this makes it easier to ensure the accuracy of distance measurement by taking measurements with the laser displacement meter 71 at two different positions along the width direction of the buckling-restrained brace 1a and using the average of the two measured values.

[0073] Furthermore, it is not always necessary to adopt a structure in which four sets of the mounting material 70, laser displacement meter 71, and magnet 72 are installed along the longitudinal direction of the buckling-restrained brace 1a. For example, a structure in which only one set of the mounting material 70, laser displacement meter 71, and magnet 72 is installed for one buckling-restrained brace 1a can also be adopted. However, since many buckling-restrained braces 1a are long, exceeding 1600 mm in length, it is possible to manufacture the buckling-restrained brace 1 with higher precision by measuring with the laser displacement meter 71 at four different positions along its longitudinal direction and confirming whether the target gap amount is met at each position. For this reason, it is preferable to adopt a structure in which multiple sets of the mounting material 70, laser displacement meter 71, and magnet 72 are installed along the longitudinal direction of the buckling-restrained brace 1a. The number of sets can be appropriately changed according to the length of the buckling-restrained brace 1a.

[0074] As shown in Figure 2, the data processing unit 8 includes an amplifier unit 80, a switch box 81, and a PC terminal 82.

[0075] Here, the amplifier unit 80 is a device that outputs the measurement data measured by the laser displacement meter 71 as analog data. One amplifier unit 80 is connected to one laser displacement meter 71.

[0076] Furthermore, the switch box 81 is a device that converts analog data transmitted from the amplifier unit 80 into digital data. The switch box 81 consists of a multi-input data logger.

[0077] Furthermore, the digital data output by the switch box 81 is received by a multi-input data acquisition system (not shown), and the digital data is transmitted from this system to the PC terminal 82.

[0078] Furthermore, the PC terminal 82 is a terminal device equipped with measurement software for analyzing measurement values. The PC terminal 82 also has a display unit that shows the measurement results analyzed by the measurement software as numerical values ​​or waveforms.

[0079] Although not shown in the diagram, the buckling-restrained brace 1a has multiple clamps attached at regular intervals along its longitudinal direction, clamping its top and bottom surfaces from above and below. The number of clamps to be installed can be appropriately set according to the length of the buckling-restrained brace 1a.

[0080] This clamp tightens the two buckling restraint members 3a and 3b that sandwich the core material 2 from above and below until the amount of gap being adjusted falls within a certain range of values ​​that constitutes the target gap.

[0081] Next, we will explain the details of adjusting the target gap amount in manufacturing method A of the buckling-restrained brace.

[0082] In this method, the buckling-restrained brace 1a is tightened with a C-clamp while the amount of gap being adjusted is changed, and measurements are taken in real time using a laser displacement meter 71. The measured values ​​from the laser displacement meter 71 are processed via measurement software on a PC terminal 82 and expressed as the "height value (external dimensions)" of the buckling-restrained brace 1a in the vertical direction, which is displayed on the display unit of the PC terminal 82.

[0083] The height value (external dimension) of the buckling-restrained brace 1a referred to here corresponds, more specifically, to the distance from the upper surface of the buckling-restrained member 3a located above to the bottom surface of the buckling-restrained member 3b located below, as shown in Figure 4.

[0084] Furthermore, when calculating the height value of the buckling-restrained brace 1a (symbol H in Figure 4) through data processing by the measurement software, the measurement value of the laser displacement meter 71 (symbol h in Figure 4) is used along with the thickness value of the core material 2 in the vertical direction (symbol H2 in Figure 4) and the thickness value of the buckling-restrained member 3a (H in Figure 4). 3a ), the value of the thickness of the buckling restraint member 3b (H in Figure 4) 3b The thickness value of the plate-shaped butyl rubber 5 before it is compressed (crushed) by being squeezed from above and below is used.

[0085] Here, the thickness value of core material 2 is (H2), and the thickness value of buckling restraint member 3a is (H 3a ), the thickness value of the buckling restraint member 3b (H 3b The thickness value (H5) of the plate-shaped butyl rubber 5 before it is compressed from above and below and deformed (before it is crushed) is information obtained from the manufacturing specifications of each component and from measurements taken of the dimensions of each component during the preparation stage.

