Prefabricated Concrete Self-Resetting Energy-Dissipating Column Foot Joint Structure and Construction Method

Abstract

This invention discloses a prefabricated concrete self-resetting energy-dissipating column base joint structure and construction method, relating to the field of seismic resistance technology for prefabricated building structures. It includes: a precast concrete column, a precast concrete foundation, unbonded prestressing tendons, and multiple energy-dissipating components. One end of the unbonded prestressing tendon is anchored in the precast concrete foundation, and the other end passes through the concrete column and is anchored to the top of the precast concrete column. The energy-dissipating components are fixedly installed at the end of the precast concrete column near the precast concrete foundation. This invention is applicable to prefabricated buildings, effectively enhancing the energy dissipation capacity of the joint structure, reducing damage and destruction of the structure under seismic action, and enabling automatic resetting.

Description

Technical Field

[0001] This invention relates to the field of seismic resistance technology for prefabricated building structures, and in particular to a prefabricated concrete self-resetting energy-dissipating column base joint structure and its construction method. Background Technology

[0002] With the advancement of my country's "14th Five-Year Plan," prefabricated buildings will become the future development direction of the construction industry. Currently, the column base joints of prefabricated concrete frame columns adopt wet-type fully cast-in-place connection joints, which have the problems of relatively complex on-site construction, difficulty in controlling construction quality, and inability to reduce earthquake damage and improve post-earthquake repairability.

[0003] Self-resetting structures are a new type of structure designed to reduce residual deformation of building structures after an earthquake. This system can effectively control the maximum deformation of the structure and reduce or even eliminate residual deformation, enabling the building structure to quickly restore its functionality after an earthquake.

[0004] Therefore, how to apply self-setting structures to prefabricated buildings, and how to leverage their excellent seismic performance while simplifying prefabricated node connections, is of great significance for accelerating the promotion of prefabricated buildings in my country and driving the industrialization and commercialization of prefabricated buildings. Summary of the Invention

[0005] The purpose of this invention is to provide a prefabricated concrete self-resetting energy-dissipating column base joint structure and construction method to solve the problems existing in the prior art. It can be applied to prefabricated buildings, effectively enhance the energy dissipation capacity of the joint structure, reduce the damage and destruction of the structure under seismic action, and can automatically reset.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a prefabricated concrete self-resetting energy-dissipating column base node structure, comprising: a precast concrete column, a precast concrete foundation, unbonded prestressing tendons, and multiple energy-dissipating components. One end of the unbonded prestressing tendon is anchored in the precast concrete foundation, and the other end passes through the concrete column and is anchored to the top of the precast concrete column. The energy-dissipating components are fixedly disposed at one end of the precast concrete column near the precast concrete foundation.

[0008] Preferably, the precast concrete column includes an upper column and a lower column. The upper column is integrally formed with the lower column and is located above the lower column. The center lines of the upper column and the lower column coincide. A mortise is provided at the top of the precast concrete foundation, and the lower column extends into the mortise.

[0009] Preferably, a gap is provided between the mortise and the lower column.

[0010] Preferably, it also includes an energy-consuming component fixing component, which is embedded in one end of the upper column near the lower column, and each energy-consuming component is fixedly mounted on the energy-consuming component fixing component.

[0011] Preferably, the energy-consuming component fixing component includes a base plate and multiple side frame shells. The base plate has a first through hole in the middle for the lower column to pass through. Each side frame shell is welded and fixed to the outer side of the base plate and forms a ring. The base plate is located between the upper column and the precast concrete foundation. The base plate and each side frame shell are embedded and fixed to the upper column. A placement station is formed between the base plate and the side frame shells, and the energy-consuming component is fixedly installed in the placement station.

[0012] Preferably, the structure further includes a plurality of first thin-walled steel pipes and a plurality of second thin-walled steel pipes. Each first thin-walled steel pipe is embedded and fixed in the precast concrete column to replace the longitudinal steel bars in the precast reinforced concrete beam. The unbonded prestressed tendons pass through the ducts in the first thin-walled steel pipes. The second thin-walled steel pipes are provided on the precast concrete foundation at positions corresponding to the first thin-walled steel pipes. The unbonded prestressed tendons pass through the ducts in the second thin-walled steel pipes and are anchored to the precast concrete foundation.

[0013] Preferably, the unbonded prestressing tendon is a steel strand wrapped with anti-corrosion lubricating grease and a polyethylene sheath. The unbonded prestressing tendon in the first thin-walled steel pipe is filled with an unbonded micro-expansion material between itself and the first thin-walled steel pipe, and the unbonded prestressing tendon in the second thin-walled steel pipe is filled with an unbonded micro-expansion material between itself and the second thin-walled steel pipe.

