Research on Performance Degradation Law of Steel Plate Composite Beam Bridge Based on Time-variant Characteristics
Based on 50 typical in-service steel plate composite beam bridges in Anhui Province,this paper studies the time-variant performance law of steel plate composite beam bridges during operation,and analyzes the influencing factors of the performance of steel plate composite beam bridge system.Considering material performance,load effect and resistance variation law comprehensively,the performance degradation model of steel plate composite beam bridge is formed.A refined model of 40 m simply supported steel plate composite beam is established,and the time-variant performance degradation law of steel plate composite beam bridge under medium load and eccentric load conditions is analyzed.The research shows that the time-variant performance degradation law of the steel plate composite beam system can be expressed in the form of a power function curve,which is mainly manifested that the performance degradation rate of the bridge in the early stage of operation is fast and gradually slows down,and the performance of the bridge in the later stage of operation is basically not degraded or the degradation rate is extremely slow.
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