Detachable reinforced compression rod piece at support end of grid structure

Abstract

The utility model discloses a detachable reinforced compression rod piece at a support end of a grid structure, which comprises a first section of pipe, a second section of pipe, at least one pair of first hoops, at least one pair of second hoops, at least one pair of third hoops and at least one pair of fourth hoops, at least one pair of second hoops is arranged at the end part of the second pipe section; at least one first convex ring and at least one second convex ring are formed on the sleeve; the sleeve sleeves the end part of the first section pipe and the end part of the second section pipe; the first convex rings are positioned between two adjacent first hoops; and the second convex rings are positioned between the two adjacent second hoops. The total length of the first section pipe and the second section pipe is close to that of an existing slender rod piece, the buckling bearing capacity of the first section pipe is superior to that of the existing slender rod piece, and the buckling bearing capacity of the second section pipe is superior to that of the existing slender rod piece. And the thickened sleeve provides additional rigidity for the detachable reinforced compression rod piece, so that the buckling resistance of the detachable reinforced compression rod piece is further effectively enhanced.

Description

Technical Field

[0001] This utility model relates to the field of space frame structure technology, and in particular to a detachable reinforced compression member at the support end of a space frame structure. Background Technology

[0002] Space frame structures, as typical large-span spatial structures, are widely used in large-span, large-column-grid public infrastructure projects due to their excellent load-bearing performance, strong spatial flexibility, and good economic benefits. Given the high redundancy of large-span spatial structures, it was previously believed that the failure of individual members would have little impact on the structure's load-bearing capacity, let alone trigger progressive collapse. However, numerous actual engineering accidents have shown that despite their high static indeterminate degrees, progressive collapse remains a significant hidden danger in large-span spatial structures, especially for space frame structures commonly used in large urban public buildings. A collapse of such a structure inevitably comes with greater economic and public safety costs.

[0003] The diagonal web members at the support ends play a crucial role in the load-bearing and collapse resistance of such space frame structures. Numerous studies have shown that their compressive buckling often marks the beginning of progressive collapse in the space frame. Therefore, improving their compressive buckling capacity is an important research topic for ensuring the safety of space frame structures. Existing methods mostly involve increasing the cross-section of the members or improving the material strength, but the compressive buckling capacity of the members in space frame structures still needs further improvement.

[0004] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a detachable reinforced compression member at the support end of a space frame structure, in order to address the above-mentioned deficiencies of the prior art and to solve the problem that the compressive buckling bearing capacity of the members in the space frame structure still needs to be further improved.

[0006] The technical solution adopted by this utility model to solve the technical problem is as follows:

[0007] A detachable reinforced compression member at the support end of a space frame structure, comprising:

[0008] The first section of pipe has at least one pair of first sleeves at its end;

[0009] The second section of pipe has at least one pair of second sleeves at its end;

[0010] The sleeve has at least one first convex ring and at least one second convex ring;

[0011] The sleeve is fitted onto the end of the first section of pipe and the end of the second section of pipe;

[0012] The first convex ring is located between two adjacent first sleeves;

[0013] The second convex ring is located between two adjacent second sleeves.

[0014] The detachable reinforced compression member at the support end of the aforementioned space frame structure has a gap between the end of the first section of the tube and the end of the second section of the tube.

[0015] The detachable reinforced compression member at the support end of the space frame structure, wherein the sleeve comprises: two halves, the two halves being connected by a connector.

[0016] The detachable reinforced compression member at the support end of the aforementioned space frame structure, wherein the half-piece comprises:

[0017] An arc-shaped portion, wherein at least one first semi-ring and at least one second semi-ring are formed on the inner side of the arc-shaped portion;

[0018] Two extensions are formed at both ends of the arc-shaped portion;

[0019] The extended portion has a through hole for the connector to pass through and connect.

[0020] The two halves of the first ring are joined together to form the first convex ring;

[0021] The two halves of the second ring are joined together to form the second convex ring.

[0022] The detachable reinforced pressure-bearing member at the support end of the space frame structure, wherein the connecting member is a bolt; the thickness of the arc-shaped part and the thickness of the extended part are the same as the thickness of the first section of the tube; the sum of the length of the first section of the tube and the length of the second section of the tube is the tube length, and the ratio of the length of the half piece to the tube length is 1 to 2:10.

