Manufacturing method of reduced scale model of steel-concrete composite joint and reduced scale model

Abstract

The invention relates to the technical field of steel-concrete double-layer swivel bridges, in particular to a manufacturing method of a reduced scale model of a steel-concrete combined joint and the reduced scale model. The reduced scale model comprises a steel member model corresponding to a steel member of the original bridge steel-concrete composite node and a concrete beam model corresponding to a concrete beam of the original bridge steel-concrete composite node; the method comprises the following steps: acquiring steel member data and concrete beam data of an original bridge steel-concrete composite node; constructing a geometric similarity ratio of the original bridge steel-concrete composite node to the reduced scale model; acquiring data of a steel member model based on the geometric similarity ratio and the steel member data of the original bridge steel-concrete composite node; acquiring data of a concrete beam model based on the geometric similarity ratio and the concrete beam data of the original bridge steel-concrete composite node; and based on the data of the steel member model and the data of the concrete beam model, manufacturing of the reduced scale model is completed. According to the method, the test scale can be reduced, and the stress behavior of the steel-concrete composite node can be fully simulated by the reduced scale model.

Description

Technical Field

[0001] The invention relates to the technical field of steel-concrete double-deck rotating bridges, and in particular to a method for manufacturing a scale model of a steel-concrete combined node and the scale model. Background Art

[0002] Compared with the traditional double-layer steel truss, the lower concrete structure of the steel-concrete double-layer rotating bridge replaces the steel lower chord and the orthotropic steel bridge deck. First, it meets the stress state during the rotation construction process, giving full play to the advantages of the good compressive performance of concrete, avoiding the increase of the plate thickness of the lower steel structure near the support point, saving steel; second, the maintenance workload of the lower concrete beam is small, meeting the requirements for good structural durability and less maintenance and repair workload in the later period. The technical difficulties of the steel-concrete double-layer rotating bridge are reflected in: strong spatiality and complex stress; many system conversions, the structure is a T-structure during the rotation, and it is a continuous beam system after the bridge is completed; the stress of the steel-concrete node is complex, the positioning accuracy of the steel structure is strict, and the quality of concrete pouring is high.

[0003] When using steel-concrete composite nodes to connect the upper steel structure bridge body and the lower concrete bridge body, it is necessary to study the stress performance of the steel-concrete composite nodes. Such stress performance tests are usually destructive or limit tests, so they cannot be directly implemented on the original bridge structure. At the same time, the size of the steel-concrete composite nodes of the original bridge is large. If a 1:1 test model is made, the test cost will increase significantly. Summary of the invention

[0004] In order to realize the mechanical property analysis of the steel-concrete composite node, the present invention provides a method for making a scaled model of the steel-concrete composite node and a scaled model, which can obtain a scaled model with a reduced ratio and can ensure that the scaled model can fully simulate the stress behavior of the steel-concrete composite node of the original bridge.

[0005] According to a method for making a scaled model of a steel-concrete composite node of the present invention, the scaled model includes a steel component model corresponding to the steel component of the original bridge steel-concrete composite node and a concrete beam model corresponding to the concrete beam of the original bridge steel-concrete composite node; the scaled model includes: Obtain the steel component data and concrete beam data of the steel-concrete composite nodes of the original bridge; Construct the geometric similarity ratio between the steel-concrete composite joints of the original bridge and the scaled model; Based on the geometric similarity ratio and the steel component data of the original bridge steel-concrete composite node, the data of the steel component model is obtained; Based on the geometric similarity ratio and the concrete beam data of the original bridge steel-concrete composite node, the data of the concrete beam model is obtained; Based on the data of the steel component model and the concrete beam model, the scale model is produced.