[0014] Preferably, the energy-consuming component is a low-yield-point energy-consuming soft steel.

[0015] Preferably, it also includes a grouting protective layer, which wraps around the outside of the energy-consuming mild steel.

[0016] The present invention also provides a construction method for the prefabricated concrete self-resetting energy-dissipating column base joint structure as described above, comprising the following steps:

[0017] The precast concrete columns are fabricated.

[0018] Processing and fabricating the precast concrete foundation;

[0019] Install the unbonded prestressing tendon, anchor one end of the unbonded prestressing tendon in the precast concrete foundation, and anchor the other end through the concrete column to the top of the precast concrete column;

[0020] Install the energy-consuming component and fix it to one end of the precast concrete column near the precast concrete foundation.

[0021] The present invention achieves the following technical effects compared to the prior art:

[0022] This invention provides a prefabricated concrete self-resetting energy-dissipating column base joint structure and construction method. By setting energy-dissipating components, the plastic behavior under seismic loads is concentrated in these components, which can be disassembled and replaced, improving post-earthquake repair capabilities and making repair convenient and efficient. By controlling the damage sequence, it meets the seismic toughness requirements under multiple seismic levels. Furthermore, by using unbonded prestressed tendons and anchoring both ends of the unbonded prestressed tendons to the precast concrete column and foundation respectively, the unbonded prestressed tendons can achieve automatic repositioning, reducing residual displacement of the structure under earthquakes and improving the seismic performance of the column base joint. Simultaneously, the repositioning components can generate relative slippage relative to the precast concrete column and foundation, exhibiting good energy dissipation capabilities. All components can be prefabricated in the factory, requiring only assembly and prestressing tensioning on site, reducing labor costs and environmental pollution, aligning with the green, environmentally friendly, and energy-efficient development concept of prefabricated buildings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural schematic diagram of the prefabricated concrete self-resetting energy-dissipating column base node provided by the present invention.

[0025] Figure 2 This is a front view of the prefabricated concrete self-resetting energy-dissipating column base node provided by the present invention.

[0026] Figure 3 This is a schematic diagram of the precast concrete column in the prefabricated concrete self-resetting energy-dissipating column base node provided by the present invention.

[0027] Figure 4 This is a schematic diagram of the concrete foundation in the prefabricated concrete self-resetting energy-dissipating column foot node provided by the present invention.

[0028] Figure 5 This is a structural schematic diagram of the energy-dissipating component fixing element in the prefabricated concrete self-resetting energy-dissipating column base node provided by the present invention.

[0029] In the diagram: 1. Precast concrete column; 2. Concrete foundation; 3. Base plate; 4. Energy-consuming mild steel; 5. Side frame shell; 6. Unbonded prestressed tendon; 7. First thin-walled steel pipe; 8. Second thin-walled steel pipe; 9. Anchor; 10. Lower column; 11. Mortise; 12. First through hole; 13. Second through hole. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The purpose of this invention is to provide a prefabricated concrete self-resetting energy-dissipating column base joint structure and construction method to solve the problems existing in the prior art. It can be applied to prefabricated buildings, effectively enhance the energy dissipation capacity of the joint structure, reduce the damage and destruction of the structure under seismic action, and can automatically reset.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] This embodiment provides a prefabricated concrete self-resetting energy-dissipating column base joint structure, such as... Figures 1-5 As shown, the structure includes: a precast concrete column 1, a precast concrete foundation 2, unbonded prestressing tendons 6, and multiple energy dissipation components. One end of the unbonded prestressing tendon 6 is anchored to the precast concrete foundation 2 by an anchor 9, and the other end passes through the concrete column and is anchored to the top of the precast concrete column 1 by the anchor 9. The energy dissipation components are detachably fixed at one end of the precast concrete column 1 near the precast concrete foundation 2. By setting the energy dissipation components, the plastic behavior under seismic action is concentrated in the energy dissipation components, and the energy dissipation components can be disassembled and replaced, improving the post-earthquake repair capability and making repair convenient and efficient. By controlling the damage sequence, the seismic toughness requirements under multiple seismic levels are met. In addition, by using the unbonded prestressing tendons 6 and anchoring both ends of the unbonded prestressing tendons 6 to the precast concrete column 1 and the precast concrete foundation 2 respectively, the unbonded prestressing tendons 6 can achieve automatic reset, reducing the residual displacement of the structure under earthquakes and improving the seismic performance of the column base joint. Meanwhile, the reset component can slip relative to the precast concrete column 1 and the precast concrete foundation 2, and has good energy dissipation capacity; all components can be prefabricated in the factory, and only need to be assembled and prestressed on site, reducing labor costs and environmental pollution, which is in line with the development concept of green, environmentally friendly, efficient and energy-saving prefabricated buildings.