[0023] The detachable reinforced compression member at the support end of the space frame structure, wherein the first section of pipe and the second section of pipe are both made of steel pipe; the sleeve is made of steel cylinder; and the first sleeve hoop and the second sleeve hoop are both made of steel hoop.

[0024] The detachable reinforced compression member at the support end of the space frame structure, wherein the first sleeve is welded to the first section of pipe on the side away from the first convex ring, the side of the first sleeve facing the first convex ring forms a first guide surface, and the side of the first convex ring facing the first sleeve forms a first chamfer.

[0025] The detachable reinforced compression member at the support end of the space frame structure, wherein the side of the second sleeve opposite to the second convex ring is welded to the second section pipe, the side of the second sleeve facing the second convex ring forms a second guide surface, and the side of the second convex ring facing the second sleeve forms a second chamfer.

[0026] The detachable reinforced compression member at the support end of the space frame structure, wherein the outer diameter of the first section of the tube and the outer diameter of the second section of the tube are both 100mm to 130mm;

[0027] The lengths of both the first and second sleeves are 40mm to 100mm.

[0028] The lengths of the first convex ring and the second convex ring are both 80mm to 120mm.

[0029] The detachable reinforced compression member at the support end of the space frame structure, wherein the thickness of the first sleeve, the thickness of the second sleeve, the thickness of the first convex ring, and the thickness of the second convex ring are all 6mm to 10mm.

[0030] Beneficial effects: The total length of the first and second tube sections is close to that of existing slender members. The buckling capacity of the first tube section is superior to that of existing slender members, and the buckling capacity of the second tube section is also superior to that of existing slender members. The thickened sleeve provides additional stiffness to the detachable reinforced compression member, thereby further enhancing its buckling resistance. Attached Figure Description

[0031] Figure 1 This is a first exploded view of the detachable reinforced compression member in an embodiment of this utility model.

[0032] Figure 2 yes Figure 1 Enlarged view of the middle sleeve.

[0033] Figure 3 This is a schematic diagram of the first structure of the sleeve in an embodiment of this utility model.

[0034] Figure 4 This is a second exploded view of the detachable reinforced compression member in an embodiment of this utility model.

[0035] Figure 5 This is a schematic diagram of the structure of the half piece in an embodiment of this utility model.

[0036] Figure 6 This is a structural schematic diagram of the end of the first tube and the end of the second tube in an embodiment of this utility model.

[0037] Figure 7This is a comparison diagram of the nonlinear buckling load-displacement curves of the unstrengthened and strengthened members in the embodiments of this utility model.

[0038] Explanation of reference numerals in the attached figures:

[0039] 10. First section of pipe; 20. Second section of pipe; 31. First sleeve; 311. First guide surface; 32. Second sleeve; 321. Second guide surface; 40. Sleeve; 41. First convex ring; 411. First half ring; 412. First chamfer; 42. Second convex ring; 421. Second half ring; 422. Second chamfer; 4a. Half piece; 4a1. Arc-shaped part; 4a2. Outer part; 4a21. Through hole; 4b. Connector. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0041] Please also refer to Figures 1-7 This utility model provides some embodiments of a detachable reinforced compression member at the support end of a space frame structure.

[0042] like Figures 1-2 As shown, the detachable reinforced compression member at the support end of the space frame structure of this utility model includes:

[0043] The first section of pipe 10 has at least one pair of first sleeves 31 at its end;

[0044] The second section of pipe 20 has at least one pair of second sleeves 32 at its end;

[0045] Sleeve 40 is formed with at least one first protruding ring 41 and at least one second protruding ring 42;

[0046] The sleeve 40 is fitted onto the end of the first section pipe 10 and the end of the second section pipe 20; the first convex ring 41 is located between two adjacent first sleeves 31; and the second convex ring 42 is located between two adjacent second sleeves 32.

[0047] Specifically, detachable reinforced compression members are applied to space frame structures. For example, detachable reinforced compression members are connected to the support ends of the space frame structure, especially the diagonal web members at the support ends. Compared with slender members (especially diagonal web members) in the prior art, the length of the first section 10 and the second section 20 in this application are shorter than the length of existing slender members. The total length of the first section 10 and the second section 20 is close to that of existing slender members. The buckling bearing capacity of the first section 10 is superior to that of existing slender members, and the buckling bearing capacity of the second section 20 is superior to that of existing slender members. The sleeve 40 is fitted onto the ends of the first section 10 and the second section 20, which not only realizes the detachable connection of the first section 10 and the second section 20, facilitating dismantling and recycling, but also further improves the overall buckling bearing capacity of the detachable reinforced compression member.

