BRB connection node capable of enhancing anti-seismic performance
By pre-embedding of steel in the main bearing member of the BRB connection node and setting up shears, the problem of insufficient bearing capacity of the BRB connection node in the high intensity area is solved, the shear and bending bearing capacity of the node are improved, and the effective connection of the BRB with high bearing capacity is achieved.
Patent Information
- Application Number
- CN202422252633.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-13
AI Technical Summary
In the prior art, the bearing capacity of the BRB connecting node in the high intensity region is insufficient, resulting in a significant reduction in the stiffness of the node region, which is unable to meet the needs of the BRB with high bearing capacity.
By pre-embedding the steel in the main bearing member and setting anti-shear parts on the flange of the steel, the shear transmission efficiency between the steel and concrete is improved, thereby increasing the bearing capacity of the node core area.
It improves the shear and bending bearing capacity of the BRB connection node, can be applied to BRB with high bearing capacity, and conforms to the design concept of strong nodes and weak components, reducing engineering cost.
Smart Images
Figure CN223034186U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of seismic resistance of building structures, and particularly relates to a BRB connection node for enhancing seismic performance. Background Technique
[0002] As a seismic energy dissipation component, the buckling-restrained brace (BRB) is more and more widely used in reinforced concrete frame structures. Compared with the force-bearing conditions of ordinary beam-column joints, the mechanical behavior between the buckling-restrained brace and the beam-column joints of reinforced concrete frames is more complex. The action of its diagonal force on the beam-column joints cannot be ignored. The premise for ensuring the normal energy dissipation of BRB is that the joints do not fail during earthquakes. The installation and connection methods of BRB also need to be carefully designed and studied to ensure the coordination and balance between it and the reinforced concrete frame joints. The existing common BRB connection nodes in reinforced concrete have the following problems:
[0003] 1. When connecting ordinary reinforced concrete structures with BRB, the traditional node connection form of embedded plate + anchor bars is adopted. This connection form only transfers the force to the concrete beam-column joints through the anchor bars or embedded parts, but does not effectively strengthen the joints themselves, and can only be used in the case of low BRB bearing capacity. In areas with high seismic intensity, the bearing capacity of BRB is relatively high. When using the traditional node connection form, the concrete beam-column joints of reinforced concrete will first show the situation of concrete cracking or steel bar yielding, resulting in a significant reduction in the stiffness of the joint area. It is not conducive to the realization of the design concept of strong joints and weak members.
[0004] 2. The bearing capacity of BRB arranged in high-seismic-intensity areas is often relatively large, generally exceeding 3000 kN. After preliminary calculation, when the yield bearing capacity of the energy-dissipating BRB is 1000 kN, at least 17 steel bars with a diameter of 25 need to be arranged, and the arrangement of the anchor bar layers does not meet the requirements specified in the concrete code; when it exceeds 1500 kN, the traditional embedded plate + anchor bars can no longer meet the calculation and construction requirements.
[0005] 3. For BRB with large bearing capacity, steel beams and steel columns are usually selected to ensure the connection. However, in actual situations, the bearing capacity calculations of frame columns and frame beams do not require embedded steel sections, which causes a certain waste. Content of the Utility Model
[0006] The purpose of the utility model is to provide a BRB connection node for enhancing seismic performance to solve the deficiencies of the existing technology. By adopting this solution, the embedded steel section undertakes the shear force and axial force transmitted from the BRB node, and the shear transfer efficiency between the steel section and the concrete is improved through shear-resistant members, so as to increase the bearing capacity of the joint core area in sequence, and it can be applied to BRB with high bearing capacity.
[0007] The utility model is realized through the following technical solutions:
[0008] A BRB connection node for enhancing seismic performance, comprising intersecting main load-bearing members and energy-dissipating members. At the intersection position of the main load-bearing member and the energy-dissipating member, a section steel is embedded in the main load-bearing member;
[0009] The energy-dissipating member is connected to the section steel through a gusset plate;
[0010] The section steel is arranged along the length direction of the main load-bearing member; the section steel is provided with flanges, and a plurality of shear-resistant members are fixed on the flanges. One end of each shear-resistant member is fixed on the flange, and the other end is arranged in a direction away from the flange.
