Assembly type double-core-rod buckling-restrained steel support with inner core I-shaped steel

Abstract

The assembly type double-core-rod buckling-restrained steel support comprises the inner core I-shaped steel, core rods are symmetrically arranged on the upper surface and the lower surface of the I-shaped inner core I-shaped steel in the length direction of the inner core I-shaped steel, and an upper cover plate and a lower cover plate are further arranged on the faces, away from the inner core I-shaped steel, of the upper core rod and the lower core rod. The inner core I-shaped steel, the two core rods, the upper cover plate and the lower cover plate are fixedly connected through bolts, the end face of one end of each core rod is flush with the end face of the corresponding end of the inner core I-shaped steel, a base plate is arranged between the end face flush end of each core rod and the upper surface or the lower surface of the inner core I-shaped steel, and the other end of each core rod extends out of the inner core I-shaped steel. The ends, extending out of the inner core I-shaped steel, of the two core rods are jointly connected with a movable head through bolts a, and base plates are arranged between the core rods and the movable head. The buckling-restrained brace solves the problem that in the prior art, a single-shaped single-core-rod buckling-restrained brace is prone to causing overall instability or local instability of the brace.

Description

Technical Field

[0001] This utility model belongs to the field of building assembly support technology, and relates to a prefabricated double-core anti-buckling steel support for core I-beams. Background Technology

[0002] While traditional buckling-restrained steel braces can increase the lateral stiffness of building structures and reduce structural damage, irregular structures are subject to complex stresses. Ordinary buckling-restrained steel braces have a large slenderness ratio, and once overall instability occurs, the nodes will fail, leading to structural collapse.

[0003] The most widely used type of buckling-restrained steel brace is the single-core, T-shaped single-mandrel brace. Because the yield section of the mandrel continuously compresses the inner wall of the external restraint at multiple contact points during buckling deformation, certain requirements are placed on the stiffness and strength of the restraint members to ensure the development of multi-wave buckling of the mandrel. However, the single-core, T-shaped single-mandrel buckling-restrained steel brace has the following drawbacks:

[0004] Single-core buckling-restrained braces, with their small slenderness ratio, are highly susceptible to overall or local instability if the stiffness and strength of the restraint members cannot effectively limit the deformation of the core rod. Simply increasing the size and material strength of the restraint members to meet the buckling-restraining requirements will not improve the brace's load-bearing capacity but will increase material costs.

[0005] The constraint plate of a single-character core support is close to the neutral axis of the support section, resulting in low out-of-plane stiffness. To enhance its stability, stiffening ribs are usually welded to the constraint plates on both sides, or channel steel is used as a constraint unit, which is a relatively cumbersome construction method.

[0006] When a single-shaped core support is connected to the beam-column node plate using bolts or pins, an additional connecting plate is often required, which increases the complexity of the connection. Utility Model Content

[0007] The purpose of this invention is to provide an assembled double-core bracing steel support for I-beams, which solves the problem that existing single-core bracing supports are prone to overall or local instability.

[0008] The technical solution adopted in this utility model is an assembled double-core anti-buckling steel support for a core I-beam, including a core I-beam. Core rods are symmetrically arranged on the upper and lower surfaces of the "I" shape of the core I-beam along the length of the core I-beam. An upper cover plate and a lower cover plate are also provided on the side of the upper and lower core rods facing away from the core I-beam. The core I-beam, the two core rods, and the upper and lower cover plates are fixedly connected by bolts. One end face of the core rod is flush with the corresponding end face of the core I-beam, and a pad is provided between the end face of the core rod and the upper or lower surface of the core I-beam. The other end of the core rod extends out of the core I-beam. The two ends of the core rods extending out of the core I-beam are also connected by a movable head through bolt a. A pad is also provided between the core rod and the movable head.

[0009] The present invention is further characterized in that,

[0010] The inner core I-beam has symmetrically arranged constraint side plates on both sides of the core rod on its upper and lower surfaces. An installation gap is formed between the two constraint side plates on the upper and lower surfaces of the inner core I-beam. The installation gap is adapted to the size of the corresponding position of the core rod. The core rod is placed in the installation gap and fixed by bolts passing through the upper cover plate, the constraint side plate on the upper side of the inner core I-beam, the upper flange plate of the inner core I-beam, the lower flange plate of the inner core I-beam, the constraint side plate on the lower side of the inner core I-beam, and the lower cover plate in sequence.

