Method for setting camber of steel plate composite beam and steel plate composite beam

Abstract

The present invention discloses a method for setting the camber of a steel plate composite beam and a steel plate composite beam, which relates to the technical field of bridge camber. The method includes: applying the first-stage load during the construction process of the steel plate composite beam to the initial finite element model to obtain the deformation curve of the middle support cross beam of the steel plate composite beam; adjusting the parameters of the middle support cross beam of the initial finite element model to make the deformation of the middle support cross beam zero after applying the first-stage load, and obtaining an updated finite element model; applying the second-stage load during the construction process of the steel plate composite beam to the updated finite element model to obtain the deformation curves of each longitudinal beam of the steel plate composite beam; determining the camber of the middle support cross beam according to the deformation curve of the middle support cross beam, and obtaining the camber of each longitudinal beam according to the deformation curves of each longitudinal beam. The problems in the prior art that after the construction of the concrete bridge deck, the transverse directions of each longitudinal beam are not on the same horizontal plane, the casting quality of the cast-in-place wet joints and cast-in-place sections of the concrete bridge deck is poor, and the paving layer of the bridge deck is unevenly laid are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge cambers, and particularly relates to a method for setting the camber of a steel plate composite beam and a steel plate composite beam. Background Art

[0002] With the development trend of factoryization, standardization, prefabrication, and assembly of urban bridge construction, steel-concrete composite bridges can achieve factory production and rapid on-site assembly, thereby effectively improving construction quality, solving the traffic congestion problem caused by traditional on-site casting construction, and giving full play to the respective advantages of steel and concrete materials, thus improving economy. At the same time, it can also effectively avoid the problem of easy damage to the steel bridge deck pavement, and has broad application prospects.

[0003] For the reconstruction of urban municipal roads, steel plate composite bridges are mostly used. The steel plate beam part adopts a multi-girder structure, with end crossbeams, mid-support crossbeams, and intermediate crossbeams connected into a whole. Then, shear studs are set on the girders, end crossbeams, and mid-support crossbeams, precast slabs are laid, and then the cast-in-place section is poured to form an integral stress structure. Usually, bearings are set at the intersection of each end crossbeam, mid-support crossbeam and each girder, and each bearing is set above the T-shaped capping beam, so that the transverse deformation of each girder is coordinated to ensure that there is no large offset between the precast concrete slabs laid before the cast-in-place wet joint construction, improve the casting quality of the cast-in-place wet joint, and ensure the uniform laying of the bridge deck pavement. With the further increase of urban traffic demand, the width and span of steel plate composite bridges are further increased. The T-shaped capping beam at the intersection where piers cannot be set directly below the bridge and the clearance is limited is no longer applicable, and a frame-type capping beam needs to be used. At this time, the mid-support crossbeam of the steel plate composite beam mostly adopts a steel structure crossbeam to form an invisible capping beam, which has a small structural height and good stress. At this time, the upper structure load is transmitted to the mid-support crossbeam through each girder, and then transmitted to the bridge pier through the bearings arranged at both ends of the mid-support steel crossbeam. The mid-support crossbeam will deflect downward under its own weight.

[0004] In the prior art, according to the conventional method of setting the cambers of the girders and the mid-support crossbeam, the cambers of each girder are not consistent. After the construction of the precast concrete bridge deck, the girders are not on the same horizontal plane transversely, forming an offset, resulting in poor casting quality of the cast-in-place wet joint and cast-in-place section of the concrete bridge deck, and uneven laying of the bridge deck pavement. Summary of the Invention

[0005] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a method for setting the camber of a steel plate composite beam and a steel plate composite beam, which can solve the problem that after the construction of the precast concrete bridge deck in the prior art, the girders are not on the same horizontal plane transversely, forming an offset, resulting in poor casting quality of the cast-in-place wet joint and cast-in-place section of the concrete bridge deck, and uneven laying of the bridge deck pavement.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] On the one hand, this solution provides a method for setting the camber of a steel plate composite beam, including the following steps:

[0008] Apply the first-stage load during the construction process of the steel plate composite beam to the initial finite element model to obtain the deformation curve of the middle support cross beam of the steel plate composite beam;

[0009] Adjust the parameters of the middle support cross beam of the initial finite element model to make the deformation of the middle support cross beam zero after applying the first-stage load, and obtain the updated finite element model;

[0010] Apply the second-stage load during the construction process of the steel plate composite beam to the updated finite element model to obtain the deformation curves of the longitudinal beams of the steel plate composite beam;

[0011] Determine the camber of the middle support cross beam according to the deformation curve of the middle support cross beam, and obtain the cambers of the longitudinal beams according to the deformation curves of the longitudinal beams.