[0086] For example, given the values ​​before and after tightening the buckling restraint members 3a and 3b with a clamp under the following conditions, the method for calculating the gap amount (Δt) during adjustment and the height value (H) of the buckling restraint brace 1a is shown below.

[0087] (1. Initial value before tightening with a C-clamp) • Thickness value of buckling restraint member 3a (H3a ): 45mm • Thickness value of buckling restraint member 3b (H 3b ): 45mm • Core material 2 thickness value (H2): 10mm • Thickness value of butyl rubber 5 (H5): 2mm • Laser displacement meter measurement (h1): 30 mm Note that the thickness value (H5) of the butyl rubber 5 is the value in its initial state before deformation due to tightening with the clamp. Furthermore, the butyl rubber 5 is positioned between the upper and lower surfaces of the core material 2 and the core material-facing surfaces of the buckling restraint members 3a and 3b. In this initial state, the gap amount (Δt1) during adjustment is equal to the thickness of two layers of butyl rubber 5, which is "4mm (=2×2mm)". Furthermore, the height value (H1) of the buckling-restrained brace 1a is calculated as "104 mm (= 45 + 45 + 10 + 2 + 2)" from the thickness values ​​of each member.

[0088] From the initial state described above, the values ​​for the state after tightening the buckling restraint members 3a and 3b with a C-clamp and then stopping the tightening are as follows.

[0089] (2. Value after tightening with a C-clamp) • Laser displacement meter measurement (h2): 30.1 mm Here, the value of the gap amount (Δt2) during adjustment at this timing can be determined from the change in the measured value of the laser displacement meter. That is, the change in the measured value of the laser displacement meter is "h2-h1=0.1mm". Also, the value of the thickness of the buckling restraint member 3a (H 3a ), the thickness value of the buckling restraint member 3b (H 3b The thickness value (H2) of the core material 2 does not change with tightening. From this, it can be concluded that the butyl rubber 5 deformed due to the tightening of the clamp, and the gap amount decreased by 0.1 mm. As a result, the gap amount during adjustment (Δt2) can be calculated as "Δt1 - 0.1 mm = 3.9 mm". Furthermore, the height value (H2) of the buckling-restrained brace 1a can be calculated as "103.9 mm (= 104 - 0.1)" from the initial height value (H1) and the change in the gap amount.

[0090] The values ​​above are merely examples, but by using the change in the measured value of the laser displacement gauge, it is possible to calculate the "amount of gap during adjustment (Δt)" and the "height value (H) of the buckling-restrained brace 1a" at the moment each time the clamp is tightened.

[0091] Furthermore, in manufacturing method A for buckling-restrained braces, information regarding the laser displacement meter measurement is displayed in real time on the display unit of the PC terminal 82 (see Figure 5), allowing the operator to check the numerical values ​​and confirm whether the amount of gap being adjusted has fallen within the range of the target gap amount. In other words, it is possible to confirm whether a buckling-restrained brace 1 having the target height value (external dimensions) has been formed.

[0092] Here, Figure 5 shows an example of the display of the PC terminal 82's display unit, image 100. As shown in Figure 5, image 100 displays the height values ​​(range indicated by reference numeral 101) of the four buckling-restrained braces 1a. These four values ​​are derived from the average of the measurements taken by the two laser displacement meters 71 at each of the four mounting members 70 described above. In other words, the values ​​obtained from each mounting member 70 are shown.

[0093] Furthermore, Image 100 displays the height value of the buckling-restrained brace 1 that has the best value within the range of the target gap amount (the range indicated by reference numeral 102).

[0094] Furthermore, Image 100 also displays the height value of the buckling-restrained brace 1 reflecting the upper limit within the range of the target clearance (the range indicated by reference numeral 103), and the height value of the buckling-restrained brace 1 reflecting the lower limit within the range of the target clearance (the range indicated by reference numeral 104).

