Two-stage energy dissipation buckling restrained brace and installation method thereof

Abstract

The invention provides a two-stage energy dissipation buckling restrained brace and an installation method thereof, the buckling restrained brace comprises a yield energy dissipation component, the two ends of the yield energy dissipation component are lead screw sections, and the middle of the yield energy dissipation component is a buckling energy dissipation section; the restraining sleeve is arranged on the yield energy dissipation component in a sleeving mode; the two connecting blocks are arranged on the two lead screw sections of the yield energy dissipation component in a sleeving mode correspondingly; the two friction energy dissipation modules correspond to the connecting blocks one to one and are installed in the connecting blocks, the two lead screw sections of the yield energy dissipation component are each sleeved with one friction energy dissipation module, the friction energy dissipation modules can be in friction with the connecting blocks in the connecting blocks and rotate, and relative rotation and axial relative movement exist between the lead screw sections and the friction energy dissipation modules; and the locking assembly is arranged in the connecting block and used for locking the friction energy consumption module so that the friction energy consumption module cannot rotate. According to the method, the structural damping efficiency can be improved, the engineering economy is optimized, and the design targets of vibration double control and efficient damping are achieved.

Description

Technical Field

[0001] The present invention relates to the field of multi - level energy - dissipating braces in building structures, and particularly to a two - stage energy - dissipating buckling - restrained brace and its installation method. Background Art

[0002] In recent years, the buckling - restrained brace (BRB), as an efficient energy - dissipating and seismic - reducing device, has been widely used in various engineering projects and the reinforcement and renovation of existing buildings due to its excellent energy - dissipating ability under large earthquakes and stable hysteretic performance. The traditional BRB dissipates seismic energy through the yield of the core unit, and at the same time relies on the peripheral restraint members to prevent the overall buckling of the brace, thereby significantly improving the seismic performance of the structure. However, the existing BRB technology has obvious limitations: its design goal is mainly aimed at the rare - earthquake condition, and it only enters the yield energy - dissipating stage under large earthquakes; under frequent vibrations such as small earthquakes or wind vibrations, the BRB only provides elastic stiffness contribution and cannot effectively play the role of energy dissipation, and cannot achieve dual control of earthquake and vibration.

[0003] For structures controlled by both wind - vibration sensitivity and seismic action (such as super - high - rise buildings, large - span spatial structures or high - rise towers), the existing BRBs are difficult to meet the vibration - reduction requirements of both conditions. In engineering, it is usually necessary to additionally set up independent wind - vibration control devices, which leads to the complication of structural design and significantly increases the construction cost and space occupation. Therefore, how to achieve the "wind - vibration - earthquake" dual - control function in a single device and break through the limitations of the existing BRB energy - dissipation mechanism has become the key to improving the structural seismic - reduction efficiency and optimizing the engineering economy. Summary of the Invention

[0004] The purpose of the present invention is to provide a two - stage energy - dissipating buckling - restrained brace and its installation method. By reasonably optimizing the end shape of the buckling energy - dissipating section and reasonably combining the end of the buckling energy - dissipating section with the ball screw, the structural seismic - reduction efficiency is improved, the engineering economy is optimized, and the design goals of dual control of earthquake and vibration and high - efficiency seismic reduction are achieved.

[0005] To achieve the above - mentioned purpose, the present invention provides a two - stage energy - dissipating buckling - restrained brace, which includes:

[0006] A yield energy - dissipating member, both ends of the yield energy - dissipating member are screw sections, and the middle part of the yield energy - dissipating member is a buckling energy - dissipating section;

[0007] A restraint sleeve, which is sleeved on the yield energy - dissipating member, and the screw sections are exposed outside the restraint sleeve;

[0008] Two connecting blocks, one connecting block is sleeved on each of the two screw sections of the yield energy - dissipating member;

[0009] Two friction energy dissipation modules, which correspond to the connection blocks one by one and are installed in the connection blocks. One of the friction energy dissipation modules is sleeved on each of the two lead screw segments of the yield energy dissipation member. The friction energy dissipation module is provided with a spiral groove that cooperates with the lead screw segment. The friction energy dissipation module can friction and rotate with the connection block in the connection block. Relative rotation and axial relative movement can exist between the lead screw segment and the friction energy dissipation module, so as to achieve primary energy dissipation;

[0010] A locking assembly, which is arranged in the connection block and is used to lock the friction energy dissipation module so that it cannot rotate.

