Replaceable connection node function recoverable steel pipe recycled concrete frame

Abstract

The application discloses a replaceable connecting node function recoverable steel pipe recycled concrete frame, which comprises two steel pipe recycled concrete columns and a steel beam located between the two steel pipe recycled concrete columns, and the bottom of each side surface of the steel pipe recycled concrete column is connected with an ear plate, and the bottom of each steel pipe recycled concrete column is connected with a foundation slab, and the replaceable connecting node function recoverable steel pipe recycled concrete frame further comprises a plurality of weakened steel plate dampers, each of which is connected with the foundation slab and the ear plate through bolts, a plurality of prestressed tendons are connected between the upper part of each steel pipe recycled concrete column and the end of the steel beam through bolt anchoring, a fishbone block is connected on each prestressed tendon, and an L-shaped connecting plate is further connected between the upper part of each steel pipe recycled concrete column and the end of the steel beam. In an earthquake, the weakened steel plate dampers, the ear plates and the prestressed tendons can all play a role in energy dissipation, and the structure is connected through bolts, so that the frame can be replaced in time when the structure is damaged and fails, thereby effectively reducing the maintenance cost of the frame and prolonging the service life of the frame.

Description

Technical Field

[0001] This invention belongs to the field of seismic-resistant building structure technology, specifically involving a functionally recoverable steel pipe recycled concrete frame with replaceable connection nodes. Background Technology

[0002] Buildings constructed using traditional earthquake-resistant design methods may not collapse during earthquakes, thus protecting lives and property, but most of their components undergo excessive plastic deformation after an earthquake, making them difficult to reinforce and repair. This often results in the buildings being demolished and rebuilt, causing enormous waste and economic losses.

[0003] With the rapid increase in urban population and the continuous improvement in building density, if a building structure only survives an earthquake but suffers significant damage, its normal function will be rendered unusable, severely impacting people's normal production and lives. Therefore, while meeting the basic seismic fortification goals of "no damage in minor earthquakes, repairable in moderate earthquakes, and no collapse in major earthquakes," how to effectively mitigate earthquake damage and enable structures to quickly restore their functionality after an earthquake has attracted widespread attention from researchers.

[0004] Concrete-tube steel frames (CVS-CFF) effectively improve the seismic performance of buildings, reduce earthquake damage, and protect people's lives and property, making them widely used in engineering structures. Existing CVS-CFFs often use natural aggregate concrete, resulting in significant consumption of natural sand and gravel resources. Recycled aggregate concrete, on the other hand, can fully utilize waste concrete, aligning with green and environmentally friendly development requirements. Furthermore, most beam-column and column base connections in CVS-CFFs are currently rigid, and rigid connections are prone to brittle failure during earthquakes, leading to the collapse of the entire frame. Moreover, rigid connections damaged in earthquakes often require large-scale repair and reinforcement, increasing project costs and impacting project progress. Summary of the Invention

[0005] The purpose of this invention is to provide a functional recoverable steel pipe recycled concrete frame with replaceable connection nodes, which solves the problems of existing concrete frames being easily damaged and difficult to repair in earthquakes.

[0006] The technical solution adopted in this invention is a functionally recoverable steel pipe recycled concrete frame with replaceable connection nodes, including two steel pipe recycled concrete columns and a steel beam located between the two steel pipe recycled concrete columns. Each side of the steel pipe recycled concrete column is connected to an ear plate at its bottom, and the bottom of each steel pipe recycled concrete column is connected to a foundation cap. It also includes multiple weakened steel plate dampers. Each weakened steel plate damper is connected to the foundation cap and ear plate by bolts. The upper part of each steel pipe recycled concrete column and the end of the steel beam are connected by bolts to multiple prestressing tendons. Each prestressing tendon is connected to a herringbone block. An L-shaped connecting plate is also connected between the upper part of each steel pipe recycled concrete column and the end of the steel beam.

[0007] The invention is also characterized by:

[0008] A rotating support rod is also connected between the upper part of each steel pipe recycled concrete column and the end of the steel beam.

[0009] The rotating support rod includes an inner support rod with one end connected to the upper part of the steel pipe recycled concrete column, and an outer support rod with one end connected to the steel beam. The other end of the inner support rod is connected to the other end of the outer support rod through a pin.

[0010] The fishbone blocks are made of shape memory alloy material.

[0011] The fishbone-like structure has a hollow cross-section, with the fishbone portion being hollow.

[0012] The weakened steel plate damper is an I-shaped steel plate structure. Multiple elongated holes are opened in the middle of the I-shaped steel plate structure. It also includes constraint plates set on both sides of the I-shaped steel plate structure. The constraint plates on both sides are connected by bolts. The upper part of the I-shaped steel plate structure is connected to the ear plate by bolts, and the bottom is connected to the foundation platform by bolts.

