Self-resetting inclined strut type hollow sandwich steel pipe concrete lattice column and construction method

Abstract

This invention discloses a self-resetting inclined bracing hollow-core steel-concrete composite column and its construction method. The column comprises a hollow-core steel-concrete composite column, horizontal connecting tubes, and self-resetting inclined bracing. The hollow-core steel-concrete composite column and the horizontal connecting tubes are connected by unidirectional expansion bolts. After connection, the gap between the arc-shaped plate with bolt holes and the outer steel pipe can be reinforced by welding. The self-resetting inclined bracing is connected to the horizontal connecting tubes by high-strength bolts. This invention utilizes prefabrication and assembly technology, resulting in high construction efficiency and excellent fire resistance. Furthermore, the self-weight can be reduced and seismic performance improved by adjusting the hollowness ratio of the column limbs. In addition, the self-resetting inclined bracing provides recoverability, specifically through the energy dissipation capacity provided by the sliding friction between the wedge-shaped rod and the outer cover plate, and the reset capacity provided by the elastic deformation of the disc spring. This serves as the first line of defense, ensuring the overall structure resets under minor earthquakes, with residual deformation approaching zero. Under moderate and major earthquakes, it can delay column failure and reduce post-earthquake residual deformation.

Description

Technical Field

[0001] This invention belongs to the field of vibration reduction technology for engineering structures, and specifically relates to a self-resetting inclined bracing hollow sandwich steel tube concrete lattice column and its construction method. Background Technology

[0002] Lattice columns are a common type of engineering structural component, consisting of column legs and connecting members. The column legs are typically made of materials such as shaped steel or steel pipes, while the connecting members serve to connect the column legs, ensure their coordinated function, and improve the overall stability of the structure. With the expansion of building scale and the increasing complexity of structural forms, higher demands are placed on the load-bearing capacity, stability, and economy of structural components. While solid-web columns possess good integrity and bending resistance, large column cross-sections can lead to material waste and increased structural weight. Lattice columns, through the rational arrangement of column legs and connecting members, can effectively reduce structural weight, improve material utilization, and lower project costs while ensuring structural load-bearing capacity. Currently, lattice columns have been widely applied and researched in the engineering field. In terms of materials, new composite materials such as steel-concrete composites are increasingly being adopted. In terms of design theory, numerical simulation and experimental research have provided a more scientific basis for their design and application. Although existing lattice columns have achieved certain application results in engineering, some shortcomings still exist. Regarding seismic performance: Under earthquake loads, traditional lattice columns have limited energy dissipation capacity, are prone to damage, and exhibit significant residual deformation after an earthquake. In moderate to strong earthquakes, the columns may suffer severe damage or even lose their load-bearing capacity. Regarding self-weight and durability: Some lattice columns, due to the use of solid cross-sections or inappropriate material selection, have a high structural self-weight, increasing the burden on the foundation. Regarding construction and maintenance: The construction process of traditional lattice columns is complex, requiring extensive on-site welding and assembly, resulting in long construction periods and difficulty in guaranteeing quality. Moreover, during the structural service life, repair and replacement are difficult once localized damage occurs, leading to high total life-cycle costs. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention aims to provide a self-resetting inclined bracing hollow-core steel-tube concrete lattice column and its construction method. The designed self-resetting inclined bracing has energy dissipation and self-resetting functions. Under low-cycle cyclic loads, the disc springs in the self-resetting inclined bracing provide a large preload, and the energy dissipation module in the bracing dissipates seismic energy, reducing post-earthquake lateral residual displacement and improving the seismic performance of the building structure. To reduce material consumption and structural weight, the column limbs are made of hollow-core steel-tube concrete. The sandwich concrete portion can be made of high-performance concrete or ultra-high-performance concrete. High-performance concrete increases the load-bearing capacity of the column limbs while increasing the hollowness of the steel tubes, further reducing the weight and effectively improving the column's durability, fire resistance, and seismic performance. To shorten the construction period, improve construction efficiency, and reduce later repair costs for replaceable components, prefabrication assembly technology is adopted. It features high efficiency, quality control, strong environmental adaptability, energy saving and environmental protection, high flexibility, safety and reliability, and excellent economy.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A self-resetting inclined bracing hollow sandwich steel tube concrete lattice column includes a hollow sandwich steel tube concrete column, horizontal ducts and self-resetting inclined bracing. The self-resetting diagonal brace includes a wedge-shaped rod with bolt sliding holes, an outer cover plate with one bolt hole, a high-strength bolt, a disc spring, a high-strength nut, and a diagonal brace end plate with bolt holes; the wedge-shaped rod is obliquely arranged, and its two ends are connected to the connection node between the hollow sandwich steel tube concrete column and the horizontal pipe through the diagonal brace end plate; there are two outer cover plates, which are respectively aligned with and fitted into the upper and lower edges of the wedge-shaped rod; The disc spring is placed at one of the bolt holes of each outer cover plate. A high-strength bolt passes through the disc spring on one side of the wedge bar, the bolt hole of the outer cover plate, the bolt sliding hole of the wedge bar, the bolt hole of the outer cover plate on the other side of the wedge bar, the disc spring, and the high-strength nut in sequence, and then applies a predetermined torque to fix the high-strength nut.

