Axial connecting structure with energy dissipation function for multi-ribbed composite wallboard

Abstract

The invention relates to the technical field of building wall structures, in particular to an axial connecting structure with an energy dissipation function of a multi-ribbed composite wallboard, which adopts a dry-type, detachable and axial semi-rigid connecting form to improve the anti-seismic property and simplify the assembly construction. According to the structure, an internal embedded part and an external connecting part are arranged in an upper connecting wall body and a lower connecting wall body and are matched to form axial semi-rigid sliding connection. The energy dissipation component comprises an SMA rib, an SMA steel plate and an annular spring. The SMA rib is mainly composed of nickel-titanium shape memory alloy, participates in energy dissipation only when pulled and has the self-resetting capacity. 60Si2MnA spring steel is adopted in the pulling-pressing two-way independent energy consumption mechanism, participates in energy consumption only when being pressed and has the self-resetting capacity, and pulling-pressing two-way independent energy consumption is achieved. The structure is easy and convenient to assemble and high in standardization degree, bidirectional self-resetting energy dissipation and replaceability are achieved, earthquake energy can be effectively absorbed, residual deformation is reduced, and node reliability and maintenance efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building wall structure, and specifically relates to an axial connection structure with energy dissipation function for a multi-rib composite wall panel. BACKGROUND

[0002] As a new type of prefabricated building structure system, the multi-rib composite wall panel has the advantages of light weight, good thermal insulation performance, high construction efficiency, etc., and is widely used in prefabricated buildings. However, the existing connection structure of the multi-rib composite wall panel mostly adopts traditional rigid connection methods such as steel sleeve connection, bolt connection or welding connection, which can ensure the connection strength, but has significant technical defects: first, the deformation coordination ability is poor under the action of earthquake, and stress concentration and brittle failure easily occur at the connection part; second, there is no effective energy dissipation mechanism, and the earthquake input energy cannot be dissipated through plastic deformation, resulting in amplification of seismic response; third, the axial connection has insufficient adaptability under complex stress states such as tension, compression and shear. Under the condition of strong earthquake, the structure will have certain vertical deformation, and axial energy dissipation as an effective anti-seismic technology can dissipate seismic energy through axial plastic deformation, realize stress redistribution and control residual deformation, which is of great significance to improve the seismic performance of prefabricated structures. Patent CN109594687A proposes a vertical shear wall joint, which pre-buries steel plates outside the vertical steel bars of the two side wall panels, and pre-leaves grouting holes on the steel plates. After the butt welding of the panels, high-strength grouting is poured into the steel plate grouting holes to form a whole, which saves the construction steps such as formwork, binding and post-poured concrete, and has simple process and low positioning accuracy requirement. However, maintenance is required after grouting, which still belongs to wet connection, and the upper and lower steel plates need to be welded on site, which is prone to stress concentration and has poor ductility, and the joint cannot be disassembled after solidification. Patent CN111749351B discloses a prefabricated shear wall self-resetting energy dissipation connecting device, which arranges prestressed steel bars in the central axis of the upper and lower wall panels to pull the wall panels together; replaceable low-yield-point steel plates are arranged at the four corners of the wall panels and connected with the wall panels through bolt rods. The steel plates slide and yield to dissipate energy during an earthquake, and automatically reset after the earthquake using the prestress and self-weight. However, when the prestress is applied, the tension needs to be synchronized at one time, the hole error causes large friction loss, and the jacks are difficult to position due to the narrow space at the corners, which significantly increases the precision, loss and operation cost. In addition, the joint is not suitable for energy dissipation when the structure produces plastic deformation under strong earthquake conditions.

[0003] Therefore, it is necessary to develop an axial connection structure with energy dissipation function for a multi-rib composite wall panel to solve the problems of insufficient connection reliability and limited seismic performance in the prior art, and meet the technical needs of high-quality development of prefabricated buildings. The present application is based on this demand and proposes an innovative axial connection structure to achieve better seismic effect and structural stability through optimized connection design. SUMMARY

[0004] The application aims to provide an axial connecting structure of a multi-ribbed composite wall panel with energy dissipation, which adopts a dry connecting form, is simple to construct, can be disassembled, and can improve construction efficiency and the anti-seismic performance of the wall panel.