[0012] In some alternative solutions, applying the first-stage load during the construction process of the steel plate composite beam to the initial finite element model to obtain the deformation curve of the middle support cross beam of the steel plate composite beam includes:

[0013] Obtain the element stiffness matrix of each discrete element according to the initial finite element model;

[0014] Integrate the element stiffness matrices into the overall stiffness matrix;

[0015] Apply the first-stage load to the initial finite element model forming the overall stiffness matrix to obtain the load stiffness matrix;

[0016] Obtain the nodal displacement matrix of each discrete element according to the overall stiffness matrix and the load stiffness matrix;

[0017] Obtain the deformation curve of the middle support cross beam after applying the first-stage load according to the nodal displacement matrix of each discrete element.

[0018] In some alternative solutions, adjusting the parameters of the middle support cross beam of the initial finite element model includes:

[0019] Determine the parameters of the middle support cross beam according to the deformation curve of the middle support cross beam.

[0020] In some alternative solutions, applying the second-stage load during the construction process of the steel plate composite beam to the updated finite element model to obtain the deformation curves of the longitudinal beams of the steel plate composite beam includes:

[0021] Obtain the updated element stiffness matrix of each discrete element according to the updated finite element model;

[0022] Integrate the updated element stiffness matrices into the updated overall stiffness matrix;

[0023] Apply the second-stage load to the updated finite element model that forms the updated global stiffness matrix to obtain the updated load stiffness matrix;

[0024] According to the updated global stiffness matrix and the updated load stiffness matrix, obtain the updated nodal displacement matrix of each discrete element;

[0025] According to the updated nodal displacement matrix, obtain the deformation curves of each longitudinal girder after applying the second-stage load.

[0026] In some alternative solutions, the determining the camber of the middle support cross beam according to the deformation curve of the middle support cross beam and obtaining the camber of each longitudinal girder according to the deformation curves of each longitudinal girder includes:

[0027] Set the deformation curve of the middle support cross beam in the reverse direction as the camber of the middle support cross beam;

[0028] Set the deformation curves of each longitudinal girder in the reverse direction as the camber of each longitudinal girder.

[0029] In some alternative solutions, it further includes:

[0030] Before applying the first-stage load of the steel plate composite beam construction process to the initial finite element model to obtain the deformation curve of the middle support cross beam of the steel plate composite beam, establish the initial finite element model according to the bridge span layout and the completed bridge state of the steel plate composite beam.

[0031] In some alternative solutions, in the initial finite element model, the longitudinal girders, end cross beams and middle support cross beams adopt beam elements, and the concrete bridge deck adopts plate elements.

[0032] In some alternative solutions, in the initial finite element model, the plate elements of the concrete bridge deck are connected to the beam elements of the longitudinal girders, end cross beams and middle support cross beams through rigid arms to simulate the connection effect of shear studs, forming a dual-element finite element model of the steel plate composite beam.

[0033] In some alternative solutions, the construction process of the steel plate composite beam includes:

[0034] Erection of the steel plate composite beam, application of the wet weight of the precast bridge deck, formation of the precast bridge deck, application of the wet weight of the cast-in-place concrete slab, formation of the cast-in-place concrete slab, application of the secondary permanent load, operation stage;

[0035] Among them, the first stage includes applying the wet weight of the precast bridge deck and forming the precast bridge deck, and the second stage includes applying the wet weight of the cast-in-place concrete slab, forming the cast-in-place concrete slab and applying the secondary permanent load.

[0036] On the other hand, this solution also provides a steel plate composite beam, the camber of which is set according to the above-mentioned camber setting method of the steel plate composite beam.