[0095] Image 100 also displays the judgment result (range indicated by symbol 105). When the height value 101 of each of the four buckling-restrained braces 1a falls within the range of "104 or greater, which reflects the lower limit of the target gap amount range, and 103 or less, which reflects the upper limit of the target gap amount range," the judgment result 105 displays "OK." If it exceeds the upper limit of the range, it displays "Tighten," and if it falls below the lower limit of the range, it displays "Loosen."

[0096] In other words, by simply looking at the display of the judgment result 105, the worker can easily confirm whether or not a buckling-restrained brace 1 with the target gap amount has been formed. Furthermore, by assigning workers to tasks such as tightening the clamp and checking the information in image 100, the work can be carried out efficiently.

[0097] Furthermore, we will explain how to set the target gap amount formed by the buckling-restrained brace mentioned above.

[0098] Here, one example of setting the target gap amount to be formed with a buckling-restrained brace is to use "10% of the core material thickness" as a reference. This is a method for setting the target gap amount that the inventors discovered through continuous manufacturing of buckling-restrained braces.

[0099] In this setting method, the best value for the target gap amount is determined by considering 10% of the core material thickness and the amount of shrinkage during welding. For example, if the core material thickness is 12 mm, then 10% of the core material thickness is 1.2 mm. Furthermore, when welding the overlapping lateral portions of buckling restraint members 3a and 3b after adjusting the gap amount, a value of 0.2 mm is set to account for the shrinkage of buckling restraint members 3a and 3b during the welding process.

[0100] Then, the best value for the target gap is determined by adding "10% of the core material thickness (1.2 mm) + shrinkage consideration value (0.2 mm)" to the sum of the thickness of the core material 2 before assembly and the thicknesses of the buckling restraint members 3a and 3b.

[0101] Furthermore, the upper and lower limits of the acceptable range for the target gap amount are set as follows. Here, the upper limit of the target gap amount range is set considering 15% of the core material thickness and the amount of shrinkage during welding. The lower limit of the target gap amount range is set considering 5% of the core material thickness and the amount of shrinkage during welding.

[0102] In this example of setting the target gap, the best value for the target gap and the acceptable upper and lower limits can be determined by using a fixed percentage value based on the thickness of the core material and a value that takes into account shrinkage during welding.

[0103] Another example of setting the target gap amount is as follows. Here, the lower limit of the gap on either the top or bottom side of the core material 2 is set based on Poisson's ratio (the ratio of longitudinal and transverse strains that occur when a load is applied to an object). If Poisson's ratio is 0.5, then the plastic strain a with respect to the thickness d in the middle part 20 of the core material 2 can be expressed as Δd≧d×a / 100×0.5.

[0104] For example, when the thickness t of the core material 2 in the middle section 20 is 40 mm and the plastic strain a of the core material 2 is approximately 3%, the lower limit of the gap Δt is approximately 0.6 mm. In this example, the upper limit of the gap can be appropriately set within a range that prevents localized plastic deformation of the middle section 6 of the core material 2 when subjected to axial compressive load.

[0105] Thus, the target gap amount (range) in a buckling-restrained brace can be set as appropriate.

[0106] Next, the clearance adjustment material setting step performed in the manufacturing method A of the buckling-restrained brace of the present invention will be described.

[0107] In buckling-restrained braces, various clearance adjustment materials, including the butyl rubber mentioned above, can be used to create a gap that falls within the target clearance range. However, with clearance adjustment materials, the amount of deformation when a load (such as a load from tightening with a C-clamp) is applied from above or below differs depending on the type and thickness of the material.

[0108] For example, even with butyl rubber of the same size (width and length), changing the thickness will change the amount of deformation under the same load. Therefore, in this invention, when selecting clearance adjustment material, the appropriate thickness, size, and number of pieces to be placed are predetermined, taking into account the compressive elastic stiffness. Compressive elastic stiffness, as used here, is a characteristic that indicates the degree of resistance to deformation when butyl rubber is compressed.

