A multi-stage yield energy dissipation brace structure and method with adjustable constitutive relationship

Abstract

The application discloses a multi-stage yield energy dissipation support structure with adjustable constitutive relation and a method, relates to the technical field of civil engineering anti-seismic and energy dissipation and shock absorption, and comprises end part one, a BRB parallel unit and end part two. The end part one comprises a rigid cross base one, the end part of the rigid cross base one is provided with a first connecting assembly, and the first connecting assembly is connected with one end of the BRB parallel unit. The end part two comprises a rigid cross base two, the end part of the rigid cross base two is provided with a second connecting assembly, and the second connecting assembly is connected with the other end of the BRB parallel unit. The application adopts the multi-stage yield energy dissipation support structure with adjustable constitutive relation, and proposes a kind of energy dissipation support with adjustable progressive degradation stiffness, which can realize the load-deformation relationship of multi-fold line, and is applied to proportionally improve the inter-story stiffness and bearing capacity of building structure under different seismic intensity.

Description

Technical Field

[0001] This invention relates to the field of seismic resistance and energy dissipation technology in civil engineering, and in particular to a multi-stage yielding energy dissipation support structure and method with adjustable constitutive relations. Background Technology

[0002] Among traditional reinforcement measures, buckling-restrained braces (BRBs) are highly effective and important components. They can effectively increase structural stiffness and absorb seismic energy and reduce structural response through the yielding energy dissipation of the internal steel core. The working principle of a BRB is: under minor earthquakes, it operates in an elastic phase, increasing the stiffness of the reinforced structure and reducing its deformation response; under major earthquakes, the steel core inside the brace yields and deforms, dissipating energy and achieving energy dissipation and vibration reduction. Because the steel core has weak compressive bearing capacity, the BRB core is usually encased in a steel tube and filled with material to restrain it from buckling deformation. However, traditional BRBs have three significant drawbacks: Disadvantage 1: The bearing capacity deformation curve of BRB is not consistent with the interlayer bearing capacity deformation curve of the reinforced structure.

[0003] The failure of reinforced concrete members under lateral deformation generally goes through three stages, and their load-bearing capacity-deformation relationship can be approximated by a three-segmented line model: Stage 1, before concrete cracking, both concrete and reinforcement are in the elastic stage, and the member has elastic lateral stiffness. Stage 2, after concrete cracking and before reinforcement yielding, the member stiffness decreases due to cracking. Stage 3, after reinforcement yielding, the member's lateral stiffness decreases significantly until the member fails. The structural story stiffness and story bearing capacity are a comprehensive reflection of the stiffness and bearing capacity of different types of members, and therefore their changes with story deformation are more complex. Therefore, the structural story bearing capacity-deformation curve differs significantly from the bearing capacity-deformation curve of the traditional BRB approximation, which is a bi-segmented line model.

[0004] Disadvantage 2: It is difficult to precisely match the seismic resistance requirements of multiple levels.

[0005] Under different earthquake intensities and deformation levels, the ratio of additional stiffness to structural stiffness, and the ratio of additional bearing capacity to structural bearing capacity, cannot remain constant. This makes it impossible to consistently adjust the distribution of structural layer stiffness and bearing capacity under multiple earthquake magnitudes.

[0006] Disadvantage 3: Limited adjustment and difficult replacement.

[0007] It is impossible to adapt to the diverse changes in the bearing capacity and deformation relationship of the structural layers by adjusting the supports, and it is impossible to quickly replace the supports in the event of earthquake damage. Summary of the Invention

[0008] The purpose of this invention is to provide a multi-stage yield energy dissipation support structure and method with adjustable constitutive relations, thereby solving the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides a multi-stage yield energy dissipation support structure with adjustable constitutive relations, including an end one, a BRB parallel unit and an end two. The end one includes a rigid cross base one, and a first connecting component is provided at the end of the rigid cross base one. The first connecting component is connected to one end of the BRB parallel unit. The second end includes a rigid cross base, and a second connecting component is provided at the end of the rigid cross base. The second connecting component is connected to the other end of the BRB parallel unit.

