Detachable reinforced compression member at support end of net rack structure and preparation method thereof

Abstract

The application discloses a detachable reinforced compression rod piece of a net rack structure support end and a preparation method thereof. The detachable reinforced compression rod piece comprises a first section pipe, the end of the first section pipe is provided with at least one pair of first hoops, a second section pipe, the end of the second section pipe is provided with at least one pair of second hoops, a sleeve, at least one first convex ring and at least one second convex ring are formed in the sleeve, the sleeve is sleeved on the end of the first section pipe and the end of the second section pipe, the first convex ring is located between two adjacent first hoops, and the second convex ring is located between 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 better than that of the existing slender rod piece, and the buckling bearing capacity of the second section pipe is better than that of the existing slender rod piece. The thickened sleeve provides additional stiffness for the detachable reinforced compression rod piece, thereby further effectively enhancing the anti-buckling capacity of the detachable reinforced compression rod piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grid structure, in particular to a detachable reinforced compression rod at the support end of a grid structure and a preparation method thereof. BACKGROUND

[0002] As a typical long-span space structure, grid structure is widely used in long-span and large-column-net public infrastructure due to its excellent load-bearing performance, strong spatial extension capability and good economic benefits. Since large-span space structures have high redundancy, it is believed that the damage and failure of individual rod members have little effect on the load-bearing capacity of the structure, and will not cause progressive collapse. However, many actual engineering accidents show that although the structure has a high degree of static indeterminacy, progressive collapse is still a major hidden danger in large-span space structures, especially for grid structures commonly used in large urban public buildings. Once a collapse accident occurs, it will inevitably result in greater economic and public safety costs.

[0003] The inclined web member at the support end plays an important role in the load-bearing and anti-collapse process of such grid structures. Many studies have shown that the compression buckling of the inclined web member often marks the beginning of the progressive collapse of the grid structure. Therefore, improving the compression buckling load-bearing capacity of the inclined web member is an important research topic to ensure the safety of the grid structure. The existing methods mainly increase the cross-section of the rod member or improve the material strength, but the compression buckling load-bearing capacity of the rod member in the grid structure still needs to be further improved.

[0004] Therefore, the prior art still needs to be improved and developed. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a detachable reinforced compression rod at the support end of a grid structure and a preparation method thereof, aiming at solving the problem that the compression buckling load-bearing capacity of the rod member in the grid structure still needs to be further improved in the prior art.

[0006] The technical solution adopted by the present application to solve the technical problem is as follows:

[0007] A detachable reinforced compression rod at the support end of a grid structure, comprising:

[0008] a first section of pipe, the end of the first section of pipe being provided with at least one pair of first collars;

[0009] a second section of pipe, the end of the second section of pipe being provided with at least one pair of second collars;

[0010] a sleeve, at least one first protruding ring and at least one second protruding ring being formed in the sleeve;

[0011] wherein the sleeve is sleeved on 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 hoops.

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

[0014] The detachable reinforced compression rod at the end of the support of the space truss structure, wherein a gap exists between the end of the first section of pipe and the end of the second section of pipe.

[0015] The detachable reinforced compression rod at the end of the support of the space truss structure, wherein the sleeve comprises two halves connected by a connecting piece.

[0016] The detachable reinforced compression rod at the end of the support of the space truss structure, wherein the half comprises:

[0017] An arc-shaped portion, the inner side of which forms at least one first half ring and at least one second half ring;

[0018] Two outer extensions formed at the two ends of the arc-shaped portion, respectively;

[0019] Wherein, a through hole is formed on the outer extension, and the connecting piece passes through and connects the through hole;

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

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

[0022] The detachable reinforced compression rod at the end of the support of the space truss structure, wherein the connecting piece is a bolt; the thickness of the arc-shaped portion and the thickness of the outer extension are the same as the thickness of the first section of pipe; the sum of the length of the first section of pipe and the length of the second section of pipe is the pipe length, and the ratio of the length of the half to the pipe length is 1-2:10.

[0023] The detachable reinforced compression rod at the end of the support of the space truss structure, wherein the first section of pipe and the second section of pipe are both steel pipes; the sleeve is a steel cylinder; the first hoop and the second hoop are both steel hoops.

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

[0025] The second sleeve is welded to the second pipe segment on the side away from the second convex ring, and 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 outer diameter of the first pipe segment and the outer diameter of the second pipe segment are both 100mm-130mm.

[0027] The length of the first sleeve and the length of the second sleeve are both 40mm-100mm.

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

[0029] 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-10mm.

[0030] A preparation method of the detachable reinforced compression rod member at the support end of the space truss structure according to any one of the preceding items, comprising the steps of:

[0031] According to the size of the rod to be reinforced, the size of the first sleeve, the size of the second sleeve, and the size of the sleeve are determined, and the first sleeve, the second sleeve, and the sleeve are prepared.