[0048] Furthermore, the detachable reinforced compression member of this application can be directly manufactured or modified from an existing slender member. For example, using an existing slender member as the member to be reinforced, a small section is cut off to form a first tube 10 and a second tube 20. Then, a sleeve 40 is installed on the first tube 10 and the second tube 20 to connect them. Figure 3 The existing slender rods are transformed into detachable reinforced compression members. The length of the first tube 10 or the second tube 20 refers to the axial length along the tube (i.e., the first tube 10 or the second tube 20). The lengths of the first tube 10 and the second tube 20 are close, for example, the ratio of the length of the first tube 10 to the length of the second tube 20 is 0.9 to 1.1:1. The thickened sleeve 40 is located approximately in the middle region of the detachable reinforced compression member (i.e., the region where the slender rod experiences axial compression buckling failure). The thickened sleeve 40 provides additional stiffness to the middle region of the detachable reinforced compression member, thereby further and effectively enhancing the buckling resistance of the detachable reinforced compression member. In existing slender rods, buckling occurs in the middle region. In this application, the detachable reinforced compression member no longer exhibits mid-span buckling, but instead forms two end-bending tubes, thereby changing the axial compression failure mode of the slender rod and improving the ultimate axial compression bearing capacity.

[0049] There can be two or more first clamps 31. For example, an even number of first clamps 31 can be used. Two first clamps 31 form a pair and a clamp group. Each clamp group corresponds to a first convex ring 41. The two first clamps 31 in the clamp group form a groove and restrict the axial movement of the first convex ring 41. There can also be two or more second clamps 32. For example, an even number of second clamps 32 can be used. Two second clamps 32 form a pair and a clamp group. Each clamp group corresponds to a second convex ring 42. The two second clamps 32 in the clamp group form a groove and restrict the axial movement of the second convex ring 42. The cooperation between the clamps and the convex rings ensures the stability and strength of the sleeve 40 when connecting the first section of pipe 10 and the second section of pipe 20. The connection between the clamps and the convex rings needs to have sufficient precision to avoid stress concentration or structural instability caused by installation errors.

[0050] In a preferred embodiment of this utility model, such as Figure 2 , Figure 4 as well as Figure 6 As shown, there is a gap between the end of the first section of pipe 10 and the end of the second section of pipe 20.

[0051] Specifically, the ends of the first pipe segment 10 and the second pipe segment 20 are not in direct contact, but are spaced apart. When the first pipe segment 10 or the second pipe segment 20 is subjected to force, the ends of the first pipe segment 10 and the second pipe segment 20 will not directly contact each other, forming two relatively independent pipes. Because the sleeve 40 is shorter (much shorter than the length of the first pipe segment 10 and also much shorter than the length of the second pipe segment 20), the sleeve 40 is less prone to buckling and has higher compressive strength.

[0052] In a preferred embodiment of this utility model, such as Figures 2-5 As shown, the sleeve 40 includes two halves 4a, which are connected by a connector 4b.

[0053] Specifically, the two halves 4a are joined together and connected by connector 4b. A first protruding ring 41 is located between two first sleeves 31, and a second protruding ring 42 is located between two second sleeves 32, thus connecting the first section of pipe 10 and the second section of pipe 20. By disassembling connector 4b, the two halves 4a can be removed, thereby enabling the disassembly of the entire detachable reinforced compression member. The two halves 4a can have the same structure.

[0054] In a preferred embodiment of this utility model, such as Figure 2 and Figure 5 As shown, the half-piece 4a includes:

[0055] The arc-shaped portion 4a1 has at least one first semi-ring 411 and at least one second semi-ring 421 formed on its inner side;

[0056] Two protrusions 4a2 are respectively formed at both ends of the arc-shaped portion 4a1;

[0057] The extended portion 4a2 has a through hole 4a21 for the connector 4b to pass through and connect; the first half ring 411 of the two halves 4a are joined together to form the first convex ring 41; the second half ring 421 of the two halves 4a are joined together to form the second convex ring 42.