[0005] In one embodiment, the hollow steel-concrete composite column includes a base plate with bolt holes, an inner steel pipe, an outer steel pipe, stiffening ribs, high-performance concrete, and a top plate with bolt holes; the inner and outer steel pipes are coaxially arranged between the base plate and the top plate, the high-performance concrete is poured between the inner and outer steel pipes and vibrated to compact it, bolt holes are reserved at the joints, and the stiffening ribs are set at the connection between the top end of the outer steel pipe and the top plate, and at the connection between the bottom end of the outer steel pipe and the base plate.

[0006] In one embodiment, the transverse bracing tube includes an arc-shaped plate with two bolt holes, a steel pipe, a steel plate connector with bolt holes, expansion bolts, and two high-strength bolts. There are two arc-shaped plates, with the back of the arc connected to both ends of the steel pipe and the front of the arc attached to the precast hollow sandwich steel pipe concrete column. The steel plate connector is connected to the back of the arc of one end of the arc-shaped plate and the outer wall of one end of the steel pipe, and is used to connect to the diagonal bracing end plate by the two high-strength bolts.

[0007] In one embodiment, the arc-shaped plate is cut from a steel pipe with an inner diameter equal to the outer diameter of the precast hollow steel-concrete composite column by measuring the outer diameter of the precast hollow steel-concrete composite column. The arc-shaped plate is attached to the precast hollow steel-concrete composite column, and the number and position of the bolt holes correspond to the bolt holes at the column joints. The hollow steel-concrete composite column and the horizontal pipe are connected and fixed at the joint by passing through the bolt holes with multiple rows of radial high-strength bolts or expansion bolts. Welding reinforcement is used to fill the gap between the edge of the arc-shaped plate and the column joint.

[0008] In one embodiment, the transverse tube further includes a trapezoidal plate, which is connected to the arcuate back of the arcuate plate at the other end and the outer wall of the other end of the steel tube.

[0009] In one embodiment, the steel plate connector is welded from two square steel plates and one trapezoidal steel plate. The square steel plates have two pairs of bolt holes, which are aligned with the bolt holes on the diagonal brace end plate.

[0010] In one embodiment, the wedge bar is cut from steel and has a bolt sliding hole in the middle. The length direction of the bolt sliding hole is the length direction of the self-resetting diagonal brace, and the length is determined according to actual performance requirements. The wedge bar has a conical structure on both sides of the bolt sliding hole. The conical structure has a sloped surface on the side closer to the bolt sliding hole, and the thickness of the sloped surface gradually increases in the direction away from the bolt sliding hole.

[0011] In one embodiment, the slope of the sloped surface is 10.

[0012] In one embodiment, the number of bolt holes is determined by the length of the self-resetting brace. The top of the outer cover plate is a smooth surface, which facilitates the placement of the disc spring. Its inner surface is tightly fitted with the conical structure, and a friction plate is added between the two surfaces.