[0011] Optionally, the connection block is provided with an inner cavity for accommodating the friction energy dissipation module. The friction energy dissipation module includes a rotating friction ring, a first spring, and at least one friction plate. The friction plates are arranged around the rotating friction ring. The friction plates are connected to the rotating friction ring through the first spring. The friction plates are pressed against the inner wall of the inner cavity by the first spring. A gap is left between the ends of the friction plates for the locking assembly to pass through.

[0012] Optionally, the friction energy dissipation module includes two thrust bearings installed in the inner cavity. The two thrust bearings are respectively located at the axial two ends of the rotating friction ring to install the rotating friction ring in the inner cavity.

[0013] Optionally, a locking card slot is provided on the outer periphery of the rotating friction ring. The intervals between the locking card slots and the ends of the friction plates correspond one by one. When the locking assembly extends into the locking card slot, the friction energy dissipation module is locked and cannot rotate.

[0014] Optionally, a slot for accommodating the locking assembly is provided on the inner wall of the inner cavity. The locking assembly includes a second spring and a convex tenon. The convex tenon can be pushed by the second spring to extend into the inner cavity. In the initial state, the convex tenon is squeezed by the friction plate, so that the second spring is in a compressed state, and the convex tenon is located in the inner wall of the inner cavity. When the locking card slot rotates to the corresponding position of the convex tenon, under the push of the second spring, the convex tenon extends into the locking card slot, thereby locking the friction energy dissipation module so that it cannot rotate, and realizing the conversion between primary energy dissipation and secondary energy dissipation.

[0015] Optionally, a relief hole communicating with the inner cavity is provided in the connection block. The relief hole is used for the lead screw segment to move therein.

[0016] Optionally, a transition strengthening section is provided between the lead screw segment and the buckling energy dissipation section of the yield energy dissipation member. The cross section of the transition strengthening section is cross-shaped, and the transition strengthening section is fixedly connected to the constraint sleeve.

[0017] Optionally, a plurality of first constraint rib plates are provided at positions corresponding to the transition strengthening section inside the constraint sleeve, and a cross-shaped gap is formed between the first constraint rib plates to clamp the transition strengthening section.

[0018] Optionally, a plurality of second constraint rib plates are provided at positions corresponding to the buckling energy dissipation section inside the constraint sleeve, and a spacing is left between the second constraint rib plates, and the buckling energy dissipation section passes through the spacing between the second constraint rib plates, so as to constrain the deformation of the buckling energy dissipation section.

[0019] Based on another aspect of the present invention, the present invention further provides an installation method for a two-stage energy-dissipating buckling-restrained brace, which is applied to the two-stage energy-dissipating buckling-restrained brace as described above. The installation method includes:

[0020] Sheathe the constraint sleeve on the yield energy dissipation member;

[0021] Sheathe a friction energy dissipation module on each of the two lead screw sections of the yield energy dissipation member, and the ends of the lead screw sections are exposed outside the friction energy dissipation module;

[0022] Install the friction energy dissipation module in the connection block;

[0023] Erect a fixed truss on the connection block and the constraint sleeve to prevent relative movement between the yield energy dissipation member and the friction energy dissipation module during transportation and installation;

[0024] Install the connection block at the on-site design point;

[0025] Dismantle the fixed truss;

[0026] During maintenance, replace the yield energy dissipation member and / or the friction energy dissipation module.

[0027] With the above configuration, in the present invention, the support end of the yield energy dissipation member is connected to the connection block through the friction energy dissipation module. In the case of wind vibration and minor earthquakes, relative rotation and axial relative movement can exist between the lead screw section and the friction energy dissipation module, so as to achieve primary energy dissipation through the friction energy dissipation module, and through the inertial mass amplification effect of the friction energy dissipation module, the energy dissipation under wind vibration and minor earthquakes is made more efficient. Since the locking card slot is provided on the rotating friction ring and the locking component is provided in the connection block, under the design earthquake (i.e., the medium earthquake, specifically referring to the medium earthquake in building seismic design) and large earthquake displacement, the locking card slot rotates to the corresponding position of the convex tenon of the locking component, and the convex tenon extends into the locking card slot under the push of the second spring, thereby locking the friction energy dissipation module so that it cannot rotate, in order to achieve secondary energy dissipation through the buckling energy dissipation section. To sum up, by reasonably optimizing the end shape of the buckling energy dissipation section, the present invention reasonably combines the end of the buckling energy dissipation section with the ball screw. While ensuring simple installation, it improves the structural shock absorption efficiency, optimizes the engineering economy, and achieves the design goal of double control of earthquake and vibration and efficient shock absorption. Moreover, during maintenance, the convex tenon can be unlocked, which is easy to disassemble. Only the yield energy dissipation member and / or the friction energy dissipation module need to be replaced, and rapid replacement and repair can be achieved.

