Method for calculating component weight of technical condition assessment of composite beam bridge based on stress state

Abstract

The present application relates to the technical field of bridge technical condition assessment, and particularly relates to a method for calculating the weight of a component of a composite girder bridge based on a stress state, according to the actual stress state of each component of a steel plate composite girder bridge, each stress component of the superstructure is divided, and a weight calculation formula of each component is derived, so that the weight distribution of each component is accurately associated with the stress state, the key stress component is accurately identified and targeted maintenance is implemented, the safety performance of the bridge structure is significantly improved, and the maintenance cost is optimized and the life cycle cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge technical condition assessment, in particular to a method for calculating component weight of combined girder bridge technical condition assessment based on stress state. BACKGROUND

[0002] Steel plate composite girder bridge is a combined structure formed by steel girder and concrete bridge deck through shear connectors, which fully utilizes the material properties of high tensile strength of steel and good compressive performance of concrete, and has the advantages of light structure and fast construction, and is widely used in modern bridge engineering. With the increase of service life of steel plate composite girder bridge, its technical condition will gradually deteriorate. How to scientifically assess its technical condition is of great significance for mastering the actual state of bridge structure, identifying bridge safety hazards, ensuring bridge operation safety, and optimizing maintenance resource allocation.

[0003] At present, the Highway Bridge Technical Condition Assessment Standard provides a bridge assessment method combining layered comprehensive assessment and single control index. The division of bridge components and the component weight value directly affect the assessment results. However, the existing standard does not provide specific weight values for each component of steel plate composite girder bridge, resulting in a large subjective and uncertainty in weight selection when maintenance personnel assess the bridge technical condition, which leads to significant fluctuations in the technical condition assessment results and may cover up serious diseases and delay repair opportunities. Therefore, a method for calculating component weight of steel plate composite girder bridge technical condition assessment based on actual stress state is proposed. SUMMARY

[0004] To solve the technical problems existing in the prior art, the present application provides a method for calculating component weight of combined girder bridge technical condition assessment based on stress state.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a method for calculating component weight of combined girder bridge technical condition assessment based on stress state, comprising the following steps:

[0006] Step S1, define the superstructure in a combined girder bridge, which includes steel girder, concrete bridge deck, steel cross beam, middle support bearing and edge support bearing, and each structure in the superstructure is taken as an object for weight calculation;

[0007] Step S2, establish a cross-section property library of the superstructure, which includes the longitudinal bending inertia moment of the concrete bridge deck , the torsional inertia moment of the steel girder , the bending inertia moment of the steel cross beam , the number of steel girders , and the number of steel cross beams per span ;

[0008] Step S3, based on the bending moment of inertia of the steel beam And the longitudinal bending moment of inertia of all concrete bridge decks that participate in bearing the load throughout the entire span. Torsional moment of inertia of steel main beam Moment of inertia of steel beams Longitudinal bending moment of inertia of concrete bridge deck The weighted sum is used to establish the weight value of the steel beam. The calculation formula is used and the calculation is performed;

[0009] Step S4: Based on the contribution ratio of the steel main girder and the bridge deck to the overall bearing capacity of the composite beam bridge, establish the weight values ​​of the steel main girder respectively. Bridge deck weight value The calculation formulas are given and the calculations are performed separately.

[0010] Preferably, the following steps are also included:

[0011] Step S5: Calculate the weight distribution coefficient of the precast slab in the concrete bridge deck based on the area ratio of the precast slab to the wet joint in the concrete bridge deck. Weighting factor of wet joints in concrete bridge deck ;

[0012] Step S6: Based on the reaction force ratios of the edge supports and the middle supports in a combined bridge, give the weight distribution coefficients for the edge supports. And the weight distribution coefficient of the fulcrum support ;

[0013] Step S7: Obtain the weight value of the steel beam based on steps S3 and S4. Weight value of steel main beam Bridge deck weight value ;

[0014] Based on the weight allocation coefficient of the precast slab in the concrete bridge deck obtained in steps S5 and S6 Weighting coefficient of wet joints in concrete bridge deck Weight distribution coefficient of edge support And the weight distribution coefficient of the fulcrum support ;

[0015] The final accurate precast slab weight value was obtained. The wet joint weight value is The weight of the edge support is The weight of the support at the middle fulcrum is .