[0058] Specifically, the arc-shaped portion 4a1 is adapted to the end of the first section of pipe 10 and the end of the second section of pipe 20, respectively. The extension portion 4a2 extends outward from the arc-shaped portion 4a1, and each arc-shaped portion 4a1 has two extension portions 4a2, which are located at both ends of the arc-shaped portion 4a1. The extension portions 4a2 of the two halves 4a approach each other and are connected by the connector 4b.

[0059] In a preferred embodiment of this utility model, such as Figure 2 and Figure 4 As shown, the connector 4b is a bolt.

[0060] Specifically, the connector 4b can be a bolt, which passes through the through hole 4a21 to connect the extended portions 4a2 of the two halves 4a. The bolt is a high-strength bolt, capable of withstanding large axial forces and shear forces, thereby enhancing the load-bearing capacity of the half 4a.

[0061] In a preferred embodiment of this utility model, such as Figure 1 and Figure 4 As shown, the thickness of the arc-shaped portion 4a1 and the thickness of the extended portion 4a2 are the same as the thickness of the first section of tube 10; the sum of the length of the first section of tube 10 and the length of the second section of tube 20 is the tube length, and the ratio of the length of the half piece 4a to the tube length is 1 to 2:10.

[0062] Specifically, the thickness of the arc-shaped portion 4a1 refers to the radial thickness along the pipe (i.e., the first section of pipe 10 or the second section of pipe 20), which is also the difference between the outer diameter and the inner diameter. The thickness of the arc-shaped portion 4a1 and the thickness of the extended portion 4a2 are generally greater than or equal to the thickness of the first section of pipe 10, and the thickness of the arc-shaped portion 4a1 and the extended portion 4a2 are generally greater than or equal to the thickness of the second section of pipe 20. For example, the thickness of both the arc-shaped portion 4a1 and the extended portion 4a2 is greater than 3 mm, specifically selected based on the thickness of the first section of pipe 10 or the second section of pipe 20. The length of the half-piece 4a refers to the axial length along the pipe (i.e., the first section of pipe 10 or the second section of pipe 20), and the length of the half-piece 4a is the length of the sleeve 40, which accounts for 10% to 20% of the pipe length.

[0063] In a preferred embodiment of this utility model, the first pipe section 10 and the second pipe section 20 are both made of steel pipe; the sleeve 40 is made of steel cylinder; and the first clamp 31 and the second clamp 32 are both made of steel clamp.

[0064] Specifically, the first pipe section 10, the second pipe section 20, the sleeve 40, the first clamp 31, and the second clamp 32 can be made of steel. The first pipe section 10 and the second pipe section 20 are made of steel pipe, the sleeve 40 is made of steel cylinder, and the first clamp 31 and the second clamp 32 are made of steel clamp.

[0065] In a preferred embodiment of this utility model, such as Figure 6 As shown, the first sleeve 31 is welded to the first section pipe 10 on the side opposite to the first convex ring 41, the first sleeve 31 forms a first guide surface 311 on the side facing the first convex ring 41, and the first convex ring 41 forms a first chamfer 412 on the side facing the first sleeve 31.

[0066] Specifically, when both the first sleeve 31 and the first pipe section 10 are made of steel, they can be connected by welding. A first guide surface 311 is formed on the first sleeve 31, and a first chamfer 412 is formed on the first convex ring 41. The first chamfer 412 and the first guide surface 311 can contact each other. The first guide surface 311 faces outward, and the first chamfer 412 faces inward. When the sleeve 40 and the first pipe section 10 move axially relative to each other, the first guide surface 311 guides the first chamfer 412, converting the axial pressure of the first pipe section 10 into the radial pressure of the sleeve 40. Under the locking action of the connector 4b, the two halves 4a of the sleeve 40 are not easily spread apart, and the sleeve 40 is not easily buckled.

[0067] In a preferred embodiment of this utility model, such as Figure 6As shown, the second sleeve 32 is welded to the second section pipe 20 on the side opposite to the second convex ring 42, the second sleeve 32 forms a second guide surface 321 on the side facing the second convex ring 42, and the second convex ring 42 forms a second chamfer 422 on the side facing the second sleeve 32.