[0013] This invention also provides a construction method for the aforementioned self-resetting inclined bracing hollow sandwich steel tube concrete lattice column, comprising the following steps: S1, prefabricated hollow-core steel-concrete composite columns in the factory; S2, In the factory, the steel plate connectors are welded to the arc plate, and the resulting assembly is welded to the steel pipe to complete the prefabrication of the horizontal pipe; S3, at the factory, the disc spring is placed at one of the bolt holes, the wedge rod is aligned and fitted with the outer cover plate, and a high-strength bolt passes through the disc spring on one side of the wedge rod, the bolt hole on the outer cover plate, the bolt sliding hole on the wedge rod, the bolt hole on the outer cover plate on the other side of the wedge rod, and the disc spring in sequence. The diagonal brace end plate is then welded to the wedge rod and finally fixed with a high-strength nut. The initial preload of the disc spring is adjusted according to the site requirements to ensure that no initial misalignment occurs and to prevent loss of preload, thereby completing the assembly of the self-resetting diagonal brace. S4, on site, align the bolt holes 2 of the arc plate in the precast component completed in S2 with the bolt holes reserved at the node of the precast hollow steel pipe concrete column. The expansion bolts are then passed through bolt hole 2 and the node bolt holes of the precast hollow steel pipe concrete column in sequence. Finally, welding reinforcement is carried out. The remaining nodes are assembled and fixed according to the above steps to complete the connection and fixation of the horizontal pipe and the double-limb column of the hollow steel pipe concrete column. S5. On site, align the bolt holes of the end plates of the self-resetting brace with the bolt holes of the steel plate connector, and then use high-strength bolts to connect and fix them. Follow the above steps to complete the installation of the remaining self-resetting braces. S6. On-site, after the self-resetting inclined bracing hollow sandwich steel tube concrete lattice column is hoisted to the predetermined position, the base plate with bolt holes at the column foot is connected to the pre-embedded foundation with bolts. Thus, all construction procedures of the self-resetting inclined bracing hollow sandwich steel tube concrete lattice column are completed.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention exhibits excellent seismic performance and is reversible. Under minor earthquakes, the overall structure remains in an elastic state. Under moderate and major earthquakes, the self-resetting brace acts as the first line of defense against seismic damage. The disc springs in the self-resetting brace provide a large preload. When the outer cover plate with bolt holes and the wedge rod with bolt sliding holes slip relative to each other, the disc springs on the self-resetting brace apply preload to provide sufficient restoring force, allowing the structure to return to its original state after unloading, thereby effectively reducing residual deformation after the earthquake. The self-resetting brace energy dissipates seismic energy through friction between the outer cover plate with bolt holes and the wedge rod with bolt sliding holes, delaying the original damage area of ​​the hollow steel tube concrete lattice column. The self-resetting brace, through the coordinated work of the energy dissipation system and the reset system, reduces the external load and seismic input energy borne by the column base of the hollow steel tube concrete lattice column, realizing the reversible function of the hollow steel tube concrete lattice column after the earthquake, thereby reducing residual lateral deformation after the earthquake.

[0015] This invention features lightweight construction and excellent fire resistance. In hollow-core steel-tube concrete lattice columns, the interlayer concrete portion can utilize high-performance concrete. High-performance concrete increases the column's load-bearing capacity while simultaneously increasing the hollowness of the steel tubes, further reducing weight and effectively improving the column's durability and fire resistance.

[0016] This invention offers high construction efficiency. Components are prefabricated in the factory and quickly assembled on-site, significantly improving construction efficiency and reducing costs. Furthermore, this invention is not limited to a specific type of restoring energy dissipation brace; other restoring energy dissipation braces can be substituted for those used in this invention, depending on the application scenario, node distance, and the length of the restoring energy dissipation brace. When using other types of restoring energy dissipation braces, the connection nodes should be adapted according to their structural characteristics and mechanical properties. If the selected restoring energy dissipation brace is a buckling-restrained brace, it typically consists of a core energy dissipation unit, a restraint unit, and connecting components. When applied to hollow-core steel-concrete composite lattice columns of this invention, the inclined brace end plates with bolt holes and the steel plate connectors with bolt holes need to be redesigned. The thickness and strength of the end plates can be increased to withstand the larger axial forces generated by the buckling-restrained brace during energy dissipation; simultaneously, the shape and size of the steel plate connectors should be optimized to make the connection with the buckling-restrained brace tighter and more stable. High-strength bolt groups can be used for connection, with reinforcing ribs around the bolt holes to improve the shear and bending resistance of the connection nodes. If friction-based energy dissipation supports are used, energy is primarily dissipated through the relative sliding between the friction surfaces. In this case, specialized friction devices, such as friction plates and pre-tightening bolts, need to be installed at the connection points. The friction plates are installed between the end plate of the inclined brace with bolt holes and the end of the friction-based energy dissipation support, and a certain pre-tightening force is applied by the bolts to ensure that the friction plates can generate stable frictional force under earthquake or wind loads. Simultaneously, the connection between the hollow-core steel-concrete composite column and the transverse duct is strengthened to ensure the overall stability of the structure.