[0037] Compared with the prior art, the advantages of the present invention are as follows: In this solution, the first-stage load during the construction process of the steel-concrete composite beam is applied to the initial finite element model to obtain the deformation curve of the middle support cross beam of the steel-concrete composite beam; the parameters of the middle support cross beam of the initial finite element model are adjusted to make the deformation of the middle support cross beam zero after applying the first-stage load, and an updated finite element model is obtained; the second-stage load during the construction process of the steel-concrete composite beam is applied to the updated finite element model to obtain the deformation curves of the longitudinal beams of the steel-concrete composite beam; according to the deformation curve of the middle support cross beam, the pre-camber of the middle support cross beam is determined, and according to the deformation curves of the longitudinal beams, the pre-camber of each longitudinal beam is obtained. This solves the problems in the prior art that after the construction of the precast concrete bridge deck, the transverse levels of the longitudinal beams are not on the same plane, resulting in step formation, poor pouring quality of the cast-in-place wet joints and cast-in-place sections of the concrete bridge deck, and uneven laying of the bridge deck paving layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic diagram of the steps of the method for setting the pre-camber of the steel-concrete composite beam in the embodiment of the present invention;

[0040] Figure 2 It is a schematic diagram of the structure of the steel longitudinal beam, end cross beam and middle support cross beam of the steel-concrete composite beam in the embodiment of the present invention;

[0041] Figure 3 It is a schematic diagram of the structure of the steel-concrete composite beam in the embodiment of the present invention;

[0042] Figure 4 In the embodiment of the present invention Figure 3 The sectional view along a-a;

[0043] Figure 5 In the embodiment of the present invention Figure 3 The sectional view along b-b;

[0044] Figure 6 In the embodiment of the present invention Figure 3 The sectional view along c-c;

[0045] Figure 7 It is a schematic diagram of the pre-camber of the middle support cross beam of the steel-concrete composite beam in the embodiment of the present invention;

[0046] Figure 8 It is a schematic diagram of the pre-camber of the longitudinal beam of the steel-concrete composite beam in the embodiment of the present invention;

[0047] In the figure: 1. Middle support cross beam; 2. Longitudinal beam; 3. End cross beam; 4. Transverse wet joint; 5. Prefabricated bridge deck; 6. Cast-in-place concrete slab. Specific implementation manners

[0048] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0049] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0050] Figures 2 - 6 It is a structural schematic diagram of a steel plate composite beam in an embodiment of the present invention. As Figures 2 - 6 shown, the steel plate composite beam includes: 1. Middle support cross beam; 2. Longitudinal beam; 3. End cross beam; 4. Transverse wet joint; 5. Prefabricated bridge deck; 6. Cast-in-place concrete slab. The camber of the steel plate composite beam is the camber of the middle support cross beam and the camber of the longitudinal beam.

[0051] As Figure 1 shown, on the one hand, the present invention provides a method for setting the camber of a steel plate composite beam, including the following steps:

[0052] S1: Apply the first-stage load during the construction process of the steel plate composite beam to the initial finite element model, and obtain the deformation curve of the middle support cross beam of the steel plate composite beam.

[0053] Step S1 specifically includes:

[0054] S11: Obtain the element stiffness matrix of each discrete element according to the initial finite element model.

[0055] S12: Integrate the element stiffness matrix into the overall stiffness matrix.

[0056] S13: Apply the first-stage load to the initial finite element model forming the overall stiffness matrix, and obtain the load stiffness matrix.

[0057] S14: Obtain the node displacement matrix of each discrete element according to the overall stiffness matrix and the load stiffness matrix.

[0058] S15: Obtain the deformation curve of the middle support cross beam after applying the first-stage load according to the node displacement matrix of each discrete element.

[0059] S2: Adjust the parameters of the middle support crossbeam of the initial finite element model to make the deformation of the middle support crossbeam zero after applying the first-stage load, and obtain the updated finite element model.

[0060] In some alternative embodiments, determine the parameters of the middle support crossbeam according to the deformation curve of the middle support crossbeam.

[0061] In this embodiment, determining the parameters of the middle support crossbeam according to the deformation curve of the middle support crossbeam includes: obtaining the deformation data of the middle support crossbeam according to the deformation curve of the middle support crossbeam, and determining the parameters of the middle support crossbeam that need to be adjusted according to the deformation data.

[0062] S3: Apply the second-stage load during the construction process of the steel plate composite beam to the updated finite element model, and obtain the deformation curves of each longitudinal beam of the steel plate composite beam.