[0006] Preferably, the steel member at the steel-concrete composite node of the original bridge includes a steel plate member and a shear nail member provided at the steel plate member, and the steel member data at the steel-concrete composite node of the original bridge includes the size data of the steel plate member and the size data of the shear nail member; The data of the steel component model is obtained based on the geometric similarity ratio and the steel component data of the original bridge steel-concrete composite node, including: Based on the size data of the steel plate components at the steel-concrete composite nodes of the original bridge, the size data of the steel plate components in the steel component model are obtained; wherein the ratio between the corresponding sizes of the steel component model and the steel plate components corresponding to the steel-concrete composite nodes of the original bridge satisfies the geometric similarity ratio; Based on the size data of the shear stud components at the steel-concrete composite nodes of the original bridge, the size data of the shear stud components in the steel component model are obtained.

[0007] Preferably, the dimension data of the shear nail components at the steel-concrete composite nodes of the original bridge include the cross-sectional area of ​​a single shear nail component, the number of shear nail components, and the spacing between the shear nail components; The step of obtaining the size data of the shear nail components in the steel component model based on the size data of the shear nail components at the steel-concrete composite nodes of the original bridge includes: Construct the cross-sectional area of ​​the shear stud member in the steel member model; Based on the cross-sectional area of ​​a single shear nail component of the shear nail component at the steel-concrete composite node of the original bridge, the number of shear nail components and the spacing between the shear nail components, the number and spacing of the shear nail components in the steel component model are obtained; wherein, the shear nail components in the steel component model and the shear nail components in the steel-concrete composite node of the original bridge have equivalent stiffness.

[0008] Preferably, the concrete beam of the steel-concrete composite node of the original bridge includes a steel skeleton structure and a concrete structure cast and formed at the steel skeleton structure, and the steel skeleton structure includes main bars and reinforcement tied at the main bars; correspondingly, the concrete beam model includes a steel skeleton model and a concrete model; The method of obtaining the data of the concrete beam model based on the geometric similarity ratio and the concrete beam data of the original bridge steel-concrete composite node includes: The main reinforcement parameters in the steel skeleton model are obtained based on the reinforcement ratio of the main reinforcement of the steel skeleton structure; wherein the reinforcement ratio of the main reinforcement of the steel skeleton structure and the steel skeleton model is consistent; The reinforcement parameters in the steel skeleton model are obtained based on the reinforcement ratio of the reinforcement of the steel skeleton structure; wherein the reinforcement ratio of the reinforcement of the steel skeleton structure and the steel skeleton model is consistent.

[0009] Preferably, the concrete beam data includes the cross-sectional area of ​​the concrete beam, the number of main reinforcements and the cross-sectional area of ​​the main reinforcements; The method of obtaining the main reinforcement parameters in the steel skeleton model based on the reinforcement ratio of the main reinforcement of the steel skeleton structure includes: Based on the cross-sectional area of ​​the concrete beam, the number of main bars and the cross-sectional area of ​​the main bars, the reinforcement ratio of the main bars of the steel skeleton structure is obtained; The number of main bars in the steel skeleton model is kept consistent with that in the concrete beam, and the main bar cross-sectional area of ​​the steel skeleton model is obtained based on the reinforcement ratio of the main bars in the steel skeleton structure.

[0010] Preferably, the concrete beam data includes the longitudinal cross-sectional area, stirrup spacing and stirrup cross-sectional area of ​​the concrete beam; The method of obtaining the reinforcement parameters in the steel skeleton model based on the reinforcement ratio of the steel skeleton structure includes: Based on the longitudinal cross-sectional area of ​​the concrete beam, the stirrup spacing and the stirrup cross-sectional area, the reinforcement ratio of the steel skeleton structure is obtained; Given the cross-sectional area of ​​the reinforcement of the steel skeleton model, the spacing of the reinforcement of the steel skeleton model is obtained based on the reinforcement ratio of the reinforcement of the steel skeleton structure.

[0011] Preferably, the manufacturing of the scaled model based on the data of the steel component model and the data of the concrete beam model comprises: Based on the data of the steel component model, complete the production of the steel component model; Based on the data of the concrete beam model, the steel component model and the concrete beam model are formed.

[0012] Preferably, the concrete beam model includes a steel skeleton model and a concrete model; The forming of the steel component model and the concrete beam model based on the data of the concrete beam model includes: Set up a steel bar skeleton model at the steel component model; A concrete model is formed by pouring concrete on the steel skeleton model.