[0005] The application provides an axial energy dissipation connecting structure of a multi-ribbed composite wall panel, which adopts a dry, disassembled, axial semi-rigid connecting form, simplifies construction, is convenient to maintain and replace, and significantly improves the anti-seismic performance.

[0006] The connecting structure comprises a connecting wall body, an internal embedded part, an external connecting part, and an energy dissipation component. The connecting wall body comprises an upper wall and a lower wall, and a rubber pad is arranged on the contact surface of the upper wall and the lower wall to buffer and reduce shock. A vertical through rib beam hole coaxial with the rib beam is arranged in the rib beam at the contact position of the upper wall and the lower wall, so that the energy dissipation component can be arranged through the hole.

[0007] The internal embedded part comprises a T-shaped threaded sleeve, a tensioning screw rod, and a limiting steel bar. Threaded ends are arranged at both ends of the rib column longitudinal reinforcement in the rib column of the upper wall and the lower wall, and part of the rib column longitudinal reinforcement of the lower wall extends out of the wall body to form a limiting rib column longitudinal reinforcement. One end of the T-shaped threaded sleeve is connected with the threaded end of the rib column longitudinal reinforcement, and the tensioning screw rod penetrates through a plurality of T-shaped threaded sleeves and extends out of the side surface of the wall body at both ends, as the extended end of external connection. The limiting steel bar is only embedded in the lower wall, one end of which is threaded and extends out of the wall body, and is used for limiting the lateral position of the annular spring together with the limiting rib column longitudinal reinforcement.

[0008] The external connecting part comprises a long-hole steel plate, a double-hole steel plate, a four-hole steel plate, a I-shaped limiting part, and a nut. The long-hole steel plate is provided with a round hole and a long hole, and the round hole is matched with the extended end of the tensioning screw rod of the lower wall and the long hole is matched with the extended end of the tensioning screw rod of the upper wall during installation. In the locked state of the nut, the corresponding tensioning screw rod of the upper wall can produce a controlled vertical displacement in the long hole, so as to realize the axial semi-rigid sliding connection of the upper wall relative to the lower wall.

[0009] The energy dissipation component comprises an SMA rod, an SMA steel plate, and an annular spring. The SMA rod is a rod-shaped component with thick ends and a thin middle part, and the ends are threaded and arranged through the corresponding rib beam holes of the upper wall and the lower wall during installation. The SMA steel plate is concave, and the upper end is provided with a round hole and the lower end is provided with a cross-shaped slot. During installation, the round hole faces upward and the cross-shaped slot faces downward, and the I-shaped limiting part is filled in the cross-shaped slot to limit the out-of-plane displacement. The double-hole steel plate and the nut are used for fixing and pressing the SMA rod and the SMA steel plate. The SMA rod and the SMA steel plate are mainly made of nickel-titanium shape memory alloy, and only participate in energy dissipation when subjected to tension and have self-resetting capability. The annular spring is made of 60Si2MnA spring steel, and only participates in energy dissipation when subjected to pressure and has self-resetting capability. The four-hole steel plates on the upper and lower sides of the annular spring are used as pressure bearing pads, and the holes thereof are respectively arranged through the limiting rib column longitudinal reinforcement and the limiting steel bar to realize the lateral limiting of the annular spring.

[0010] Preferably, the two ends of the SMA steel plate pass through the two threaded ends of the same SMA tendon respectively, and after the SMA tendons on both sides of the wall are in place, the double-hole steel plate and the nut are first installed on the upper wall side and pressed tightly, then the I-shaped limiting piece is filled into the cross-shaped groove of the SMA steel plate, and then the double-hole steel plate and the nut are installed on the lower wall side to complete the pressing and fixing.

[0011] Preferably, before installing the four-hole steel plate on the top of the ring spring, a PVC pipe is inserted in the center of the ring spring and the center concrete is poured, so that the ring spring reaches the design compression displacement limit value and bears pressure together with the center concrete, thereby improving the bearing and stability of the compression energy dissipation.