[0010] Preferably, the first connecting assembly includes four connecting units, each of which includes a connecting screw that is connected at one end to the rigid cross base, and a rigid pad is provided at the connection between the connecting screw and the rigid cross base. The other end of the connecting screw is provided with a threaded part, and a fixing washer is provided at the joint between the threaded part and the connecting screw. The threaded part is connected to the knob nut.

[0011] Preferably, the four connecting screws are each set to a different length.

[0012] Preferably, the second connecting assembly includes a fixed base plate connected to the rigid cross base on one side, and the fixed base plate has four screw holes, each of which is connected to a flange bolt; A connecting cylinder is connected to the other side of the fixed base plate. A rigid pad is provided at the connection between the connecting cylinder and the fixed base plate. The flange bolt extends through the rigid pad into the connecting cylinder.

[0013] Preferably, the BRB parallel unit includes four BRB units, and the four BRB units are all set to different lengths.

[0014] Preferably, each BRB monomer includes a straight yield energy-dissipating steel core, with a cross link one and a cross link two respectively provided at both ends of the straight yield energy-dissipating steel core. A fixing screw is provided at the end of the cross link two, and a spiral link is provided at the end of the cross link one.

[0015] Preferably, a sleeve is provided on the outside of the straight yield energy dissipation steel core, and a wrapping material is filled between the sleeve and the straight yield energy dissipation steel core; The cross-section of the sleeve is set to square.

[0016] Preferably, the spiral connecting rod is threaded, and the spiral connecting rod is connected to the knob nut through the thread.

[0017] Preferably, the fixing screw has a through hole inside, and the fixing screw is connected to the flange bolt through the through hole.

[0018] A method for a constitutive relation-tunable multi-stage yielding energy dissipation support structure includes the following steps: S1. Fix the fixing screw of the BRB unit to the connecting cylinder at end two using flange bolts. S2. Nest the knob nuts onto the corresponding spiral connecting rods and connecting screws respectively. The length of each connecting screw at one end is different. Check whether the connecting screws correspond one-to-one with the BRB unit to ensure correct connection. S3. By fine-tuning the knob nut, bring the yield support structure to its final state and install it into the device to be reinforced.

[0019] Therefore, the present invention employs the above-mentioned constitutive relation-adjustable multi-stage yield energy dissipation support structure and method, which has the following beneficial effects: (1) Performance matching: This structure innovatively uses the idea of ​​multiple BRBs in parallel and multi-stage yielding to realize the energy dissipation support of the multi-segment bearing capacity-deformation relationship, and accurately matches the inter-story shear force-deformation relationship of the reinforced concrete structure from elasticity, cracking to yielding; it solves the problem that the traditional BRB can only realize two-segment constitutive structures and cannot achieve full-process matching reinforcement.

[0020] (2) Proportional Enhancement: This structure innovatively uses the idea of ​​multiple BRBs in parallel to achieve fine matching under the seismic fortification target of multiple levels. It ensures that under different seismic intensities and deformation levels from elastic to yield, the additional stiffness and bearing capacity and the original performance of the structure always maintain a stable proportional relationship. The structure and inter-story shear are improved in a proportional and coordinated manner, ensuring the consistency of the global performance distribution of the structure. It solves the problem that traditional BRBs cannot meet the consistent adjustment of the stiffness and bearing capacity distribution of the structural story under multiple levels of earthquakes, and it is difficult to finely match the seismic resistance requirements of multiple levels.

[0021] (3) Easy to replace and adjust: This structure innovatively adopts a BRB modular design, which gives the structure extremely high adjustment flexibility and rapid post-earthquake recovery. The modular design and flexible combination of energy dissipation units realize multilinear customization of the bearing capacity-deformation constitutive relationship of the supports, which can accurately adapt to the diverse performance requirements of the structural layers. At the same time, the detachable structural design ensures that damaged units can be replaced efficiently and quickly after an earthquake, which significantly improves the seismic toughness of the structure and reduces the maintenance cost throughout its life cycle; it solves the problems of not being able to adapt to the diverse changes in the bearing capacity-deformation relationship of the structural layers by adjusting the supports and not being able to quickly replace the supports in the event of earthquake damage.