[0017] Furthermore, for cases employing different repositioning energy dissipation supports, the overall mechanical performance of the structure needs to be reassessed. Using methods such as finite element analysis, the structure's response under different loads, such as displacement, internal forces, and energy dissipation capacity, should be calculated to ensure that the hollow-core steel-concrete composite lattice column, even with alternative repositioning energy dissipation supports, still meets design requirements and safety standards. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of a self-resetting inclined bracing hollow sandwich steel tube concrete lattice column according to the present invention.

[0019] Figure 2 This is a three-dimensional schematic diagram of a self-resetting inclined bracing hollow sandwich steel tube concrete lattice column according to the present invention.

[0020] Figure 3 This is a three-dimensional schematic diagram of a precast hollow-core steel-concrete composite column.

[0021] Figure 4 This is a three-dimensional schematic diagram of the horizontally attached tube.

[0022] Figure 5It is a plan view of the arc-shaped plate in the horizontal pipe.

[0023] Figure 6 This is a plan view of the connecting plate at the middle end of the horizontal pipe.

[0024] Figure 7 This is a three-dimensional schematic diagram of the self-resetting diagonal brace.

[0025] Figure 8 This is a three-dimensional schematic diagram of the wedge-shaped rod in a self-resetting diagonal brace.

[0026] Figure 9 This is a three-dimensional schematic diagram of the outer cover plate in the self-resetting diagonal brace.

[0027] Figure 10 This is a three-dimensional schematic diagram of the hoisting of precast hollow steel-concrete composite columns at the construction site.

[0028] Figure 11 This is a three-dimensional schematic diagram of the horizontal pipe hoisting at the construction site.

[0029] Figure 12 This is a three-dimensional schematic diagram of the self-resetting diagonal bracing being hoisted at the construction site.

[0030] Figure 13 This is a three-dimensional schematic diagram of an industrial plant building using the self-resetting inclined bracing hollow sandwich steel tube concrete lattice column of this invention. Detailed Implementation

[0031] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings and examples.

[0032] like Figure 1 and Figure 2 As shown, the self-resetting inclined bracing hollow steel-concrete composite lattice column of the present invention comprises three parts: a hollow steel-concrete composite column 1, a horizontal connecting tube 2, and a self-resetting inclined brace 3. The hollow steel-concrete composite column 1 and the horizontal connecting tube 2 are interconnected, forming column joint nodes at the connection points. The self-resetting inclined brace 3 is an inclined structure, connecting the column joint nodes of different longitudinal directions in the upper and lower layers. In this invention, only one self-resetting inclined brace 3 needs to be connected between the four column joint nodes in the upper and lower layers. Preferably, the self-resetting inclined brace 3 is distributed in a regularly bent shape between the multiple layers, as shown in the distribution pattern. Figure 1 and Figure 2 .

[0033] like Figure 3As shown, the hollow-core steel-concrete composite column 1 includes a base plate 1.1 with bolt holes, an inner steel pipe 1.2, an outer steel pipe 1.3, stiffening ribs 1.4, high-performance concrete 1.5, and a top plate 1.6 with bolt holes. The inner steel pipe 1.2 and the outer steel pipe 1.3 are arranged coaxially. The high-performance concrete 1.5 is poured between the inner and outer steel pipes and compacted by vibration to form a hollow-core structure. The inner steel pipe 1.2 and the outer steel pipe 1.3 are welded at the top and bottom ends through the top plate 1.6 and the base plate 1.1, respectively, with bolt holes reserved at the joints. In actual engineering, the self-weight can be reduced and the seismic performance improved by adjusting the hollowness ratio of the column members.