[0016] Preferably, in step S3, the weight of the steel beam is... The calculation formula (1) is:

[0017]

[0018] In equation (1), For the bending moment of inertia of the steel beam, For the longitudinal bending moment of inertia of the concrete bridge deck, Torsional moment of inertia of the steel main beam denoted as the number of main steel beams, and n as the number of crossbeams per span.

[0019] Preferably, the longitudinal bending moment of inertia of the concrete bridge deck is... The calculation formula (2) is:

[0020]

[0021] In equation (2), The longitudinal length of the bridge deck is taken as 1m. =1m, The thickness of the concrete bridge deck;

[0022] The torsional moment of inertia of the steel main beam The calculation formula (3) is:

[0023]

[0024] In equation (3), The width of the upper flange of the I-shaped section of the steel main beam. The width of the lower flange of the I-shaped section of the steel main beam. The thickness of the upper flange of the I-shaped section of the steel main beam. The thickness of the lower flange of the I-shaped section of the steel main beam. The height of the web of the I-shaped section of the steel main beam. The thickness of the web of the I-shaped section of the steel main beam;

[0025] The bending moment of inertia of the steel beam The calculation formula (4) is:

[0026]

[0027] In equation (4), The thickness of the web of the I-shaped cross-section of the steel beam. The height of the web of the I-shaped cross section of the steel beam. Let be the area of ​​the flange of the I-shaped cross section of the steel beam. It is the distance from the centroid of the flange of the I-shaped section of the steel beam to the neutral axis.

[0028] Preferably, in step S4, the weight value of the steel main beam is... include and Weight value of steel main beam Applicable to simply supported steel plate composite beams and continuous steel plate composite beams in the 0-0.85L side span and 0.15L-0.85L middle span sections. For calculating the span of a continuous steel plate composite beam, the weight value of the main steel beam is given. Applicable to 0.15L sections on both sides of the support in continuous steel plate composite beams;

[0029] The weight value of the steel main beam The calculation formula (5) is:

[0030]

[0031] The weight value of the steel main beam The calculation formula (6) is:

[0032]

[0033] In the formula, For the weight values ​​of the supports of beam bridges, For the weight of the steel beam, The cross-sectional area of ​​the compression zone of the main steel beam in the side span (0–0.85L) and middle span (0.15L–0.85L) of the simply supported steel plate composite beam and the continuous steel plate composite beam is given. This represents the design value of the bending strength of the steel in the main steel beam. This is the distance from the centroid of the tension zone section of the steel main beam to the centroid of the compression zone section of the concrete flange. This is the distance from the centroid of the tension zone section to the centroid of the compression zone section of the steel main beam. This is the calculated width of the concrete bridge deck. This represents the compressive strength value of concrete. The thickness of the concrete bridge deck. This refers to the effective cross-sectional area of ​​the compression flange of the main steel beam within a 0.15L section on each side of the support in a continuous steel plate composite beam. This refers to the distance from the center of the compression flange section of the main steel beam to the centroid of the compression zone section of the main steel beam within a 0.15L section on each side of the support in a continuous steel plate composite beam. This refers to the effective height of the web of the I-shaped section of the main steel beam within a 0.15L section on each side of the support in a continuous steel plate composite beam. This refers to the thickness of the web of the I-shaped section of the main steel beam within a 0.15L section on each side of the support in a continuous steel plate composite beam. This represents the shear force at the support of the continuous steel plate composite beam. This refers to the shear resistance of the web plate at the support in a continuous steel plate composite beam.

[0034] Preferably, in step S4, the weight value of the concrete bridge deck... include and The weight value of concrete bridge deck The weight values ​​for concrete bridge decks are applicable to simply supported steel plate composite beams and continuous steel plate composite beams in the 0-0.85L section of the side span and the 0.15L-0.85L section of the middle span. Applicable to 0.15L sections on both sides of the support in continuous steel plate composite beams;

[0035] The weight value of the concrete bridge deck The calculation formula (7) is:

[0036]

[0037] The weight value of the concrete bridge deck The calculation formula (8) is:

[0038] .