[0012] The beneficial effects brought by the present application are:

[0013] 1. The bidirectional self-resetting energy dissipation mechanism, the SMA tendon and the SMA steel plate have good shape memory effect and superelasticity, and play an important role in tensile energy dissipation; the ring spring has unique elastic properties and energy conversion capacity, and plays an important role in compression energy dissipation; the two are independent of each other and can coordinate and cooperate to participate in structural energy dissipation at the same time, and the post-earthquake deformation can be automatically restored, which has strong adaptability to complex stress states such as tension, compression and shear of the axial connection structure, so that the axial connection structure of the present application has good energy dissipation effect under different seismic conditions.

[0014] 2. The connection structure adopts prefabricated design, which is simple to assemble on site, reduces complex on-site welding and grouting process, has high construction efficiency and quality is easy to control. The bidirectional energy dissipation mechanism reduces the requirements on the main structure, can appropriately reduce the reinforcement ratio of the wall panel, and reduces the material consumption of auxiliary support and reinforcement measures. The energy dissipation component can be replaced separately, the maintenance cost is low, the post-earthquake repair is simple, the whole life cycle economy is remarkable, and at the same time, the standardization degree is high, which is convenient for popularization and application and quality management.

[0015] 3. The connection structure adopts factory prefabricated production, the quality control is more strict, the production efficiency is high, the occupation of land resources and the pollution to the environment are reduced. The factory production mode realizes the precise configuration and recycling of materials, reduces the generation of construction waste, reduces the energy consumption and carbon emission of on-site construction. The standardized design of the connecting component facilitates the mass production and quality control, the energy dissipation component can be recycled, which meets the requirements of green building and sustainable development, promotes the industrialization process of building, and provides important technical support for the green development of prefabricated building. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic view of an axial connection structure with energy dissipation function of a multi-rib composite wall panel;

[0017] Figure 2 It is Figure 1 a local enlargementFigure 1-1 , which shows the structure and connection of the connection point in detail;

[0018] Figure 3 The schematic diagram is provided for the rib column longitudinal reinforcement and the embedded part, and the position of the rib column longitudinal reinforcement and the embedded part is shown;

[0019] Figure 4 The schematic diagram is provided for the rib column longitudinal reinforcement and the embedded part, and the position of the rib column longitudinal reinforcement and the embedded part is shown; Figure 3 , which shows the structure and connection of the connection point in detail; Figure 2-2 , which shows the structure and connection of the connection point in detail;

[0020] Figure 5 The schematic diagram is provided for the rib column longitudinal reinforcement and the embedded part, and the position of the rib column longitudinal reinforcement and the embedded part is shown; Figure 3

[0021] Figure 6 The schematic diagram is provided for the rib column longitudinal reinforcement and the embedded part, and the position of the rib column longitudinal reinforcement and the embedded part is shown; Figure 3

[0022] Figure 7 The schematic diagram is provided for the rib column longitudinal reinforcement and the embedded part, and the position of the rib column longitudinal reinforcement and the embedded part is shown;

[0023] Figure 8 The schematic diagram is provided for the rib column longitudinal reinforcement and the embedded part, and the position of the rib column longitudinal reinforcement and the embedded part is shown;

[0024] Code in the drawing: 1-connection wall; 11-upper wall; 12-lower wall; 121-limiting rib column longitudinal reinforcement; 101-rib column longitudinal reinforcement; 102-rubber cushion layer; 103-rib beam round hole; 104-stirrup; 2-internal embedded part; 21-T-shaped threaded sleeve; 22-pull screw; 23-limiting reinforcement; 3-external connecting part; 31-long round hole steel plate; 311-long round hole; 32-double hole steel plate; 33-four-hole steel plate; 34-I-shaped iron; 35-nut; 4-energy dissipation component; 41-SMA reinforcement; 42-SMA steel plate; 43-ring spring; 431-outer ring; 432-inner ring; 433-PVC pipe; 434-central concrete; DETAILED DESCRIPTION

[0025] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0026] As Figures 1 to 8 ​​The application discloses an axial connecting structure with energy consumption effect of a multi-rib composite wallboard.

[0027] Specifically, the connecting wall body 1 can be divided into an upper wall 11 and a lower wall 12 according to the relative position during connection, and a rubber pad layer 102 is arranged on the contact surface of the upper wall 11 and the lower wall 12, so as to play a buffering role and slow down vibration energy.