[0022] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a multi-stage yield energy dissipation support structure with adjustable constitutive relation according to the present invention. Figure 2 This is a three-dimensional structural schematic diagram of a multi-stage yield energy dissipation support structure with adjustable constitutive relation according to the present invention. Figure 3 This is a schematic diagram of the end of a multi-stage yield energy dissipation support structure with adjustable constitutive relation according to the present invention. Figure 4 This is a schematic diagram of the end portion of a multi-stage yield energy dissipation support structure with adjustable constitutive relations according to the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the end portion of a multi-stage yield energy dissipation support structure with adjustable constitutive relations according to the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the BRB parallel unit of a constitutive relation-adjustable multi-stage yield energy dissipation support structure according to the present invention. Figure 7 This is a schematic diagram of the structure of a BRB monomer with a constitutive relation-adjustable multi-stage yield energy dissipation support structure according to the present invention. Figure 8 This is a schematic diagram of the BRB monomer after removing the sleeve, which is a constitutive relation-adjustable multi-stage yield energy dissipation support structure of the present invention. Reference numerals: 1. End unit 1; 11. Rigid cross base 1; 2. BRB parallel unit; 20. BRB unit; 21. Straight yield energy dissipation steel core; 22. Cross connecting rod 1; 23. Cross connecting rod 2; 24. Fixing screw; 241. Through hole; 25. Helical connecting rod; 26. Sleeve; 3. End unit 2; 31. Rigid cross base 2; 4. First connecting assembly; 41. Connecting screw; 42. Rigid pad 1; 43. Threaded part; 44. Fixing pad; 45. Knob nut; 5. Second connecting assembly; 51. Fixing base plate; 52. Flange bolt; 53. Connecting cylinder; 54. Rigid pad 2. Detailed Implementation

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] Example Please see Figures 1-8 The present invention provides a multi-stage yield energy dissipation support structure with adjustable constitutive relation, including end 1, BRB parallel unit 2 and end 2 3.

[0027] End 1 is a rigid connection structure, including a rigid cross base 11. The rigid cross base 11 is used to transfer loads from the outside to a rigid pad 42. The cross structure ensures sufficient load-bearing capacity. A first connecting component 4 is provided at the end of the rigid cross base 11, and the first connecting component 4 is connected to one end of the BRB parallel unit 2. The first connecting component 4 includes four connecting units, each of which includes a connecting screw 41 connected at one end to the rigid cross base 11. The four connecting screws 41 are of different lengths, used to connect BRB units 20 of different lengths. A rigid pad 42, which is a thick steel sheet, is provided at the connection point between the connecting screw 41 and the rigid cross base 11 to transfer the load from the base to the BRB unit 20. The other end of the connecting screw 41 is provided with a threaded part 43. A fixing pad 44 is provided at the junction of the threaded part 43 and the connecting screw 41. The threaded part 43 is connected to the knob nut 45. The knob nut 45 is a regular hexagonal prism with a through-hole for rotating this structure to finely adjust the distance between the BRB unit 20 and the base.

[0028] End unit 2 3 includes a rigid cross base 2 31, which transfers external loads to the pad plate. The cross structure ensures sufficient load-bearing capacity. A second connecting assembly 5 is provided at the end of the rigid cross base 2 31, connecting to the other end of the BRB parallel unit 2. The second connecting assembly 5 includes a fixed base plate 51 connected to the rigid cross base 2 31 on one side. The fixed base plate 51 has four screw holes in a grid pattern, each with a flange bolt 52 connected to it. The four BRB units 20 are fixed to the fixed base plate 51 using the flange bolts 52. A connecting cylinder 53 is connected to the other side of the fixed base plate 51. The connecting cylinder 53 has a thick wall for inserting the fixing screw 24, providing partial lateral restraint. A rigid pad 2 54 is provided at the connection between the connecting cylinder 53 and the fixed base plate 51. The flange bolt 52 extends through the rigid pad 2 54 into the connecting cylinder 53. The rigid pad 2 54 is a thick steel sheet used to transfer the load from the base to the BRB unit 20.