[0011] Compared with the prior art, in the traditional connection form of embedded plate + anchor bars, the node itself is not effectively strengthened and can only be used in the case of relatively low BRB bearing capacity, and cannot be applied to BRBs arranged in high-intensity areas. The utility model provides a BRB connection node for enhancing seismic performance. By adopting this solution, the shear force and axial force transmitted from the BRB node are borne by the embedded section steel, and the shear force transfer efficiency between the section steel and the concrete is improved through the shear-resistant members, thereby increasing the bearing capacity of the node core area in sequence and being applicable to high-bearing-capacity BRBs. In a specific solution, the intersection position of the main load-bearing member and the energy-dissipating member is the seismic node. The main load-bearing member can be a single beam, a single column, or intersecting beam-columns. The intersecting beam-columns have intersecting beams and columns, that is, the intersection position of the beam and the column is the seismic node. At this time, an energy-dissipating member, that is, a BRB, is arranged at this node. In the above structure, a section steel is embedded in the main load-bearing member, and the BRB is welded to the section steel through a gusset plate. In this way, through the embedded strengthened section steel, the lateral force generated by the BRB can be transmitted to the node center through the gusset plate and the section steel, achieving the purpose of reliable force and improving the shear and bending resistance bearing capacity of the node core area. In addition, a plurality of shear-resistant members are evenly distributed on the flanges of the section steel, and the other ends of the shear-resistant members are arranged in a direction away from the flanges. At this time, they extend into the concrete. In this way, the shear force can be quickly transmitted to the concrete, and the BRB node force is jointly borne by the section steel and the concrete area, improving the shear force transfer efficiency between the section steel and the concrete within the limited length range of the section steel. Secondly, by only arranging the section steel at the node position, it can not only ensure the connection between the BRB and the node, strengthen the shear and bending resistance bearing capacity of the node, conform to the design concept of strong nodes and weak members, but also reduce the project cost. For high-bearing-capacity BRBs, usually for nodes with a bearing capacity greater than 3000 KN, strengthened section steel is embedded at the nodes, avoiding the need to arrange section steel throughout the frame columns and frame beams, improving the bearing capacity of the beam-column node core area, and also having certain economic benefits.
[0012] For collaborative force bearing, the profiled steel is arranged at the center of the main load-bearing member. Among them, the profiled steel is arranged along the center line of the main load-bearing member, and can participate in shear resistance and bending resistance collaboratively. The collaborative force bearing enables the cross-sectional size of the profiled steel to be smaller under the same load, making it easier to avoid conflicts between the BRB connection nodes and the beam-column steel bars, and facilitating construction.
[0013] As several different application scenarios, the main load-bearing member is a beam, a column or an intersecting beam-column.
[0014] As a specific structure of the seismic joint in the intersecting beam-column, when the main load-bearing member is the intersecting beam-column, the profiled steel includes profiled steel in the beam and profiled steel in the column. The profiled steel in the beam is embedded in the beam and arranged along the length direction of the beam; the profiled steel in the column is embedded in the column and arranged along the length direction of the column; the profiled steel in the beam and the profiled steel in the column intersect and are fixed. Among them, the beam and the column are perpendicular to each other, the profiled steel in the beam and the profiled steel in the column are perpendicular to each other, and one end of the profiled steel in the beam is fixed on the profiled steel in the column.
[0015] To improve the connection strength, the profiled steel in the beam and the profiled steel in the column are welded and fixed to each other.
[0016] To form symmetric and uniform force bearing, the profiled steel adopts I-beam.
[0017] To reduce the residual stress generated by welding through staggered distribution of upper and lower layers, on the flanges on both sides of the I-beam, a number of shear-resistant members are arranged on both the inner and outer sides of the flange, and the number of shear-resistant members arranged on the inner and outer sides of the flange are staggered.
[0018] As a redundant solution, the shear-resistant member is perpendicular to the flange.
[0019] As a specific structure of the shear-resistant member, the shear-resistant member is a shear stud, and the head of the shear stud is arranged in a direction away from the flange.