[0063] Step S3 specifically includes:

[0064] S31: Obtain the updated element stiffness matrix of each discrete element according to the updated finite element model.

[0065] S32: Integrate the updated element stiffness matrix into the updated global stiffness matrix.

[0066] S33: Apply the second-stage load to the updated finite element model forming the updated global stiffness matrix, and obtain the updated load stiffness matrix.

[0067] S34: Obtain the updated nodal displacement matrix of each discrete element according to the updated global stiffness matrix and the updated load stiffness matrix.

[0068] S35: Obtain the deformation curves of each longitudinal beam after applying the second-stage load according to the updated nodal displacement matrix.

[0069] S4: Determine the pre-camber of the middle support crossbeam according to the deformation curve of the middle support crossbeam, and obtain the pre-camber of each longitudinal beam according to the deformation curves of each longitudinal beam.

[0070] In some alternative embodiments, set the deformation curve of the middle support crossbeam in the reverse direction as the pre-camber of the middle support crossbeam; set the deformation curves of each longitudinal beam in the reverse direction as the pre-camber of each longitudinal beam. As Figure 7 and Figure 8 shown, Figure 7 is a schematic diagram of the pre-camber of the middle support crossbeam of the steel plate composite beam in the embodiment, Figure 8 and

[0071] In some alternative embodiments, it further includes: before applying the load in the first stage of the construction process of the steel-concrete composite beam to the initial finite element model and obtaining the deformation curve of the middle support cross beam of the steel-concrete composite beam, an initial finite element model is established according to the bridge span layout and the completed bridge state of the steel-concrete composite beam.

[0072] In some alternative embodiments, in the initial finite element model, the longitudinal beams, the end cross beams and the middle support cross beam adopt beam elements, and the concrete bridge deck adopts plate elements.

[0073] In some alternative embodiments, in the initial finite element model, the plate elements of the concrete bridge deck and the beam elements of the longitudinal beams, the end cross beams and the middle support cross beam are connected by rigid arms to simulate the connection effect of shear studs, forming a double-element finite element model of the steel-concrete composite beam.

[0074] In some alternative embodiments, the construction process of the steel-concrete composite beam includes:

[0075] erection of the steel-concrete composite beam, application of the wet weight of the precast bridge deck, shaping of the precast bridge deck, application of the wet weight of the cast-in-situ concrete slab, shaping of the cast-in-situ concrete slab, application of the secondary dead load, and operation stage;

[0076] Wherein, the first stage includes the application of the wet weight of the precast bridge deck and the shaping of the precast bridge deck, and the second stage includes the application of the wet weight of the cast-in-situ concrete slab, the shaping of the cast-in-situ concrete slab and the application of the secondary dead load.

[0077] In this embodiment, the operation stage includes the loads provided by the live load, temperature and wind of the bridge.

[0078] On the other hand, the present invention provides a steel-concrete composite beam, the camber of which is set according to the above-mentioned camber setting method of the steel-concrete composite beam.

[0079] To sum up, the present invention applies the load in the first stage of the construction process of the steel-concrete composite beam to the initial finite element model to obtain the deformation curve of the middle support cross beam of the steel-concrete composite beam; adjusts the parameters of the middle support cross beam of the initial finite element model to make the deformation of the middle support cross beam zero after applying the load in the first stage, and obtains an updated finite element model; applies the load in the second stage of the construction process of the steel-concrete composite beam to the updated finite element model to obtain the deformation curves of the longitudinal beams of the steel-concrete composite beam; determines the camber of the middle support cross beam according to the deformation curve of the middle support cross beam, and obtains the cambers of the longitudinal beams according to the deformation curves of the longitudinal beams. It solves the problems in the prior art that after the construction of the precast concrete bridge deck, the longitudinal beams are not on the same horizontal plane transversely, forming a step, resulting in poor quality of the cast-in-place wet joint and cast-in-place section of the concrete bridge deck, and uneven laying of the bridge deck pavement layer.