[0013] According to a scaled model of a steel-concrete composite node of the present invention, it includes a steel component model corresponding to the steel component of the original bridge steel-concrete composite node and a concrete beam model corresponding to the concrete beam of the original bridge steel-concrete composite node; wherein the data of the steel component model and the data of the concrete beam model are obtained based on any of the above-mentioned production methods.

[0014] Preferably, the concrete beam model includes a steel skeleton model and a concrete model.

[0015] The present invention has the following beneficial effects: By making a scaled model based on the similarity principle and maintaining the structural form of the original bridge steel-concrete composite node, the test scale can be reduced and the scaled model can fully simulate the stress behavior of the steel-concrete composite node. The size data of the shear stud components in the steel component model can be obtained separately. This method can effectively avoid the problem of the shear stud size being too small after scaling; It can effectively realize that when the concrete beam model is loaded with equivalent load, it can produce stress phenomena similar to those of the concrete beam of the original bridge steel-concrete composite node. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a scaled model in a specific embodiment of the present invention; Figure 2 is a schematic diagram of a steel component model of a scaled model in a specific embodiment of the present invention; Figure 3 The figure is a schematic diagram of a concrete beam model of a scaled model in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0018] See Figure 1-3 In a specific embodiment, the present invention provides a method for making a scaled model of a steel-concrete composite node, wherein the scaled model 200 includes a steel member model 210 corresponding to the steel member of the original bridge steel-concrete composite node and a concrete beam model 220 corresponding to the concrete beam of the original bridge steel-concrete composite node; it includes: Obtain the steel component data and concrete beam data of the steel-concrete composite nodes of the original bridge; Construct the geometric similarity ratio of the original bridge steel-concrete composite node and the scaled model 200; Based on the geometric similarity ratio and the steel component data of the steel-concrete composite node of the original bridge, the data of the steel component model 210 is obtained; Based on the geometric similarity ratio and the concrete beam data of the steel-concrete composite node of the original bridge, the data of the concrete beam model 220 is obtained; Based on the data of the steel member model 210 and the data of the concrete beam model 220 , the scaled model 200 is produced.

[0019] In the above, by making a scaled model based on the similarity principle in a way of maintaining the structural form of the steel-concrete composite node of the original bridge, the scale of the test can be reduced and it can be ensured that the scaled model can fully simulate the stress behavior of the steel-concrete composite node.

[0020] In a specific embodiment, the geometric similarity ratio can be 4.5:1. That is, the size data of a set of corresponding steel plate components in the original bridge steel-concrete composite node and the scaled model 200 are respectively Corresponding to the original bridge steel-concrete composite node and Corresponding to the scaled model 200, it satisfies, ;in is the constructed geometric similarity ratio.

[0021] It can be understood that under this geometric similarity ratio, since the material of the steel-concrete composite node of the original bridge is the same as that of the scaled model, its elastic modulus similarity ratio, density similarity ratio, strain similarity ratio and Poisson similarity ratio are all 1:1, its stress similarity ratio is 20.25:1, and its bending moment similarity ratio is 91.125:1.

[0022] In this embodiment, the steel components at the steel-concrete composite nodes of the original bridge include steel plate components and shear nail components provided at the steel plate components, and the steel component data at the steel-concrete composite nodes of the original bridge include size data of the steel plate components and size data of the shear nail components; The data of the steel component model 210 is obtained based on the geometric similarity ratio and the steel component data of the original bridge steel-concrete composite node, including: Based on the size data of the steel plate components at the steel-concrete composite nodes of the original bridge, the size data of the steel plate components in the steel component model 210 are obtained; wherein the ratio between the corresponding sizes of the steel plate components corresponding to the steel-concrete composite nodes of the original bridge and the steel component model 210 satisfies the geometric similarity ratio; Based on the size data of the shear stud components at the steel-concrete composite nodes of the original bridge, the size data of the shear stud components in the steel component model 210 are obtained.

[0023] Based on the above, the size data of the shear stud components in the steel component model 210 can be obtained separately. This method can effectively avoid the problem of the shear studs being too small in size after scaling.