[0109] [Experiment to verify material properties to determine compressive elastic stiffness] First, we will conduct a verification experiment using butyl rubber, an example of a clearance adjustment material, as described below. Here, we will check the difference in displacement for each thickness in response to the load when the thickness of the butyl rubber is changed, and calculate the compressive elastic stiffness of the butyl rubber for each thickness.

[0110] Here, we conducted an experiment to verify the physical properties of butyl rubber using the loading device C shown in Figure 6. This loading device C is a device that measures the amount of displacement of the sample for each load applied to the sample while changing the load applied to the sample.

[0111] As shown in Figure 6, the loading device C includes a base 200, a top plate 201, a magnetic stand 202, a high-sensitivity displacement meter 203, and a compression load meter 204. Although not shown, the loading device C also includes a clamp, a switch box, and a data logger.

[0112] As shown in Figure 6, in the loading device C, a base 200 is placed on the floor, and a butyl rubber 5 of a certain thickness to be tested is placed between the top surface of the base 200 and the bottom surface of the top plate 201.

[0113] Figure 7(a) shows an image illustrating how the butyl rubber 5 is sandwiched between the top plate 201 and the base 200, with a load applied from the top plate 201 side.

[0114] Furthermore, in the loading device C, three high-sensitivity displacement gauges 203 are installed via a magnetic stand 202. The high-sensitivity displacement gauge 203 is a component that measures the amount of displacement (vertical displacement) at a measurement point on the top surface of the top plate 201 to which its lower end is in contact. Note that Figure 6 is a view from the front, so two high-sensitivity displacement gauges 203 and magnetic stand 202 are shown in the figure, but in the actual device, another set of high-sensitivity displacement gauges 203 and magnetic stand 202 are provided at the back of the page in Figure 6.

[0115] Furthermore, as shown in Figure 7(b), the high-sensitivity displacement meter 203 measures at three points that are equally spaced from the center R of the installed plate-shaped butyl rubber 5 in a plan view. Here, assuming that the top plate is flat, the equation of the plane passing through the three points is determined using the values ​​measured by the three high-sensitivity displacement meters 203. Then, the displacement amount at the center R of the butyl rubber 5 is calculated using this equation.

[0116] Furthermore, in the loading device C, a compression load meter 204 is installed in the center of the top surface of the top plate 201. A C-clamp is also installed above the compression load meter 204, and the load is applied to the top plate 201 from above via the C-clamp. The compression load meter 204 is a component that measures the compression load applied by the C-clamp, and is a CLA-type compression load meter.

[0117] Furthermore, the three high-sensitivity displacement gauges 203 and the compression load gauges 204 are each connected to a switch box. The switch box is a device that controls the on and off of each measuring instrument.

[0118] In addition, the switch box is connected to the data logger via a cable. The data logger is a device that converts analog data measured by the high-sensitivity displacement meter 203 and the compression load meter 204 into digital data. The analog data converted by the data logger is transmitted to a PC terminal or the like (not shown), enabling the analysis of the displacement amount and the load.

[0119] In this physical property test, plate-shaped butyl rubber 5 with a length and width of 100 mm × 100 mm was used, and butyl rubber 5 with thicknesses of 1 mm, 2 mm, and 5 mm were used as samples, respectively. Also, at the start of the experiment, a load of 0.3 kN was applied with a vice grip and the load was applied for 1 minute. After 1 minute, the load was increased by 0.1 kN, and the load was applied in that state for 1 minute. Thus, the load was increased in increments of 0.1 kN, and the increase in load and the measurement of the displacement amount were performed until displacement occurred in the experimental apparatus (spherical seat for the load meter). From the relationship between the change in load and the change in displacement amount, the compression elastic linear equation and the compression elastic rigidity (kN / mm / mm 2 ) were obtained. In this test, the same test was carried out 4 times for butyl rubber 5 with thicknesses of 1 mm and 5 mm, and the same test was carried out 2 times for butyl rubber 5 with a thickness of 2 mm. Also, the compression elastic linear equation for each sample was obtained by plotting the test results of multiple times and using the least squares method. The results of this test are shown in Table 1 below and Figures 8 to 11.