[0011] The core rod includes a core plate with a rectangular cross-section. The core plate has core heads integrally formed at both ends along its length. The end face of one core head is flush with the corresponding end face of the inner core I-beam. A pad is placed between the flush-faced core head and the corresponding upper or lower surface of the inner core I-beam. The other core head extends beyond the other end of the inner core I-beam. The two core heads extending beyond the inner core I-beam are connected to a movable head by bolt a. Constraint side plates are located on the upper and lower surfaces of the inner core I-beam on both sides of the core plate. The upper and lower core plates are fixed by bolts sequentially passing through the upper cover plate, the upper constraint side plate of the inner core I-beam, the upper flange of the inner core I-beam, the lower flange of the inner core I-beam, the lower constraint side plate of the inner core I-beam, and the lower cover plate.

[0012] The core head located on the upper or lower surface of the core I-beam is fixedly connected to the core I-beam by bolts.

[0013] The core head includes a transition plate connected to both ends of the core plate. The transition plate has an isosceles trapezoidal cross-section. The upper side of the isosceles trapezoid of the transition plate has the same width as the core plate, and one side of the upper part of the transition plate is integrated with both ends of the core plate. A reinforcing fixing plate with a rectangular cross-section is connected to one side of the lower side of the isosceles trapezoid of the transition plate. The width of the reinforcing fixing plate is the same as the width of the lower side of the isosceles trapezoid of the transition plate. The reinforcing fixing plate and the transition plate are integrated. The core plate, transition plate, and reinforcing fixing plate are all horizontally arranged. Vertical reinforcing ribs are also provided on the transition plate and the reinforcing fixing plate. The reinforcing ribs are integrated with the transition plate and the reinforcing fixing plate and are located on the center line of the core rod. The reinforcing fixing plates of the two core heads extending out of the core I-beam are connected to the movable head by bolts a. The core heads located on the upper or lower surface of the core I-beam are fixedly connected by bolts passing through their reinforcing fixing plates, pads, and the upper and lower flanges of the core I-beam.

[0014] The movable head is a double-web type I-beam. The inner I-beam has a fixing rib that is integrally formed with the inner I-beam on the side near the movable head. When the movable head is installed, the fixing rib extends between the two webs of the double-web type I-beam. When the movable head and the core head are fixed, the movable head and the core head are fixed by bolt a passing through the reinforcing fixing plate of the upper core head, the upper wing plate of the movable head, the lower wing plate of the movable head, and the reinforcing fixing plate of the lower core head in sequence.

[0015] A pad is provided between the reinforcing fixing plate of the upper core head and the upper wing plate of the movable head, and between the reinforcing fixing plate of the lower core head and the lower wing plate of the movable head. The pad is fixed by bolt a passing through the reinforcing fixing plate of the upper core head, the pad, the upper wing plate of the movable head, the lower wing plate of the movable head, the pad, and the reinforcing fixing plate of the lower core head in sequence.

[0016] The upper and lower cover plates are the same size. The sum of the width of the core plate and the width of the two constraint side plates is equal to the width of the upper or lower cover plate. The length of the upper cover plate, lower cover plate, and constraint side plates is the same as the length of the core plate. That is, the core ends of the core rod extend out of the upper cover plate, lower cover plate, and constraint side plates. The thickness of the constraint side plates is greater than the thickness of the core plate. By setting the thickness of the constraint side plates, core plate, and pad, gaps are created between the core plate of the core rod and the upper and lower surfaces of the core I-beam, as well as the lower surface of the upper cover plate and the upper surface of the lower cover plate.

[0017] The width of the movable head is the same as the width of the reinforcing plate, and the length of the movable head is the sum of the lengths of the reinforcing plate and the transition plate. The length and width of the pad are the same as the length and width of the reinforcing plate, respectively.