[0032] The rod to be reinforced is removed by a length to form a first pipe segment and a second pipe segment;

[0033] The first sleeve is connected to the end of the first pipe segment, and the second sleeve is connected to the end of the second pipe segment.

[0034] The sleeve is sleeved on the end of the first pipe segment and the end of the second pipe segment, wherein the first convex ring is located between two adjacent first sleeves, and the second convex ring is located between two adjacent second sleeves.

[0035] The preparation method of the detachable reinforced compression rod member at the support end of the space truss structure, wherein the size of the rod to be reinforced includes the length of the rod to be reinforced, the thickness of the rod to be reinforced, and the outer diameter of the rod to be reinforced; the size of the first sleeve includes the length of the first sleeve, the thickness of the first sleeve, and the inner diameter of the first sleeve; the size of the second sleeve includes the length of the second sleeve, the thickness of the second sleeve, and the inner diameter of the second sleeve; and the size of the sleeve includes the length of the half piece, the thickness of the arc-shaped part, the inner diameter of the arc-shaped part, the thickness of the outer extension part, the thickness of the first convex ring, and the thickness of the second convex ring.

[0036] The size of the first sleeve, the size of the second sleeve and the size of the sleeve are determined according to the size of the rod to be reinforced, and the first sleeve, the second sleeve and the sleeve are prepared, comprising:

[0037] Based on the length of the rod to be reinforced, the thickness of the rod to be reinforced and the outer diameter of the rod to be reinforced, a model of the detachable reinforced compression rod is constructed and optimized to make the performance parameter of the optimized model of the detachable reinforced compression rod reach the target performance parameter; the performance parameter includes at least one of the characteristic value buckling load and the nonlinear buckling load;

[0038] Based on the optimized model of the detachable reinforced compression rod, 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-shaped part, the inner diameter of the arc-shaped part, the thickness of the outer extension part, the thickness of the first convex ring and the thickness of the second convex ring are determined;

[0039] The first sleeve is prepared according to the length of the first sleeve, the thickness of the first sleeve and the inner diameter of the first sleeve;

[0040] The second sleeve is prepared according to the length of the second sleeve, the thickness of the second sleeve and the inner diameter of the second sleeve;

[0041] The sleeve is prepared according to the length of the half piece, the thickness of the arc-shaped part, the inner diameter of the arc-shaped part, the thickness of the outer extension part, the thickness of the first convex ring and the thickness of the second convex ring.

[0042] Beneficial effects: the total length of the first section pipe and the second section pipe is close to the existing slender rod, the buckling bearing capacity of the first section pipe is better than that of the existing slender rod, and the buckling bearing capacity of the second section pipe is better than that of the existing slender rod. The thickened sleeve provides additional stiffness for the detachable reinforced compression rod, thereby further effectively enhancing the anti-buckling ability of the detachable reinforced compression rod. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is the first exploded view of the detachable reinforced compression rod in the embodiment of the application.

[0044] Figure 2 is Figure 1 the enlarged view of the sleeve in

[0045] Figure 3 is the first structural schematic view of the sleeve in the embodiment of the application.

[0046] Figure 4 is the second exploded view of the detachable reinforced compression rod in the embodiment of the application.

[0047] Figure 5is a structural schematic diagram of a half piece in an embodiment of the present application.

[0048] Figure 6 is a structural schematic diagram of an end of a first section pipe and an end of a second section pipe in an embodiment of the present application.

[0049] Figure 7 is a third exploded view of a detachable reinforced compression member in an embodiment of the present application.

[0050] Figure 8 is a second structural schematic diagram of a sleeve in an embodiment of the present application.

[0051] Figure 9 is a fourth exploded view of a detachable reinforced compression member in an embodiment of the present application.

[0052] Figure 10 is a schematic diagram of a model of a detachable reinforced compression member in an embodiment of the present application.

[0053] Figure 11 is a comparison diagram of characteristic buckling load of an unreinforced (a) and a reinforced (b) compression member in an embodiment of the present application.

[0054] Figure 12 is a comparison diagram of nonlinear buckling load-displacement curve of an unreinforced and a reinforced compression member in an embodiment of the present application.

[0055] Figure 13 is a simulation diagram of an unreinforced compression member in compression bending in an embodiment of the present application.

[0056] Figure 14 is a simulation diagram of a reinforced compression member in compression bending in an embodiment of the present application.

[0057] Legend of reference signs:

[0058] 10, first section pipe; 20, second section pipe; 31, first sleeve; 311, first guide surface; 32, second sleeve; 321, second guide surface; 40, sleeve; 41, first protruding ring; 411, first half ring; 412, first chamfer; 42, second protruding ring; 421, second half ring; 422, second chamfer; 4a, half piece; 4a1, arc-shaped portion; 4a2, outward extending portion; 4a21, via hole; 4b, connecting piece. DETAILED DESCRIPTION

[0059] In order to make the objectives, technical solutions and advantages of the present application clearer and more explicit, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0060] Please also refer to Figures 1-14The application provides some embodiments of detachable reinforced compression rod members at the support end of a space truss structure.