[0029] The BRB parallel unit 2 includes four independent BRB units 20 arranged in a grid pattern, with each of the four BRB units 20 having a different length. To address varying strength requirements of the structures to be reinforced, the four BRB units 20 of different lengths can be selected to compensate for any missing strength in the structures to be reinforced, ensuring that each layer of the structure to be reinforced achieves the desired strength after reinforcement.

[0030] Each BRB unit 20 includes a straight yielding energy-dissipating steel core 21, which is the core structure of the BRB unit 20. The straight yielding energy-dissipating steel core 21 is a long steel bar with a rectangular cross-section, used to dissipate energy through longitudinal yielding deformation when the structure is subjected to strong loads. A sleeve 26 is fitted around the straight yielding energy-dissipating steel core 21, and a wrapping material is filled between the sleeve 26 and the straight yielding energy-dissipating steel core 21 to prevent buckling under pressure. In this embodiment, the sleeve 26 is a long steel cylinder with a square cross-section. Cross-link 1 22 and cross-link 23 are respectively provided at both ends of the straight yielding energy-dissipating steel core 21. Both are used to transfer loads and do not yield. A fixing screw 24 is provided at the end of cross-link 23. The fixing screw 24 has a through hole 241 inside, and the fixing screw 24 is connected to a flange bolt 52 through the through hole 241 to fix the BRB unit 20 and end 2 3, preventing relative rotation between the BRB unit 20 and end 2 3. The end of the cross link 22 is provided with a helical link 25, which is threaded and connected to the knob nut 45 via the thread, for adjusting the distance between the BRB unit 20 and the end 1.

[0031] This structure arranges multiple independent buckling-restrained energy-dissipating elements with different energy-dissipating steel core lengths in parallel within the support section, and these elements are easy to replace. By utilizing the differences in the energy-dissipating steel core lengths, the strain of the steel cores can be adjusted under the same deformation conditions. This allows each energy-dissipating unit to sequentially enter the yield state during the same deformation process, thereby enabling the entire energy-dissipating support to achieve a multilinear bearing capacity deformation relationship under seismic loading. Furthermore, by replacing the energy-dissipating units and adjusting the length of the energy-dissipating steel core, the multilinear bearing capacity deformation relationship can be adjusted.

[0032] This structure uses a support made of multiple BRB units 20 connected in parallel, solving the problems of difficult maintenance and inconvenient replacement of traditional BRBs. The two ends of each BRB unit 20 are connected to end 1 and end 3 respectively via knob nuts 45 and flange bolts 52. This not only firmly fixes the BRB units 20 to the overall device but also allows for quick installation and removal of the BRB units 20 via the knob nuts 45. Tightening the knob nuts 45 allows for fine-tuning the distance from each BRB unit 20 to end 1, ensuring that BRB units 20 of different lengths can be adapted to this device, thereby improving the compatibility of the device with the structure to be reinforced. This design significantly improves the efficiency of device installation and disassembly, significantly reduces costs, and offers far greater practicality and reinforcement effect than traditional BRBs.

[0033] To ensure that each BRB unit 20 has the same deformation, the total length of the structure can be the same, allowing multiple BRB units 20 to bear the load simultaneously. However, if the total length of the BRB units 20 is the same, staged yielding cannot be achieved. Therefore, this structure is designed with a rigid cross base 11 with connecting bolts 41 of different lengths, and a knob nut 45 that is nested together with the connecting bolts 41 and the BRB units 20. By turning the knob nut 45, quick disassembly and fine-tuning of the total length of the components can be achieved, so that all BRB units 20 of different lengths within the fine-tuning range of the device can be used, and the total length of the structure is the same.