[0018] The beneficial effects of this utility model are:

[0019] (1) High load-bearing capacity

[0020] This invention employs a dual-core (core rod and core H-beam) support, which offers significant advantages in structural performance. Firstly, although the core rod has a large slenderness ratio, the core H-beam can continue to bear external loads after the dual core rods are stressed and undergo multiple yielding stages, ensuring structural stability and reliability. Secondly, the thickness of the core plate in each core rod of the dual-core structure is less than the thickness requirement of the core rod in existing single-core buckling braces. Therefore, during core rod processing, this invention's dual-core support can reduce the increase in initial defects such as non-metallic impurities, microcracks, and micropores during smelting, rolling, and processing caused by increased plate thickness, thereby improving the overall quality and durability of the support.

[0021] (2) It has good stability and simple cross-sectional structure.

[0022] The deformation of the core plate of this utility model depends on the size of the gap between the core plate and the upper and lower cover plates and the core I-beam. The size of the gap can be directly controlled by the thickness of the pad plate. There is no need to weld additional stiffening ribs on the outside of the constraint plate, thereby avoiding the adverse effects of welding stress and residual deformation on the support performance, making the support structure simpler and more efficient.

[0023] (3) The end connection is simple and the construction and installation are convenient.

[0024] The novel core rod of this application has upper and lower cover plates extending from both ends, that is, the core unit extends the constraint unit at the end, which can be directly connected to the beam-column node plate by bolts. This not only shortens the connection length between the support and the frame and improves the stability of the connection section, but also greatly simplifies the construction process and improves work efficiency. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of the assembled double-core anti-buckling steel support for the core I-beam of this utility model;

[0026] Figure 2 yes Figure 1 Exploded view;

[0027] Figure 3 This is a schematic diagram of the core rod of the assembled double-core anti-buckling steel support for the core I-beam of this utility model;

[0028] Figure 4 This is a schematic diagram of the movable head in the assembled double-core anti-buckling steel support for the core I-beam of this utility model;

[0029] Figure 5 This is a structural schematic diagram of the core I-beam in the assembled double-core anti-buckling steel support of the core I-beam of this utility model.

[0030] In the diagram: 1. Core rod, 1-1. Core plate, 1-2. Core head, 1-3. Transition plate, 1-4. Reinforcing fixing plate, 1-5. Reinforcing rib plate, 2. Pad plate, 3. Upper cover plate, 3-1. Lower cover plate, 4. Constraint side plate, 5. Movable head, 6. Core I-beam, 7. Bolt, 7-1. Bolt a, 8. Fixing rib. Detailed Implementation

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

[0032] Example 1

[0033] This utility model relates to an assembled double-core bracing steel support for I-beams, such as... Figure 1-2 As shown, the assembled double-core bracing steel support for the core I-beam includes a core I-beam 6. Core rods 1 are symmetrically arranged on the upper and lower surfaces of the "I" shape along the length of the core I-beam 6. The upper and lower core rods 1 are also provided with an upper cover plate 3 and a lower cover plate 3-1 on the side away from the core I-beam 6. The core I-beam 6, the two core rods 1, and the upper cover plate 3 and the lower cover plate 3-1 are fixedly connected by bolts 7. One end face of the core rod 1 is flush with the corresponding end face of the core I-beam 6, and a pad 2 is provided between the end face of the core rod 1 and the upper or lower surface of the core I-beam 6. The other end of the core rod 1 extends out of the core I-beam 6. The two ends of the core rod 1 extending out of the core I-beam 6 are also connected by a movable head 5 by bolts a7-1. A pad 2 is also provided between the core rod 1 and the movable head 5.

[0034] The inner core I-beam 6 has symmetrically arranged constraint side plates 4 on both sides of the core rod 1 on its upper and lower surfaces. An installation gap is formed between the two constraint side plates 4 on the upper and lower surfaces of the inner core I-beam 6. The size of the installation gap is adapted to the corresponding position of the core rod 1. The core rod 1 is placed in the installation gap and fixed by bolts 7 passing through the upper cover plate 3, the constraint side plate 4 on the upper side of the inner core I-beam 6, the upper flange of the inner core I-beam 6, the lower flange of the inner core I-beam 6, the constraint side plate 4 on the lower side of the inner core I-beam 6, and the lower cover plate 3-1 in sequence.