[0061] As shown in Figures 1-2 the detachable reinforced compression rod member at the support end of the space truss structure of the application comprises:

[0062] a first section of pipe 10, the end of the first section of pipe 10 being provided with at least one pair of first ferrules 31;

[0063] a second section of pipe 20, the end of the second section of pipe 20 being provided with at least one pair of second ferrules 32;

[0064] a sleeve 40, which is formed with at least one first protruding ring 41 and at least one second protruding ring 42;

[0065] wherein the sleeve 40 is sleeved on the end of the first section of pipe 10 and the end of the second section of pipe 20; the first protruding ring 41 is located between two adjacent first ferrules 31; and the second protruding ring 42 is located between two adjacent second ferrules 32.

[0066] In particular, the detachable reinforced compression rod member is applied to a space truss structure, for example, is connected to the support end of the space truss structure, especially the diagonal web member at the support end of the space truss structure. Compared with the existing long rod member (especially the diagonal web member), the length of the first section of pipe 10 is shorter than that of the existing long rod member, the length of the second section of pipe 20 is shorter than that of the existing long rod member, the total length of the first section of pipe 10 and the second section of pipe 20 is close to that of the existing long rod member, the buckling bearing capacity of the first section of pipe 10 is superior to that of the existing long rod member, and the buckling bearing capacity of the second section of pipe 20 is superior to that of the existing long rod member. The sleeve 40 is sleeved on the end of the first section of pipe 10 and the end of the second section of pipe 20, which not only realizes the detachable connection of the first section of pipe 10 and the second section of pipe 20, is conducive to disassembly and recycling, but also can further improve the buckling bearing capacity of the whole detachable reinforced compression rod member.

[0067] In addition, the detachable reinforced compression rod member of the application can be directly prepared, and can also be obtained by modifying the existing long rod member. For example, taking the existing long rod member as a to-be-strengthened rod member, sawing off a small section of the to-be-strengthened rod member to form the first section of pipe 10 and the second section of pipe 20, then adding the sleeve 40 on the first section of pipe 10 and the second section of pipe 20, and connecting the first section of pipe 10 and the second section of pipe 20, as shown in Figure 3 and Figure 8The existing slender rod is modified into the detachable reinforced compression rod. The length of the first section pipe 10 or the length of the second section pipe 20 refers to the length in the axial direction of the pipe (i.e. the first section pipe 10 or the second section pipe 20), the length of the first section pipe 10 is close to the length of the second section pipe 20, for example, the ratio of the length of the first section pipe 10 to the length of the second section pipe 20 is 0.9-1.1:1, and the thickened sleeve 40 is located at the middle region of the detachable reinforced compression rod (i.e. the region where the slender rod is subjected to axial compression buckling failure), and the thickened sleeve 40 provides additional stiffness to the middle region of the detachable reinforced compression rod, thereby further effectively enhancing the buckling resistance of the detachable reinforced compression rod. As shown in Figure 13 As shown in the figure, the middle region of the existing slender rod is subjected to buckling. As shown in Figure 14 As shown in the figure, the detachable reinforced compression rod in the present application does not appear to be subjected to mid-span buckling, but forms two end-bending pipes, thereby changing the axial compression failure mode of the slender rod and improving the axial compression limit bearing capacity.

[0068] The first hoop 31 can be two or more, for example, an even number of first hoops 31 can be used, two first hoops 31 form a pair of first hoops 31 and form a hoop group, each hoop group corresponds to a first protruding ring 41, and the two first hoops 31 in the hoop group form a clamping groove and limit the axial movement of the first protruding ring 41. The second hoop 32 can be two or more, for example, an even number of second hoops 32 can be used, two second hoops 32 form a pair of second hoops 32 and form a hoop group, each hoop group corresponds to a second protruding ring 42, and the two second hoops 32 in the hoop group form a clamping groove and limit the axial movement of the second protruding ring 42. Through the cooperation of the hoop and the protruding ring, the stability and strength of the sleeve 40 when connecting the first section pipe 10 and the second section pipe 20 are ensured. The cooperation and connection of the hoop and the protruding ring need to have sufficient precision to avoid stress concentration or structural instability caused by installation errors.

[0069] In a preferred implementation manner of the embodiment of the present application, as shown in Figure 2 , Figure 4 and Figure 6 , there is a gap between the end of the first section pipe 10 and the end of the second section pipe 20.

[0070] Specifically, the end of the first section pipe 10 and the end of the second section pipe 20 do not directly contact and have a certain spacing therebetween. When the first section pipe 10 or the second section pipe 20 is subjected to force, the end of the first section pipe 10 and the end of the second section pipe 20 also do not directly contact, and the first section pipe 10 and the second section pipe 20 form two relatively independent pipes. Since the length of the sleeve 40 is shorter (much smaller than the length of the first section pipe 10 and also much smaller than the length of the second section pipe 20), the sleeve 40 is not easy to be subjected to buckling and has higher compression resistance.