[0013] Each ear plate is connected to the foundation abutment via multiple steel strands.

[0014] A square-shaped limiting plate is also pre-embedded on the foundation platform, and the steel pipe recycled concrete column is attached to the inner wall of the limiting plate.

[0015] The beneficial effects of this invention are:

[0016] (1) By combining energy-dissipating components, mainly steel strands and weakened steel plate dampers, the structure can drive the dampers to dissipate energy under earthquake action and can achieve self-reset under the tension of steel strands, thereby improving the seismic performance under strong earthquakes and reducing the damage to column base nodes.

[0017] (2) The present invention uses fishbone blocks at the joint between the column and the beam. The fishbone blocks reduce the cross-sectional area so that the plastic hinge can appear in the weakened part, reducing the damage to the column end and other areas of the beam-column joint. The fishbone blocks can be replaced in time after being damaged, so that the structure can still work normally after the earthquake.

[0018] (3) The prestressing tendons are post-tensioned prestressing tendons, which do not require fixed platform equipment and are not limited by location. The prestress provides initial stiffness, so that the steel pipe recycled concrete columns and beams can maintain an elastic state during minor earthquakes, while also supporting the self-weight of the fishbone blocks.

[0019] (4) All major energy dissipation devices are bolted to the outside of the structure. If the energy dissipation devices are damaged after an earthquake, they can be quickly replaced. All components of the entire beam-column joint and column base joint are replaceable. The number, size, shape, and position of the fishbone blocks can be adjusted according to the actual situation. This structure has a clear stress distribution and reliable force transmission. It also has the characteristics of being able to replace segments and quickly restore the structure after being damaged by a strong earthquake, thus solving the problem of traditional frame structures being difficult to repair after earthquake damage and having a long repair cycle.

[0020] (5) The beam-column joint adopts the concept of graded energy dissipation design, which has different energy dissipation modes under different earthquake magnitudes. This avoids the problem that a single energy dissipation component cannot guarantee the safety of the structure in traditional seismic design, or that multiple energy dissipation components participate in the work at the same time regardless of earthquake magnitude, resulting in design waste.

[0021] (6) All components of this invention can be manufactured in the factory and assembled on-site. By pre-drilling holes in the structure, each component can be connected to the frame through pre-set connection holes, thereby reducing the requirements for on-site operations and shortening the construction period. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the functionally recoverable steel pipe recycled concrete frame structure with replaceable connection nodes according to the present invention.

[0023] Figure 2 This is a schematic diagram of the column base structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the ear plate structure in this invention;

[0025] Figure 4 This is a schematic diagram of the external structure of the beam-column joint in this invention;

[0026] Figure 5 This is a schematic diagram of the L-shaped connecting plate in this invention;

[0027] Figure 6 This is a schematic diagram of the internal structure of the beam-column joint in this invention;

[0028] Figure 7 This is a schematic diagram of the rotating shaft structure in this invention;

[0029] Figure 8 This is a schematic diagram of the weakened steel plate damper structure in this invention;

[0030] Figure 9 This is a schematic diagram of the energy dissipation plate structure in the weakened steel plate damper of this invention.

[0031] Among them, 1. foundation cap, 2. steel strand, 3. weakened steel plate damper, 4. ear plate, 5. steel pipe recycled concrete column, 6. prestressed tendon, 7. L-shaped connecting plate, 8. rotating support rod, 9. fishbone block, 10. steel beam. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] The replaceable connection nodes of this invention enable the restoration of steel pipe recycled concrete frames, such as... Figure 1 As shown, it includes two steel pipe recycled concrete columns 5, a steel beam 10, and two foundation caps 1, wherein the steel pipe recycled concrete columns 5 and the foundation caps 1 form a column foot node, and the steel pipe recycled concrete columns 5 and the steel beams 10 form a beam-column node.

[0035] like Figure 2 As shown, the connection relationship at the column base node is as follows: each side of the steel pipe recycled concrete column 5 is connected to the bottom of the ear plate 4, and the ear plate 4 is as follows: Figure 3 As shown, each steel-tube recycled concrete column 5 is connected to the foundation cap 1 at its bottom and also includes multiple weakened steel plate dampers 3. Each weakened steel plate damper 3 is connected to the foundation cap 1 and the ear plate 4 by bolts. During an earthquake, the steel-tube recycled concrete column 5 causes the ear plate 4 and the weakened steel plate damper 3 to deform and dissipate energy, mainly utilizing the plastic deformation of the weakened steel plate damper 3 for energy dissipation.

