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Method for calculating fatigue stress of steel bridge deck slab under combined action of vehicle load and temperature

A technology of fatigue stress and steel bridge deck, which is applied in the direction of calculation, special data processing applications, instruments, etc., and can solve problems such as not considering the effect of temperature

Inactive Publication Date: 2013-09-04
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: The present invention aims at the defect that the fatigue problem of the steel bridge deck under the continuous action of the vehicle load does not consider the influence of the temperature effect in the prior art, and provides a method for calculating the fatigue stress of the steel bridge deck under the joint action of the vehicle load and temperature

Method used

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  • Method for calculating fatigue stress of steel bridge deck slab under combined action of vehicle load and temperature
  • Method for calculating fatigue stress of steel bridge deck slab under combined action of vehicle load and temperature
  • Method for calculating fatigue stress of steel bridge deck slab under combined action of vehicle load and temperature

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Embodiment

[0092] Below take the fatigue stress calculation and analysis of the steel deck of the cable-stayed bridge of the north branch of the Runyang Bridge under the joint action of vehicle load and temperature as an example to illustrate the specific implementation process of the present invention:

[0093] (1) The integrated analysis model of the steel bridge deck-pavement layer of the north branch cable-stayed bridge of Runyang Bridge established according to step 1 is as follows: figure 1 As shown, on this basis, the analysis model for the fatigue stress time history calculation of the steel bridge deck welding details under any working condition in step 2) is established:

[0094] ①Determine the standard fatigue vehicle and its loading method: Step 2) The standard fatigue vehicle load model used is as follows: figure 2 and image 3 As shown, considering that the wheel pressure on both sides of the same axis of the standard fatigue vehicle does not affect the calculation result...

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Abstract

The invention discloses a method for calculating the fatigue stress of a steel bridge deck slab under the combined action of a vehicle load and the temperature. The method includes the following steps: building a steel bridge deck slab-pavement layer integrated fatigue analysis model under the combined action of the vehicle load and the temperature, selecting a single standard fatigue vehicle, loading the integrated fatigue analysis model to the fatigue vehicle, calculating fatigue stress time history curves of welding details under predetermined working conditions, on the basis of the curve, building an analysis model for calculating the fatigue stress time history of the welding details under any working condition, and determining the fatigue stress time history of the welding details under the combined action of the vehicle load and the temperature. The calculation method can achieve simulation of the fatigue stress time history of the steel bridge deck slab during any time period, the simulating result can accurately reflect the change rule of the fatigue stress of the steel bridge deck slab in a real operation state, and the method fills the gap that no appropriate method for calculating the fatigue stress of the steel bridge deck slab under the combined action of the vehicle load and the temperature exists in the prior art.

Description

technical field [0001] The invention belongs to the field of fatigue analysis and design of steel bridge decks of long-span cable load-bearing bridge structures, and in particular relates to a method for calculating the fatigue stress of steel bridge decks under the joint action of vehicle load and temperature. Background technique [0002] The factors affecting the fatigue performance of the steel bridge deck include the environment of the bridge structure and the external load. Among them, the vehicle load is the main influencing factor, which has been focused on in the research field of steel bridge deck fatigue. For example, Lin et al. Based on the load data, standard fatigue vehicle models across the country were established. On this basis, the impact of the parameters of the standard fatigue vehicle model on the fatigue damage and Influence law of fatigue life; In addition, studies have shown that ambient temperature will also have an impact on the fatigue performance ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 丁幼亮王高新宋永生
Owner SOUTHEAST UNIV
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