[0035] In a preferred embodiment, the precast concrete column 1 includes an upper column and a lower column 10. The upper column and the lower column 10 are integrally formed and the upper column is located above the lower column 10. The center lines of the upper column and the lower column 10 coincide. The top of the precast concrete foundation 2 is provided with a mortise 11, and the lower column 10 extends into the mortise 11. The area of ​​the lower column 10 is similar to confined concrete, so even if the axial compression of the column is relatively large, no damage will occur.

[0036] In a preferred embodiment, a gap is provided between the mortise 11 and the lower column 10 to facilitate construction and assembly.

[0037] In a preferred embodiment, it further includes an energy-consuming component fixing member, which is embedded at one end of the upper column near the lower column 10, and each energy-consuming component is detachably fixed to the energy-consuming component fixing member.

[0038] In a preferred embodiment, the energy-consuming component fixing component includes a base plate 3 and multiple side frame shells 5. A first through hole 12 is provided in the middle of the base plate 3 for passing through the lower column 10. Each side frame shell 5 is welded and fixed to the outer side of the base plate 3. The base plate 3 is located between the upper column and the precast concrete foundation 2. The base plate 3 and each side frame shell 5 are embedded and fixed to the upper column. A placement station is formed between the base plate 3 and the side frame shells 5. The energy-consuming component is fixedly installed in the placement station. There is enough space for the energy-consuming component to be inspected during normal use and replaced after an earthquake. Multiple second through holes 13 are provided on the base plate 3 for the unbonded prestressed tendons 6 to pass through.

[0039] In a preferred embodiment, the prefabricated concrete self-resetting energy-dissipating column base joint structure further includes multiple first thin-walled steel pipes 7 and multiple second thin-walled steel pipes 8. The first thin-walled steel pipes 7 are embedded and fixed in the precast concrete column 1 to replace the original longitudinal reinforcement of the precast concrete column, and unbonded prestressed tendons 6 pass through the channels within the first thin-walled steel pipes 7. Second thin-walled steel pipes 8 are installed on the precast concrete foundation 2 at positions corresponding to the first thin-walled steel pipes 7. Unbonded prestressed tendons 6 pass through the channels within the second thin-walled steel pipes 8 and are anchored to the precast concrete foundation 2. The longitudinal reinforcement of the precast concrete column 1 is replaced by thin-walled steel pipes 7, with unbonded prestressed tendons 6 installed inside and extending throughout the entire height of the joint, saving steel reinforcement and reducing the self-weight of the precast concrete column 1. The unbonded prestressed tendons 6 assume the load-bearing function of the original longitudinal reinforcement, while the thin-walled steel pipes 7 assume the structural function of the original longitudinal reinforcement. This provides a self-resetting function for the joint without reducing the original structural performance.

[0040] In a preferred embodiment, the unbonded prestressing tendon 6 is an unbonded high-strength, low-relaxation steel strand with an outer sheath of anti-corrosion lubricating grease and polyethylene. The unbonded prestressing tendon 6 in the first thin-walled steel tube is filled with an unbonded micro-expansion material between itself and the first thin-walled steel tube. The unbonded prestressing tendon 6 in the second thin-walled steel tube is filled with an unbonded micro-expansion material between itself and the second thin-walled steel tube, ensuring that the unbonded prestressing tendon 6 can slide freely within the ducts of the first and second thin-walled steel tubes. The number of unbonded prestressing tendons 6 and the tension control stress are determined by calculation, and the prestressing tendons should maintain elasticity under rare earthquakes of the corresponding fortification intensity.

[0041] In a preferred embodiment, the energy-dissipating component is a low-yield-point energy-dissipating soft steel 4. The energy-dissipating soft steel 4 can adjust its energy-dissipating capacity by changing its shape, size, and thickness, providing great flexibility. When an earthquake acts on the joint, the low-yield-point energy-dissipating soft steel 4 will enter the yielding stage before the main structure, thereby dissipating a large amount of seismic energy to ensure the safety of the main structure. After the earthquake, the precast concrete column 1 is reset to its original position under the action of unbonded prestressed steel strands. The replaceable energy-dissipating soft steel 4 is cut, and a new energy-dissipating soft steel 4 is welded to complete the joint repair.