[0071] In a preferred implementation of the embodiment of the present application, as shown in Figures 2-5 The sleeve 40 comprises two halves 4a connected by a connecting member 4b.

[0072] Specifically, the two halves 4a are connected by the connecting member 4b after being folded, the first convex ring 41 is located between the two first collars 31, and the second convex ring 42 is located between the two second collars 32, thereby realizing the connection of the first pipe segment 10 and the second pipe segment 20. By disassembling the connecting member 4b, the two halves 4a can be disassembled, thereby realizing the disassembly of the entire detachable reinforced pressure member. The two halves 4a can have the same structure.

[0073] In a preferred implementation of the embodiment of the present application, as shown in Figure 2 and Figure 5 The half 4a comprises:

[0074] An arc-shaped portion 4a1, the inner side of the arc-shaped portion 4a1 forming at least one first half ring 411 and at least one second half ring 421;

[0075] Two outward extending portions 4a2 formed at the two ends of the arc-shaped portion 4a1 respectively;

[0076] The outward extending portion 4a2 is provided with a through hole 4a21 for the connecting member 4b to pass through and connect; the first half rings 411 of the two halves 4a are folded to form the first convex ring 41; and the second half rings 421 of the two halves 4a are folded to form the second convex ring 42.

[0077] Specifically, the arc-shaped portion 4a1 is adapted to the end of the first pipe segment 10 and the end of the second pipe segment 20 respectively. The outward extending portion 4a2 extends outward from the arc-shaped portion 4a1, each arc-shaped portion 4a1 has two outward extending portions 4a2, and the two outward extending portions 4a2 are located at the two ends of the arc-shaped portion 4a1 respectively. The outward extending portions 4a2 of the two halves 4a are folded towards each other and connected by the connecting member 4b.

[0078] In a preferred implementation of the embodiment of the present application, as shown in Figure 2 and Figure 4 The connecting member 4b is a bolt.

[0079] Specifically, the connecting member 4b can be a bolt, the bolt passes through the through hole 4a21 to connect the outward extending portions 4a2 of the two halves 4a. The bolt is a high-strength bolt that can withstand a large axial force and shear force, thereby strengthening the stress performance of the half 4a.

[0080] In a preferred implementation of the embodiment of the present application, as shown in Figure 1 and Figure 4As shown, the thickness of the arc-shaped portion 4a1 and the thickness of the overhanging portion 4a2 are both the same as the thickness of the first pipe segment 10; the sum of the length of the first pipe segment 10 and the length of the second pipe segment 20 is the pipe length, and the ratio of the length of the half piece 4a to the pipe length is 1-2:10.

[0081] Specifically, the thickness of the arc-shaped portion 4a1 refers to the thickness in the radial direction of the pipe (i.e., the first pipe segment 10 or the second pipe segment 20), and the thickness is the difference between the outer diameter and the inner diameter. The thickness of the arc-shaped portion 4a1 and the thickness of the overhanging portion 4a2 are both greater than or equal to the thickness of the first pipe segment 10, and the thickness of the arc-shaped portion 4a1 and the thickness of the overhanging portion 4a2 are both greater than or equal to the thickness of the second pipe segment 20. For example, the thickness of the arc-shaped portion 4a1 and the thickness of the overhanging portion 4a2 are both greater than 3 mm, and are selected according to the thickness of the first pipe segment 10 or the thickness of the second pipe segment 20. The length of the half piece 4a refers to the length in the axial direction of the pipe (i.e., the first pipe segment 10 or the second pipe segment 20), and the length of the half piece 4a is the length of the sleeve 40, which accounts for 10-20% of the pipe length.

[0082] In a preferred implementation form of the embodiment of the present application, the first pipe segment 10 and the second pipe segment 20 are both steel pipes; the sleeve 40 is a steel cylinder; and the first sleeve hoop 31 and the second sleeve hoop 32 are both steel hoops.

[0083] Specifically, the first pipe segment 10, the second pipe segment 20, the sleeve 40, the first sleeve hoop 31, and the second sleeve hoop 32 can be made of steel material. The first pipe segment 10 and the second pipe segment 20 are steel pipes, the sleeve 40 is a steel cylinder, and the first sleeve hoop 31 and the second sleeve hoop 32 are steel hoops.

[0084] In a preferred implementation form of the embodiment of the present application, as shown in Figures 6-7 The side of the first sleeve hoop 31 away from the first convex ring 41 is welded to the first pipe segment 10, the side of the first sleeve hoop 31 facing the first convex ring 41 forms a first guide surface 311, and the side of the first convex ring 41 facing the first sleeve hoop 31 forms a first chamfer 412.