[0028] It should be noted that the two-stage energy dissipation buckling restrained brace and the installation method of the two-stage energy dissipation buckling restrained brace belong to the same inventive concept and have the same or corresponding specific technical features. Therefore, the installation method of the two-stage energy dissipation buckling restrained brace also has the technical effects of the two-stage energy dissipation buckling restrained brace, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Those of ordinary skill in the art should understand that the provided drawings are used to better understand the present invention and do not constitute any limitation to the scope of the present invention. Among them:

[0030] Figure 1 is a schematic diagram of the two-stage energy dissipation buckling restrained brace according to an embodiment of the present invention;

[0031] Figure 2 is an exploded view of the two-stage energy dissipation buckling restrained brace according to an embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of the yield energy dissipation member of the two-stage energy dissipation buckling restrained brace according to an embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of the restraint sleeve of the two-stage energy dissipation buckling restrained brace according to an embodiment of the present invention;

[0034] Figure 5 is a schematic diagram of the friction energy dissipation module and the connection block of the two-stage energy dissipation buckling restrained brace according to an embodiment of the present invention;

[0035] Figure 6Schematic diagram of the rotational friction ring of the two - stage energy - dissipating buckling - restrained brace according to an embodiment of the present invention;

[0036] Figure 7 Schematic diagram of the connecting block of the two - stage energy - dissipating buckling - restrained brace according to an embodiment of the present invention;

[0037] Figure 8 Schematic diagram of the yield energy - dissipating component penetrating into the restraint sleeve in the installation method of the two - stage energy - dissipating buckling - restrained brace according to an embodiment of the present invention;

[0038] Figure 9 Schematic diagram after step 2 in the installation method of the two - stage energy - dissipating buckling - restrained brace according to an embodiment of the present invention;

[0039] Figure 10 Schematic diagram of installing a fixed truss on the two - stage energy - dissipating buckling - restrained brace according to an embodiment of the present invention.

[0040] Among them, the reference numerals are as follows:

[0041] 1 - Yield energy - dissipating component; 101 - Buckling energy - dissipating section; 102 - Transition strengthening section; 103 - Lead - screw section; 104 - Bolt positioning hole; 2 - Restraint sleeve; 201 - Sleeve body; 202 - Second restraint rib plate; 203 - First restraint rib plate; 204 - Bolt fastening groove; 3 - Friction energy - dissipating module; 301 - Rotational friction ring; 3011 - Friction plate; 3012 - Locking card slot; 3013 - First spring; 302 - Thrust bearing; 4 - Connecting block; 401 - Inner cavity; 4011 - Convex tenon; 4012 - Cavity wall; 4013 - Second spring; 402 - Cover plate; 4021 - Through - hole; 403 - Ear plate; 404 - Relief hole; 405 - Connecting - block body; 5 - Fixed truss; 6 - Positioning bolt. Detailed implementation manners

[0042] In this article, unless otherwise specified, the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "top", "bottom", etc. are used to indicate the orientation or position relationship based on the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation and operation, so it cannot be understood as a limitation to the present invention.

[0043] The following will describe the detailed implementation manners of the present invention in more detail with reference to the schematic diagrams. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non - precise scales, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0044] Figure 1 It is a schematic diagram of the two - stage energy - dissipating buckling - restrained brace according to an embodiment of the present invention, Figure 2Explosion diagram of a two - stage energy - dissipating buckling - restrained brace according to an embodiment of the present invention. Please refer to Figure 1 and Figure 2 , an embodiment of the present invention provides a two - stage energy - dissipating buckling - restrained brace, which includes a yield energy - dissipating component 1, a restraint sleeve 2, two connecting blocks 4, two friction energy - dissipating modules 3 and a locking assembly.