[0020] To ensure the continuity of the longitudinal steel bars, the gusset plate is perpendicular to the profiled steel and connected to the center of the profiled steel; at the intersection position of the gusset plate and the internal longitudinal bars of the main load-bearing member, stiffening plates are arranged on the gusset plate, and the stiffening plates are arranged along the length direction of the longitudinal bars. Among them, the connection of the gusset plate will affect the position of the longitudinal bars, so stiffening plates are arranged in the area affecting the position of the longitudinal bars to ensure the continuity of the longitudinal steel bars.
[0021] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0022] 1. A BRB connection node for enhancing seismic performance provided by the present utility model. By using this enhanced node, the steel plates embedded in the beam and column are effectively connected in a way that the steel plates are staggeredly arranged on the top and bottom surfaces of the flange, and the embedded parts cooperate to improve the shear bearing capacity of the joint connection area. For high-bearing-capacity BRB connection nodes, on the premise of ensuring safety, the economic benefits of joint connection are improved.
[0023] 2. A BRB connection node for enhancing seismic performance provided by the present utility model. By using this enhanced node, the size of the embedded steel plates is appropriate and the layout is reasonable, which makes it easier to avoid the conflict between the BRB connection node and the beam-column steel bars, and ensures the construction convenience of high-bearing-capacity BRB connection nodes.
[0024] 3. A BRB connection node for enhancing seismic performance provided by the present utility model. By using the feature that the steel plates embedded in the beam and column in the joint core area are effectively connected, the shear resistance of the joint core area is improved, and the goal of strong joints and weak members is achieved. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, form a part of this application, and do not limit the embodiments of the present utility model. In the drawings:
[0026] Figure 1 is a schematic diagram of the internal structure of the seismic joint at the intersecting beam and column provided by the present utility model;
[0027] Figure 2 is a sectional view A-A of the seismic joint at the intersecting beam and column provided by the present utility model;
[0028] Figure 3 is a schematic diagram of the internal structure of the seismic joint at the mid-span of a single beam provided by the present utility model;
[0029] Figure 4 is a sectional view B-B of the seismic joint at the mid-span of the beam provided by the present utility model;
[0030] Figure 5 is an analysis diagram of BRB force transmission at the seismic joint provided by the present utility model;
[0031] Figure 6 is a force analysis diagram at the seismic joint provided by the present utility model.
[0032] Marks in the drawings and corresponding component names:
[0033] 1 - Steel shape in beam, 2 - Steel shape in column, 3 - Shear member, 4 - Longitudinal bar, 5 - Stiffening plate, 6 - Gusset plate. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0034] To make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the embodiments and the accompanying drawings. The illustrative embodiments of the present utility model and their descriptions are only used to explain the present utility model and shall not be construed as limiting the present utility model.
[0035] Embodiment 1:
[0036] Embodiment 1 provides a BRB connection node for enhancing seismic performance. As Figures 1 - 6 shown, it includes an intersecting main load-bearing member and energy-dissipating member. At the intersecting position of the main load-bearing member and the energy-dissipating member, a profiled steel is embedded in the main load-bearing member;
[0037] The energy-dissipating member is connected to the profiled steel through a gusset plate 6;
[0038] The profiled steel is arranged along the length direction of the main load-bearing member; the profiled steel has flanges, and a number of shear-resistant members 3 are fixed on the flanges. One end of the shear-resistant member 3 is fixed on the flange, and the other end is arranged in a direction away from the flange.