[0068] Specifically, when both the second sleeve 32 and the second section pipe 20 are made of steel, they can be connected by welding. A second guide surface 321 is formed on the second sleeve 32, and a second chamfer 422 is formed on the second convex ring 42. The second chamfer 422 and the second guide surface 321 can contact each other. The second guide surface 321 faces outward, and the second chamfer 422 faces inward. When the sleeve 40 and the second section pipe 20 move axially relative to each other, the second guide surface 321 guides the second chamfer 422, converting the axial pressure of the second section pipe 20 into the radial pressure of the sleeve 40. Under the locking action of the connector 4b, the two halves 4a of the sleeve 40 are not easily spread apart, and the sleeve 40 is not easily buckled. The angle between the first guide surface 311 and the first section pipe 10 is an obtuse angle, for example, 110° to 130°, or 120°. The angle between the second guide surface 321 and the second pipe section 20 is an obtuse angle, for example, 110° to 130°, or 120°. The welding of the first sleeve 31 to the first pipe section 10 and the welding of the second sleeve 32 to the second pipe section 20 can ensure a tight connection and consistent strength between the sleeve and the pipe.

[0069] In a preferred embodiment of this utility model, the outer diameter of the first pipe segment 10 and the outer diameter of the second pipe segment 20 are both 100mm to 130mm; the length of the first sleeve 31 and the length of the second sleeve 32 are both 40mm to 100mm; and the length of the first convex ring 41 and the length of the second convex ring 42 are both 80mm to 120mm.

[0070] Specifically, the length of the first clamp 31 or the length of the second clamp 32 refers to the axial length along the pipe (i.e., the first pipe segment 10 or the second pipe segment 20), and the length of the first convex ring 41 or the length of the second convex ring 42 refers to the axial length along the pipe (i.e., the first pipe segment 10 or the second pipe segment 20). The dimensions of each component in the rod are usually adjusted according to the requirements of the specific application scenario. In some application scenarios, the outer diameter of the first pipe segment 10 and the outer diameter of the second pipe segment 20 are both 100mm to 130mm, and the outer diameters of the first pipe segment 10 and the second pipe segment 20 are usually equal. The lengths of the first clamp 31 and the second clamp 32 are both 40mm to 100mm. The lengths of the various first clamps 31 can be equal or unequal; the lengths of the various second clamps 32 can also be equal or unequal. The length of the first convex ring 41 is related to the distance between the two first sleeves 31 on both sides of the first convex ring 41. The position between the two first sleeves 31 on both sides of the first convex ring 41 can just accommodate the first convex ring 41, and the distance between the two first sleeves 31 on both sides of the first convex ring 41 can be equal to or slightly greater than the length of the first convex ring 41. The length of the second convex ring 42 is related to the distance between the two second sleeves 32 on both sides of the second convex ring 42. The position between the two second sleeves 32 on both sides of the second convex ring 42 can just accommodate the second convex ring 42, and the distance between the two second sleeves 32 on both sides of the second convex ring 42 can be equal to or slightly greater than the length of the second convex ring 42.

[0071] In a preferred embodiment of this utility model, the thickness of the first sleeve 31, the thickness of the second sleeve 32, the thickness of the first convex ring 41, and the thickness of the second convex ring 42 are all 6mm to 10mm.

[0072] Specifically, the thickness of the first sleeve 31 or the thickness of the second sleeve 32 refers to the radial thickness along the pipe (i.e., the first pipe section 10 or the second pipe section 20), and the thickness of the first convex ring 41 or the second convex ring 42 refers to the radial thickness along the pipe (i.e., the first pipe section 10 or the second pipe section 20), which is also the difference between the outer diameter and the inner diameter. The thickness of the first sleeve 31 is usually equal to the thickness of the first convex ring 41, and the thickness of the second sleeve 32 is usually equal to the thickness of the second convex ring 42. The thicknesses of the first sleeve 31, the second sleeve 32, the first convex ring 41, and the second convex ring 42 can all be equal. The thickness of the first sleeve 31, the thickness of the second sleeve 32, the thickness of the first convex ring 41, and the thickness of the second convex ring 42 can all be greater than the thickness of the first pipe section 10, and the thickness of the first sleeve 31, the thickness of the second sleeve 32, the thickness of the first convex ring 41, and the thickness of the second convex ring 42 can all be greater than the thickness of the second pipe section 20.

[0073] The detachable reinforced compression member of this application has the following effects:

[0074] Buckling capacity is significantly improved. According to finite element simulation results, compared with unstrengthened members, the buckling capacity of the strengthened detachable reinforced compression members is significantly improved, and the compressive strength is greatly enhanced.