[0039] Preferably, in step S5, the weight distribution coefficient of the precast slab in the concrete bridge deck... include and ;

[0040] The weighting coefficient of the precast slab in the concrete bridge deck The calculation formula (9) is:

[0041]

[0042] The weighting coefficient of the precast slab in the concrete bridge deck The calculation formula (10) is as follows:

[0043]

[0044] In equations (9) and (10), For simply supported steel plate composite beams and continuous steel plate composite beams, the area of ​​the bridge deck in the 0-0.85L section of the side span and the 0.15L-0.85L section of the middle span is given. This refers to the area of ​​the bridge deck within a 0.15L section on each side of the support in a continuous steel plate composite beam. This refers to the area of ​​precast slabs in the side spans (0–0.85L) and middle spans (0.15L–0.85L) of simply supported steel plate composite beams and continuous steel plate composite beams. This refers to the area of ​​the precast slab within the 0.15L section on each side of the support in a continuous steel plate composite beam.

[0045] Preferably, in step S5, the weighting coefficient of the wet joint in the concrete bridge deck is... include and Weighting coefficient of wet joints in concrete bridge deck The calculation formula (11) is as follows:

[0046]

[0047] Weighting factor of wet joints in concrete bridge deck The calculation formula (12) is as follows:

[0048]

[0049] In equations (11) and (12), For simply supported steel plate composite beams and continuous steel plate composite beams, the area of ​​the bridge deck in the 0-0.85L section of the side span and the 0.15L-0.85L section of the middle span is given. This refers to the area of ​​the bridge deck within a 0.15L section on each side of the support in a continuous steel plate composite beam. This refers to the area of ​​wet joints in the side spans (0–0.85L) and middle spans (0.15L–0.85L) of simply supported steel plate composite beams and continuous steel plate composite beams. This refers to the area of ​​the wet joint within a 0.15L section on each side of the support in a continuous steel plate composite beam.

[0050] Preferably, in step S6, for a simply supported beam, a combined bridge is a single-span bridge; for a continuous beam, a combined bridge refers to the portion between one expansion joint and the next expansion joint.

[0051] Preferably, in step S6, the weight allocation coefficient of the edge support point is... The calculation formula (13) is:

[0052]

[0053] Weight distribution coefficient of mid-support point The calculation formula (14) is:

[0054]

[0055] In equations (13) and (14), The resultant force of all support reactions in each span of the bridge. This is the resultant force of the support reactions at all edge supports in each span of the bridge. This is the resultant force of the support reactions at all mid-points in each span of the bridge.

[0056] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0057] 1. This invention provides a method for calculating the weight of components in the technical condition assessment of steel plate composite beam bridges. Based on the actual stress state of each component of the steel plate composite beam bridge, the superstructure is divided into various stress-bearing components, and the weight calculation formula of each component is derived. This enables the weight allocation of each component to be accurately correlated with the stress state, accurately identify key stress-bearing components and implement targeted maintenance, significantly improve the safety performance of the bridge structure, and achieve maintenance cost optimization and reduction of the entire life cycle cost. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0059] The present invention will be further described below with reference to the accompanying drawings and embodiments, which illustrate the above and other technical features and advantages of the present invention. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive.

[0060] Example 1

[0061] like Figure 1 As shown, the method for calculating the component weights in the technical condition assessment of composite beam bridges based on their stress state is characterized by the following steps:

[0062] Step S1: Define the superstructure of a composite beam bridge. The superstructure includes steel main beams, concrete bridge deck, steel crossbeams, central support and side support. Each structure in the superstructure is used as the object of weight calculation.