[0045] Please refer to Figure 3 , both ends of the yield energy - dissipating component 1 are screw rod sections 103, and the middle part of the yield energy - dissipating component 1 is a buckling energy - dissipating section 101. The restraint sleeve 2 is sleeved on the yield energy - dissipating component 1, and the screw rod sections 103 are exposed outside the restraint sleeve 2. It can be understood that through the restraint effect, the restraint sleeve 2 can prevent the buckling energy - dissipating section 101 from undergoing local buckling under compression, ensuring that the buckling energy - dissipating section 101 can fully yield along the entire cross - section under the compressive state, thereby dissipating (seismic) energy. The restraint sleeve 2 can be made of steel such as Q355 and above. Filling materials can also be poured into the restraint sleeve 2, or not. Pouring filling materials can play a role in anti - corrosion and rust prevention.

[0046] Preferably, the restraint sleeve 2 is a square tube. There is a transition strengthening section 102 between the screw rod section 103 and the buckling energy - dissipating section 101 of the yield energy - dissipating component 1. The cross - section of the transition strengthening section 102 is cross - shaped, and the transition strengthening section 102 is fixedly connected to the restraint sleeve 2. For example, the yield energy - dissipating component 1 is integrally long - strip - shaped, and the cross - section of the buckling energy - dissipating section 101 is flat - shaped, which is beneficial to enhancing the plastic deformation ability of the buckling energy - dissipating section 101. Moreover, when the flat - shaped core material is in tension and compression, the stress distribution on the cross - section is more uniform (especially along the width direction), which can fully exert the plastic deformation ability of the material and avoid reducing the energy - dissipating efficiency due to local premature yielding. The buckling energy - dissipating section 101 is the main component for buckling energy dissipation, and different metal materials can be used according to different design bearing capacities (such as mild steel, Q235 steel, etc.).

[0047] The cross - section of the transition strengthening section 102 is cross - shaped. For example, the transition strengthening section 102 can be a cross - shaped plate, which plays a strengthening role. The transition strengthening section 102 can be made of steel such as Q355 and above, such as Figure 3 shown. Preferably, there are a plurality of bolt positioning holes 104 on the cross - shaped plate, and the bolt positioning holes 104 extend towards the center of the cross - shape. Please refer to Figure 4, at the position corresponding to the transition strengthening section 102 inside the constraint sleeve 2, a plurality of first constraint rib plates 203 are provided. A cross-shaped gap is formed between the first constraint rib plates 203 to clamp the transition strengthening section 102, that is, to clamp the cross-shaped plate, so as to prevent relative rotation between the constraint sleeve 2 and the yield energy dissipation member 1. At the position corresponding to the buckling energy dissipation section 101 inside the constraint sleeve 2, a plurality of second constraint rib plates 202 are provided. A spacing is left between the second constraint rib plates 202, and the buckling energy dissipation section 101 passes through the spacing between the second constraint rib plates 202, thereby restricting the deformation of the buckling energy dissipation section 101.

[0048] Specifically, the constraint sleeve 2 includes a sleeve body 201, a first constraint rib plate 203 and a second constraint rib plate 202. At the position corresponding to the transition strengthening section 102 on the sleeve body 201, bolt fastening grooves 204 are provided, that is, bolt fastening grooves 204 are provided at both ends of the sleeve body 201. The bolt fastening grooves 204 can be, for example, strip-shaped grooves. The bolt fastening grooves 204 are used to connect and fix the sleeve body 201 and the transition strengthening section 102 through positioning bolts 6. The screw rod of the positioning bolt 6 passes through the bolt fastening groove 204 and is threadedly connected to the bolt positioning hole 104 on the cross-shaped plate. The number of bolt fastening grooves 204 is not limited. In this embodiment, bolt fastening grooves 204 are provided on two opposite side walls at the end of the sleeve body 201.