[0080] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0081] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0082] The above description is only the specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for setting the camber of a steel plate composite beam, characterized in that, It includes the following steps: Apply the load of the first stage of the construction process of the steel-concrete composite beam to the initial finite element model, and obtain the deformation curve of the middle support cross beam of the steel-concrete composite beam; Adjust the parameters of the middle support cross beam of the initial finite element model to make the deformation of the middle support cross beam zero after applying the load of the first stage, and obtain the updated finite element model; Apply the load of the second stage of the construction process of the steel-concrete composite beam to the updated finite element model, and obtain the deformation curves of each longitudinal beam of the steel-concrete composite beam; Determine the camber of the middle support cross beam according to the deformation curve of the middle support cross beam, and obtain the camber of each longitudinal beam according to the deformation curves of each longitudinal beam; The step of applying the load of the first stage of the construction process of the steel-concrete composite beam to the initial finite element model and obtaining the deformation curve of the middle support cross beam of the steel-concrete composite beam includes: According to the initial finite element model, obtain the element stiffness matrix of each discrete element; Integrate the element stiffness matrix into the global stiffness matrix; Apply the load of the first stage to the initial finite element model forming the global stiffness matrix to obtain the load stiffness matrix; According to the global stiffness matrix and the load stiffness matrix, obtain the node displacement matrix of each discrete element; According to the node displacement matrix of each discrete element, obtain the deformation curve of the middle support cross beam after applying the load of the first stage; The step of applying the load of the second stage of the construction process of the steel-concrete composite beam to the updated finite element model and obtaining the deformation curves of each longitudinal beam of the steel-concrete composite beam includes: According to the updated finite element model, obtain the updated element stiffness matrix of each discrete element; Integrate the updated element stiffness matrix into the updated global stiffness matrix; Apply the load of the second stage to the updated finite element model forming the updated global stiffness matrix to obtain the updated load stiffness matrix; According to the updated global stiffness matrix and the updated load stiffness matrix, obtain the updated node displacement matrix of each discrete element; According to the updated node displacement matrix, obtain the deformation curves of each longitudinal beam after applying the load of the second stage.

2. The method for setting the camber of a steel plate composite beam according to claim 1, wherein, The step of adjusting the parameters of the middle support cross beam of the initial finite element model includes: Determine the parameters of the middle support cross beam according to the deformation curve of the middle support cross beam.

3. The method for setting the camber of the steel plate composite beam according to claim 1, characterized in that, The step of determining the camber of the middle support cross beam according to the deformation curve of the middle support cross beam and obtaining the camber of each longitudinal beam according to the deformation curves of each longitudinal beam includes: Set the deformation curve of the middle support cross beam in the reverse direction as the camber of the middle support cross beam; Set the deformation curves of each longitudinal beam in the reverse direction as the camber of each longitudinal beam.

4. The method for setting the camber of a steel plate composite beam according to claim 1, characterized in that, It also includes: Before applying the load of the first stage of the construction process of the steel-concrete composite beam to the initial finite element model and obtaining the deformation curve of the middle support cross beam of the steel-concrete composite beam, establish the initial finite element model according to the bridge span layout and the completed bridge state of the steel-concrete composite beam.

5. The method for setting the camber of a steel plate composite beam according to claim 4, wherein In the initial finite element model, the longitudinal beam, the end cross beam and the middle support cross beam adopt beam elements, and the concrete bridge deck adopts plate elements.

6. The method for setting the camber of a steel plate composite beam as described in claim 5, characterized in that, In the initial finite element model, the plate elements of the concrete bridge deck and the beam elements of the longitudinal beam, the end cross beam and the middle support cross beam are connected by rigid arms to simulate the connection effect of shear studs, forming a double-element finite element model of the steel-concrete composite beam.

7. The method for setting the camber of a steel plate composite beam as described in claim 1, wherein The construction process of the steel-concrete composite beam includes: Erection of the steel-concrete composite beam, application of the wet weight of the precast bridge deck, formation of the precast bridge deck, application of the wet weight of the cast-in-place concrete slab, formation of the cast-in-place concrete slab, application of the secondary dead load, and operation stage; Among them, the first stage includes applying the wet weight of the precast bridge deck and forming the precast bridge deck, and the second stage includes applying the wet weight of the cast-in-place concrete slab, forming the cast-in-place concrete slab, and applying the secondary dead load.

8. A steel plate composite beam, characterized in that, Its camber is set according to the method for setting the camber of the steel plate composite beam according to any one of claims 1-7.

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