[0034] like Figure 4 As shown, the horizontal connecting pipe 2 includes an arc-shaped plate 2.1 with bolt holes 2.1.1, a steel pipe 2.2, a steel plate connector with bolt holes 2.3, a trapezoidal plate 2.4, expansion bolts 2.5, and high-strength bolts 2.6. like Figure 5 As shown, the arc plate 2.1 is cut from a steel pipe with an inner diameter equal to that of the column limb 1 by measuring the outer diameter of the precast hollow sandwich steel pipe concrete column 1. Four pairs of bolt holes 2.1.1 are provided on it, corresponding to the bolt holes at the nodes of the precast hollow sandwich steel pipe concrete column 1.

[0035] like Figure 6 As shown, the steel plate connector 2.3 is welded from two square steel plates and one trapezoidal steel plate. There are two pairs of bolt holes on the square steel plates, and the holes are aligned with the bolt holes on the end plate 3.6 of the self-resetting diagonal brace 3 with bolt holes, which facilitates subsequent bolt fixing.

[0036] like Figure 7As shown, the self-resetting diagonal brace 3 includes a wedge-shaped rod 3.1 with bolt sliding holes 3.1.1, an outer cover plate 3.2 with bolt holes 3.2.1, high-strength bolts 3.3, a disc spring 3.4, a high-strength nut 3.5, and a diagonal brace end plate 3.6. The wedge-shaped rod 3.1 is the main structural component, diagonally connecting the beam-column nodes in different vertical directions on the upper and lower floors. Its two ends are connected to the diagonal brace end plates 3.6, which connect to the nodes. Specifically, the diagonal brace end plates 3.6 are connected to the steel plate connector 2.3 and bolts. There are two outer cover plates 3.2, aligned and fitted onto the upper and lower edges of the wedge-shaped rod 3.1. They provide energy dissipation through sliding friction with the wedge-shaped rod. Here, "upper" and "lower" refer to the diagonal direction. Bolt holes 3.2.1 are provided on the surface of the outer cover plate 3.2. Disc spring 3.4 is placed at bolt hole 3.2.1. High-strength bolt 3.3 passes sequentially through disc spring 3.4 on the upper side of wedge rod 3.1, bolt hole 3.2.1 on the outer cover plate 3.2 on the upper side of wedge rod 3.1, bolt sliding hole 3.1.1 on wedge rod 3.1, bolt hole 3.2.1 on the outer cover plate 3.2 on the lower side of wedge rod 3.1, disc spring 3.4 on the lower side of wedge rod 3.1, and high-strength nut 3.5. A predetermined torque is applied to the high-strength nut 3.5 for fixation. The elastic deformation of disc spring 3.4 provides the reset capability. There are multiple disc springs 3.4. As the first line of defense, they ensure the overall structure resets under small earthquakes, with residual deformation approaching zero. Under moderate and large earthquakes, they can delay column damage and reduce post-earthquake residual deformation.

[0037] like Figure 8 As shown, the wedge-shaped rod 3.1 is cut from steel and has a bolt sliding hole 3.1.1 in the middle. The specific length of the bolt sliding hole 3.1.1 is determined according to actual performance requirements, and its length direction is the same as the length direction of the wedge-shaped rod 3.1, and also the length direction of the self-resetting brace 3. Along this length direction, symmetrically arranged on both sides of the bolt sliding hole 3.1.1, a conical structure is provided. The surface of this conical structure near the bolt sliding hole 3.1.1 is a slope surface 3.1.2, and along the direction away from the bolt sliding hole 3.1.1, it is in an "uphill" state. For example, its slope is 10°. When the two ends of the self-resetting brace are subjected to force, the disc spring 3.4 is compressed, and the force acts on the outer cover plate 3.2 and is transmitted to the wedge-shaped rod 3.1.2. When the slope surface 3.1.2 of the wedge-shaped rod slips, it causes the wedge-shaped rod 3.1 to return to its original position.

[0038] like Figure 9 As shown, the number of bolt holes 3.2.1 on the outer cover plate 3.2 is determined by the length of the self-resetting diagonal brace 3; the greater the length, the more holes there are. The top of the outer cover plate is a smooth surface 3.2.2, which facilitates the placement of the disc spring 3.4. In addition, the inner surface of the outer cover plate 3.2 fits tightly with the conical surface of the wedge-shaped rod, and a friction plate made of materials such as brass or aluminum can be added between the two surfaces according to performance requirements.