[0049] A connection block 4 is sleeved on each of the two lead screw sections 103 of the yield energy dissipation member 1. Two friction energy dissipation modules 3 correspond to the connection blocks 4 one by one and are installed in the connection blocks 4. A friction energy dissipation module 3 is sleeved on each of the two lead screw sections 103 of the yield energy dissipation member 1. A spiral groove matching with the lead screw section is provided inside the friction energy dissipation module. The friction energy dissipation module 3 can friction and rotate with the connection block 4 in the connection block 4. Relative rotation and axial relative movement can exist between the lead screw section 103 and the friction energy dissipation module 3, thereby realizing primary energy dissipation. A locking assembly is arranged in the connection block 4 and is used to lock the friction energy dissipation module 3 so that it cannot rotate (that is, the friction energy dissipation module 3 cannot rotate). Further, please refer to Figure 5 and Figure 6, the connecting block 4 is provided with an inner cavity 401 for accommodating the friction energy dissipation module 3. The friction energy dissipation module 3 includes a rotating friction ring 301, a first spring 3013 and at least one friction plate 3011. The rotating friction ring 301 is sleeved on the lead screw section, and a spiral groove matching with the lead screw section is arranged in the rotating friction ring 301. The friction plates 3011 are arranged around the rotating friction ring 301, and the friction plates 3011 are connected to the rotating friction ring 301 through the first spring 3013. The friction plates 3011 are pressed against the inner wall of the inner cavity 401 by the first spring 3013, and a gap is left between the ends of the friction plates 3011 for the locking assembly to pass through. When the number of the friction plates 3011 is one, that is, this friction plate 3011 surrounds the rotating friction ring 301, and a gap is left between the two ends of this friction plate 3011 for the locking assembly to pass through; when the number of the friction plates 3011 is two or more, a gap is left between the ends of two adjacent friction plates 3011 for the locking assembly to pass through.

[0050] It can be understood that, please refer to Figure 7 , a relief hole 404 communicating with the inner cavity 401 is provided in the connecting block 4. The relief hole 404 is used for the lead screw section 103 to move therein to make way for the lead screw section 103.

[0051] For example, a locking slot 3012 is provided on the outer periphery of the rotating friction ring 301, and the intervals between the locking slot 3012 and the ends of the friction plates 3011 correspond one by one, that is, the number of the locking slots 3012 can be equal to the number of the friction plates 3011. When the locking assembly extends into the locking slot 3012, the friction energy dissipation module 3 is locked and cannot rotate. In the present invention, the lead screw section 103 and the rotating friction ring 301 can be a ball screw pair or a sliding screw pair. In this embodiment, a ball screw pair is adopted. It can be understood that when a ball screw pair is adopted, the friction energy dissipation module 3 further includes a plurality of balls. The rotating friction ring 301 is equivalent to the ball screw nut in the ball screw pair, and the balls roll in the spiral groove in the ball screw nut to transmit motion and load. The lead screw section 103 can be welded or rolled into one body with the transition strengthening section 102. The lead screw section 103 is made of high-strength metal materials commonly used in ball screws according to the designed bearing capacity. For example, low-alloy steels such as 9Mn2V and CrWMn can be adopted.

[0052] Please refer to Figure 7, a groove for accommodating a locking component is provided on the cavity wall 4012 of the inner cavity 401. The locking component includes a second spring 4013 and a convex tenon 4011. The convex tenon 4011 can be pushed by the second spring 4013 to extend into the inner cavity 401. In the initial state, the convex tenon 4011 is squeezed by the friction plate 3011, so that the second spring 4013 is in a compressed state, and the convex tenon 4011 is located in the cavity wall 4012 of the inner cavity 401. When the locking groove 3012 rotates to the corresponding position of the convex tenon 4011, under the push of the second spring 4013, the convex tenon 4011 extends into the locking groove 3012, that is, the convex tenon 4011 passes through the distance between the ends of the friction plate 3011 and then extends into the locking groove 3012, thereby locking the friction energy dissipation module 3 so that it cannot rotate, so that the buckling restrained brace of the present invention enters the buckling restrained energy dissipation state and realizes the conversion between primary energy dissipation and secondary energy dissipation.

[0053] It can be understood that the shape of the inner cavity 401 matches the shape of the friction energy dissipation module 3. Specifically, the inner cavity 401 is cylindrical. The friction plate 3011 is arc-shaped, and the cavity wall of the inner cavity 401 is made of a friction material. The friction plate 3011 and the cavity wall of the inner cavity 401 can be made of common friction plate materials such as semi-metallic friction materials, or a friction surface can be formed by processes such as sandblasting and shot peening on the metal surface, and the friction coefficient meets the design requirements. The friction plate 3011 is connected to the rotating friction ring 301 through the first spring 3013. The first spring 3013 can provide a pre-pressure to press the friction plate 3011 against the cavity wall of the inner cavity 401, thereby dissipating energy by friction. And as the rotating friction ring 301 rotates, under the action of centrifugal force, the pressure between the friction plate 3011 and the cavity wall of the inner cavity 401 will increase.