[0063] Step S2: Establish a section property library for the superstructure, including the longitudinal bending moment of inertia of the concrete bridge deck. Torsional moment of inertia of steel main beam Moment of inertia of steel beams Number of steel main beams The number of steel beams per span ;

[0064] Step S3: Based on the stress characteristics of the steel crossbeam in the steel plate composite beam bridge, establish the weight of the steel crossbeam. The calculation formula is used to calculate the weight value of the steel beam. ;

[0065] In step S3, the weight of the steel beam The calculation formula (1) is:

[0066]

[0067] In equation (1), For the bending moment of inertia of the steel beam, For the longitudinal bending moment of inertia of the concrete bridge deck, Torsional moment of inertia of the steel main beam denoted as the number of main steel beams, and n as the number of crossbeams per span.

[0068] Longitudinal bending moment of inertia of concrete bridge deck The calculation formula (2) is:

[0069]

[0070] In equation (2), The longitudinal length of the bridge deck is taken as 1m. =1m, The thickness of the concrete bridge deck;

[0071] Torsional moment of inertia of steel main beam The calculation formula (3) is:

[0072]

[0073] In equation (3), The width of the upper flange of the I-shaped section of the steel main beam. The width of the lower flange of the I-shaped section of the steel main beam. The thickness of the upper flange of the I-shaped section of the steel main beam. The thickness of the lower flange of the I-shaped section of the steel main beam. The height of the web of the I-shaped section of the steel main beam. The thickness of the web of the I-shaped section of the steel main beam;

[0074] Moment of inertia of steel beam The calculation formula (4) is:

[0075]

[0076] In equation (4), The thickness of the web of the I-shaped cross-section of the steel beam. The height of the web of the I-shaped cross section of the steel beam. Let be the area of ​​the flange of the I-shaped cross section of the steel beam. The distance from the centroid of the flange of the I-shaped cross section of the steel beam to the neutral axis;

[0077] Step S4: Based on the load-bearing capacity contributions of the steel main girder and the bridge deck, establish the steel main girder separately. and bridge deck The weight calculation formula is given, and the weight values ​​of the steel main beam are calculated using the formula. and the weight value of concrete bridge deck ;

[0078] In step S4, the weight value of the main steel beam include and Weight value of steel main beam Applicable to simply supported steel plate composite beams and continuous steel plate composite beams in the 0-0.85L side span and 0.15L-0.85L middle span sections. For calculating the span of a continuous steel plate composite beam, the weight value of the main steel beam is given. It is applicable to the 0.15L section on both sides of the support in a continuous steel plate composite beam.

[0079] Steel main beam weight value The calculation formula (5) is:

[0080]

[0081] Steel main beam weight value The calculation formula (6) is:

[0082]

[0083] In the formula, For the weight values ​​of the supports of beam bridges, For the weight of the steel beam, The cross-sectional area of ​​the compression zone of the main steel beam in the side span (0–0.85L) or middle span (0.15L–0.85L) of a simply supported steel plate composite beam or a continuous steel plate composite beam. This represents the design value of the bending strength of the steel in the main steel beam. This is the distance from the centroid of the tension zone section of the steel main beam to the centroid of the compression zone section of the concrete flange. This is the distance from the centroid of the tension zone section to the centroid of the compression zone section of the steel main beam. This is the calculated width of the concrete bridge deck. This represents the compressive strength value of concrete. The thickness of the concrete bridge deck. This refers to the effective cross-sectional area of ​​the compression flange of the main steel beam within a 0.15L section on each side of the support in a continuous steel plate composite beam. This refers to the distance from the center of the compression flange section of the main steel beam to the centroid of the compression zone section of the main steel beam within a 0.15L section on each side of the support in a continuous steel plate composite beam. This refers to the effective height of the web of the I-shaped section of the main steel beam within a 0.15L section on each side of the support in a continuous steel plate composite beam. This refers to the thickness of the web of the I-shaped section of the main steel beam within a 0.15L section on each side of the support in a continuous steel plate composite beam. This represents the shear force at the support of the continuous steel plate composite beam. This refers to the shear resistance of the web plate at the support in a continuous steel plate composite beam.