[0028] Rib-column longitudinal reinforcement 101 and rib-beam round holes 103 are arranged in the upper wall 11 and the lower wall 12, the rib-column longitudinal reinforcement 101 is provided with threads at both ends, and part of the rib-column longitudinal reinforcement 101 arranged in the lower wall 12 is arranged to protrude from the wall body at a connecting point and serves as limiting rib-column longitudinal reinforcement 121.

[0029] Specifically, the rib-beam round holes 103 arranged in the upper wall 11 and the lower wall 12 penetrate the side rib-beam, and the centers of the rib-beam round holes 103 in the upper wall 11 and the lower wall 12 are on the same straight line.

[0030] Specifically, the internal pre-embedded part 2 comprises a T-shaped threaded sleeve 21, a tensioning screw rod 22 and limiting steel bars 23, wherein the T-shaped threaded sleeve 21 and the tensioning screw rod 22 are pre-embedded in the upper wall 11 and the lower wall 12, and the limiting steel bars 23 are only pre-embedded in the lower wall 12.

[0031] The T-shaped threaded sleeve 21 is internally provided with threads, and one end is connected with the threaded end of the rib-column longitudinal reinforcement 101; the tensioning screw rod 22 penetrates through through-holes of a plurality of T-shaped threaded sleeves 21 along the thickness direction of the wall body and protrudes from both sides of the wall body as protruding ends.

[0032] Specifically, the tensioning screw rod 22 needs to penetrate through the through-holes of at least two T-shaped threaded sleeves 21 and protrude from both sides of the wall body by a distance as the protruding ends; the protruding ends of the tensioning screw rod 22 are perpendicular to the side surface of the wall body.

[0033] One end of the limiting steel bar 23 protrudes from the surface of the wall body by a certain distance and is provided with threads, and the other end is pre-embedded in the wall body; the pre-embedded length of the limiting steel bar 23 is greater than the protruding length. In the specification, the “limiting longitudinal reinforcement” should be expressed as “limiting steel bar”, which is distinguished from the “limiting rib-column longitudinal reinforcement 121”.

[0034] The cross-sectional dimensions of the rib-column longitudinal reinforcement 101, the limiting rib-column longitudinal reinforcement 121 and the limiting steel bar 23 are the same, and all are hot-rolled ribbed HRB400 steel bars; the stirrup 104 is a hot-rolled round HPB300 steel bar; the materials of the T-shaped threaded sleeve 21 and the tensioning screw rod 22 are Q235 ordinary carbon steel.

[0035] When fabricating the connecting wall 1, molds with pre-drilled holes should be installed in the ribs at the wall connection points according to the design requirements, so that the rib round holes 103 can be pre-drilled during concrete pouring. Additionally, a rubber pad 102, made of natural rubber, should be installed on the contact surface between the upper wall 11 and the lower wall 12 according to the design requirements. When tying the steel frame of the lower wall 12, the limiting reinforcing bars 23, the longitudinal reinforcing bars 101, and the longitudinal reinforcing bars 121 of the limiting ribs should be tied together according to the design.

[0036] Specifically, the external connector 3 includes an oblong hole steel plate 31, a double-hole steel plate 32, a four-hole steel plate 33, an I-beam 34, and a nut 35, all made of Q235 ordinary carbon steel. The oblong hole steel plate 31 has one round hole and one oblong hole 311, with the radius of the rounded corner of the oblong hole 311 being the same as the radius of the round hole. The double-hole steel plate 32 has two round holes. The four-hole steel plate 33 has four round holes at its four corners.

[0037] When the elongated hole steel plate 31 is installed, the round hole faces down and the elongated hole 311 faces up, so that the round hole passes through the protruding end of the tie rod 22 of the lower wall 12 and the elongated hole 311 passes through the protruding end of the tie rod 22 of the upper wall 11. After the nut 35 is tightened, the tie rod 22 on the side of the upper wall 11 can generate controlled vertical displacement in the elongated hole 311, and the upper wall 11 obtains axial semi-rigid sliding ability relative to the lower wall 12.