[0024] In this embodiment, the size data of the shear nail components at the steel-concrete composite nodes of the original bridge include the cross-sectional area of ​​a single shear nail component, the number of shear nail components, and the spacing between the shear nail components; The step of obtaining the size data of the shear nail components in the steel component model 210 based on the size data of the shear nail components at the steel-concrete composite nodes of the original bridge includes: Constructing the cross-sectional area of ​​the shear stud member in the steel member model 210; Based on the cross-sectional area of ​​a single shear nail component of the shear nail component at the steel-concrete composite node of the original bridge, the number of shear nail components and the spacing between the shear nail components, the number and spacing of the shear nail components in the steel component model 210 are obtained; wherein, the shear nail components in the steel component model 210 and the shear nail components in the steel-concrete composite node of the original bridge have equivalent stiffness.

[0025] Based on the above, the shear stud components in the steel component model 210 can have similar stress characteristics to the shear stud components in the steel-concrete composite joint of the original bridge.

[0026] Specifically, the cross-sectional area of ​​the shear stud member in the scaled model 200 is , the number is And the spacing is , and the cross-sectional area of ​​a single shear stud member of the original bridge steel-concrete composite node is , the number of shear stud members and the spacing between shear stud members is , satisfying the following relationship, ; .

[0027] In this embodiment, the concrete beam of the steel-concrete composite node of the original bridge includes a steel skeleton structure and a concrete structure cast and formed at the steel skeleton structure, and the steel skeleton structure includes main bars and reinforcement tied at the main bars; correspondingly, the concrete beam model 220 includes a steel skeleton model and a concrete model; The data of the concrete beam model 220 is obtained based on the geometric similarity ratio and the concrete beam data of the original bridge steel-concrete composite node, including: The main reinforcement parameters in the steel skeleton model are obtained based on the reinforcement ratio of the main reinforcement of the steel skeleton structure; wherein the reinforcement ratio of the main reinforcement of the steel skeleton structure and the steel skeleton model is consistent; The reinforcement parameters in the steel skeleton model are obtained based on the reinforcement ratio of the reinforcement of the steel skeleton structure; wherein the reinforcement ratio of the reinforcement of the steel skeleton structure and the steel skeleton model is consistent.

[0028] Through the above, it can be effectively achieved that when the concrete beam model 220 is loaded with an equivalent load, it can produce a stress phenomenon similar to that of the concrete beam of the steel-concrete composite node of the original bridge.

[0029] In this embodiment, the concrete beam data includes the cross-sectional area of ​​the concrete beam, the number of main bars and the cross-sectional area of ​​the main bars; The method of obtaining the main reinforcement parameters in the steel skeleton model based on the reinforcement ratio of the main reinforcement of the steel skeleton structure includes: Based on the cross-sectional area of ​​the concrete beam, the number of main bars and the cross-sectional area of ​​the main bars, the reinforcement ratio of the main bars of the steel skeleton structure is obtained; The number of main bars in the steel skeleton model is kept consistent with that in the concrete beam, and the main bar cross-sectional area of ​​the steel skeleton model is obtained based on the reinforcement ratio of the main bars in the steel skeleton structure.

[0030] Through the above, the main reinforcement parameters in the reinforcement skeleton model can be effectively obtained.

[0031] In this embodiment, the concrete beam data includes the longitudinal cross-sectional area of ​​the concrete beam, the stirrup spacing and the stirrup cross-sectional area; The method of obtaining the reinforcement parameters in the steel skeleton model based on the reinforcement ratio of the steel skeleton structure includes: Based on the longitudinal cross-sectional area of ​​the concrete beam, the stirrup spacing and the stirrup cross-sectional area, the reinforcement ratio of the steel skeleton structure is obtained; Given the cross-sectional area of ​​the reinforcement of the steel skeleton model, the spacing of the reinforcement of the steel skeleton model is obtained based on the reinforcement ratio of the reinforcement of the steel skeleton structure.