[0120]

Table 1

[0121] As shown in Figure 8 and Table Ⅰ, in the test of butyl rubber 5 with a thickness of 1 mm, a compression elastic linear equation of "y = 15.31x" was obtained, and the compression elastic rigidity (15.31×10 -4 kN / mm / mm 2 ) was obtained. Also, as shown in Figure 9 and Table Ⅰ, in the test of butyl rubber 5 with a thickness of 2 mm, a compression elastic linear equation of "y = 5.16x" was obtained, and the compression elastic rigidity (5.16×10 -4 kN / mm / mm 2 ) was obtained. Furthermore, as shown in Figure 10 and Table 1, in the test of butyl rubber 5 with a thickness of 5 mm, the compressive elastic linear equation "y = 1.841x" was obtained, and the compressive elastic stiffness (1.841 × 10) -4 kN / mm / mm 2 ) was required.

[0122] Furthermore, in this test, the compressive elastic stiffness of butyl rubber 5 with thicknesses of 1 mm, 2 mm, and 5 mm was calculated by interpolation using the test data as a reference, for butyl rubber 5 with thicknesses of 1.5 mm, 3 mm, and 4 mm. As shown in Figure 11, the compressive elastic stiffness is 1.5 mm (10.24 × 10 -4 kN / mm / mm 2 ), thickness 3mm (4.05 x 10 -4 kN / mm / mm 2 ) and thickness 4mm (2.95 x 10 -4 kN / mm / mm 2 ) was required.

[0123] Using the values ​​of compressive elastic stiffness for each thickness of butyl rubber obtained through the process described above, the thickness, size, and number of butyl rubber pieces to be placed on the top and bottom surfaces of the core material can be determined.

[0124] [Setting the size and number of clearance adjustment materials] Based on the following verification conditions, materials used, and calculations using each formula, the size of each butyl rubber sheet to be placed as clearance adjustment material and the number of sheets to be attached were determined.

[0125] (Confirmation conditions) • The butyl rubber 5 attached to the upper surface of the core material 2 contains the weight W of the buckling restraint member 3a located above it. r And assume that a tightening force P is acting on it due to the clamp. • The butyl rubber 5 attached to the bottom surface of the core material 2 has the weight W of the buckling restraint member 3a located on the upper side. r The total weight W of the core material 2 and the tightening force P applied by the clamp are assumed to be acting on it. • Calculate the area of ​​butyl rubber required to shrink (displace) the butyl rubber 5 in order to form the target gap, and then determine the size (width and length) of each sheet. The specific gravity of the steel material constituting the core material 2 and the channel members 30 of the buckling-restraining members 3a and 3b is 78 kN / m 3 The specific gravity of concrete (filler) 31 is 23 kN / mm². 2 Let's assume that. Figure 12 shows a calculation model illustrating the content of the above verification conditions.

[0126] (Conditions) [List of Sections] • Size of buckling restraint member • Width dimension of buckling restraint member (mm): br = 155.2 mm • Vertical dimension of buckling restraint member 1 (one side) (mm): h1 = 68 mm • Vertical dimension of buckling restraint member 2 (one side) (mm) h2 = 34 mm • Thickness of buckling-restraining member (mm): tr = 3.2 mm • Length of buckling restraint member (mm): Lr = 1605 mm Figure 13 shows the dimensions of the buckling restraint members at each position.

[0127] [Materials used] • Specific gravity of steel (kN / m³) 3 )G s = 78kN / m 3 • Specific gravity of concrete (filler) (kN / m³ 3 )G m = 23kN / mm 2 • Thickness of the butyl rubber sheet (on the top surface of the core material) (mm) u = 1.0 mm • Thickness of the butyl rubber sheet (on the underside of the core material) (mm) d = 1.0 mm This configuration was based on the assumption that butyl rubber with a thickness of 1 mm is used.

[0128] [Equipment used] • Shakoman: 5 units used • Total clamping force P = 25.0 kN

[0129] [Preparation calculation] First, as a preliminary calculation, we calculate the weights of the buckling restraint members 3a and 3b, and the weight of the core material 2. • Weight W of the steel pipe portion only of the buckling-restraining member s This is given by formula 1 below.