[0036] like Figure 4 As shown, the connection relationship at the beam-column joint is as follows: Multiple prestressing tendons 6 are bolted to the upper part of each steel pipe recycled concrete column 5 and the end of the steel beam 10. Each prestressing tendon 6 is connected to a herringbone block 9. An L-shaped connecting plate 7 is also connected between the upper part of each steel pipe recycled concrete column 5 and the end of the steel beam 10. The structure of the L-shaped connecting plate 7 is as follows: Figure 5 As shown. Among them, the prestressed tendon 6 can ensure the initial stiffness of the beam-column joint. Its purpose is to ensure that the steel pipe recycled concrete column 5 and the steel beam 10 can maintain an elastic state during minor and moderate earthquakes. At the same time, it plays the role of supporting the self-weight of the fishbone block 9. The prestressing force of its tensioning meets the normal use requirements of the structure in non-seismic design.

[0037] Among them, the L-shaped connecting plate 7 serves as a shear-resistant connection.

[0038] The weakened steel plate dampers and connectors in the frame are all bolted together, which can be replaced in time when they fail due to earthquake damage, effectively reducing the maintenance cost of the frame and extending its service life.

[0039] Example 2

[0040] In this embodiment, as Figure 6 , Figure 7 As shown, a rotating support rod 8 is connected between the upper part of each steel pipe recycled concrete column 5 and the end of the steel beam 10. The rotating support rod 8 rotates to drive the steel beam 10 and other components to swing up and down to consume seismic energy, providing energy dissipation during moderate and major earthquakes. Through the concept of graded energy dissipation design, there are different energy dissipation modes under different earthquake magnitudes, avoiding the problem that a single energy dissipation component in traditional seismic design cannot guarantee the safety of the structure, or that multiple energy dissipation components participate in the work at the same time regardless of earthquake magnitude, resulting in design waste.

[0041] The rotating support rod 8 includes an inner support rod connected at one end to the upper part of the steel pipe recycled concrete column 5, and an outer support rod connected at one end to the steel beam 10. The other end of the inner support rod is connected to the other end of the outer support rod via a pin. When the steel beam 10 or the steel pipe recycled concrete column 5 vibrates, the inner and outer support rods can rotate relative to each other, achieving the effect of energy dissipation.

[0042] Example 3

[0043] In this embodiment, as Figure 4 As shown, the fishbone block 9 is threaded onto the prestressed tendon 6. Each fishbone block 9 is fixed by at least two sets of prestressed tendons 6. The fishbone block 9 can deform when squeezed by the steel beam 10 and the steel pipe recycled concrete column 5. It is made of shape memory alloy material and can quickly recover after deformation.

[0044] The form of the fishbone block 9 can be flexibly designed and adjusted according to different requirements. The fishbone block 9 has a fishbone-like structure with a hollow cross-section for the fishbone portion. The force-transmitting part is retained in the middle. On the one hand, this reduces the self-weight of the fishbone block and saves materials. On the other hand, by weakening the cross-section, the failure occurs first at the weakened section, protecting other critical structures. When the fishbone block 9 is damaged, it can be removed and replaced in time, ensuring that the component can quickly restore its usability after the earthquake.

[0045] like Figure 8 , Figure 9As shown, the weakened steel plate damper 3 is an I-shaped steel plate structure. Multiple elongated holes are opened in the middle of the I-shaped steel plate structure. It also includes constraint plates set on both sides of the I-shaped steel plate structure. The constraint plates on both sides are connected by bolts. The upper part of the I-shaped steel plate structure is connected to the ear plate 4 by bolts, and the bottom is connected to the foundation platform 1 by bolts. The constraint plates can restrain the weakened steel plate damper 3. The weakened steel plate damper 3 serves to connect the steel pipe recycled concrete column 5 and the foundation platform 1. When an earthquake occurs, the steel pipe recycled concrete column 5 causes the ear plate 4 and the damper 3 and steel strand 2 on it to deform and dissipate energy. The energy is mainly dissipated by the plastic deformation of the weakened steel plate damper 3, and the tension of the steel strand 2 enables the frame to have the ability to swing and self-reset.

[0046] Each ear plate 4 is connected to the foundation cap 1 through multiple steel strands 2. The steel strands 2, as an energy dissipation component, can deform and dissipate energy under external force. Under earthquake action, the steel strands 2 can drive the weakened steel plate damper 3 to dissipate energy and can achieve self-resetting under the tension of the steel strands 2, thereby improving the seismic performance under strong earthquakes and reducing the damage to the column base joint.