[0035] like Figure 3As shown, the core rod 1 includes a core plate 1-1 with a rectangular cross-section. Both ends of the core plate 1-1 along its length are provided with core heads 1-2 integrally formed with the core plate 1-1. The end face of one end of the core head 1-2 is flush with the end face of the corresponding end of the core I-beam 6. A pad 2 is provided between the end of the core head with the flush end face and the corresponding upper or lower surface of the core I-beam 6. The other end of the core rod 1 has its core head 1-2 extending beyond the other end of the core I-beam 6. The two core heads 1-2 extending beyond the core I-beam 6 are connected to the movable head 5 by bolts a7-1. The constraint side plates 4 are located on both sides of the core plate 1-1 on the upper and lower surfaces of the core I-beam 6. The upper and lower core plates 1-1 are fixed by bolts 7 sequentially passing through the upper cover plate 3, the constraint side plate 4 on the upper side of the core I-beam 6, the upper wing plate of the core I-beam 6, the lower wing plate of the core I-beam 6, the constraint side plate 4 on the lower side of the core I-beam 6, and the lower cover plate 3-1.

[0036] The core head 1-2 located on the upper or lower surface of the core I-beam 6 is fixedly connected to the core I-beam 6 by bolts 7.

[0037] The core head 1-2 includes a transition plate 1-3 connected to both ends of the core plate 1-1. The transition plate 1-3 has an isosceles trapezoidal cross-section. The upper side of the isosceles trapezoid of the transition plate 1-3 has the same width as the core plate 1-1, and one side of the upper side of the transition plate 1-3 is integrated with both ends of the core plate 1-1. A reinforcing fixing plate 1-4 with a rectangular cross-section is connected to one side of the lower side of the isosceles trapezoid of the transition plate 1-3. The width of the reinforcing fixing plate 1-4 is the same as the width of the lower side of the isosceles trapezoid of the transition plate 1-3. The reinforcing fixing plate 1-4 and the transition plate 1-3 are integrated. The core plate 1-1, the transition plate 1-3, and the reinforcing fixing plate 1-2 are integrated. The reinforcing plates 1-4 are all horizontally set. The transition plate 1-3 and the reinforcing plates 1-4 are also jointly provided with vertical reinforcing ribs 1-5. The reinforcing ribs 1-5 are integrated with the transition plate 1-3 and the reinforcing plates 1-4 and are located on the center line of the core rod 1. The reinforcing plates 1-4 of the two core heads 1-2 extending out of the core I-beam 6 are connected to the movable head 5 by bolts a7-1. The core heads 1-2 located on the upper or lower surface of the core I-beam 6 are fixedly connected by bolts 7 through their reinforcing plates 1-4, pads 2, and the upper and lower flanges of the core I-beam 6.

[0038] The reinforcing ribs 1-5 can enhance the structural stability.

[0039] The core rods 1 on the upper and lower sides of the core I-beam 6 are completely identical in size and structure, and are all made of Q235B steel with a low yield point. The total length of the core rod is greater than the length of the upper cover plate, the lower cover plate and the constraint side plate. The part of the core rod that extends beyond the constraint cover plate (upper cover plate and lower cover plate) and the constraint side plate at both ends is a transition section, which is used to ensure a smooth transition during the stress process and reduce stress concentration.

[0040] like Figure 4 As shown, the movable head 5 is a double-web type I-beam, such as... Figure 5 As shown, a fixing rib 8 is integrally formed with the core I-beam 6 on the side near the movable head 5. When the movable head 5 is installed, the fixing rib 8 extends between the two webs of the double-web type I-beam. When the movable head 5 and the core head 1-2 are fixed, the movable head 5 and the core head 1-2 are fixed by bolts a7-1 passing through the reinforcing fixing plate 1-4 of the upper core head 1-2, the upper wing plate of the movable head 5, the lower wing plate of the movable head 5, and the reinforcing fixing plate 1-4 of the lower core head 1-2 in sequence.

[0041] A pad 2 is provided between the reinforcing fixing plate 1-4 of the upper core head 1-2 and the upper wing plate of the movable head 5, and between the reinforcing fixing plate 1-4 of the lower core head 1-2 and the lower wing plate of the movable head 5. The pads are fixed by bolts a7-1 passing through the reinforcing fixing plate 1-4 of the upper core head 1-2, the pad 2, the upper wing plate of the movable head 5, the lower wing plate of the movable head 5, the pad 2, and the reinforcing fixing plate 1-4 of the lower core head 1-2 in sequence.