[0075] Easy to disassemble and recycle. The design uses high-strength bolts for the central connection, making disassembly simple and facilitating subsequent structural maintenance, recycling, and reuse.

[0076] The structural stability is enhanced. The reinforced detachable compression members exhibit more uniform plastic development, and the failure mode changes from mid-span buckling to two-stage compression-bending deformation, thus improving the overall structural stability.

[0077] It aligns with the principles of a circular economy. The design supports the dismantling and reuse of the structure, meeting the demands of modern architecture for a circular economy and reducing resource waste.

[0078] The detachable reinforced compression member at the support end of the space frame structure in this embodiment of the utility model can be obtained by strengthening an existing slender member as the member to be strengthened, specifically as follows:

[0079] Step S100: Based on the dimensions of the rod to be strengthened, determine the dimensions of the first sleeve, the second sleeve, and the sleeve, and prepare the first sleeve, the second sleeve, and the sleeve.

[0080] Step S200: Remove a section of the rod to be strengthened to form a first section of tube and a second section of tube;

[0081] Step S300: Connect the first sleeve to the end of the first pipe section, and connect the second sleeve to the end of the second sleeve;

[0082] Step S400: Place the sleeve on the end of the first section of pipe and the end of the second section of pipe, wherein the first convex ring is located between two adjacent first sleeves and the second convex ring is located between two adjacent second sleeves.

[0083] Specifically, the member to be strengthened can be a member of an existing space frame structure. The members of the existing space frame structure are modified to obtain a detachable strengthened compression member. Based on the dimensions of the member to be strengthened, the dimensions of the first hoop, the second hoop, and the sleeve are determined. The first hoop is prepared based on the dimensions of the first hoop, the second hoop is prepared based on the dimensions of the second hoop, and the sleeve is prepared based on the dimensions of the sleeve.

[0084] A small section is sawn off from the member to be strengthened, resulting in a first tube section and a second tube section, with a gap between them. A first sleeve is attached to the end of the first tube section. A second sleeve is attached to the end of the second tube section. A sleeve is then fitted over the ends of both the first and second tube sections, connecting them to form a detachable strengthened compression member. A first convex ring is engaged between two adjacent first sleeves, and a second convex ring is engaged between two adjacent second sleeves. The member to be strengthened serves as the unstrengthened member or the member before strengthening, while the detachable strengthened compression member serves as the strengthened member. The strengthened member exhibits significantly improved performance compared to the unstrengthened member.

[0085] The dimensions of the member to be strengthened include: the length, thickness, and outer diameter of the member to be strengthened; the dimensions of the first sleeve include: the length, thickness, and inner diameter of the first sleeve; the dimensions of the second sleeve include: the length, thickness, and inner diameter of the second sleeve; the dimensions of the sleeve include: the length of the half-piece, the thickness of the arc-shaped portion, the inner diameter of the arc-shaped portion, the thickness of the extended portion, the thickness of the first convex ring, and the thickness of the second convex ring. The member to be strengthened has the dimensions of length, thickness, and outer diameter. The first sleeve has the dimensions of length, thickness, and inner diameter, with the inner diameter slightly larger than the outer diameter of the member to be strengthened, allowing the first sleeve to fit over the member to be strengthened. The second sleeve has the dimensions of length, thickness, and inner diameter, with the inner diameter slightly larger than the outer diameter of the member to be strengthened, allowing the second sleeve to fit over the member to be strengthened.

[0086] Step S100 specifically includes:

[0087] Step S110: Based on the length, thickness, and outer diameter of the member to be strengthened, construct and optimize the model of the detachable strengthened compression member so that the performance parameters of the optimized model of the detachable strengthened compression member reach the target performance parameters; the performance parameters include at least one of eigenvalue buckling load and nonlinear buckling load.

[0088] Step S120: Based on the optimized model of the detachable reinforced compression member, determine the length of the first sleeve, the length of the second sleeve, the thickness of the first sleeve, the thickness of the second sleeve, the inner diameter of the first sleeve, the inner diameter of the second sleeve, the length of the half piece, the thickness of the arc portion, the inner diameter of the arc portion, the thickness of the extended portion, the thickness of the first convex ring, and the thickness of the second convex ring.