[0130] [Mathematics 1] JPEG0007883321000003.jpg27156 symbol W s : Weight of the steel pipe portion of the buckling restraint member only (kN) h1: Vertical dimension of buckling restraint member 1 (one side) (mm) h1 = 68 mm h2: Vertical dimension of buckling restraint member 2 (one side) (mm) h2 = 34 mm b r Width dimension (mm) of the buckling restraint member on one side r = 155.2 mm t r : Thickness of buckling restraint member (mm) t r = 3.2 mm L r Length of buckling restraint member (mm) L r = 1605mm G s Specific gravity of steel (kN / m 3 )G s = 78kN / m 3

[0131] • Weight of concrete (filler) only (W) m This is given by the following equation 2.

[0132] [Math 2] JPEG0007883321000004.jpg29159 symbol W m : Weight of concrete (filler) only (kN) h2: Vertical dimension of buckling restraint member 2 (one side) (mm) h2 = 34 mm t r : Thickness of buckling restraint member (mm) t r = 3.2 mm b r Width dimension (mm) of the buckling restraint member on one side r = 155.2 mm L r Length of buckling restraint member (mm) L r = 1605mm G m Specific gravity of concrete (filler) (kN / m³ 3 )G m = 23kN / m 3

[0133] • Weight W of the buckling-restrained member r This is given by the following equation 3.

[0134] [Math 3] JPEG0007883321000005.jpg3277 symbol W r : Weight of buckling-restraining member (kN) W s : Weight of the steel pipe portion of the buckling restraint member only (kN) W m : Weight of concrete (filler) only (kN)

[0135] • Weight of core material only (W) c When the core material has an end-expanded shape (see Figure 14), the following formula 4 is used. Figure 15 shows the positions of each dimension of the core material.

[0136] [Math 4] JPEG0007883321000006.jpg46167 symbol W c : Weight of core material only (kN) L B Brace length (mm) L B = 2351mm B J : Core material width at joint (mm) B J = 176mm L d Displacement absorption allowance (mm) L d = 23mm L r Length of buckling restraint member (mm) L r = 1605mm L j2 : Length of the end expansion part (mm) L j2 = 100 mm B c : Width of the core material (mm) B c = 132 mm t c : Thickness of the core material board (mm) t c = 12 mm G s : Specific gravity of the steel material (kN / m 3) G s = 78 kN / m 3

[0137] · Weight W of the rib rib is obtained by the following formula 5. In addition, Fig. 16 shows the positions of the dimensions of the core material 2, Fig. 17 shows the sectional symbol diagram of the joint part of the core material and the rib, and Fig. 18 shows the sectional symbol diagram of the core material reinforcement part. Note that the core material reinforcement part means the range where the rib is welded to the core material for reinforcement.

[0138] [Formula 5] JPEG0007883321000007.jpg52156 symbol W rib : Weight of the rib (kN) L in : Penetration length of the rib (mm) L in = 177 mm L d : Displacement absorption allowance (mm) L d = 23 mm L j : Length on the brace joint side (mm) L j = 350 mm H rib : Rib height at the joint (mm) H rib = 170 mm t c : Thickness of the core material board (mm) t c = 12 mm L j2 ​​​​​​​​​​​​​t rib Rib plate thickness (mm) t rib = 12mm G s Specific gravity of steel (kN / m 3 )G s = 78kN / m 3

[0139] The total weight W of the core material is calculated using the following formula 6.

[0140] [Number 6] JPEG0007883321000008.jpg3073 symbol W: Total weight of the core material (kN) W c : Weight of core material only (kN) W rib : Rib weight (kN)

[0141] [Calculations for butyl rubber] Based on the preparatory calculations described above, the area to which the butyl rubber was applied was calculated, and the size of each butyl rubber sheet was determined.

