Abstract
AbstractFatigue behavior of a bridge is considered as a main concern for structural engineers especially for bridge construction due to the rapid growth of overloaded trucks. Truck traffic has increased significantly on bridge structures in Bangkok. Moving loads due to overloaded trucks on a steel girder bridge would cause fracture formation and propagation. The study is conducted to assess the safety of a steel girder bridge under actual truck traffic data. The study addresses the fatigue behavior of the bridge structure using FEM analysis. This will help to evaluate the remaining service life under the operational performance of several truck classes. The service life of this steel girder bridge can be evaluated by S-N curve application based on Miner’s damage rule which is recommended by AASHTO LRFD standard specifications. The bridge consists of 19 spans with 1.75 m transverse width of each five longitudinal steel girders including reinforced concrete slabs. The dynamic behavior of the steel girders was validated by field instrumentation. The fatigue truck model was constructed using data of 102,546 truck movements in 2020. The data included gross weight, axle weight, and axle spacing. The number of stress cycles can be measured by analytical investigation at the midspan of each girder. The result obtained from analytical investigation revealed that the steel girder bridge would be affected fatigue failure with the expected growth of truck traffic and the classified fatigue trucks based on the actual truck data.KeywordsSteel girder bridgeOverloaded truckFatigue behaviorService lifeFEM
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