[0038] Specifically, the energy-dissipating component 4 includes an SMA rib 41, an SMA steel plate 42, and a ring spring 43; wherein the SMA rib 41 and the SMA steel plate 42 are mainly made of nickel-titanium alloy shape memory alloy, which has good shape memory effect and superelasticity, can withstand large inelastic strain, and can recover its original shape by heating or unloading, and participate in energy dissipation when under tension; the ring spring 43 is made of 60Si2MnA spring steel, and participates in energy dissipation when under compression.

[0039] Specifically, SMA rib 41 is a rod-shaped shape memory alloy with a diameter of 10-20mm and threads at both ends. The diameter of the threaded end is 1.2-1.5 times that of the unthreaded end in the middle, so that when deformation occurs and energy is consumed, the deformation occurs in the middle first, so as to ensure a stable connection at both ends.

[0040] Specifically, the SMA steel plate 42 is concave, with a round hole at one end and a cross-shaped groove at the other end for easy installation. Its thickness is the same as that of the I-beam. During installation, the end with the cross-shaped groove should face down and the end with the round hole should face up. The I-beam 34 should be filled into the cross-shaped groove to limit the out-of-plane displacement of the SMA steel plate 42 with the cross-shaped groove.

[0041] The annular spring 43 is composed of an outer ring 431 with an inner taper and an inner ring 432. When the end surface is subjected to axial pressure, the inner and outer ring contact surfaces bear normal pressure and slide relative to each other, the outer ring diameter tends to increase, the inner ring diameter tends to decrease, and the annular spring is axially compressed. The contact surface friction is converted into heat energy to dissipate the input energy. After unloading, the inner and outer ring diameters return to the initial state, realizing compression energy dissipation and self-resetting.

[0042] The specific steps for axially splicing the upper wall 11 and the lower wall 12 are as follows:

[0043] During installation, the bottom four-hole steel plate 33, the annular spring 43, and the top four-hole steel plate 33 are installed in sequence at the corresponding positions of the lower wall 12. The four holes of the four-hole steel plate 33 pass through the limiting rib column longitudinal reinforcement 121 and the limiting steel bar 23, and are locked by the nut 35, so that the four-hole steel plate 33 is in close contact with the annular spring 43 to bear pressure, and the lateral displacement of the annular spring 43 is limited by the limiting rib column longitudinal reinforcement 121 and the limiting steel bar 23. If necessary, a PVC pipe is inserted into the center of the annular spring before installation of the top four-hole steel plate, and the center concrete is poured, so that the joint can bear pressure together after reaching the designed compression displacement limit.

[0044] Subsequently, the SMA bar 41 is inserted into the rib beam circular hole 103 of the lower wall 12 and kept vertical, the upper wall 11 is hoisted to align the rib beam circular holes 103 of the upper and lower walls, the long circular hole steel plate 31 and the nut 35 are installed, and the semi-rigid connection locking of the tension rod 22 is completed. Then, the circular hole of the SMA steel plate 42 is aligned with the rib beam circular hole 103 of the upper wall 11, the SMA bar 41 passes through the circular hole of the SMA steel plate 42, and the cross-shaped groove of the SMA steel plate 42 is sleeved on the SMA bar 41 on the side of the lower wall 12. The double-hole steel plate 32 and the nut 35 are installed in sequence on both sides of the wall body to compress and fix, and the I-shaped limiting member 34 is filled into the cross-shaped groove of the SMA steel plate 42 on the lower wall side to limit the out-of-plane displacement thereof. After all the nodes are installed, the axial splicing of the upper wall 11 and the lower wall 12 is completed.

[0045] Finally, the circular hole of the SMA steel plate 42 is aligned with the rib beam circular hole 103 of the upper wall 11, and the SMA bar 41 passes through the circular hole on the SMA steel plate 42. The cross-shaped groove of the SMA steel plate 42 passes through part of the SMA bar 41 in the lower wall 12. After the SMA steel plates 42 on both sides of the wall body are placed, the double-hole steel plate 32 is first installed to the specified position of the upper wall 11, so that the circular hole of the double-hole steel plate 32 passes through the threaded ends of the two SMA bars 41 in the same direction, and the nut 35 is installed to fix and compress. Then, the I-shaped iron 34 is filled into the cross-shaped groove of the SMA steel plate 42, and the double-hole steel plate 32 is installed to the specified position of the lower wall 12. After all the nodes are installed, the axial splicing of the upper wall 11 and the lower wall 12 is completed.