[0054] Exemplarily, the connecting block 4 includes a cover plate 402, a connecting block body 405 and an ear plate 403. It can be understood that both the inner cavity 401 and the relief hole 404 are located in the connecting block body 405, and the ear plate 403 is provided on the connecting block body 405. For example, two ear plates 403 can be provided on one connecting block body 405. The two ear plates 403 are parallel to each other and are arranged on the outer surface of the connecting block body 405. The ear plate 403 is used for fixed connection with the designed point. The cover plate 402 is provided with a through hole 4021 for the lead screw section 103 to pass through. Please refer to Figure 7 .

[0055] Further, the friction energy dissipation module 3 includes two thrust bearings 302 installed in the inner cavity 401. The two thrust bearings 302 are respectively located at the axial two ends of the rotating friction ring 301 to install the rotating friction ring 301 in the inner cavity 401. It can be understood that the lead screw section 103 sequentially passes through the thrust bearing 302, the rotating friction ring 301, and the thrust bearing 302. Specifically, the rotating friction ring 301 is bolted between the two thrust bearings 302. One thrust bearing 302 is fixedly connected to the cover plate 402 by bolts, and the other thrust bearing 302 is fixedly connected to the bottom of the inner cavity 401 by bolts. The through hole 4021 on the cover plate 402, the rotating friction ring 301, and the relief hole 404 form a concentric installation fit, so that the lead screw section 103 can smoothly penetrate.

[0056] Based on another aspect of the present invention, the present invention also provides an installation method for a two-stage energy dissipation buckling-restrained brace, which is applied to the above two-stage energy dissipation buckling-restrained brace. The installation method includes:

[0057] Sheathe the restraint sleeve 2 on the yield energy dissipation member 1; sleeved with a friction energy dissipation module 3 on the two lead screw sections 103 of the yield energy dissipation member 1 respectively, and the ends of the lead screw sections 103 are exposed outside the friction energy dissipation module 3; install the friction energy dissipation module 3 in the connection block 4; erect a fixed truss 5 on the connection block 4 and the restraint sleeve 2 to prevent relative movement between the yield energy dissipation member 1 and the friction energy dissipation module 3 during transportation and installation; install the connection block 4 at the on-site design point; remove the fixed truss 5; during maintenance, replace the yield energy dissipation member 1 and / or the friction energy dissipation module 3.

[0058] The following is a specific embodiment to further elaborate on the installation method of the two-stage energy dissipation buckling-restrained brace.

[0059] Step 1: In the factory, first insert the yield energy dissipation member 1 into the restraint sleeve 2. Please refer to Figure 8 , and connect the positioning bolt 6 through the bolt fastening groove 204 to the bolt positioning hole 104 on the cross-shaped plate of the transition strengthening section 102. The quantity and size of the positioning bolt 6 need to be determined according to the specific parameters of the buckling-restrained brace.

[0060] Step 2: Assemble the friction energy dissipation module 3 and, together with the cover plate 402, sleeved on the lead screw section 103 of the yield energy dissipation member 1, so that the ends of the lead screw section 103 protrude. The exposed length and the reserved length at the end should meet the corresponding requirements of the design displacement of the buckling-restrained brace. Please refer to Figure 9 .

[0061] Step 3: Install the connecting block 4: Push the friction energy dissipation module 3 into the inner cavity 401 of the connecting block 4, so that the first spring 3013 is in a compressed state, and the friction plate 3011 presses against the wall of the inner cavity 401; place the convex tenon 4011 at the position corresponding to the friction plate 3011, so that the friction plate 3011 squeezes and retracts the convex tenon 4011. The distance between the convex tenon 4011 and the locking card slot 3012 needs to be determined by conversion according to the relative displacement stroke at both ends of the yield energy dissipation component 1 when buckling restraint energy dissipation occurs in the buckling restraint brace and the lead screw coefficient selected for the lead screw section 103. Fix one thrust bearing 302 from the end of the connecting block 4 facing away from the cover plate 402 through bolts, and fixedly connect the cover plate 402 to the other thrust bearing 302 through bolts. At the same time, fix the cover plate 402 to the outer surface of the connecting block 4 through bolts. After completing this step, the buckling restraint brace is as Figure 1 shown.

[0062] Step 4: Erect a fixed truss 5 on the connecting block 4 and the restraint sleeve 2, as Figure 10 shown, to prevent relative movement between the yield energy dissipation component 1 and the friction energy dissipation module 3 during transportation and installation.