[0034] This invention also provides a method to achieve a multi-stage load-strain relationship in BRB (Brass Intake Bar) so that its stress-strain curve perfectly matches the stress-strain curve of reinforced concrete. The principle is as follows: A stress-strain curve for steel is a bisegmented curve; superimposing another bisegmented curve creates a trisegmented curve. However, two stress-strain curves for the same steel are identical, and their superposition still results in a bisegmented curve. This can be addressed from the perspective of the strain formula: When two steel bars undergo the same deformation under the same stress, their strains will differ if their total lengths are different. Therefore, treating the two steel bars as a whole, their load-bearing capacity-deformation relationship can be represented in three stages due to different yield points, which is shown as a three-segmented curve in the image. Based on this, this structure arranges four BRB units in a parallel, crisscross pattern. The structural load-bearing capacity-deformation relationship can then become five stages under four yielding events, represented as a five-segmented curve in the image. This design method greatly expands the applicability of the device and makes the transitions between different working stages smoother, thus perfectly simulating and matching the reinforcement of reinforced concrete structures under various conditions.

[0035] The structure employing the above principles can achieve the requirements of energy dissipation, increased structural stiffness, and load-bearing capacity. Addressing the technical problems of existing BRBs (Brake Brakes) exhibiting inconsistent load-deformation curves with the inter-story load-deformation curves of the reinforced structure, low post-yield stiffness, and difficulty in precisely matching multi-level seismic requirements, this structure designs an improved BRB that achieves multi-segmented stress-strain curves through segmented differentiated stiffness design. This improved BRB provides stiffness during minor earthquakes, maintains stiffness during moderate earthquakes, moderately dissipates energy, and fully utilizes its energy dissipation capacity during major earthquakes, achieving performance optimization across all stages.

[0036] The above-mentioned method for installing a multi-stage yield energy dissipation brace with adjustable constitutive relations includes the following steps: S1. Fix the fixing screw 24 of BRB unit 20 to the connecting cylinder 53 of end 2 3 by flange bolts 52. S2. Nest the knob nut 45 onto the corresponding spiral connecting rod 25 and connecting screw 41 respectively. Each connecting screw 41 at end 1 has a different length. Check whether the connecting screw 41 and the BRB unit 20 correspond one-to-one to ensure correct connection. S3. By fine-tuning the knob nut 45, the yield support structure is brought to its final state, and the yield support structure is installed into the device to be reinforced.

[0037] The above-mentioned method for dismantling a multi-stage yielding energy-dissipating support structure with adjustable constitutive relations includes the following steps: S10. Remove the fixing screw 24 connecting the BRB unit 20 and the flange bolt 52 connecting the end two 3 to the connecting cylinder 53. S20. Tighten the knob nut 45 nested in the corresponding spiral connecting rod 25 and connecting screw 41 to one side of the connecting screw 41, and remove the four BRB units 20. S30. Remove end 1 and end 3 of the BRB unit 20 from the structure to be reinforced.

[0038] At work: During an earthquake, the overall structural deformation increases, and all BRB units 20 deform by the same length. At this point, the shorter the BRB unit 20, the smaller its cross-sectional area after deformation. Initially, all four BRB units 20 are in the elastic stage, and the overall stiffness of the structure is equal to the sum of the stiffnesses of the four units. As the deformation increases, the shortest BRB unit 20 experiences the largest change in cross-section and yields first, subsequently entering a plastic mode with negligible stiffness. At this point, the overall stiffness of the structure is equal to the sum of the stiffnesses of the remaining three BRB units 20. As the deformation further increases, the second shortest BRB unit 20 begins to yield, and its stiffness further decreases, and so on, until all four BRB units 20 yield. The overall stress-strain curve of the structure in the above process is a five-segment curve. By adjusting the length of each BRB unit 20, the stress-strain curve of the supporting structure can ultimately be made to perfectly match that of the reinforced concrete structure.

[0039] After starting work: Under seismic loading, due to the horizontal seismic force, some BRB units 20 in the structure yield after the load is applied, and the damaged BRB units 20 need to be replaced. At this time, simply remove the flange bolts 52 at the connection between the damaged BRB unit 20 and end 2 3, and screw the knob nut 45 onto the connecting screw 41 at end 1 to remove it. The reinstallation process is the same as the installation process before the work.