[0046] The foregoing merely illustrates some exemplary embodiments of the application, and no doubt numerous modifications and alterations thereto will be apparent to those skilled in the art. Accordingly, the above description is intended for purposes of illustration only and should not be construed as limiting the scope of the application.

Claims

1. An axial connection structure for a ribbed composite wall panel with energy dissipation function, comprising an upper wall and a lower wall, the contact surfaces of which are provided with rubber pads; the ribs of the upper and lower walls are provided with coaxial vertically penetrating rib beam circular holes at the contact positions; T-shaped threaded sleeves connected to the threaded ends of the longitudinal reinforcement of the ribs are pre-embedded in the ribs of the upper and lower walls, and tie rods pass through the T-shaped threaded sleeves with both ends extending out of the wall side; a steel plate with an elongated hole and a nut are provided on the outer side of the wall, the circular hole of the elongated hole of the steel plate cooperating with the tie rod at the protruding end of the lower wall, and the elongated hole cooperating with the tie rod at the protruding end of the upper wall, thereby allowing the upper wall to generate controlled vertical displacement relative to the lower wall in the locked state to form Axial semi-rigid dry detachable connection; threaded limiting steel bars are pre-embedded at the protruding ends in the lower wall, and the longitudinal reinforcement of the lower wall ribs extends out of the wall to form limiting rib longitudinal reinforcements; a ring spring clamped between the limiting steel bars and the limiting rib longitudinal reinforcements is installed between the limiting steel bars and the limiting rib longitudinal reinforcements to withstand axial pressure and limit their lateral displacement; SMA reinforcements and mating SMA steel plates are installed through the round holes of the corresponding rib beams of the upper and lower walls, with round holes at the upper end and cross-shaped grooves at the lower end, and I-shaped limiting members are inserted into the cross-shaped grooves to limit their out-of-plane displacement; the SMA reinforcements and SMA steel plates are pressed and fixed on both sides of the wall by double-hole steel plates and nuts; wherein, SMA ribs and SMA steel plates participate in energy dissipation and have self-resetting ability when under tension, while ring springs participate in energy dissipation and have self-resetting ability when under compression.

2. The structure according to claim 1, wherein, The steel plate with an oblong hole has a round hole and an oblong hole. During installation, the round hole engages with the protruding end of the tie rod in the lower wall, and the oblong hole engages with the protruding end of the tie rod in the upper wall, so that the tie rod in the upper wall generates vertical displacement within the oblong hole, thereby achieving controlled vertical displacement of the upper wall relative to the lower wall.

3. The structure according to claim 1, wherein, SMA reinforcement is a rod-shaped component that is thicker at both ends and thinner in the middle, with threads at both ends; the diameter of the threaded end is 1.2 to 1.5 times the diameter of the middle section, and the diameter of the middle section is 10 to 20 mm, so that it will deform preferentially in the middle section when it is pulled to dissipate energy and ensure the stability of the end connection. After installation, the SMA reinforcement passes through the circular holes of the corresponding rib beams of the upper and lower walls.

4. The structure according to claim 1, wherein, The SMA steel plate is concave, with a round hole at one end and a cross-shaped groove at the other end. During installation, the round hole end faces upward and the cross-shaped groove end faces downward. The two ends of the SMA steel plate pass through the two threaded ends of the same SMA rib, and the cross-shaped groove is filled by an I-shaped limiting piece to restrict its out-of-plane displacement. Then, the SMA rib and the SMA steel plate are fixed and pressed together by a double-hole steel plate and a nut.

5. The structure according to claim 1, wherein, The four holes of the four-hole steel plate located at the upper and lower ends of the ring spring pass through the longitudinal reinforcement of the limiting rib and the limiting reinforcement, respectively. The four-hole steel plate serves as the bearing pad of the ring spring and together with the limiting component, restricts the lateral displacement of the ring spring.

6. The structure according to claim 1, wherein, Before installing the four-hole steel plate at the top of the annular spring, a PVC pipe is installed in the center of the annular spring and a central concrete is poured, so that the annular spring and the central concrete can bear the pressure together after the annular spring reaches the design compression displacement limit.

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