[0085] Specifically, when the first sleeve 31 and the first pipe segment 10 are made of steel material, the first sleeve 31 and the first pipe segment 10 can be connected by welding. The first sleeve 31 is formed with a first guide surface 311, and the first convex ring 41 is formed with a first chamfer 412, which can be in contact with the first guide surface 311. The first guide surface 311 is outwardly arranged, and the first chamfer 412 is inwardly arranged. When the sleeve 40 and the first pipe segment 10 move relatively in the axial direction, the first guide surface 311 guides the first chamfer 412, and converts the axial pressure of the first pipe segment 10 into the radial pressure of the sleeve 40. Under the locking effect of the connecting piece 4b, the two halves 4a of the sleeve 40 are not easily spread, and the sleeve 40 is not easily buckled.

[0086] In a preferred implementation of the embodiment of the present application, as shown in Figures 6-7 the second sleeve 32 is welded to the second pipe segment 20 on the side away from the second convex ring 42, and the second sleeve 32 is formed with a second guide surface 321 on the side facing the second convex ring 42, and the second convex ring 42 is formed with a second chamfer 422 on the side facing the second sleeve 32.

[0087] Specifically, when the second sleeve 32 and the second pipe segment 20 are made of steel material, the second sleeve 32 and the second pipe segment 20 can be connected by welding. The second sleeve 32 is formed with a second guide surface 321, and the second convex ring 42 is formed with a second chamfer 422, which can be in contact with the second guide surface 321. The second guide surface 321 is outwardly arranged, and the second chamfer 422 is inwardly arranged. When the sleeve 40 and the second pipe segment 20 move relatively in the axial direction, the second guide surface 321 guides the second chamfer 422, and converts the axial pressure of the second pipe segment 20 into the radial pressure of the sleeve 40. Under the locking effect of the connecting piece 4b, the two halves 4a of the sleeve 40 are not easily spread, and the sleeve 40 is not easily buckled. The included angle between the first guide surface 311 and the first pipe segment 10 is an obtuse angle, for example, the obtuse angle is 110°-130°, and can be 120°. The included angle between the second guide surface 321 and the second pipe segment 20 is an obtuse angle, for example, the obtuse angle is 110°-130°, and can be 120°. The welding of the first sleeve 31 and the first pipe segment 10 and the welding of the second sleeve 32 and the second pipe segment 20 can ensure the close combination and strength consistency of the sleeve and the pipe.

[0088] In a preferred implementation of the embodiment of the present application, as shown in Figure 9 the outer diameter of the first pipe segment 10 and the outer diameter of the second pipe segment 20 are both 100mm-130mm; the length of the first sleeve 31 and the length of the second sleeve 32 are both 40mm-100mm; and the length of the first convex ring 41 and the length of the second convex ring 42 are both 80mm-120mm.

[0089] Specifically, the length of the first collar 31 or the length of the second collar 32 refers to the length along the axial direction of the pipe (i.e. the first pipe section 10 or the second pipe section 20), and the length of the first protruding ring 41 or the length of the second protruding ring 42 refers to the length along the axial direction of the pipe (i.e. the first pipe section 10 or the second pipe section 20). The dimensions of the various components in the rod are generally adjusted according to the requirements of the specific application scenario. In some application scenarios, the outer diameter of the first pipe section 10 and the outer diameter of the second pipe section 20 are both 100mm-130mm, and the outer diameter of the first pipe section 10 and the outer diameter of the second pipe section 20 are generally equal. The length of the first collar 31 and the length of the second collar 32 are both 40mm-100mm, and the length of each first collar 31 can be equal or unequal; the length of each second collar 32 can be equal or unequal. The length of the first protruding ring 41 is related to the distance between the two first collars 31 on the two sides of the first protruding ring 41, and the positions of the two first collars 31 on the two sides of the first protruding ring 41 can just accommodate the first protruding ring 41, and the distance between the two first collars 31 on the two sides of the first protruding ring 41 can be equal to or slightly greater than the length of the first protruding ring 41. The length of the second protruding ring 42 is related to the distance between the two second collars 32 on the two sides of the second protruding ring 42, and the positions of the two second collars 32 on the two sides of the second protruding ring 42 can just accommodate the second protruding ring 42, and the distance between the two second collars 32 on the two sides of the second protruding ring 42 can be equal to or slightly greater than the length of the second protruding ring 42.

[0090] In a preferred implementation manner of the embodiment of the present application, as shown in Figure 9 the thickness of the first collar 31, the thickness of the second collar 32, the thickness of the first protruding ring 41, and the thickness of the second protruding ring 42 are all 6mm-10mm.

