Method and device for calculating fatigue life of suspension bridge sling

Abstract

The invention provides a method and a device for calculating the fatigue life of a suspension bridge sling. The method comprises the following steps: collecting the vehicle load data of a suspension bridge within preset days to reconstruct the vehicle load flow of the suspension bridge sling every day; establishing a three-dimensional space finite element model of the suspension bridge, and basedon the three-dimensional space finite element model, calculating the internal force of the sling under the action of dead load and obtaining the continuous influence surface of the internal force of the sling; loading the reconstructed vehicle load flow of every day to the continuous influence surface of the internal force of the sling to obtain the internal force time travel curve of the sling every day generated by the vehicle load; and according to the internal force time travel curve and the internal force under the action of the dead load, obtaining the fatigue damage of the sling every day, and determining the fatigue life according to the fatigue damage of the sling every day within the preset days. With adoption of the method, the calculation deviation caused by the randomness of the vehicle load data within a short period is avoided.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, and more specifically, to a calculation method and a device for fatigue life of suspension bridge suspension cables. Background technique [0002] The suspension cable is the key stress-bearing component of the suspension bridge, and the stress state of the suspension cable is directly related to the overall safety status and performance of the suspension bridge. However, due to the continuous increase in the number of heavy-duty vehicles on the road, the vehicle load level borne by the bridge structure is also increasing, which makes the fatigue problem of the bridge structure increasingly prominent. The test results of real bridges at home and abroad show that even if the design service life is far from being reached, some suspension bridge suspension cables have the phenomenon of steel wire fatigue fracture. Therefore, a scientific and reasonable calculation and analysis method for ...

AI Technical Summary

Problems solved by technology

However, at present, the data obtained by the dynamic weighing system has not been used to calculate the fatigue life of suspension bridge suspension cables at home and abroad.

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