[0089] Step S130: Prepare the first sleeve according to the length, thickness and inner diameter of the first sleeve;

[0090] Step S140: Prepare the second sleeve according to the length, thickness and inner diameter of the second sleeve;

[0091] Step S150: Prepare a sleeve based on the length of the half piece, the thickness of the arc-shaped portion, the inner diameter of the arc-shaped portion, the thickness of the extended portion, the thickness of the first convex ring, and the thickness of the second convex ring.

[0092] Specifically, when constructing the model of the detachable reinforced compression member, the first clamp, second clamp, and sleeve are configured according to the length, thickness, and outer diameter of the member to be reinforced. The mechanical properties of the model are then analyzed and verified using numerical analysis software such as the finite element method (FEM). If the performance parameters of the model do not meet the target performance parameters, the dimensions of the first clamp, second clamp, and sleeve need to be adjusted until the performance parameters of the model reach the target performance parameters. Adjusting the dimensions of the first clamp, second clamp, and sleeve can involve increasing the length of the half-piece, the thickness of the first clamp, the thickness of the second clamp, and the thickness of the curved portion.

[0093] To simplify the model construction and optimization process, the dimensions of some structures in the model have a relatively small impact on performance parameters. After determining the thickness and outer diameter of the member to be strengthened, the dimensions of these structures in the model can be fixed, and only the dimensions of the remaining structures in the model can be adjusted to optimize the performance parameters. For example, the inner diameters of the first and second sleeves are both equal to the outer diameter of the member to be strengthened, so that both the first and second sleeves can fit perfectly over the member. The thickness of the first and second sleeves is the same, and both are equal to the difference between the inner diameter of the sleeve and the outer diameter of the member to be strengthened. The thickness of the first and second convex rings is the same, and the thickness of the first convex ring is the same as the thickness of the first sleeve, and the thickness of the second convex ring is the same as the thickness of the second sleeve. The inner diameter of the arc-shaped portion is equal to the outer diameter of the first (or second) sleeve. The thickness of the arc-shaped portion is the same as the thickness of the first (or second) sleeve, and the thickness of the protruding portion is the same as the thickness of the first (or second) sleeve.

[0094] The length of the half-piece is the sum of the lengths of the first clamp, the second clamp, the first convex ring, the second convex ring, and the gap (i.e., the distance between the ends of the first and second pipe sections, which is also the length of the section removed from the member to be strengthened). The gap is usually 30-40 mm. The length of the first convex ring is usually 1 / 6 to 1 / 5 of the length of the half-piece, and the length of the second convex ring is usually 1 / 6 to 1 / 5 of the length of the half-piece. In a pair of first clamps, the two first clamps can be equal or proportional.

[0095] The structural dimensions such as the thickness of the first clamp, the inner diameter of the first clamp, the thickness of the second clamp, the inner diameter of the second clamp, the thickness of the arc-shaped portion, the inner diameter of the arc-shaped portion, the thickness of the extended portion, the thickness of the first convex ring, the thickness of the second convex ring, and the gap can be fixed, while the structural dimensions such as the length of the half-piece, the length of the first clamp, the length of the second clamp, the length of the first convex ring, and the length of the second convex ring can be adjusted. Therefore, the length of the half-piece is used as the main structural dimension to be adjusted (when the length of the half-piece is adjusted, the other lengths also change accordingly) to optimize performance parameters, and the ratio of the length of the half-piece to the tube length (i.e., the length of the rod to be strengthened) is 1 to 2:10.

[0096] Performance parameters can be derived from eigenvalue buckling loads and / or nonlinear buckling loads, where nonlinear buckling loads are nonlinear buckling loads that take into account initial imperfections. Target performance parameters can be determined based on the requirements of the actual application scenario or based on the performance parameters of the member to be strengthened. For example, the target performance parameter could be 1.4 times the performance parameter of the member to be strengthened, with an improvement of 40% as the objective.

[0097] Taking the initial diagonal web member in a real-world engineering space frame model as an example, a reinforcement design was carried out. The unreinforced member is 3200mm long with a cross-sectional dimension of Φ114×4.0mm. The detailed dimensions of the reinforcement structure for this member were designed, with a semi-circular thickened sleeve section of Φ140×4.0mm selected, and the total length of the member is 3200mm. Based on ABAQUS, eigenvalue buckling and nonlinear buckling analyses considering initial imperfections were performed on the members before and after reinforcement to evaluate the enhancement effect of the compressive buckling bearing capacity. The finite element model of the reinforced member was meshed and contact defined. The unreinforced member was also modeled using solid elements, divided into 64 equal parts along the circumference, with an axial element length of 50mm. Considering the welded ball connection, the boundary conditions were set as rigid connections at both ends, with only one end releasing the axial displacement degree of freedom. An axial compressive unit force was applied to this end for eigenvalue buckling analysis, and the modal solutions of mid-span buckling of the two models were extracted and compared. The eigenvalue buckling load of the unstrengthened member in this mode is approximately 1251 kN, while the eigenvalue buckling load of the strengthened member is approximately 2115 kN, an increase of about 69%.