[0039] Compared with the traditional node connection form of embedded plate + anchor bars in the prior art, which does not effectively strengthen the node itself and can only be used in the case of relatively low BRB bearing capacity, and cannot be applied to BRBs arranged in high-intensity areas. The utility model provides a BRB connection node with enhanced seismic performance. By adopting this solution, the embedded steel section undertakes the shear force and axial force transmitted from the BRB node, and the shear connectors 3 are used to improve the shear force transfer efficiency between the steel section and the concrete, thereby increasing the bearing capacity of the node core area in sequence and enabling it to be applied to BRBs with high bearing capacity. In a specific solution, the intersection position of the main load-bearing member and the energy-dissipating member is the seismic node. The main load-bearing member can be a single beam, a single column, or intersecting beam and column. The intersecting beam and column have an intersecting beam and column, that is, the intersection position of the beam and the column is the seismic node. At this time, an energy-dissipating member, that is, a BRB, is arranged at this node. In the above structure, a steel section is embedded in the main load-bearing member, and the BRB is welded to the steel section through the gusset plate 6. In this way, through the embedded strengthened steel section, the lateral force generated by the BRB can be transmitted to the node center through the gusset plate 6 and the steel section, achieving the purpose of reliable force-bearing and improving the shear and flexural bearing capacity of the node core area. In addition, a number of shear connectors 3 are evenly distributed on the flange of the steel section, and the other end of the shear connector 3 is arranged in a direction away from the flange and extends into the concrete at this time. In this way, the shear force can be quickly transmitted to the concrete, and the BRB node force is jointly borne by the steel section and the concrete area, improving the shear force transfer efficiency between the steel section and the concrete within the limited length range of the steel section. Secondly, only arranging the steel section at the node position can not only ensure the connection between the BRB and the node, strengthen the shear and flexural bearing capacity of the node, meet the design concept of strong node and weak member, but also reduce the project cost. For BRBs with high bearing capacity, usually for nodes with a bearing capacity greater than 3000 KN, strengthened steel sections are embedded at the nodes, avoiding the need to arrange steel sections throughout the frame columns and frame beams, improving the bearing capacity of the beam-column node core area, and also having certain economic benefits.
[0040] For collaborative force-bearing, the steel section is arranged at the center of the main load-bearing member. Among them, the steel section is arranged on the center line of the main load-bearing member, which can participate in shear resistance and flexural resistance collaboratively. Collaborative force-bearing enables the cross-sectional size of the steel section to be smaller under the same load, making it easier to avoid conflicts between the BRB connection node and the beam-column steel bars and facilitating construction.
[0041] As several different application scenarios, the main load-bearing member is a beam, a column, or intersecting beam and column. As Figure 3 and Figure 4 shown, only in the scenario of a single beam, a steel section is embedded in the beam.
[0042] Embodiment 2:
[0043] This Embodiment 2 further limits on the basis of Embodiment 1. As Figure 1 and Figure 2 shown, it is a specific structure of a seismic node in intersecting beam and column.
[0044] When the main load-bearing member is an intersecting beam-column, the profiled steel includes the profiled steel 1 inside the beam and the profiled steel 2 inside the column. The profiled steel 1 inside the beam is embedded in the beam and arranged along the length direction of the beam; the profiled steel 2 inside the column is embedded in the column and arranged along the length direction of the column; the profiled steel 1 inside the beam and the profiled steel 2 inside the column intersect and are fixed. Among them, the beam and the column are perpendicular to each other, the profiled steel 1 inside the beam and the profiled steel 2 inside the column are perpendicular to each other, and one end of the profiled steel 1 inside the beam is fixed on the profiled steel 2 inside the column. Taking the energy-dissipating BRB with a bearing capacity of 5000 kN as an example, the length of the profiled steel embedment is 1.0 m; two rows of φ19 stud bolts with a spacing of 100 are arranged densely on the upper and lower parts of the top and bottom flanges, which can meet the specification requirements.
[0045] To improve the connection strength, the profiled steel 1 inside the beam and the profiled steel 2 inside the column are welded and fixed to each other.
[0046] To form symmetric and uniform stress, the profiled steel adopts I-beam.
[0047] To reduce the residual stress generated by welding through staggered distribution of the upper and lower layers, on the flanges on both sides of the I-beam, a number of shear-resistant members 3 are arranged on both the inner and outer sides of the flange, and the number of shear-resistant members 3 arranged on the inner and outer sides of the flange are staggered.
[0048] As a redundant solution, the shear-resistant member 3 is perpendicular to the flange.
[0049] As a specific structure of the shear-resistant member 3, the shear-resistant member 3 is a shear stud bolt, and the head of the shear stud bolt is arranged in a direction away from the flange.
