An equivalent structure of riveted joints with compressed diagonal members

Abstract

The present invention discloses an equivalent structure of a riveted node of a compressed diagonal web, which relates to the technical field of steel truss bridges, and includes an upper equivalent segment, a lower equivalent segment and two local node plates, wherein both sides of the upper equivalent segment and the lower equivalent segment are covered with a local node plate, and the overlapping parts of each local node plate with the upper equivalent segment and the lower equivalent segment are provided with a plurality of full-size rivets, and the lower edge of the local node plate is fixedly connected to the lower equivalent segment by a fillet weld. The equivalent structure of the riveted node of a compressed diagonal web of the present invention can effectively simulate the stress conditions of the prototype of the local structure of the node, and its failure form is basically unaffected. At the same time, the upper equivalent segment and the lower equivalent segment are convenient for loading the equivalent structure of the riveted node of the compressed diagonal web, and the test research can be carried out using universal test equipment, avoiding the need to customize a set of particularly large multi-point loading test equipment, and greatly saving the test cost.

Description

Technical Field

[0001] The invention relates to the technical field of steel truss bridges, in particular to an equivalent structure of a compressed diagonal web riveted node. Background Art

[0002] When studying riveted steel truss bridge joints, the original joints are large, requiring a custom, large-scale multi-point loading test rig to create a full-scale model. Furthermore, due to limitations in hot-head rivet production and construction, scaling down the original joints is difficult. Therefore, it is necessary to cut off the original joints for research.

[0003] like Figure 1a As shown, the original joint consists of the first top chord C, the second top chord D, the compression diagonal E, the tension diagonal F, the vertical web G, and two gusset plates A. The first top chord C, the second top chord D, the compression diagonal E, the tension diagonal F, and the vertical web G are all I-shaped structures. The two gusset plates A cover either side of the first top chord C, the second top chord D, the compression diagonal E, the tension diagonal F, and the vertical web G, respectively. The gusset plates A are connected to the flange plates of the first top chord C, the second top chord D, the compression diagonal E, the tension diagonal F, and the vertical web G via rivets B. The stress analysis shows that the structural characteristics and internal forces of the compression diagonal E and the tension diagonal F are the most important factors determining the failure mode of the joint. At the same time, due to the structural symmetry of the original node and the antisymmetry of the internal forces of the compression diagonal member E and the tension diagonal member F, the original node can be split into two parts along the symmetry axis for separate analysis: one is the compression diagonal member E side, and the other is the tension diagonal member F side. The failure mode of the node is basically unaffected.

[0004] like Figure 1b As shown in the figure, for the node on the side of the compressed diagonal member E, the midline of the first upper chord C and the vertical member G is used as the boundary, and the local structure of the node on the side of the compressed diagonal member E is taken out as the research object, which is called the node local structure prototype T. The intercepted node local structure prototype T contains some idealized boundary conditions and cannot be directly used in experiments in reality. Therefore, an equivalent specimen of the node local structure prototype T that is easy to load is urgently needed. Summary of the Invention

[0005] The purpose of the present invention is to provide an equivalent structure of a compressed diagonal web riveted node to solve the problems existing in the above-mentioned prior art, so that common test equipment can be used to carry out experimental research while ensuring that the failure mode of the node is basically unaffected.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides an equivalent structure of a riveted node of a compressed diagonal web, comprising an upper equivalent segment, a lower equivalent segment and two local node plates, wherein a local node plate is provided on both sides of the upper equivalent segment and the lower equivalent segment, and a plurality of full-size rivets are provided at the overlapping portions of each local node plate with the upper equivalent segment and the lower equivalent segment, and the lower edge of the local node plate is fixedly connected to the lower equivalent segment by a fillet weld.

[0008] Preferably, the upper equivalent segment includes two upper wing plates arranged opposite to each other, a web is arranged between the two upper wing plates, the web and the two upper wing plates form an I-shaped structure, a top plate is arranged at the upper ends of the two upper wing plates, and several upper stiffening plates are arranged between the top plate and the web.

[0009] Preferably, the two upper wing plates and the web plate have the same structure as the compressed diagonal web members in the local structural prototype of the node.

[0010] Preferably, several of the upper stiffening plates are arranged in parallel along the loading direction.

[0011] Preferably, the lower equivalent segment includes two relatively arranged lower wing plates, an L-shaped web is arranged between the two lower wing plates, the L-shaped web is arranged perpendicular to the two lower wing plates, a bottom plate is arranged at the lower ends of the two lower wing plates, and several lower stiffening plates are arranged between the L-shaped web, the bottom plate and the two lower wing plates.

[0012] Preferably, the shape of the upper edge of the lower wing panel is the same as the outline envelope shape of the first upper chord and the vertical web in the node local structure prototype, and the L-shaped web is arranged between the two lower wing panels according to the interception boundary of the node local structure prototype.

