Calculation Method of Fatigue Stress of Steel Bridge Deck Under Joint Action of Vehicle Load and Temperature

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 ...

AI Technical Summary

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

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