[0050] To ensure the continuity of the longitudinal reinforcement, the gusset plate 6 is perpendicular to the profiled steel and connected to the center of the profiled steel; at the intersection position of the gusset plate 6 and the internal longitudinal reinforcement 4 of the main load-bearing member, a stiffening plate 5 is arranged on the gusset plate 6, and the stiffening plate 5 is arranged along the length direction of the longitudinal reinforcement 4. Among them, the connection of the gusset plate 6 will affect the position of the longitudinal reinforcement 4, so the stiffening plate 5 is arranged in the area affecting the position of the longitudinal reinforcement 4 to ensure the continuity of the longitudinal reinforcement.
[0051] Force principle: As Figure 5 and Figure 6 shown, it can be seen from Figure 5 that the axial force N transmitted by the BRB is transmitted to the profiled steel 1 inside the beam and the profiled steel 2 inside the column through the gusset plate 6, an axial force Tb and a shear force Vb are formed on the surface of the profiled steel 1 inside the beam, and an axial force Tc and a shear force Vc are formed on the surface of the profiled steel 2 inside the column; Figure 6For the overall force condition of the node, the shear force Vstud generated by the shear studs on the frame beam is balanced with the shear force Vb of the gusset plate 6 on the beam. Taking moments about the node, the bending moment generated by the axial force Tb on the frame beam is balanced with the flexural capacity of the steel section 1 in the beam; the force condition of the gusset plate 6 of the frame column is similar to the above. The shear force Vstud generated by the shear studs on the frame column is balanced with the shear force Vc of the gusset plate 6 on the column, and the bending moment generated by the tensile force Tc on the frame column is balanced with the flexural capacity of the steel section 2 in the column.
[0052] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A BRB connection node with enhanced seismic performance, comprising intersecting main load-bearing components and energy-absorbing components, characterized in that: At the intersection of the main load-bearing component and the energy-absorbing component, a steel section is embedded in the main load-bearing component; The energy-absorbing component is connected to the steel section via a node plate (6); The steel section is arranged along the length direction of the main load-bearing member; the steel section has a flange, and a plurality of shear-resistant members (3) are fixed on the flange; one end of the shear-resistant member (3) is fixed on the flange, and the other end is arranged in a direction away from the flange.
2. A BRB connection node with enhanced seismic performance according to claim 1, characterized in that: The steel section is arranged at the center of the main load-bearing component.
3. A BRB connection node with enhanced seismic performance according to claim 1, characterized in that: The main load-bearing components are beams, columns or intersecting beams and columns.
4. A BRB connection node with enhanced seismic performance according to claim 3, characterized in that: When the main load-bearing member is an intersecting beam-column, the steel section comprises a beam inner steel section (1) and a column inner steel section (2), wherein the beam inner steel section (1) is pre-buried in the beam and arranged along the length direction of the beam; the column inner steel section (2) is pre-buried in the column and arranged along the length direction of the column; The beam inner steel (1) and the column inner steel (2) are intersected and fixed.
5. A BRB connection node with enhanced seismic performance according to claim 4, characterized in that: The beam inner steel (1) and the column inner steel (2) are welded and fixed to each other.
6. A BRB connection node with enhanced seismic performance according to claim 1, characterized in that: The steel section adopts I-beam.
7. A BRB connection node with enhanced seismic performance according to claim 6, characterized in that: On the flanges at both sides of the I-beam, a plurality of anti-shear members (3) are arranged on both inner and outer sides of the flanges, and the plurality of anti-shear members (3) arranged on both inner and outer sides of the flanges are staggered.
8. A BRB connection node with enhanced seismic performance according to claim 7, characterized in that: The shear member (3) is perpendicular to the flange.
9. A BRB connection node with enhanced seismic performance according to claim 8, characterized in that: The shear-resistant member (3) is a shear-resistant stud, and the head of the shear-resistant stud is arranged in a direction away from the flange.
10. A BRB connection node with enhanced seismic performance according to any one of claims 1 to 9, characterized in that: The node plate (6) is perpendicular to the steel section and connected to the center of the steel section; a stiffening plate (5) is provided on the node plate (6) at the intersection of the node plate (6) and the longitudinal reinforcement (4) inside the main load-bearing member, and the stiffening plate (5) is provided along the length direction of the longitudinal reinforcement (4).