[0039] The prefabrication and assembly construction of hollow steel tube concrete lattice columns mainly consists of the following steps: like Figure 3 , Figure 10 As shown, the precast hollow-core steel-concrete composite column 1 is constructed as follows: First, the inner steel pipe 1.2 with several pre-drilled bolt holes is welded to the base plate 1.1 with bolt holes. Then, the outer steel pipe 1.3 with several pre-drilled bolt holes is welded to the base plate 1.1 with bolt holes. High-performance concrete 1.5 is poured into the steel pipe sandwich and vibrated until compacted. The top plate 1.6 with bolt holes is welded to the outer steel pipe 1.3 and to the inner steel pipe 1.2. Then, stiffening ribs 1.4 are welded. After curing, the precast hollow-core steel-concrete composite column 1 is completed.

[0040] like Figure 7 As shown, the prefabricated horizontal pipe 2 is constructed by welding the steel plate connector 2.3 with bolt holes at one end and the trapezoidal plate 2.4 with bolt holes to the arc plate 2.1, and then welding the assembly to the steel pipe 2.2 to complete the prefabrication of the horizontal pipe 2.

[0041] like Figure 4 As shown, the self-resetting diagonal brace 3 is assembled as follows: The disc spring 3.4 is placed at bolt hole 3.2.1 of the outer cover plate 3.2 with bolt holes. The wedge rod 3.1 with bolt sliding holes is aligned and fitted with the outer cover plate 3.2 with bolt holes. High-strength bolts 3.3 are respectively connected through the disc spring 3.4, bolt hole 3.2.1 of the outer cover plate 3.2 with bolt holes, bolt sliding hole 3.1.1 of the wedge rod 3.1 with bolt sliding holes, bolt hole 3.2.1 of the outer cover plate 3.2 with bolt holes, and the disc spring 3.4. The diagonal brace end plate 3.6 with bolt holes is welded to the wedge rod 3.1 with bolt sliding holes. Finally, it is fixed with a high-strength nut 3.5. The initial preload of the disc spring 3.4 is adjusted according to site requirements to ensure no initial misalignment and prevent preload loss, thus completing the assembly of the self-resetting diagonal brace 3.

[0042] like Figure 11 As shown, the connection and fixation between the horizontal duct 2 and the double-limb column of the hollow sandwich steel tube concrete column 1 is as follows: After aligning the bolt hole 2.1.1 of the arc plate 2.1 with bolt holes in the prefabricated horizontal duct 2 with the bolt hole reserved at the node of the prefabricated hollow sandwich steel tube concrete column 1, the expansion bolts 2.5 pass through the bolt hole 2.1.1 of the arc plate 2.1 and the node bolt hole of the prefabricated hollow sandwich steel tube concrete column 1 in sequence. Finally, the gap between the edge of the arc plate 2.1 and the column limb is reinforced by welding, and the remaining nodes are assembled and fixed according to the above steps.

[0043] like Figure 12As shown, the installation of the self-resetting diagonal brace 3 is as follows: The diagonal brace end plate 3.6 with bolt holes is aligned with the bolt holes of the steel plate connector 2.3 at both ends of the self-resetting diagonal brace 3, and then fixed with high-strength bolts. The remaining self-resetting diagonal braces 3 are then installed in accordance with the above steps.

[0044] like Figure 13 As shown, the installation of the self-resetting inclined bracing hollow sandwich steel tube concrete lattice column is as follows: After the self-resetting inclined bracing hollow sandwich steel tube concrete lattice column is hoisted to the predetermined position, the base plate 1.1 with bolt holes at the column foot is connected to the pre-embedded foundation by bolts. Thus, all construction procedures of the self-resetting inclined bracing hollow sandwich steel tube concrete lattice column are completed.

[0045] In summary, all three main components of this invention are prefabricated in the factory and then assembled on-site. Specifically, the hollow-core steel-concrete composite column and the horizontal connecting tubes are connected using unidirectional expansion bolts. After connection, the gap between the arc-shaped plate with bolt holes and the outer steel pipe can be reinforced by welding. The self-resetting diagonal brace and the horizontal connecting tubes are connected using high-strength bolts. This invention utilizes prefabrication and assembly technology, resulting in high construction efficiency and excellent fire resistance. Furthermore, the self-weight can be reduced and seismic performance improved by adjusting the hollowness ratio of the hollow-core steel-concrete composite column limbs. In addition, this invention provides recoverability through the self-resetting diagonal brace, specifically through the energy dissipation capacity provided by the sliding friction between the wedge-shaped rod and the outer cover plate, and the reset capacity provided by the elastic deformation of the disc spring. This serves as the first line of defense, ensuring the overall structure resets under minor earthquakes, with residual deformation approaching zero. Under moderate and major earthquakes, it can delay column failure and reduce post-earthquake residual deformation.