[0013] Preferably, several of the lower stiffening plates are arranged in parallel along the loading direction.

[0014] Preferably, a plurality of elongated holes are provided on the bottom plate.

[0015] Preferably, the size and shape of the local node plate are the same as those of the node plate in the node local structure prototype; the number, size and distribution of the full-size rivets are the same as those of the rivets in the node local structure prototype.

[0016] Preferably, the fillet weld is arranged along a cut boundary line of the node local structure prototype.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The present invention uses a local node plate to simulate the node plate in the local structure prototype of the node, a lower equivalent segment to simulate the first upper chord and vertical web part in the local structure prototype of the node, an upper equivalent segment to simulate the compressed diagonal web part in the local structure prototype of the node, and a fillet weld to simulate the constraint effect of the complete node plate in the original node on the extracted local node plate. The equivalent structure of the riveted node with compressed diagonal webs can effectively simulate the stress conditions of the local structure prototype of the node, and its failure form is basically unaffected. At the same time, the upper equivalent segment and the lower equivalent segment facilitate loading the equivalent structure of the riveted node with compressed diagonal webs. When studying riveted steel truss bridge nodes, universal test equipment can be used to carry out test research, avoiding the need to customize a particularly large multi-point loading test device and significantly saving test costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1a Schematic diagram of the original node;

[0021] Figure 1b A schematic diagram of the node local structure prototype is captured;

[0022] Figure 1c is a schematic diagram of the contour envelope;

[0023] Figure 2 Schematic diagram of the equivalent structure of the riveted node of the compressed diagonal web member of the present invention;

[0024] Figure 3 for Figure 2 The main view;

[0025] Figure 4 This is a schematic diagram of the disassembly of the equivalent structure of the compression diagonal web riveted node of the present invention;

[0026] Figure 5 This is a schematic diagram of the disassembly of the lower equivalent segment of the present invention;

[0027] Figure 6 This is a schematic diagram of the disassembly of the upper equivalent segment of the present invention;

[0028] Figure 7 Schematic diagram of the equivalent structure loading of the compression diagonal web riveted node of the present invention;

[0029] Among them: A-node plate, B-rivet, C-first upper chord, D-second upper chord, E-compression diagonal web, F-tension diagonal web, G-vertical web, T-node local structure prototype, 1-local node plate, 2-full-scale rivet, 3-lower equivalent segment, 4-upper equivalent segment, 5-fillet weld, 6-upper flange, 7-web, 8-top plate, 9-upper stiffener, 10-lower flange, 11-L-shaped web, 12-bottom plate, 13-lower stiffener, 14-equivalent structure of compression diagonal web riveted node, 15-press, 16-contour envelope. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The purpose of the present invention is to provide an equivalent structure of a compressed diagonal web riveted node to solve the problems existing in the above-mentioned prior art, so that common test equipment can be used to carry out experimental research while ensuring that the failure mode of the node is basically unaffected.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 2-Figure 7 As shown: This embodiment provides an equivalent structure of a riveted node of a compressed diagonal web member, comprising an upper equivalent segment 4, a lower equivalent segment 3 and two local node plates 1. A local node plate 1 is provided on both sides of the upper equivalent segment 4 and the lower equivalent segment 3. A plurality of full-size rivets 2 are provided at the intersection of each local node plate 1 with the upper equivalent segment 4 and the lower equivalent segment 3. The lower edge of the local node plate 1 (with Figure 3 The placement direction of the middle structure is based on the fixed connection with the lower equivalent segment 3 through the fillet weld 5.

[0034] In this embodiment, the upper equivalent segment 4 includes two upper wing plates 6 arranged opposite to each other, a web 7 is arranged between the two upper wing plates 6, and the web 7 and the two upper wing plates 6 form an I-shaped structure. A top plate 8 is arranged at the upper end of the two upper wing plates 6. The distance between the upper surface of the top plate 8 and the edge of the local node plate 1 is three times the cross-sectional height of the upper equivalent segment 4 (the cross-sectional height of the upper equivalent segment 4 is the height of the I-shaped cross-sectional structure formed by the web 7 and the two upper wing plates 6). Such a length ratio setting can avoid the influence of local stress at the boundary of the upper equivalent segment 4 on the local node plate 1 and prevent the upper equivalent segment 4 from becoming unstable. A number of upper stiffening plates 9 are arranged between the top plate 8 and the web 7. The two upper wing plates 6 and the web 7 have the same structure as the compressed diagonal web member E in the node local structure prototype T. A number of upper stiffening plates 9 are arranged parallel to the loading direction. The upper wing plates 6, the web 7, the top plate 8 and the upper stiffening plates 9 are welded together.