[0042] The upper cover plate 3 and the lower cover plate 3-1 have the same dimensions. The sum of the width of the core plate 1-1 and the width of the two constraint side plates 4 is equal to the width of the upper cover plate 3 or the lower cover plate 3-1. The length of the upper cover plate 3, the lower cover plate 3-1, and the constraint side plates 4 is the same as the length of the core plate 1-1. That is, the core head 1-2 at both ends of the core rod 1 extends out of the upper cover plate 3, the lower cover plate 3-1, and the constraint side plates 4. The thickness of the constraint side plates 4 is greater than the thickness of the core plate 1-1. By setting the thickness of the constraint side plates 4, the core plate 1-1, and the pad 2, gaps are created between the core plate 1-1 of the core rod 1 and the upper and lower surfaces of the core I-beam 6, as well as the lower surface of the upper cover plate 3 and the upper surface of the lower cover plate 3-1.

[0043] The width of the movable head 5 is the same as the width of the reinforcing fixing plate 1-4, and the length of the movable head 5 is the sum of the lengths of the reinforcing fixing plate 1-4 and the transition plate 1-3. The length and width of the pad 2 are the same as the length and width of the reinforcing fixing plate 1-4, respectively.

[0044] In this embodiment, the prefabricated double-core buckling-resistance steel support for the core I-beam is manufactured by prefabricating all parts in the factory. Bolt holes are pre-drilled at corresponding positions in the core rod 1, pad 2, cover plate 3, restraint side plate 4, movable head 5, and core I-beam 6. At the construction site, bolts 7 are first inserted into the upper cover plate 3, and then the two restraint side plates 4 are respectively inserted into both sides of the upper cover plate 3 by bolts 7. The core rod 1 is then installed in the gap between the two restraint side plates 4. Finally, the core I-beam 6 is connected to the upper cover plate 3 by bolts 7. The lower side of the constraint side plate 4; similarly, insert bolts 7 into both sides of the lower cover plate 3-1, and connect the second set of constraint side plates 4 to the lower cover plate 3-1. Then, install the lower core rod 1 in the middle gap of the constraint side plate 4, and connect this part to the lower side of the core I-beam 6 with bolts 7. Then, install the movable head 5 between the core rods, and insert the protruding fixing rib 8 of the core I-beam 6 into the gap of the double web inside the movable head 5. Finally, place the pad 2 between the core rod 1 and the movable head 5, and use bolts a7-1 to fix it.

[0045] The working principle of the prefabricated double-core buckling-restrained steel brace of the core I-beam in this embodiment is as follows: When a small axial force is applied, due to the setting of the pad and the difference in thickness between the core plate and the restraint side plate, an initial gap exists, causing the core rod to undergo a semi-wavy deformation. As the axial force increases, the deformation of the core rod gradually increases until it contacts the external restraint cover plates (upper cover plate 3 and lower cover plate 3-1). Due to the constraint of the restraint cover plates (upper cover plate 3 and lower cover plate 3-1), the first-order buckling deformation of the core rod reaches its maximum value. As the axial force continues to increase, due to the length of the core rod, the transition section shrinks inward, causing the yielding section of the core rod to gradually develop from single-point buckling to multi-point buckling. Under the constraint of the external restraint, each contact point gradually develops into a contact surface, and the contact surface also continuously expands. Throughout the entire stress process of the buckling-restrained brace, due to the restraining effect of the external restraint members on the deformation of the core rod, the core rod gradually develops from the first-order buckling mode to a higher-order buckling mode, and the bearing capacity of the core rod continuously increases. After the core rod yields at the contact point with the external restraint, it enters the plastic stage and can still continue to bear loads.

[0046] This utility model adopts a structure with two core rods and three constraints (i.e., the combined constraint of the cover plate and the left and right constraint side plates). In the support structure, the core I-beam 6 is used as the main support component. Due to the regular cross-section of the I-beam, it is convenient to weld and drill holes on its surface, which greatly enhances the expandability of the support component. It also allows the support structure to obtain a larger cross-section with a small increase in material consumption, reducing the strength difference between the strong axis and the weak axis of the support. At the same time, the increase in slenderness ratio is also conducive to preventing out-of-plane instability of the support. This utility model is provided with a movable head at one end. This allows the support to continue to bear the compressive load by relying on the core I-beam after both core rods have broken and failed, because the movable head is still restricted to the fixed rib 8, thus improving the safety of the structure.