[0040] Therefore, this invention adopts the above-mentioned constitutive relation adjustable multi-stage yield energy dissipation support structure and method, and proposes an energy dissipation support with adjustable progressive degradation stiffness that can realize multi-segment bearing capacity-deformation relationship. It is applied to proportionally improve the inter-story stiffness and bearing capacity of building structures under different earthquake intensities, and realizes graded response of elasticity in small earthquakes, semi-rigidity in moderate earthquakes, and yield energy dissipation in large earthquakes.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A multi-stage yielding energy dissipation support structure with adjustable constitutive relations, characterized in that: It includes end one, BRB parallel unit and end two. End one includes rigid cross base one. The end of rigid cross base one is provided with a first connecting component. The first connecting component is connected to one end of BRB parallel unit. The second end includes a rigid cross base, and a second connecting component is provided at the end of the rigid cross base. The second connecting component is connected to the other end of the BRB parallel unit.

2. The constitutive relation-adjustable multi-stage yield energy dissipation support structure according to claim 1, characterized in that: The first connecting assembly includes four connecting units, each of which includes a connecting screw that is connected at one end to the rigid cross base. A rigid pad is provided at the connection point between the connecting screw and the rigid cross base. The other end of the connecting screw is provided with a threaded part, and a fixing washer is provided at the joint between the threaded part and the connecting screw. The threaded part is connected to the knob nut.

3. A constitutive relation-adjustable multi-stage yield energy dissipation support structure according to claim 2, characterized in that: The four connecting screws are each set to a different length.

4. A constitutive relation-adjustable multi-stage yield energy dissipation support structure according to claim 3, characterized in that: The second connecting assembly includes a fixed base plate connected to the rigid cross base on one side. The fixed base plate has four screw holes, and a flange bolt is connected to each screw hole. A connecting cylinder is connected to the other side of the fixed base plate. A rigid pad is provided at the connection between the connecting cylinder and the fixed base plate. The flange bolt extends through the rigid pad into the connecting cylinder.

5. A constitutive relation-adjustable multi-stage yield energy dissipation support structure according to claim 4, characterized in that: The BRB parallel unit includes four BRB units, each of which is configured to have a different length.

6. A constitutive relation-adjustable multi-stage yield energy dissipation support structure according to claim 5, characterized in that: Each BRB unit includes a straight yield energy-dissipating steel core, with a cross link one and a cross link two respectively provided at both ends of the straight yield energy-dissipating steel core. A fixing screw is provided at the end of the cross link two, and a spiral link is provided at the end of the cross link one.

7. A constitutive relation-adjustable multi-stage yield energy dissipation support structure according to claim 6, characterized in that: The outer sleeve of the straight yield energy dissipation steel core is provided with a sleeve, and the space between the sleeve and the straight yield energy dissipation steel core is filled with wrapping material; The cross-section of the sleeve is set to square.

8. A constitutive relation-adjustable multi-stage yield energy dissipation support structure according to claim 7, characterized in that: The spiral connecting rod is threaded, and the spiral connecting rod is connected to the knob nut through the thread.

9. A constitutive relation-adjustable multi-stage yield energy dissipation support structure according to claim 8, characterized in that: The fixing screw has a through hole inside, and the fixing screw is connected to the flange bolt through the through hole.

10. A method for applying the constitutive relation-adjustable multi-stage yield energy dissipation support structure as described in claim 9, characterized in that, Includes the following steps: S1. Fix the fixing screw of the BRB unit to the connecting cylinder at end two using flange bolts. S2. Nest the knob nuts onto the corresponding spiral connecting rods and connecting screws respectively. The length of each connecting screw at one end is different. Check whether the connecting screws correspond one-to-one with the BRB unit to ensure correct connection. S3. By fine-tuning the knob nut, bring the yield support structure to its final state and install it into the device to be reinforced.

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