[0084] In step S4, the weight value of the concrete bridge deck include and The weight value of concrete bridge deck The weight values ​​for concrete bridge decks are applicable to simply supported steel plate composite beams and continuous steel plate composite beams in the 0-0.85L section of the side span and the 0.15L-0.85L section of the middle span. Applicable to 0.15L sections on both sides of the support in continuous steel plate composite beams;

[0085] Weight value of concrete bridge deck The calculation formula (7) is:

[0086]

[0087] Weight value of concrete bridge deck The calculation formula (8) is:

[0088]

[0089] Step S5: Calculate the weight distribution coefficient of the precast slab in the concrete bridge deck based on the area ratio of the precast slab to the wet joint in the concrete bridge deck. Weighting factor of wet joints in concrete bridge deck ;

[0090] In step S5, the weight distribution coefficient of the precast slab in the concrete bridge deck. include and ;

[0091] Weighting coefficient of precast slabs in concrete bridge deck The calculation formula (9) is:

[0092]

[0093] Weighting coefficient of precast slabs in concrete bridge deck The calculation formula (10) is as follows:

[0094]

[0095] In equations (9) and (10), For simply supported steel plate composite beams and continuous steel plate composite beams, the area of ​​the bridge deck in the 0-0.85L section of the side span and the 0.15L-0.85L section of the middle span is given. This refers to the area of ​​the bridge deck within a 0.15L section on each side of the support in a continuous steel plate composite beam. This refers to the area of ​​precast slabs in the side spans (0–0.85L) and middle spans (0.15L–0.85L) of simply supported steel plate composite beams and continuous steel plate composite beams. This refers to the area of ​​the precast slab within the 0.15L section on each side of the support in a continuous steel plate composite beam.

[0096] In step S5, the weighting coefficient of the wet joint in the concrete bridge deck. include and Weighting coefficient of wet joints in concrete bridge deck The calculation formula (11) is as follows:

[0097]

[0098] Weighting factor of wet joints in concrete bridge deck The calculation formula (12) is as follows:

[0099]

[0100] In equations (11) and (12), For simply supported steel plate composite beams and continuous steel plate composite beams, the area of ​​the bridge deck in the 0-0.85L section of the side span and the 0.15L-0.85L section of the middle span is given. This refers to the area of ​​the bridge deck within a 0.15L section on each side of the support in a continuous steel plate composite beam. This refers to the area of ​​wet joints in the side spans (0–0.85L) and middle spans (0.15L–0.85L) of simply supported steel plate composite beams and continuous steel plate composite beams. This refers to the area of ​​the wet joint within a 0.15L section on each side of the support in a continuous steel plate composite beam.

[0101] Step S6: Based on the reaction force proportions of the edge supports and the middle supports in a single bridge, give the weight distribution coefficients for the edge supports. And the weight distribution coefficient of the fulcrum support ;

[0102] In step S6, for a simply supported beam, a span of bridge is a single span of bridge; for a continuous beam, a span of bridge refers to the part from the beginning of one expansion joint to the end of the next expansion joint.

[0103] In step S6, the weight allocation coefficient of the edge support point is... The calculation formula (13) is:

[0104]

[0105] Weight distribution coefficient of mid-support point The calculation formula (14) is:

[0106]

[0107] In equations (13) and (14), The resultant force of all support reactions in each span of the bridge. This is the resultant force of the support reactions at all edge supports in each span of the bridge. The resultant force of the support reactions at all mid-point supports in each span of the bridge;

[0108] Step S7: Obtain the weight value of the steel beam based on steps S3 and S4. Weight value of steel main beam Bridge deck weight value ;

[0109] Based on the weight allocation coefficient of the precast slab in the concrete bridge deck obtained in steps S5 and S6 Weighting factor of wet joints in concrete bridge deck Weight distribution coefficient of edge support And the weight distribution coefficient of the fulcrum support The precise precast slab weight value is obtained. The wet joint weight value is The weight of the edge support is The weight of the support at the middle fulcrum is The value of 0.12 is given by the relevant specifications for bridge calculation.

[0110] Example 2

[0111] According to the method for calculating the weight of components for assessing the technical condition of a composite beam bridge based on its stress state, this invention performs the following steps to calculate the weight of components for assessing the technical condition of a three-span, single-section 40m steel plate composite beam bridge:

[0112] Step S1: Define the superstructure as including superstructure load-bearing components, superstructure general components and supports. Superstructure load-bearing components include steel main beams and concrete bridge decks. Concrete bridge decks include precast slabs and wet joints. Superstructure general components are steel crossbeams. Supports mainly include edge support supports and center support supports.