[0047] Example 2

[0048] Based on Example 1, when the upper cover plate 3, lower cover plate 3-1, constraint side plate 4 and core I-beam 6 are fixed by bolts 7, at least 6 bolts 7 are evenly arranged on both sides of the upper cover plate 3.

[0049] Example 3

[0050] Based on Example 2, when fixing the two core heads 1-2 of the core rod 1, two bolts are evenly arranged on both sides of the reinforcing rib plate 1-5.

Claims

1. A prefabricated double-core anti-buckling steel support for a core I-beam, characterized in that, The structure includes a core I-beam (6), on which core rods (1) are symmetrically arranged on the upper and lower surfaces of the "I" shape along the length of the core I-beam (6). The upper and lower core rods (1) are also provided with an upper cover plate (3) and a lower cover plate (3-1) on the side facing away from the core I-beam (6). The core I-beam (6), the two core rods (1), and the upper cover plate (3) and lower cover plate (3-1) are fixedly connected by bolts (7). One end of the core rod (1) The end face of the core rod (1) is flush with the end face of the core I-beam (6), and a pad (2) is provided between the end face of the core rod (1) and the upper or lower surface of the core I-beam (6). The other end of the core rod (1) extends out of the core I-beam (6). The two core rods (1) extending out of the core I-beam (6) are connected by a bolt a (7-1) to a movable head (5). A pad (2) is also provided between the core rod (1) and the movable head (5).

2. The assembled double-core buckling-resistant steel support for core I-beams according to claim 1, characterized in that, The inner core I-beam (6) has symmetrically arranged constraint side plates (4) on the upper and lower surfaces on both sides of the core rod (1). An installation gap is formed between the two constraint side plates (4) on the upper and lower surfaces of the inner core I-beam (6). The installation gap is adapted to the size of the corresponding position of the core rod (1). The core rod (1) is placed in the installation gap and is fixed by bolts (7) passing through the upper cover plate (3), the constraint side plate (4) on the upper side of the inner core I-beam (6), the upper wing plate of the inner core I-beam (6), the lower wing plate of the inner core I-beam (6), the constraint side plate (4) on the lower side of the inner core I-beam (6), and the lower cover plate (3-1).

3. The assembled double-core buckling-resistant steel support for core I-beams according to claim 2, characterized in that, The core rod (1) includes a core plate (1-1) with a rectangular cross-section. Both ends of the core plate (1-1) along its length are provided with core heads (1-2) integrally formed with the core plate (1-1). The end face of one end of the core head (1-2) of the core rod (1) is flush with the end face of the corresponding end of the inner core I-beam (6). A pad (2) is provided between the end of the core head with the flush end face and the upper or lower surface of the corresponding inner core I-beam (6). The other end of the core rod (1) has its core head (1-2) extending beyond the other end of the inner core I-beam (6), extending beyond the inner core. The two core heads (1-2) of the nuclear I-beam (6) are connected together by bolt a (7-1) to the movable head (5). The constraint side plate (4) is located on both sides of the core plate (1-1) on the upper and lower surfaces of the nuclear I-beam (6). The upper and lower core plates (1-1) are fixed by bolts (7) passing through the upper cover plate (3), the constraint side plate (4) on the upper side of the nuclear I-beam (6), the upper wing plate of the nuclear I-beam (6), the lower wing plate of the nuclear I-beam (6), the constraint side plate (4) on the lower side of the nuclear I-beam (6), and the lower cover plate (3-1).

4. The assembled double-core buckling-resistant steel support for core I-beams according to claim 3, characterized in that, The core head (1-2) located on the upper or lower surface of the core I-beam (6) is fixedly connected to the core I-beam (6) by bolts (7).

