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Method of dynamically calculating steel deck laying mechanical control indexes

A technology of control index and pavement mechanics, which is applied in the field of dynamic calculation of control index of steel bridge deck pavement mechanics, can solve the problem that the change amount and modulus deviation cannot be considered and cannot be used to estimate the key mechanical index of steel bridge deck pavement. Real value and other problems, to achieve the effect of saving labor costs, improving calculation accuracy, and reducing the workload of data entry

Inactive Publication Date: 2017-06-13
SOUTHEAST UNIV
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Problems solved by technology

Since the change of load and the change of elastic modulus under different temperature conditions are not considered, the obtained results can only be used to analyze the trend of stress and strain, and cannot be used to predict the key mechanical indicators of steel bridge deck pavement. actual value
[0003] When using ABAQUS finite element software to analyze the rut depth of steel bridge deck pavement, although the elastic modulus under different temperature conditions is input, for epoxy asphalt mixture, the modulus value is not only related to temperature, but also It is related to the load frequency, so the input elastic modulus still deviates from the real modulus, which will seriously affect the calculation accuracy of the results when the model is solved
Therefore, the static modulus simulation calculation in the finite element software cannot fully reflect the actual changes in the steel bridge deck pavement

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  • Method of dynamically calculating steel deck laying mechanical control indexes
  • Method of dynamically calculating steel deck laying mechanical control indexes
  • Method of dynamically calculating steel deck laying mechanical control indexes

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Embodiment Construction

[0039] The present invention will be further described below with reference to the drawings and embodiments.

[0040] The method for dynamically calculating the mechanical control index of steel bridge deck paving proposed by the present invention includes the following steps:

[0041] Step 1: Obtain the dynamic modulus data of asphalt mixture under different temperatures and different load frequencies (which can be converted into vehicle speed) through the test method, see figure 1 ;

[0042] Step 2: According to the principle of time-temperature equivalence, genetic algorithm is used to analyze and fit the test results, and the dynamic modulus master curve formula of asphalt mixture (at 20℃ reference temperature) (formula 1) and the shift between different temperatures are obtained The factor calculation formula (Formula 2) is as follows:

[0043] Formula 1:

[0044]

[0045] Among them, ln E 0 =6.788, A=2.999, β=3.651, lnωx=ln(freq)+9.882;

[0046] Formula 2:

[0047]

[0048] Where α...

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Abstract

The invention discloses a method of dynamically calculating steel deck laying mechanical control indexes; the method comprises the steps of acquiring asphalt mixture dynamic modulus data under different temperatures and load frequencies; using genetic algorithm to analytically fit test results according to the principle of time-temperature equivalence to obtain an asphalt mixture dynamic modulus main curve formula and a formula of calculating a shift factor between different temperatures; in finite element software, using Fortran language to secondarily develop the two formulas, and using the two formulas as user subprograms for the software; in solving mechanical control indexes, calling a dynamic modulus user subprogram, inputting related parameters to obtain asphalt mixture dynamic modulus, and providing a modulus value for subsequent model calculation. The actual steel deck laying modulus parameters can be simulated truly; in secondary solving of the mechanical control indexes, such as ultimate stress or strain, and calculating precision is improved greatly; data input load is reduced, and manpower cost is saved.

Description

Technical field [0001] The invention relates to the field of dynamic design methods for steel bridge decks, in particular to a dynamic calculation method for mechanical control indexes of steel bridge deck paving. Background technique [0002] In the prior art, when using the ABAQUS finite element software to simulate and calculate the critical mechanical indicators such as the ultimate stress and strain of the steel bridge deck pavement, it is often the modulus parameter of the asphalt mixture at a certain temperature, that is, the static modulus. Analyze and solve the model. Since the change in load and the change in elastic modulus under different temperature conditions are not considered, the results obtained can only be used to analyze the trend of stress and strain, and cannot be used to predict the key mechanical indicators of steel bridge deck paving actual value. [0003] When using ABAQUS finite element software to analyze the rut depth of steel bridge deck pavement, al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06N3/12
CPCG06F30/13G06F30/20G06F30/23G06N3/126
Inventor 罗桑钱振东陆庆王建伟王江洋魏小皓
Owner SOUTHEAST UNIV
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