[0063] Step 5: During on-site hoisting and installation, pass a pin through the ear plate 403 and the ear plate fixed by anchor connection at the designed position to fix the buckling restraint brace at the designed position. After installation in place, reliable fixation, and passing inspection, remove the fixed truss 5.

[0064] During maintenance, such as after an earthquake or during routine maintenance, erect the fixed truss 5 on the connecting block 4 and the restraint sleeve 2 again, and then remove the ear plate 403 from the designed position. The purpose of erecting the fixed truss 5 is to prevent relative movement between the yield energy dissipation component 1 and the friction energy dissipation module 3 during the disassembly process. In this way, the buckling restraint brace is removed from the designed position. Then, remove the fixed truss 5, and replace the yield energy dissipation component 1 and / or the friction energy dissipation module 3 in reverse order of Steps 1 to 3. Preferably, the locking assembly is a structure for mechanically retracting and extending the convex tenon. During post-earthquake maintenance, the convex tenon 4011 can be retracted into the cavity wall 4012 by operating a switch, so as to facilitate the reset, removal, and replacement of the buckling restraint brace.

[0065] With the above configuration, in the present invention, the support end of the yielding energy dissipation member 1 is connected to the connecting block 4 through the friction energy dissipation module 3. In the case of wind vibration and minor earthquakes, relative rotation and axial relative movement can exist between the lead screw section 103 and the friction energy dissipation module 3, so that primary energy dissipation is achieved through the friction energy dissipation module 3, and through the inertial mass amplification effect of the friction energy dissipation module 3, the energy dissipation under wind vibration and minor earthquakes is made more efficient. Since the locking card slot 3012 is provided on the rotating friction ring 301 and the locking assembly is provided in the connecting block 4, under the design earthquake (i.e., the medium earthquake in building earthquake resistance) and large earthquake displacements, the locking card slot 3012 rotates to the corresponding position of the convex tenon 4011 of the locking assembly, and the convex tenon 4011 extends into the locking card slot 3012 under the push of the second spring 4013, thereby locking the friction energy dissipation module 3 so that it cannot rotate, in order to achieve secondary energy dissipation through the buckling energy dissipation section 101. In summary, by reasonably optimizing the end shape of the buckling energy dissipation section 101, the present invention reasonably combines the end of the buckling energy dissipation section 101 with the ball screw. While ensuring simple installation, it improves the structural shock absorption efficiency, optimizes the engineering economy, and achieves the design goal of dual control of shock and vibration and efficient shock absorption. Moreover, during maintenance, the convex tenon 4011 can be unlocked, which is easy to disassemble. Only the yielding energy dissipation member 1 and / or the friction energy dissipation module 3 need to be replaced, and rapid replacement and repair can be achieved.

[0066] It should be noted that the references to "one embodiment", "embodiment", "specific embodiment", "some embodiments", etc. in the specification only indicate that the described embodiments may include specific features, structures or characteristics. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, whether or not it is explicitly described, implementing such a feature, structure or characteristic in combination with other embodiments is within the knowledge scope of those skilled in the relevant art.

[0067] It should be noted that the various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method part.

[0068] It should also be noted that although the present invention has been disclosed above with preferred embodiments, the above embodiments are not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, many possible changes and modifications can be made to the technical solution of the present invention by using the technical content disclosed above, or it can be modified into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still belong to the scope protected by the technical solution of the present invention.

[0069] It should also be understood that unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, rather than to represent the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0070] In addition, it should also be recognized that the terms described herein are only used to describe specific embodiments and are not used to limit the scope of the present invention. It must be noted that the singular forms "a" and "an" used herein and in the appended claims include plural references unless the context clearly dictates otherwise. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices and may include sub-steps as well as sub-devices. All conjunctions used should be understood in their broadest sense. Also, the word "or" should be understood to have the definition of a logical "or", rather than the definition of a logical "exclusive or", unless the context clearly dictates otherwise. In addition, the implementation of the methods and / or devices in the embodiments of the present invention may include performing the selected tasks manually, automatically, or in combination.