5. The assembled double-core buckling-resistant steel support for core I-beams according to claim 4, characterized in that, The core head (1-2) includes a transition plate (1-3) connected to both ends of the core plate (1-1). The transition plate (1-3) has an isosceles trapezoidal cross-section. The upper side of the isosceles trapezoid of the transition plate (1-3) has the same width as the core plate (1-1), and one side of the upper side of the transition plate (1-3) is integrated with both ends of the core plate (1-1). A reinforcing fixing plate (1-4) with a rectangular cross-section is connected to one side of the lower side of the isosceles trapezoid of the transition plate (1-3). The width of the reinforcing fixing plate (1-4) is the same as the width of the lower side of the isosceles trapezoid of the transition plate (1-3). The reinforcing fixing plate (1-4) and the transition plate (1-3) are integrated. The core plate (1-1) and the transition plate (1-3) are... The reinforcing fixing plates (1-4) are all horizontally arranged. The transition plate (1-3) and the reinforcing fixing plate (1-4) are also provided with vertical reinforcing ribs (1-5). The reinforcing ribs (1-5) are integrated with the transition plate (1-3) and the reinforcing fixing plate (1-4) and are located on the center line of the core rod (1). The reinforcing fixing plates (1-4) of the two core heads (1-2) extending out of the core I-beam (6) are connected to the movable head (5) by bolts a (7-1). The core head (1-2) located on the upper or lower surface of the core I-beam (6) is fixedly connected by bolts (7) through its reinforcing fixing plate (1-4), pad (2), upper wing plate and lower wing plate of the core I-beam (6).

6. The assembled double-core bracing for buckling-resistance I-beams according to claim 5, characterized in that, The movable head (5) is a double-web type I-beam. The inner core I-beam (6) is provided with a fixing rib (8) that is integrally formed with the inner core I-beam (6) on one side near the movable head (5). When the movable head (5) is installed, the fixing rib (8) extends between the two webs of the double-web type I-beam. When the movable head (5) and the core head (1-2) are fixed, the movable head (5) and the core head (1-2) are fixed by bolt a (7-1) passing through the reinforcing fixing plate (1-4) of the upper core head (1-2), the upper wing plate of the movable head (5), the lower wing plate of the movable head (5), and the reinforcing fixing plate (1-4) of the lower core head (1-2) in sequence.

7. The assembled double-core buckling-resistant steel support for core I-beams according to claim 6, characterized in that, The pads (2) are provided between the reinforcing fixing plate (1-4) of the upper core head (1-2) and the upper wing plate of the movable head (5), and between the reinforcing fixing plate (1-4) of the lower core head (1-2) and the lower wing plate of the movable head (5). The pads (2) are fixed by bolts a (7-1) passing through the reinforcing fixing plate (1-4) of the upper core head (1-2), the pads (2), the upper wing plate of the movable head (5), the lower wing plate of the movable head (5), the pads (2), and the reinforcing fixing plate (1-4) of the lower core head (1-2) in sequence.

8. The assembled double-core buckling-resistant steel support for core I-beams according to claim 7, characterized in that, The upper cover plate (3) and the lower cover plate (3-1) have the same dimensions. The width of the core plate (1-1) and the sum of the widths of the two constraint side plates (4) are equal to the width of the upper cover plate (3) or the lower cover plate (3-1). The lengths of the upper cover plate (3), the lower cover plate (3-1), and the constraint side plates (4) are the same as the length of the core plate (1-1). That is, the core heads (1-2) at both ends of the core rod (1) extend out of the upper cover plate (3), the lower cover plate (3-1), and the constraint side plates (4). The thickness of the constraint side plates (4) is greater than the thickness of the core plate (1-1). By setting the thickness of the constraint side plates (4), the core plate (1-1), and the pad (2), there are gaps between the core plate (1-1) of the core rod (1) and the upper and lower surfaces of the core I-beam (6), as well as the lower surface of the upper cover plate (3) and the upper surface of the lower cover plate (3-1).

9. The assembled double-core buckling-resistant steel support for core I-beams according to claim 8, characterized in that, The width of the movable head (5) is the same as the width of the reinforcing fixing plate (1-4), the length of the movable head (5) is the sum of the lengths of the reinforcing fixing plate (1-4) and the transition plate (1-3), and the length and width of the pad (2) are the same as the length and width of the reinforcing fixing plate (1-4).

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