[0142] The amount of shrinkage Σδ of the butyl rubber required to secure the target gap is given by the following formula 7. The target gap is set to 10% of the core material. Also, the thickness of the butyl rubber sheet (t) is shown in Table 2 below. b )(mm) and the standard width of butyl rubber (b s )(mm) and compressive elastic stiffness (kN / mm / mm) for each thickness 2 This shows the values ​​of compressive elastic stiffness (kN / mm / mm) for each thickness in Table 2. 2 The value of ) is the value obtained in the physical property verification experiment of butyl rubber described above. Also, the standard width of butyl rubber (b s )(mm) refers to the width specified in the raw material specifications.

[0143] [Number 7] JPEG0007883321000009.jpg29101 symbol Σδ: Amount of shrinkage of butyl rubber required to secure the target gap (mm) t u :Butyl rubber sheet thickness (mm) (on the top surface of the core material)u = 1.0 mm t d :Butyl rubber sheet thickness (mm) (on the underside of the core material) d = 1.0 mm t c : Core material plate thickness (mm) t c = 12mm

[0144] [Table 2]

[0145] • Butyl rubber bonding area S b This is calculated using the following formula 8. Figure 19 shows an illustrative diagram for calculating the butyl rubber application area. The butyl rubber application area S calculated here is... b This refers to the area of ​​butyl rubber applied to either the upper or lower surface (one side) of the core material.

[0146] [Number 8] JPEG0007883321000011.jpg41127 symbol S b : Butyl rubber application area (mm²) 2 ) W r : Weight of buckling-restraining member (kN) P: Total clamping force of the clamp (kN) P = 25kN u K i : Compressive elastic stiffness of butyl rubber (on the upper surface of the core material) (kN / mm / mm 2 ) u K i = 15.31 × 10 ?4 kN / mm / mm 2 W: Total weight of the core material (kN) d K i : Compressive elastic stiffness of butyl rubber (on the underside of the core material) (kN / mm / mm 2 ) d K i = 15.31 × 10 ?4 kN / mm / mm 2 Σδ: Amount of shrinkage of butyl rubber required to secure the target gap (mm)

[0147] The required area width x of the butyl rubber is calculated using the following formula 9. Note that the required area width x of the butyl rubber calculated here is the required area width of the butyl rubber on either the top or bottom surface (one side) of the core material.

[0148] [Number 9] JPEG0007883321000012.jpg4444 symbol x: Required surface area width of butyl rubber (mm) S b : Butyl rubber application area (mm²) 2 ) b s : Standard width of butyl rubber (mm) b s = 100mm

[0149] • Size b per sheet of butyl rubber x This is calculated using the following formula 10. Note that the calculation here assumes that 14 sheets of butyl rubber are placed on either the top or bottom surface (one side) of the core material (see Figure 20). From the calculation using formula 10 below, it became clear that the size of each 1mm thick butyl rubber sheet is a standard width of 100mm and a required area width of 30mm. By placing 14 of these sheets on the top (or bottom) surface of the core material, an appropriate target gap can be formed.

[0150] [Number 10] JPEG0007883321000013.jpg4453 symbol b x Size of one butyl rubber sheet (mm) x: Required surface area width of butyl rubber (mm) n: Number of sheets with butyl rubber attached to one side n=14

[0151] The contact area Sj between the core material and the concrete (filler) is given by the following formula 11. Figure 21 shows the range of the contact area between the core material and the concrete (filler).

[0152] [Number 11] JPEG0007883321000014.jpg2394 symbol S j : Contact area (mm²) between the core material and concrete (filler) 2 ) L r Length of buckling restraint member (mm) L r = 1605mm B c : Core material width (mm) B c = 132mm L in Rib penetration length (mm) L in = 177mm t rib : Rib plate thickness (mm) t rib = 12mm

[0153] The minimum surface area of ​​the butyl rubber must satisfy not only equation 8 above, but also equation 12 below. The conditions in equation 12 below are based on past manufacturing experience.