[0042] In a preferred embodiment, the prefabricated concrete self-resetting energy-dissipating column base joint structure also includes a grouting protective layer. The grouting protective layer wraps around the outside of the energy-dissipating soft steel 4, which can not only prevent out-of-plane buckling of the energy-dissipating soft steel 4 and improve the bearing capacity and energy dissipation capacity, but also prevent joint corrosion.

[0043] Example 2

[0044] This embodiment also provides a construction method for the prefabricated concrete self-resetting energy-dissipating column base joint structure of Embodiment 1, including the following steps:

[0045] Fabrication of precast concrete columns 1;

[0046] 2. Fabrication of precast concrete foundations;

[0047] Install unbonded prestressed tendons 6, anchor one end of the unbonded prestressed tendons 6 in the precast concrete foundation 2, and anchor the other end through the concrete column to the top of the precast concrete column 1.

[0048] Install the energy-consuming component and fix it to one end of the precast concrete column 1 near the precast concrete foundation 2.

[0049] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A prefabricated concrete self-resetting energy-dissipating column base joint structure, characterized in that: include: A precast concrete column, comprising an upper column and a lower column, wherein the upper column and the lower column are integrally formed and the upper column is located above the lower column, and the center lines of the upper column and the lower column coincide; Precast concrete foundation, Unbonded prestressing tendons, one end of which is anchored in the precast concrete foundation and the other end passes through the concrete column and is anchored at the top of the precast concrete column; The system includes multiple energy-consuming components, which are fixedly installed at one end of the precast concrete column near the precast concrete foundation. It also includes an energy-consuming component fixing member embedded at one end of the upper column near the lower column. Each energy-consuming component is fixedly installed on the fixing member. The fixing member includes a base plate and multiple side frame shells, each side frame shell welded and fixed to the outer edge of the base plate, forming a ring. A placement station is provided on each side frame shell, and the energy-consuming component is fixedly installed in the placement station. The energy-consuming component is low-yield-point energy-consuming soft steel, and the system also includes a grouting protective layer wrapped around the outside of the energy-consuming soft steel.

2. The prefabricated concrete self-resetting energy-dissipating column base joint structure according to claim 1, characterized in that: The top of the precast concrete foundation is provided with a mortise, and the lower column extends into the mortise.

3. The prefabricated concrete self-resetting energy-dissipating column base joint structure according to claim 2, characterized in that: A gap is provided between the mortise and the lower column.

4. The prefabricated concrete self-resetting energy-dissipating column base joint structure according to claim 1, characterized in that: The base plate has a first through hole in the middle, which is used to allow the lower column to pass through. The base plate is located between the upper column and the precast concrete foundation. The base plate and each of the side frame shells are embedded and fixed to the upper column.

5. The prefabricated concrete self-resetting energy-dissipating column base joint structure according to claim 1, characterized in that: It also includes multiple first thin-walled steel pipes and multiple second thin-walled steel pipes. Each first thin-walled steel pipe is embedded and fixed in the precast concrete column to replace the original longitudinal reinforcement of the precast concrete column. The unbonded prestressed tendons pass through the ducts in the first thin-walled steel pipes. The second thin-walled steel pipes are set at positions corresponding to the first thin-walled steel pipes on the precast concrete foundation. The unbonded prestressed tendons pass through the ducts in the second thin-walled steel pipes and are anchored to the precast concrete foundation.

6. The prefabricated concrete self-resetting energy-dissipating column base joint structure according to claim 5, characterized in that: The unbonded prestressing tendon is a steel strand wrapped with anti-corrosion lubricating grease and a polyethylene sheath. The unbonded prestressing tendon in the first thin-walled steel pipe is filled with an unbonded micro-expansion material between itself and the first thin-walled steel pipe. The unbonded prestressing tendon in the second thin-walled steel pipe is filled with an unbonded micro-expansion material between itself and the second thin-walled steel pipe.

7. A construction method for a prefabricated concrete self-resetting energy-dissipating column base joint structure as described in any one of claims 1 to 6, characterized in that: Includes the following steps: Processing and manufacturing the precast concrete columns; Processing and fabricating the precast concrete foundation; Install the unbonded prestressing tendon, anchor one end of the unbonded prestressing tendon in the precast concrete foundation, and anchor the other end through the concrete column to the top of the precast concrete column; Install the energy-consuming component and fix it to one end of the precast concrete column near the precast concrete foundation.

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