[0113] Step S2: Establish the section property library of the superstructure and calculate the longitudinal bending moment of inertia of the concrete bridge deck according to formula (2):

[0114] ;

[0115] Calculate the torsional moment of inertia of the steel main beam according to formula (3):

[0116] ;

[0117] Calculate the moment of inertia of the steel beam according to formula (4):

[0118] ;

[0119] The number of steel beams per span is n=5;

[0120] Step S3: Calculate the weight value of the steel beam according to formula (1):

[0121] ;

[0122] Step S4: Calculate the weight values ​​of the main steel beams in the side spans (0-0.85L) and middle spans (0.15L-0.85L) of the 3×40m steel plate composite beam according to (5). The calculation results are as follows:

[0123]

[0124] ;

[0125] According to (6), the 0.15L sections on both sides of the support in the 3×40m steel plate composite beam are calculated. The calculation results are as follows:

[0126] ;

[0127] Since the flange thickness in the 0.15L section on each side of the support is 60mm, the design value of the bending strength of the support flange steel is... Take 260 N / mm 2 .

[0128] According to (7), the weight values ​​of the concrete bridge deck in the 0~0.85L section of the side span and the 0.15L~0.85L section of the middle span of the 3×40m steel plate composite beam are calculated. The calculation results are as follows:

[0129] ;

[0130] According to (8), the weight values ​​of the concrete bridge deck in the 0.15L section on both sides of the support of the 3×40m steel plate composite beam are calculated. The calculation results are as follows:

[0131] ;

[0132] Since the flange thickness in the 0.15L section on each side of the support is 60mm, the design value of the bending strength of the support flange steel is... Take 260 N / mm 2 .

[0133] Step S5: Calculate the distribution coefficient of the precast slabs in the side span 0~0.85L and the middle span 0.15L~0.85L of the steel plate composite beam according to formula (9). The calculation results are as follows:

[0134] ;

[0135] The distribution coefficient of the precast slabs in the 0.15L section on both sides of the support in the steel plate composite beam is calculated according to formula (10). The calculation results are as follows:

[0136] ;

[0137] The distribution coefficient of wet joints in the side span (0-0.85L) and middle span (0.15L-0.85L) of the steel plate composite beam is calculated according to formula (11). The calculation results are as follows:

[0138] ;

[0139] The distribution coefficient of the wet joint in the 0.15L section on both sides of the support in the steel plate composite beam is calculated according to formula (12). The calculation results are as follows:

[0140] ;

[0141] Step S6: Calculate the weight distribution coefficient of the side support according to formula (13). The weight distribution coefficient of the middle support is calculated according to formula (14). ;

[0142] ;

[0143] ;

[0144] Step S7, based on the above steps, yields:

[0145] The weight of the steel beam is ;

[0146] Weight values ​​of the main steel beams in the side spans (0-0.85L) and middle spans (0.15L-0.85L) of the steel plate composite beam. =0.39, the weight value of the steel main beam in the 0.15L section on each side of the central support. ;

[0147] The weight of the precast slabs in the side spans of the steel plate composite beam (0-0.85L) and the middle span (0.15L-0.85L) is 0.36×0.9=0.324, and the weight of the wet joints is 0.36×0.1=0.036.

[0148] The weight of the precast slabs in the 0.15L section on each side of the support in the steel plate composite beam is... Wet joint weight value Side support weight value The weight value of the support at the middle fulcrum .