Claims

1. A two-stage energy-consuming buckling-restrained brace, characterized in that, Comprising: A yield energy dissipation member, both ends of the yield energy dissipation member are screw rod sections, and the middle part of the yield energy dissipation member is a buckling energy dissipation section; A constraint sleeve, which is sleeved on the yield energy dissipation member, and the screw rod sections are exposed outside the constraint sleeve; Two connecting blocks, one of the two connecting blocks is sleeved on each of the two screw rod sections of the yield energy dissipation member; Two friction energy dissipation modules, which correspond to the connecting blocks one by one and are installed in the connecting blocks. One of the two friction energy dissipation modules is sleeved on each of the two screw rod sections of the yield energy dissipation member. The friction energy dissipation module is provided with a spiral groove that cooperates with the screw rod section. The friction energy dissipation module can friction and rotate with the connecting block in the connecting block. There can be relative rotation and axial relative movement between the screw rod section and the friction energy dissipation module, so as to achieve primary energy dissipation; A locking assembly, which is arranged in the connecting block and is used to lock the friction energy dissipation module so that it cannot rotate.

2. The two-stage energy-consuming buckling-restrained brace according to claim 1, wherein The connecting block is provided with an inner cavity for accommodating the friction energy dissipation module. The friction energy dissipation module includes a rotating friction ring, a first spring and at least one friction plate. The friction plates are arranged around the rotating friction ring. The friction plates are connected to the rotating friction ring through the first spring. The friction plates are pressed against the inner wall of the inner cavity by the first spring. There is a gap between the ends of the friction plates for the locking assembly to pass through.

3. The two-stage energy-dissipating buckling-restrained brace according to claim 2, wherein, The friction energy dissipation module includes two thrust bearings installed in the inner cavity. The two thrust bearings are respectively located at the axial two ends of the rotating friction ring to install the rotating friction ring in the inner cavity.

4. The two-stage energy-dissipating buckling-restrained brace according to claim 2, wherein, The outer periphery of the rotating friction ring is provided with locking card slots, and the intervals between the locking card slots and the ends of the friction plates correspond one by one. When the locking assembly extends into the locking card slots, the friction energy dissipation module is locked and cannot rotate.

5. The two-stage energy-dissipating buckling-restrained brace according to claim 4, characterized in that, The inner wall of the inner cavity is provided with a groove for accommodating the locking assembly. The locking assembly includes a second spring and a convex tenon. The convex tenon can be pushed by the second spring to extend into the inner cavity; in the initial state, the convex tenon is squeezed by the friction plate, so that the second spring is in a compressed state, and the convex tenon is located in the inner wall of the inner cavity; When the locking card slot rotates to the corresponding position of the convex tenon, under the push of the second spring, the convex tenon extends into the locking card slot, thereby locking the friction energy dissipation module so that it cannot rotate, and realizing the conversion between primary energy dissipation and secondary energy dissipation.

6. The two-stage energy-consuming buckling-restrained brace according to claim 2, wherein The connecting block is provided with a relief hole communicating with the inner cavity, and the relief hole is used for the screw rod section to move therein.

7. The two-stage energy-consuming buckling-restrained brace according to claim 1, wherein A transition strengthening section is arranged between the screw rod section and the buckling energy dissipation section of the yield energy dissipation member. The cross section of the transition strengthening section is cross-shaped, and the transition strengthening section is fixedly connected to the constraint sleeve.

8. The two-stage energy-dissipating buckling-restrained brace according to claim 7, wherein A plurality of first constraint rib plates are arranged at the position corresponding to the transition strengthening section in the constraint sleeve. A cross-shaped gap is formed between the first constraint rib plates to clamp the transition strengthening section.

9. The two-stage energy-consuming buckling-restrained brace according to claim 1, wherein A plurality of second restraint rib plates are provided at positions corresponding to the buckling energy dissipation section within the restraint sleeve, and a spacing is left between the second restraint rib plates, and the buckling energy dissipation section passes through the spacing between the second restraint rib plates, so as to restrain the deformation of the buckling energy dissipation section.

10. A method for installing a two-stage energy-dissipating buckling-restrained brace, which is applied to the two-stage energy-dissipating buckling-restrained brace described in any one of claims 1-9, characterized in that, Including: Sheathing a restraint sleeve on the yield energy dissipation member; A friction energy dissipation module is sleeved on each of the two lead screw sections of the yield energy dissipation member, and the ends of the lead screw sections are exposed outside the friction energy dissipation module; Installing the friction energy dissipation module in a connection block; Erecting a fixed truss between the connection block and the restraint sleeve to prevent relative movement between the yield energy dissipation member and the friction energy dissipation module during transportation and installation; Installing the connection block at the on-site designed position; Removing the fixed truss; During maintenance, replacing the yield energy dissipation member and / or the friction energy dissipation module.

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