[0046] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-resetting inclined bracing hollow sandwich steel tube concrete lattice column, characterized in that, It includes hollow sandwich steel tube concrete column (1), horizontal duct (2) and self-resetting diagonal brace (3); The self-resetting diagonal brace (3) includes a bolted sliding hole ( 3.1.1) includes a wedge-shaped rod (3.1), an outer cover plate (3.2) with bolt holes (3.2.1), a high-strength bolt (3.3), a disc spring (3.4), a high-strength nut (3.5), and a diagonal bracing end plate (3.6) with bolt holes; the wedge-shaped rod (3.1) is obliquely arranged, and its two ends are connected to the connection node between the hollow sandwich steel tube concrete column (1) and the horizontal pipe (2) through the diagonal bracing end plate (3.6); there are two outer cover plates (3.2), which are respectively aligned with and fitted to the upper and lower edges of the wedge-shaped rod (3.1); The disc spring (3.4) is placed at each bolt hole (3.2.1) of each outer cover plate (3.2). The high-strength bolt (3.3) passes sequentially through the disc spring (3.4) on one side of the wedge rod (3.1), the bolt hole (3.2.1) of the outer cover plate (3.2), and the bolt sliding hole of the wedge rod (3.1). 3.1.1) After the bolt hole (3.2.1), disc spring (3.4), and high-strength nut (3.5) on the outer cover plate (3.2) on the other side of the wedge bar (3.1), apply a predetermined torque to fix the high-strength nut (3.5).

2. The self-resetting inclined bracing hollow sandwich steel tube concrete lattice column according to claim 1, characterized in that, The hollow sandwich steel tube concrete column (1) includes a base plate (1.1) with bolt holes, an inner steel tube (1.2), an outer steel tube (1.3), stiffening ribs (1.4), high-performance concrete (1.5), and a top plate (1.6) with bolt holes; the inner steel tube (1.2) and the outer steel tube (1.3) are coaxially arranged between the base plate (1.1) and the top plate (1.6); the high-performance concrete (1.5) is poured between the inner steel tube (1.2) and the outer steel tube (1.3) and vibrated to compact; bolt holes are reserved at the joints; the stiffening ribs (1.4) are set at the connection between the top end of the outer steel tube (1.3) and the top plate (1.6), and at the connection between the bottom end of the outer steel tube (1.3) and the base plate (1.1).

3. The self-resetting inclined bracing hollow sandwich steel tube concrete lattice column according to claim 1, characterized in that, The horizontal bracing tube (2) includes an arc-shaped plate (2.1) with bolt holes (2.1.1), a steel pipe (2.2), a steel plate connector (2.3) with bolt holes, an expansion bolt (2.5), and a high-strength bolt (2.6). There are two arc-shaped plates (2.1), with the back of the arc connected to both ends of the steel pipe (2.2) and the front of the arc attached to the precast hollow sandwich steel pipe concrete column (1). The steel plate connector (2.3) is connected to the back of the arc of one end of the arc-shaped plate (2.1) and the outer wall of one end of the steel pipe (2.2), and is used to connect to the diagonal bracing end plate (3.6) by the high-strength bolt (2.6).

4. The self-resetting inclined bracing hollow sandwich steel tube concrete lattice column according to claim 3, characterized in that, The arc plate (2.1) is cut from a steel pipe with an inner diameter equal to that of the column (1) by measuring the outer diameter of the precast hollow sandwich steel pipe concrete column (1). It is attached to the precast hollow sandwich steel pipe concrete column (1). The number and position of its bolt holes (2.1.1) correspond to the bolt holes at the column node. The hollow sandwich steel pipe concrete column (1) and the horizontal pipe (2) are connected and fixed at the node by passing through the bolt holes (2.1.1) with multiple rows of radial high-strength bolts or expansion bolts (2.5). Welding is used to reinforce the gap between the edge of the arc plate (2.1) and the column.