[0154] [Number 12] JPEG0007883321000015.jpg3075 symbol S b : Butyl rubber application area (mm²) 2 ) S j : Contact area (mm²) between the core material and concrete (filler) 2 )

[0155] Based on the above calculations, the size of each butyl rubber sheet (standard width × required area width) is 100 mm × 30 mm, the thickness of the butyl rubber sheet is 1 mm, and the number of sheets to be attached to one side can be set to 14. Figure 22 shows an illustrative diagram of the size of each butyl rubber sheet.

[0156] Thus, in the manufacturing method A of a buckling-restrained brace to which the present invention is applied, the compressive elastic stiffness value that changes with each thickness of the butyl rubber used as a clearance adjustment material can be determined, and based on this, the size and number of butyl rubber pieces required to form the target gap can be determined.

[0157] Furthermore, while the above describes the detailed examination of butyl rubber, the clearance adjustment material setting process in this invention can be applied to other types of clearance adjustment materials in a similar manner to determine the size and number of pieces required to form the target gap.

[0158] As described above, the method for manufacturing buckling-restrained building materials according to the present invention is a method that allows for the efficient manufacture of buckling-restrained building materials having an appropriate gap by adjusting the amount of the gap between the core material and the core material-facing surface of the buckling-restraining member.

[0159] The terms and expressions used in this specification and claims are for illustrative purposes only and are not limiting in any way, and there is no intention to exclude terms or expressions equivalent to the features and parts thereof described herein and in the claims. Furthermore, it goes without saying that various modifications are possible within the scope of the technical concept of the present invention. [Explanation of Symbols]

[0160] 1. Buckling-restrained brace 1a Buckling-restrained brace before adjustment 2 Core material 20 Core material middle section 21 Connecting part 22 Ribs 23 Notch 3a Buckling restraint member 3b Buckling restraint member 30 channel profiles 300 base 301 Elevation 302 Elevation 31 Concrete 4 Spacers 5. Butyl rubber B Measuring mechanism 6. Base 7 Measuring part 70 Mounting materials 71 Laser displacement meter 72 Magnets 700 bracket 8. Data Processing Unit 80 Amplifier Unit 81 Switchbox 82 PC terminals 83 Cables C Loading device 200 base 201 Tabletop 202 Magnetic Stand 203 High-sensitivity displacement meter 204 Compression load meter

Claims

1. A method for manufacturing a buckling-restrained building material comprising a core material, two buckling-restraining members that sandwich the core material, and a clearance adjustment member which is an elastic body disposed between the core material and the core material-facing surfaces of the two buckling-restraining members to secure a gap, The system includes a clearance adjustment step in which the core material and the clearance adjustment material are tightened with two buckling restraint members, and while changing the amount of the gap, the distance between the outer surfaces of the buckling restraint members along the clamping direction of the core material is measured in real time, and the buckling restraint members are tightened until the distance between the outer surfaces falls within a predetermined target range. A method for manufacturing buckling-restrained building materials.

2. Based on the measured distance from a measuring unit located at a predetermined position to the outer surface of one of the buckling restraint members, the distance between the outer surfaces is calculated. A method for manufacturing a buckling-restrained building material according to claim 1.

3. The other buckling restraint member is placed at a predetermined height, and the first buckling restraint member is placed on top of it. A mounting member is attached to the other buckling restraint member, and the measuring unit is positioned above the outer circumferential surface of the first buckling restraint member via the mounting member. A method for manufacturing a buckling-restrained building material according to claim 2.

4. Multiple measuring units are provided along the longitudinal direction of the buckling restraint member. A method for manufacturing a buckling-restrained building material according to claim 2 or claim 3.

5. The measurement unit is a laser displacement meter. A method for manufacturing a buckling-restrained building material according to claim 2 or claim 3.

6. The aforementioned clearance adjustment material has a clearance adjustment material setting step, which sets the size and number of clearance adjustment materials to be placed based on the compressive elastic stiffness, which is a value that differs depending on the thickness and is obtained from the relationship between the load applied in the thickness direction and the amount of displacement in the thickness direction. A method for manufacturing a buckling-restrained building material according to claim 1, claim 2, or claim 3.

7. The clearance adjustment material is butyl rubber. A method for manufacturing a buckling-restrained building material according to claim 1, claim 2, or claim 3.

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