[0149] The above are merely preferred embodiments of the present invention and are illustrative in nature, not restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A method for calculating the component weight of a technical condition assessment part of a composite girder bridge based on a force state, characterized by, The method comprises the following steps: Step S1, defining the superstructure of a unit composite beam bridge, the superstructure comprising a steel main beam, a concrete bridge deck slab, a steel cross beam, a middle support bearing and a side support bearing, each structure in the superstructure being taken as an object for weight calculation; Step S2, establishing the cross-section characteristic library of the superstructure, the cross-section characteristic library including the longitudinal bending inertia moment of the concrete bridge deck , the torsional inertia moment of the steel girder , the bending inertia moment of the steel cross beam , the number of the steel girders , the number n of the steel cross beams per span Step S3, the steel beam weight value is calculated according to the steel beam bending moment of inertia , and the longitudinal bending moment of inertia of all the load-bearing concrete bridge deck panels across the bridge , the steel girder torsional moment of inertia , the steel beam bending moment of inertia , and the longitudinal bending moment of inertia of the concrete bridge deck The calculation formula of the steel beam weight value is established and calculated according to the weighted sum of the steel beam bending moment of inertia ​ Step S4, according to the contribution proportion of the steel girder and the bridge deck in the overall bearing capacity of the composite girder bridge, the calculation formula of the steel girder weight value and the bridge deck weight value is established respectively and calculated respectively; Step S5, according to the area ratio of the precast slab and the wet joint in the concrete bridge deck slab, the weight distribution coefficient of the precast slab in the concrete bridge deck slab is calculated respectively and the weight distribution coefficient of the wet joint in the concrete bridge deck slab ; Step S6, according to the proportion of the reaction force of the edge support support and the middle support support in a combination bridge, the weight distribution coefficient of the edge support support and the weight distribution coefficient of the middle support support are respectively given and the middle support support weight distribution coefficient ; Step S7, the steel beam weight value is obtained according to the step S3 and the step S4 , the steel main beam weight value and the deck plate weight value ; The weight distribution factor of the precast slab obtained according to the steps S5 and S6 in the concrete bridge deck slab The weight distribution factor of the wet joint in the concrete bridge deck slab The weight distribution factor of the side support point support The weight distribution factor of the middle support point support ; Finally, the accurate weight value of the precast slab is , the weight value of the wet joint is , the weight value of the edge support point support is , and the weight value of the middle support point support is .

2. The method according to claim 1, wherein the method is characterized by: In the step S3, the weight of the steel beam is calculated The formula (1) for calculating the weight of the steel beam is: ; In formula (1), is the steel beam flexural inertia, is the concrete deck longitudinal flexural inertia, is the steel girder torsional inertia, is the number of steel girders, and n is the number of steel beams per span.

3. The method according to claim 2, wherein the method is characterized by: The concrete bridge deck slab longitudinal bending resistance moment The calculation formula (2) is: ; In formula (2), is the longitudinal length of the bridge deck slab, taken as 1 m in the longitudinal direction, = 1 m, is the thickness of the concrete bridge deck slab; The torsional moment of inertia of the steel girder The formula (3) is: ; In formula (3), is the width of the upper flange of the I-section of the steel girder, is the width of the lower flange of the I-section of the steel girder, is the thickness of the upper flange of the I-section of the steel girder, is the thickness of the lower flange of the I-section of the steel girder, is the height of the web of the I-section of the steel girder, is the thickness of the web of the I-section of the steel girder; The bending moment of inertia of the steel beam The formula (4) is: ; In formula (4), is the thickness of the web of the H-section of the steel beam, is the height of the web of the H-section of the steel beam, is the area of the flange of the H-section of the steel beam, is the distance from the centroid of the flange of the H-section of the steel beam to the neutral axis.