5. The self-resetting inclined bracing hollow sandwich steel tube concrete lattice column according to claim 3, characterized in that, The horizontal pipe (2) also includes a trapezoidal plate (2.4), which is connected to the arc-shaped back side of the arc plate (2.1) at the other end and the outer wall of the other end of the steel pipe (2.2).

6. The self-resetting inclined bracing hollow sandwich steel tube concrete lattice column according to claim 3, characterized in that, The steel plate connector (2.3) is welded from two square steel plates and one trapezoidal steel plate. There are two pairs of bolt holes on the square steel plates, and the holes are aligned with the bolt holes on the diagonal brace end plate (3.6).

7. The self-resetting inclined bracing hollow sandwich steel tube concrete lattice column according to any one of claims 1 to 6, characterized in that, The wedge-shaped rod (3.1) is cut from steel and has a bolt sliding hole in the middle. 3.1.1), the length direction of the bolt sliding hole (3.1.1) is the length direction of the self-resetting diagonal brace (3), and the length is determined according to the actual performance requirements. The wedge-shaped bar (3.1) has a conical structure on both sides of the bolt sliding hole (3.1.1) in the length direction. The conical structure is located near the bolt sliding hole (3.1.1). One side of 3.1.1) is a slope surface (3.1.2), and the slope surface (3.1.2) gradually increases in thickness in the direction away from the bolt sliding hole (3.1.1).

8. The self-resetting inclined bracing hollow sandwich steel tube concrete lattice column according to claim 7, characterized in that, The slope of the slope surface (3.1.2) is 10.

9. The self-resetting inclined bracing hollow sandwich steel tube concrete lattice column according to claim 7, characterized in that, The number of bolt holes (3.2.1) is determined by the length of the self-resetting diagonal brace (3). The top of the outer cover plate (3.2) is a smooth surface (3.2.2) to facilitate the placement of the disc spring (3.4). Its inner surface is tightly fitted with the conical structure, and a friction plate is added between the two surfaces.

10. The construction method of the self-resetting inclined bracing hollow sandwich steel tube concrete lattice column according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1, in the factory, prefabricated hollow sandwich steel tube concrete column (1). S2, at the factory, the steel plate connector (2.3) is welded to the arc plate (2.1), and the resulting assembly is welded to the steel pipe (2.2) to complete the prefabrication of the horizontal pipe (2); S3, at the factory, the disc spring (3.4) is placed at bolt hole one (3.2.1), the wedge rod (3.1) is aligned and fitted with the outer cover plate (3.2), and the high-strength bolt one (3.3) passes sequentially through the disc spring (3.4) on one side of the wedge rod (3.1), the bolt hole one (3.2.1) of the outer cover plate (3.2), and the bolt sliding hole of the wedge rod (3.1). 3.1.1) Bolt hole 1 (3.2.1) on the outer cover plate (3.2) on the other side of the wedge rod (3.1), disc spring (3.4), and weld the diagonal brace end plate (3.6) to the wedge rod (3.1), and finally fix it with a high-strength nut (3.5); adjust the initial preload of the disc spring (3.4) according to the site requirements to ensure that no initial misalignment occurs and to prevent loss of preload, thereby completing the assembly of the self-resetting diagonal brace (3); S4, on site, align the bolt hole 2 (2.1.1) of the arc plate (2.1) in the precast component completed in S2 with the bolt hole reserved at the node of the precast hollow steel pipe concrete column (1). The expansion bolt (2.5) passes through the bolt hole 2 (2.1.1) and the node bolt hole of the precast hollow steel pipe concrete column (1) in sequence. Finally, weld reinforcement is carried out, and the remaining nodes are assembled and fixed according to the above steps to complete the connection and fixation of the horizontal pipe (2) and the double-limb column of the hollow steel pipe concrete column (1). S5, on site, after aligning the bolt holes of the end plates (3.6) of the self-resetting diagonal brace (3) with the bolt holes of the steel plate connector (2.3), use high-strength bolts (2.6) to connect and fix them, and complete the installation of the remaining self-resetting diagonal brace (3) according to the above steps; S6. On site, after the self-resetting inclined bracing hollow sandwich steel tube concrete lattice column is hoisted to the predetermined position, the base plate (1.1) with bolt holes at the column foot is connected to the pre-embedded foundation with bolts. Thus, all construction procedures of the self-resetting inclined bracing hollow sandwich steel tube concrete lattice column are completed.

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