[0032] Through the above, the reinforcement parameters in the steel skeleton model can be effectively acquired.

[0033] Specifically, the reinforcement data of the concrete beam scale model 200 includes the main reinforcement diameter of the concrete beam scale model 200. 、Number of main reinforcement , stirrup diameter and stirrup spacing ;in, Main reinforcement diameter of concrete beam scale model 200 And the number of main reinforcement The main reinforcement diameter of the lower concrete beam of the steel-concrete composite joint of the original bridge 、Number of main reinforcement and geometric similarity ratio Has the following relationship, ; Diameter of stirrups for concrete beam scale model 200 Spacing of stirrups The stirrup diameter of the lower concrete beam of the steel-concrete composite joint with the original bridge , stirrup spacing and geometric similarity ratio Has the following relationship, .

[0034] In this embodiment, the production of the scaled model 200 based on the data of the steel component model 210 and the data of the concrete beam model 220 includes: Based on the data of the steel component model 210 , the steel component model 210 is produced; Based on the data of the concrete beam model 220 , the steel component model 210 and the concrete beam model 220 are formed.

[0035] In this embodiment, the concrete beam model 220 includes a steel skeleton model and a concrete model; The forming of the steel component model 210 and the concrete beam model 220 based on the data of the concrete beam model 220 includes: A steel bar skeleton model is set at the steel component model 210; A concrete model is formed by pouring concrete on the steel skeleton model.

[0036] The scaled model of the steel-concrete composite node produced based on the method of the above embodiment includes a steel component model 210 corresponding to the steel component of the original bridge steel-concrete composite node and a concrete beam model 220 corresponding to the concrete beam of the original bridge steel-concrete composite node; wherein the data of the steel component model 210 and the data of the concrete beam model 220 are obtained based on the above production method.

[0037] The concrete beam model 220 includes a steel bar skeleton model and a concrete model.

[0038] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on one or several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0039] The present invention and its implementation methods are described schematically above, and the description is not restrictive. The embodiments shown in the embodiments are only part of the implementation methods of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the embodiments and designs a structure and an implementation method similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A method for making a scaled model of a steel-concrete composite node, wherein: The scaled model includes a steel component model corresponding to the steel-concrete composite node of the original bridge and a concrete beam model corresponding to the concrete beam of the steel-concrete composite node of the original bridge; it is characterized by comprising: Obtain the steel component data and concrete beam data of the steel-concrete composite nodes of the original bridge; Construct the geometric similarity ratio between the steel-concrete composite joints of the original bridge and the scaled model; Based on the geometric similarity ratio and the steel component data of the original bridge steel-concrete composite node, the data of the steel component model is obtained; Based on the geometric similarity ratio and the concrete beam data of the original bridge steel-concrete composite node, the data of the concrete beam model is obtained; Based on the data of the steel component model and the concrete beam model, the scale model is produced.

2. The method for making a scaled model of a steel-concrete composite node according to claim 1, characterized in that: The steel components at the steel-concrete composite nodes of the original bridge include steel plate components and shear nail components arranged at the steel plate components, and the steel component data at the steel-concrete composite nodes of the original bridge include size data of the steel plate components and size data of the shear nail components; The data of the steel component model is obtained based on the geometric similarity ratio and the steel component data of the original bridge steel-concrete composite node. include, Based on the size data of the steel plate components at the steel-concrete composite nodes of the original bridge, the size data of the steel plate components in the steel component model are obtained; wherein the ratio between the corresponding sizes of the steel component model and the steel plate components corresponding to the steel-concrete composite nodes of the original bridge satisfies the geometric similarity ratio; Based on the size data of the shear stud components at the steel-concrete composite nodes of the original bridge, the size data of the shear stud components in the steel component model are obtained.