[0035] In this embodiment, the lower equivalent segment 3 includes two lower wing panels 10 arranged opposite to each other, an L-shaped web 11 is arranged between the two lower wing panels 10, the L-shaped web 11 is arranged perpendicular to the two lower wing panels 10, a bottom plate 12 is arranged at the lower end of the two lower wing panels 10, and a plurality of lower stiffening plates 13 are arranged between the L-shaped web 11, the bottom plate 12 and the two lower wing panels 10. Figure 3 The shape of the first upper chord C and the vertical web G in the node local structure prototype T is the same as the outline envelope 16, such as Figure 1c As shown, the outline envelope 16 of the first upper chord C and the vertical web G in the node local structure prototype T is composed of the coincidence line of the intercepted edge of the flange plate of the first upper chord C and the node plate A and its extension line, and the coincidence line of the intercepted edge of the flange plate of the vertical web G and the node plate A and its extension line. The L-shaped web 11 is set between the two lower wing plates 10 according to the interception boundary of the node local structure prototype T. Several lower stiffening plates 13 are set in parallel along the loading direction. Several long strip holes are set on the bottom plate 12 to facilitate construction operations. The lower wing plate 10, L-shaped web 11, bottom plate 12 and lower stiffening plates 13 are welded together.

[0036] In this embodiment, the size and shape of the local gusset plate 1 are identical to those in the local structural prototype T of the node; the number, size, and distribution of the full-scale rivets 2 are identical to those in the local structural prototype T of the node. The lower edge of the local gusset plate 1 is fixedly connected to the lower equivalent segment 3 by a fillet weld 5. The fillet weld 5 is arranged along the interception boundary line of the local structural prototype T of the node. The fillet weld 5 should be welded continuously, and the weld leg size should preferably be slightly smaller than the thickness of the local gusset plate 1.

[0037] In this embodiment, the local node plate 1 simulates the node plate in the node local structure prototype T, the lower equivalent segment 3 simulates the first upper chord C and vertical web G in the node local structure prototype T, the upper equivalent segment 4 simulates the compressed diagonal web E in the node local structure prototype T, and the fillet weld 5 simulates the constraint effect of the complete node plate in the original node on the extracted local node plate 1. The compressed diagonal web riveted node equivalent structure 14 can effectively simulate the stress conditions on the compressed diagonal web E side of the original node, and its failure form is basically unaffected. At the same time, the upper equivalent segment 4 and the lower equivalent segment 3 facilitate loading the compressed diagonal web riveted node equivalent structure 14. When studying riveted steel truss bridge nodes, general test equipment can be used to carry out test research. For example, a large-tonnage press 15 can be used for loading, avoiding the need to customize a particularly large multi-point loading test device and significantly saving test costs.

[0038] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An equivalent structure of a compression diagonal web riveted node, characterized by: It includes an upper equivalent segment, a lower equivalent segment and two local node plates, wherein a local node plate is provided on both sides of the upper equivalent segment and the lower equivalent segment, and a plurality of full-size rivets are provided at the overlapped positions of each local node plate, the upper equivalent segment and the lower equivalent segment, and the lower edge of the local node plate is fixedly connected to the lower equivalent segment by a fillet weld; The upper equivalent segment includes two upper wing plates arranged opposite to each other, a web plate is arranged between the two upper wing plates, the web plate and the two upper wing plates form an I-shaped structure, a top plate is arranged at the upper ends of the two upper wing plates, and a plurality of upper stiffening plates are arranged between the top plate and the web plate; The two upper wing plates and the web plate have the same structure as the compressed diagonal web members in the local structure prototype of the node; The plurality of upper stiffening plates are arranged in parallel along the loading direction; The lower equivalent segment includes two lower wing plates arranged opposite to each other, an L-shaped web plate is arranged between the two lower wing plates, the L-shaped web plate is arranged perpendicular to the two lower wing plates, a bottom plate is arranged at the lower ends of the two lower wing plates, and a plurality of lower stiffening plates are arranged between the L-shaped web plate, the bottom plate and the two lower wing plates; The shape of the upper edge of the lower wing plate is the same as the outline envelope of the first upper chord and the vertical web in the node local structure prototype, and the L-shaped web is arranged between the two lower wing plates according to the interception boundary of the node local structure prototype; The plurality of lower stiffening plates are arranged in parallel along the loading direction; The size and shape of the local gusset plate are the same as those of the gusset plate in the local structure prototype of the node; the number, size and distribution of the full-size rivets are the same as those of the rivets in the local structure prototype of the node; The fillet weld is arranged along a cut boundary line of the local structural prototype of the node.

2. The equivalent structure of the compression diagonal member riveted node according to claim 1, characterized in that: The bottom plate is provided with a plurality of elongated holes.

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