[0091] Specifically, the thickness of the first collar 31 or the thickness of the second collar 32 refers to the thickness along the radial direction of the pipe (i.e. the first pipe section 10 or the second pipe section 20), and the thickness of the first protruding ring 41 or the thickness of the second protruding ring 42 refers to the thickness along the radial direction of the pipe (i.e. the first pipe section 10 or the second pipe section 20), and the thickness is the difference between the outer diameter and the inner diameter. The thickness of the first collar 31 is generally equal to the thickness of the first protruding ring 41, and the thickness of the second collar 32 is generally equal to the thickness of the second protruding ring 42. The thickness of the first collar 31, the thickness of the second collar 32, the thickness of the first protruding ring 41, and the thickness of the second protruding ring 42 can all be equal. The thickness of the first collar 31, the thickness of the second collar 32, the thickness of the first protruding ring 41, and the thickness of the second protruding ring 42 can all be greater than the thickness of the first pipe section 10, and the thickness of the first collar 31, the thickness of the second collar 32, the thickness of the first protruding ring 41, and the thickness of the second protruding ring 42 can all be greater than the thickness of the second pipe section 20.

[0092] The detachable reinforced compression member of this application has the following effects:

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] Based on the detachable reinforced compression member at the support end of the space frame structure described in any of the above embodiments, the present invention also provides a preferred embodiment of a method for preparing a detachable reinforced compression member at the support end of the space frame structure:

[0098] The method for preparing the detachable reinforced compression member at the support end of the space frame structure according to an embodiment of the present invention includes the following steps:

[0099] 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.

[0100] Step S200: Remove a section of the rod to be strengthened to form a first section of tube and a second section of tube;

[0101] 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;

[0102] 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.

[0103] 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.

[0104] The to-be-strengthened rod member is sawn off a small section to obtain a first section pipe and a second section pipe, and a gap is formed between the first section pipe and the second section pipe. The first sleeve is connected to the end of the first section pipe. The second sleeve is connected to the end of the second section pipe. Then the sleeve is sleeved on the end of the first section pipe and the end of the second section pipe to connect the first section pipe and the second section pipe to obtain the detachable strengthened compression rod member. The first protruding ring is clamped between two adjacent first sleeves, and the second protruding ring is clamped between two adjacent second sleeves. The to-be-strengthened rod member is the un-strengthened rod member or the pre-strengthened rod member, and the detachable strengthened compression rod member is the post-strengthened rod member, and the performance of the post-strengthened rod member is greatly improved compared with the un-strengthened rod member.

[0105] The size of the to-be-strengthened rod member includes the length, the thickness and the outer diameter of the to-be-strengthened rod member. The size of the first sleeve includes the length, the thickness and the inner diameter of the first sleeve. The size of the second sleeve includes the length, the thickness and the inner diameter of the second sleeve. The size of the sleeve includes the length of the half piece, the thickness of the arc-shaped part, the inner diameter of the arc-shaped part, the thickness of the outward extending part, the thickness of the first protruding ring and the thickness of the second protruding ring. The size of the to-be-strengthened rod member includes the length, the thickness and the outer diameter. The size of the first sleeve includes the length, the thickness and the inner diameter, and the inner diameter of the first sleeve is slightly larger than the outer diameter of the to-be-strengthened rod member, so that the first sleeve can be sleeved outside the to-be-strengthened rod member. The size of the second sleeve includes the length, the thickness and the inner diameter, and the inner diameter of the second sleeve is slightly larger than the outer diameter of the to-be-strengthened rod member, so that the second sleeve can be sleeved outside the to-be-strengthened rod member.

[0106] The step S100 specifically includes:

[0107] The step S110 includes: constructing and optimizing the model of the detachable strengthened compression rod member based on the length, the thickness and the outer diameter of the to-be-strengthened rod member, so that the performance parameter of the optimized model of the detachable strengthened compression rod member reaches the target performance parameter; the performance parameter includes at least one of the eigenvalue buckling load and the nonlinear buckling load.

[0108] The step S120 includes: determining 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-shaped part, the inner diameter of the arc-shaped part, the thickness of the outward extending part, the thickness of the first protruding ring and the thickness of the second protruding ring based on the optimized model of the detachable strengthened compression rod member.

[0109] The step S130 includes: preparing the first sleeve according to the length, the thickness and the inner diameter of the first sleeve.

[0110] Step S140, preparing the second sleeve according to the length of the second sleeve, the thickness of the second sleeve and the inner diameter of the second sleeve;

[0111] Step S150, preparing the sleeve according to the length of the half piece, the thickness of the arc-shaped part, the inner diameter of the arc-shaped part, the thickness of the outer extending part, the thickness of the first convex ring and the thickness of the second convex ring.

[0112] Specifically, when constructing the model of the detachable reinforced compression rod, the first sleeve, the second sleeve and the sleeve are configured according to the length, the thickness and the outer diameter of the rod to be reinforced, and the performance parameters of the model of the detachable reinforced compression rod are analyzed and verified by a numerical analysis software such as a finite element program. If the performance parameters of the model of the detachable reinforced compression rod do not reach the target performance parameters, the sizes of the first sleeve, the second sleeve and the sleeve need to be adjusted until the performance parameters of the model of the detachable reinforced compression rod reach the target performance parameters. The adjustment of the sizes of the first sleeve, the second sleeve and the sleeve can be to increase the length of the half piece, the thickness of the first sleeve, the thickness of the second sleeve and the thickness of the arc-shaped part.