[0047] A square-shaped limiting plate is also pre-embedded on the foundation cap 1. The steel pipe recycled concrete column 5 is attached to the inner wall of the limiting plate, which can play an initial limiting role for the steel pipe recycled concrete column 5.

[0048] One end of the rotating support rod 8 is prefabricated and connected to one end of the steel beam. Similarly, the other end of the rotating support rod 8 is connected to the other end of the steel beam. The middle hole of the rotating support rod 8 is fixed by a pin.

[0049] This invention features replaceable connection nodes, enabling the restoration of a steel-tube recycled concrete frame with advantages such as earthquake resistance and environmental friendliness. It mainly consists of frame beam-column connection nodes and frame column base connection nodes. The working principle is as follows:

[0050] At the beam-column joint, during minor earthquakes, the prestressed steel reinforcement 6 provides initial stiffness, ensuring the steel beam remains elastic during minor earthquakes. During moderate earthquakes, the herringbone blocks 9 undergo plastic deformation to dissipate energy. During major earthquakes, the steel beam 10 drives the rotating support rod 8 to rotate up and down, causing the herringbone blocks 9 and prestressed steel reinforcement 6 to deform, dissipating seismic energy. If the herringbone blocks 9 are damaged under seismic action, they can be inspected and replaced in a timely manner. At the column base joint, during an earthquake, the steel pipe recycled concrete column 5 causes the ear plate 4 and its weakened steel plate damper 3 and steel strand 2 to deform and dissipate energy. Energy dissipation is mainly achieved through the plastic deformation of the dampers, and the tension of the steel strands enables the frame to have a swaying self-resetting ability.

[0051] Through the above method, the functional restoration of the replaceable connection node of the steel pipe recycled concrete frame of the present invention is achieved by setting energy dissipation and reset devices at the connection between the steel pipe recycled concrete column foot and the foundation (frame column foot node) and the connection between the steel pipe recycled concrete column and the steel beam (frame beam-column node), so that the components can dissipate the impact energy of the earthquake during the earthquake and reduce the damage to the node when the earthquake occurs.

Claims

1. A reusable steel pipe recycled concrete frame with replaceable connection nodes, characterized in that, It includes two square-section steel pipe recycled concrete columns (5) and a steel beam (10) located between the two steel pipe recycled concrete columns (5). Each side of the steel pipe recycled concrete column (5) is connected to an ear plate (4) at the bottom. The bottom of each steel pipe recycled concrete column (5) is connected to a foundation platform (1). It also includes multiple weakened steel plate dampers (3). Each weakened steel plate damper (3) is connected to the foundation platform (1) and the ear plate (4) by bolts. Multiple prestressing tendons (6) are bolted to the upper part of each steel pipe recycled concrete column (5) and the end of the steel beam (10). A fishbone block (9) is connected to each prestressing tendon (6). An L-shaped connecting plate (7) is also connected between the upper part of each steel pipe recycled concrete column (5) and the end of the steel beam (10).

2. The functionally recoverable steel pipe recycled concrete frame according to claim 1, characterized in that, Each steel pipe recycled concrete column (5) is also connected to a rotating support rod (8) between its upper part and the end of the steel beam (10).

3. The functionally recoverable steel pipe recycled concrete frame according to claim 2, characterized in that, The rotating support rod (8) includes an inner support rod with one end connected to the upper part of the steel pipe recycled concrete column (5), and an outer support rod with one end connected to the steel beam (10). The other end of the inner support rod is connected to the other end of the outer support rod through a pin.

4. The functionally recoverable steel pipe recycled concrete frame according to claim 1, characterized in that, The fishbone block (9) is made of shape memory alloy material.

5. The functionally recoverable steel pipe recycled concrete frame according to claim 1, characterized in that, The fishbone block (9) has a fishbone-like structure, and the fishbone part has a hollow cross section.

6. The functionally recoverable steel pipe recycled concrete frame according to claim 1, characterized in that, The weakened steel plate damper (3) is an I-shaped steel plate structure. Multiple elongated holes are opened in the middle of the I-shaped steel plate structure. It also includes constraint plates set on both sides of the I-shaped steel plate structure. The constraint plates on both sides are connected by bolts. The upper part of the I-shaped steel plate structure is connected to the ear plate (4) by bolts, and the bottom is connected to the foundation platform (1) by bolts.

7. The functionally recoverable steel pipe recycled concrete frame according to claim 1, characterized in that, Each of the ear plates (4) is connected to the foundation pile (1) by multiple steel strands (2).

8. The functionally recoverable steel pipe recycled concrete frame according to claim 1, characterized in that, A square-shaped limiting plate is also pre-embedded on the foundation platform (1), and the steel pipe recycled concrete column (5) is attached to the inner wall of the limiting plate.

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