3. The method for making a scaled model of a steel-concrete composite node according to claim 2, characterized in that: The dimensional data of the shear nail components at the steel-concrete composite nodes of the original bridge include the cross-sectional area of ​​a single shear nail component, the number of shear nail components, and the spacing between shear nail components; The step of obtaining the size data of the shear nail components in the steel component model based on the size data of the shear nail components at the steel-concrete composite nodes of the original bridge includes: Construct the cross-sectional area of ​​the shear stud member in the steel member model; Based on the cross-sectional area of ​​a single shear nail component of the shear nail component at the steel-concrete composite node of the original bridge, the number of shear nail components and the spacing between the shear nail components, the number and spacing of the shear nail components in the steel component model are obtained; wherein, the shear nail components in the steel component model and the shear nail components in the steel-concrete composite node of the original bridge have equivalent stiffness.

4. The method for making a scaled model of a steel-concrete composite node according to claim 1, characterized in that: The concrete beam of the steel-concrete composite node of the original bridge includes a steel skeleton structure and a concrete structure cast and formed at the steel skeleton structure. The steel skeleton structure includes main bars and reinforcement tied at the main bars. Correspondingly, the concrete beam model includes a steel skeleton model and a concrete model. The method of obtaining the data of the concrete beam model based on the geometric similarity ratio and the concrete beam data of the original bridge steel-concrete composite node includes: The main reinforcement parameters in the steel skeleton model are obtained based on the reinforcement ratio of the main reinforcement of the steel skeleton structure; wherein the reinforcement ratio of the main reinforcement of the steel skeleton structure and the steel skeleton model is consistent; The reinforcement parameters in the steel skeleton model are obtained based on the reinforcement ratio of the reinforcement of the steel skeleton structure; wherein the reinforcement ratio of the reinforcement of the steel skeleton structure and the steel skeleton model is consistent.

5. The method for making a scaled model of a steel-concrete composite node according to claim 4, characterized in that: Concrete beam data include the cross-sectional area of ​​the concrete beam, the number of main reinforcement bars and the cross-sectional area of ​​the main reinforcement bars; The method of obtaining the main reinforcement parameters in the steel skeleton model based on the reinforcement ratio of the main reinforcement of the steel skeleton structure includes: Based on the cross-sectional area of ​​the concrete beam, the number of main bars and the cross-sectional area of ​​the main bars, the reinforcement ratio of the main bars of the steel skeleton structure is obtained; The number of main bars in the steel skeleton model is kept consistent with that in the concrete beam, and the main bar cross-sectional area of ​​the steel skeleton model is obtained based on the reinforcement ratio of the main bars in the steel skeleton structure.

6. The method for making a scaled model of a steel-concrete composite node according to claim 4, characterized in that: Concrete beam data include the longitudinal cross-sectional area of ​​the concrete beam, stirrup spacing and stirrup cross-sectional area; The method of obtaining the reinforcement parameters in the steel skeleton model based on the reinforcement ratio of the steel skeleton structure includes: Based on the longitudinal cross-sectional area of ​​the concrete beam, the stirrup spacing and the stirrup cross-sectional area, the reinforcement ratio of the steel skeleton structure is obtained; Given the cross-sectional area of ​​the reinforcement of the steel skeleton model, the spacing of the reinforcement of the steel skeleton model is obtained based on the reinforcement ratio of the reinforcement of the steel skeleton structure.

7. The method for making a scaled model of a steel-concrete composite node according to claim 4, characterized in that: The scale model is produced based on the data of the steel component model and the data of the concrete beam model, including: Based on the data of the steel component model, the production of the steel component model is completed; Based on the data of the concrete beam model, the steel component model and the concrete beam model are formed.

8. The method for making a scaled model of a steel-concrete composite node according to claim 7, characterized in that: The concrete beam model includes a steel skeleton model and a concrete model; The forming of the steel component model and the concrete beam model based on the data of the concrete beam model includes: Set up a steel bar skeleton model at the steel component model; A concrete model is formed by pouring concrete on the steel skeleton model.

9. The scaled model of the steel-concrete composite node is characterized by: It includes a steel component model of a steel component corresponding to the steel-concrete composite node of the original bridge and a concrete beam model of a concrete beam corresponding to the steel-concrete composite node of the original bridge; wherein the data of the steel component model and the data of the concrete beam model are obtained based on the manufacturing method described in any one of claims 1-8.

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