[0098] Furthermore, initial defects of 1 / 300 of the member length under the current mode are introduced into both models, and nonlinear buckling analysis is performed. The load-displacement curves of the unstrengthened and strengthened members are output as follows: Figure 7As shown, the critical load of the unstrengthened member is 278.8 kN, while the critical load of the strengthened member reaches 392.2 kN, an increase of approximately 40.7%. Furthermore, the plastic development patterns of the two members reveal different failure modes. The unstrengthened member exhibits mid-span buckling following the compressive instability pattern of a slender rod, with plasticity concentrated at the mid-span. In contrast, the strengthened member, due to the increased mid-span stiffness, is divided into two shorter, thicker segments undergoing compressive bending deformation, making plastic development relatively more difficult and thus improving its compressive strength.

[0099] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A detachable reinforced compression member at the support end of a space frame structure, characterized in that, include: The first section of pipe has at least one pair of first sleeves at its end; The second section of pipe has at least one pair of second sleeves at its end; The sleeve has at least one first convex ring and at least one second convex ring; The sleeve is fitted onto the end of the first section of pipe and the end of the second section of pipe; The first convex ring is located between two adjacent first sleeves; The second convex ring is located between two adjacent second sleeves.

2. The detachable reinforced compression member at the support end of the space frame structure according to claim 1, characterized in that, There is a gap between the end of the first section of the pipe and the end of the second section of the pipe.

3. The detachable reinforced compression member at the support end of the space frame structure according to claim 1, characterized in that, The sleeve comprises two halves, which are connected by a connector.

4. The detachable reinforced compression member at the support end of the space frame structure according to claim 3, characterized in that, The half-piece includes: An arc-shaped portion, wherein at least one first semi-ring and at least one second semi-ring are formed on the inner side of the arc-shaped portion; Two extensions are formed at both ends of the arc-shaped portion; The extended portion has a through hole for the connector to pass through and connect. The two halves of the first ring are joined together to form the first convex ring; The two halves of the second ring are joined together to form the second convex ring.

5. The detachable reinforced compression member at the support end of the space frame structure according to claim 4, characterized in that, The connector is a bolt; the thickness of the arc-shaped part and the thickness of the extended part are the same as the thickness of the first section of the pipe; the sum of the length of the first section of the pipe and the length of the second section of the pipe is the pipe length, and the ratio of the length of the half piece to the pipe length is 1 to 2:

10.

6. The detachable reinforced compression member at the support end of the space frame structure according to any one of claims 1-5, characterized in that, Both the first and second pipe sections are made of steel pipe; the sleeve is made of steel cylinder; and both the first and second sleeve hoops are made of steel hoops.

7. The detachable reinforced compression member at the support end of the space frame structure according to claim 6, characterized in that, The first sleeve is welded to the first pipe section on the side opposite to the first convex ring, the first sleeve forms a first guide surface on the side facing the first convex ring, and the first convex ring forms a first chamfer on the side facing the first sleeve.

8. The detachable reinforced compression member at the support end of the space frame structure according to claim 6, characterized in that, The second sleeve is welded to the second pipe section on the side opposite to the second convex ring. The side of the second sleeve facing the second convex ring forms a second guide surface, and the side of the second convex ring facing the second sleeve forms a second chamfer.

9. The detachable reinforced compression member at the support end of the space frame structure according to claim 6, characterized in that, The outer diameter of the first section of the pipe and the outer diameter of the second section of the pipe are both 100mm to 130mm; The lengths of both the first and second sleeves are 40mm to 100mm. The lengths of the first convex ring and the second convex ring are both 80mm to 120mm.

10. The detachable reinforced compression member at the support end of the space frame structure according to claim 6, characterized in that, The thickness of the first sleeve, the thickness of the second sleeve, the thickness of the first convex ring, and the thickness of the second convex ring are all 6mm to 10mm.

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