[0113] In order to simplify the construction and optimization process of the model, the sizes of some structures in the model have little effect on the performance parameters. After the thickness of the rod to be reinforced and the outer diameter of the rod to be reinforced are determined, the sizes of these structures in the model can be fixed, and only the sizes of the remaining structures in the model are adjusted to optimize the performance parameters. For example, the inner diameter of the first sleeve and the inner diameter of the second sleeve are equal to the outer diameter of the rod to be reinforced, so that the first sleeve and the second sleeve can be exactly fitted on the rod to be reinforced. The thickness of the first sleeve and the thickness of the second sleeve are the same, and are equal to the difference between the inner diameter of the sleeve and the outer diameter of the rod to be reinforced. The thickness of the first convex ring and the thickness of the second convex ring are 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 part is equal to the outer diameter of the first sleeve (or the second sleeve). The thickness of the arc-shaped part is the same as the thickness of the first sleeve (or the second sleeve), and the thickness of the outer extending part is the same as the thickness of the first sleeve (or the second sleeve).

[0114] The length of the half piece is the sum of the length of the first sleeve, the length of the second sleeve, the length of the first convex ring, the length of the second convex ring and the gap (i.e. the distance between the end of the first section of pipe and the end of the second section of pipe, i.e. the length of the section removed from the rod to be reinforced), and the gap is usually 30-40mm. The length of the first convex ring is usually 1 / 6-1 / 5 of the length of the half piece, and the length of the second convex ring is usually 1 / 6-1 / 5 of the length of the half piece. In a pair of first sleeves, the two first sleeves can be equal or in a ratio.

[0115] The thickness of the first sleeve, the inner diameter of the first sleeve, the thickness of the second sleeve, the inner diameter of the second sleeve, the thickness of the arc-shaped portion, the inner diameter of the arc-shaped portion, the thickness of the overhanging portion, the thickness of the first convex ring, the thickness of the second convex ring, and the gap and other structural dimensions can be fixed, and the length of the half-piece, the length of the first sleeve, the length of the second sleeve, the length of the first convex ring, and the length of the second convex ring and other structural dimensions can be adjusted. Therefore, the length of the half-piece is used as the main adjustment structural dimension (when the length of the half-piece is adjusted, other lengths also change), to optimize the performance parameters, and the ratio of the length of the half-piece to the length of the pipe (i.e., the length of the rod to be strengthened) is 1-2:10.

[0116] The performance parameters can adopt the eigenvalue buckling load and / or the nonlinear buckling load, and the nonlinear buckling load is the nonlinear buckling load considering the initial defect. The target performance parameter can be determined according to the requirements of the actual application scene, or can be determined based on the performance parameter of the rod to be strengthened, for example, the target performance parameter is 1.4 times the performance parameter of the rod to be strengthened, to improve 40% as the target.

[0117] Taking the initial diagonal web member in a certain actual engineering space truss model as an example for strengthening design, the un-strengthened rod has a length of 3200 mm and a cross-sectional size of Φ114*4.0 mm. The strengthening structural detail sizes of the rod are designed as shown in Figure 9 , the cross-sectional size of the half-circle thickened sleeve is selected as Φ140*4.0 mm, and the full length of the rod is 3200 mm. Eigenvalue buckling and nonlinear buckling analysis considering initial defects are performed on the rod before and after strengthening based on ABAQUS, to evaluate the strengthening effect of the compression buckling load of the rod before and after strengthening. The meshing and contact definition of the finite element model of the strengthened rod are shown in Figure 10 , for the sake of clear display of the mesh and contact settings of each component, Figure 10 part of the symmetrical parts is hidden. The un-strengthened rod is also modeled by solid elements, which are equally divided along the circumference and have a length of 50 mm along the axial direction. Considering that the rod is connected by a welded ball, the boundary conditions are set as rigid connection at both ends, and only one end is released from the axial displacement degree of freedom. A unit force is applied to this end for eigenvalue buckling analysis, and the modal solution of the buckling at the midspan of the two models is extracted for comparison as shown in Figure 11 . The eigenvalue buckling load of the un-strengthened rod at this mode is about 1251 kN, while the eigenvalue buckling load of the strengthened rod is about 2115 kN, which increases by about 69%.

[0118] Further, initial defects of 1 / 300 of the length of the rod at the current mode are introduced into the two models respectively, and nonlinear buckling analysis is performed, and the load-displacement curves of the un-strengthened rod and the strengthened rod are output as shown in Figure 12 Figure 12As shown, the critical load of the un-stiffened rod is 278.8 kN, while the critical load of the stiffened rod is 392.2 kN, which is increased by about 40.7%. And from the plastic development shape of the two, it can be seen that the failure modes of the two are not the same. The un-stiffened rod follows the compression instability of the slender rod to occur mid-span buckling, and the plasticity is concentrated in the mid-span development. The stiffened rod is divided into two segments of short and thick rods due to the increase of the middle stiffness, which makes the rod occur compression-bending deformation, and the plasticity development is relatively difficult, thereby improving the compression strength.