4. The method according to claim 1, wherein the method is characterized by: The steel girder weight value in step S4 comprises and The steel girder weight value in step S4 is suitable for simply supported steel plate composite beams, continuous steel plate composite beams, and edge span 0-0.85L and midspan 0.15L-0.85L sections of continuous steel plate composite beams, The steel girder weight value in step S4 is suitable for 0.15L sections on both sides of the support of continuous steel plate composite beams; The steel girder weight value The calculation formula (5) of the steel girder weight value is: ; The steel girder weight value The calculation formula (6) is: ; In the formula, W is the weight value of the beam bridge support, W is the weight of the steel crossbeam, A is the cross-sectional area of the steel main beam in the compression zone, f is the design value of the bending strength of the steel main beam, H is the distance from the centroid of the cross section of the steel main beam in the tension zone to the centroid of the cross section of the concrete wing slab in the compression zone, H is the distance from the centroid of the cross section of the steel main beam in the tension zone to the centroid of the cross section of the steel main beam in the compression zone, B is the calculated width of the concrete bridge deck, f is the compressive strength value of the concrete, h is the thickness of the concrete bridge deck, A is the effective cross-sectional area of the steel main beam compression flange in the 0.15L section on both sides of the support of the continuous steel plate composite beam, H is the distance from the centroid of the cross section of the steel main beam compression flange in the 0.15L section on both sides of the support of the continuous steel plate composite beam to the centroid of the cross section of the steel main beam in the compression zone, h is the effective height of the steel main beam I-shaped cross-section web in the 0.15L section on both sides of the support of the continuous steel plate composite beam, h is the thickness of the steel main beam I-shaped cross-section web in the 0.15L section on both sides of the support of the continuous steel plate composite beam, V is the shear value at the support of the continuous steel plate composite beam, V is the web shear resistance at the support of the continuous steel plate composite beam.

5. The method according to claim 4, wherein the method is characterized by: The weight value of the concrete bridge deck in the step S4 comprising and The weight value of the concrete bridge deck The weight value of the concrete bridge deck is suitable for the simply supported steel plate composite beam, the edge span 0-0.85L and the midspan 0.15L-0.85L section of the continuous steel plate composite beam The weight value of the concrete bridge deck is suitable for the section of 0.15L on both sides of the support of the continuous steel plate composite beam The weight value of the concrete bridge deck The calculation formula (7) is: ; The weight value of the concrete bridge deck The calculation formula (8) is: 。 6. The method according to claim 1, wherein the method is characterized by: The weight distribution coefficient of the precast slab in the concrete bridge deck in step S5 comprising and ; The weight distribution factor of the precast slab in the concrete bridge deck slab The calculation formula (9) of the weight distribution factor is: ; The weight distribution factor of the precast slab in the concrete bridge deck slab The calculation formula (10) of the weight distribution factor is: ; In formula (9) and (10), The area of the bridge deck in the edge span 0-0.85L and the midspan 0.15L-0.85L section of the simply supported steel plate composite beam, The area of the bridge deck in the 0.15L section on both sides of the support of the continuous steel plate composite beam, The area of the prefabricated plate in the edge span 0-0.85L and the midspan 0.15L-0.85L section of the simply supported steel plate composite beam, The area of the prefabricated plate in the 0.15L section on both sides of the support of the continuous steel plate composite beam.

7. The method according to claim 6, wherein the method is characterized by: In the step S5, the weight distribution coefficient of the wet joint in the concrete bridge deck slab comprising and the weight distribution coefficient of the wet joint in the concrete bridge deck slab The calculation formula (11) is: ; Wet joint weight distribution factor in concrete bridge deck The calculation formula (12) of the wet joint weight distribution factor is: ; In formula (11) and (12), is the area of the bridge deck in the range of 0-0.85L of the side span and 0.15L-0.85L of the midspan of the simply supported steel plate composite beam, is the area of the bridge deck in the range of 0-0.15L of the side span of the continuous steel plate composite beam, is the area of the wet joint in the range of 0-0.85L of the side span and 0.15L-0.85L of the midspan of the simply supported steel plate composite beam, is the area of the wet joint in the range of 0-0.15L of the side span of the continuous steel plate composite beam.

8. The method according to claim 1, wherein the method is characterized by: In the step S6, for a simply supported beam, a unit composite beam bridge is a one-span bridge, and for a continuous beam, a unit composite beam bridge refers to the part between one expansion joint and the next expansion joint.

9. The method according to claim 8, wherein the method is characterized by: In the step S6, the side support point support weight distribution coefficient The calculation formula (13) is: ; Center support bearing weight distribution coefficient The calculation formula (14) is: ; In formulas (13) and (14), is the resultant of all support reactions in each span of the bridge, is the resultant of all edge support reactions in each span of the bridge, is the resultant of all middle support reactions in each span of the bridge.

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