[0119] It should be understood that the application of the present application is not limited to the above examples, and those of ordinary skill in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. A method for preparing a detachable reinforced compression member at the end of a support of a space truss structure, characterized by, The method comprises the steps of: determining the size of the first sleeve, the size of the second sleeve and the size of the sleeve according to the size of the rod to be reinforced, and preparing the first sleeve, the second sleeve and the sleeve; the rod to be reinforced is a diagonal web member of a support end of a space truss structure; removing a section of the rod to be reinforced to form a first section pipe and a second section pipe; connecting the first sleeve at the end of the first section pipe and connecting the second sleeve at the end of the second section pipe; sleeving the sleeve at the end of the first section pipe and the end of the second section pipe, wherein a first protruding ring is located between two adjacent first sleeves and a second protruding ring is located between two adjacent second sleeves; the size of the rod to be reinforced includes the length, thickness and outer diameter of the rod to be reinforced; the size of the first sleeve includes the length, thickness and inner diameter of the first sleeve; the size of the second sleeve includes the length, thickness and inner diameter of the second sleeve; and the size of the sleeve includes the length of the half piece, the thickness of the arc-shaped part, the inner diameter of the arc-shaped part, the thickness of the outward extending part, the thickness of the first protruding ring and the thickness of the second protruding ring; determining the size of the first sleeve, the size of the second sleeve and the size of the sleeve according to the size of the rod to be reinforced, and preparing the first sleeve, the second sleeve and the sleeve, comprises: constructing and optimizing the model of the detachable reinforced compression rod based on the length, thickness and outer diameter of the rod to be reinforced, so that the performance parameter of the optimized model of the detachable reinforced compression rod reaches the target performance parameter; the performance parameter includes at least one of the characteristic value buckling load and the nonlinear buckling load; determining 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-shaped part, the inner diameter of the arc-shaped part, the thickness of the outward extending part, the thickness of the first protruding ring and the thickness of the second protruding ring based on the optimized model of the detachable reinforced compression rod; preparing the first sleeve according to the length, thickness and inner diameter of the first sleeve; preparing the second sleeve according to the length, thickness and inner diameter of the second sleeve; preparing the sleeve according to the length of the half piece, the thickness of the arc-shaped part, the inner diameter of the arc-shaped part, the thickness of the outward extending part, the thickness of the first protruding ring and the thickness of the second protruding ring; the first section pipe and the second section pipe are both steel pipes; the sleeve is a steel cylinder; the first sleeve and the second sleeve are both steel sleeves; the outer diameter of the first section pipe and the outer diameter of the second section pipe are both 100mm-130mm; the length of the first sleeve and the length of the second sleeve are both 40mm-100mm; the length of the first protruding ring and the length of the second protruding ring are both 80mm-120mm; the thickness of the first sleeve, the thickness of the second sleeve, the thickness of the first protruding ring and the thickness of the second protruding ring are all 6mm-10mm; There is a gap between the end of the first pipe section and the end of the second pipe section.

2. The method for preparing 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 connected by a connecting member.

3. The method of claim 2, wherein the method further comprises the step of: 3-1) providing a plurality of reinforcing members (30) having a predetermined length and a predetermined width, and 3-2) cutting the reinforcing members (30) to a predetermined length and a predetermined width. The halves comprise: an arc-shaped portion, the inner side of which forms at least one first half-ring and at least one second half-ring; two outer extensions formed at the two ends of the arc-shaped portion, respectively; wherein a through hole is formed on the outer extension for the connecting member to pass through and connect; the first half-rings of the two halves are brought together to form the first convex ring; the second half-rings of the two halves are brought together to form the second convex ring.

4. The method for preparing the detachable reinforced compression member at the support end of the space frame structure according to claim 3, characterized in that, The connecting member is a bolt; the thickness of the arc-shaped portion and the thickness of the outer extension are the same as the thickness of the first pipe section; the sum of the length of the first pipe section and the length of the second pipe section is the pipe length, and the ratio of the length of the halves to the pipe length is 1-2:

10.

5. The method for preparing the detachable reinforced compression member at the support end of the space frame structure according to claim 1, characterized in that, The first ferrule is welded to the first pipe section on the side away from the first convex ring, the side of the first ferrule facing the first convex ring forms a first guide surface, and the side of the first convex ring facing the first ferrule forms a first chamfer; The second ferrule is welded to the second pipe section on the side away from the second convex ring, the side of the second ferrule facing the second convex ring forms a second guide surface, and the side of the second convex ring facing the second ferrule forms a second chamfer.

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