基于时变特性的钢板组合梁桥性能退化规律研究

Research on Performance Degradation Law of Steel Plate Composite Beam Bridge Based on Time-variant Characteristics

文章依托安徽省50座典型在役钢板组合梁桥,对钢板组合梁桥运营期的时变性能规律展开研究,分析了钢板组合梁桥体系性能的影响因素;综合考虑材料性能、荷载效应及抗力变化规律,形成了钢板组合梁桥的性能退化模型;建立40 m简支钢板组合梁精细化模型,分析了中载、偏载工况下钢板组合梁桥的时变性能退化规律。研究表明,钢板组合梁体系时变性能退化规律可采用乘幂函数曲线形式表达,其规律主要表现为桥梁运营初期性能退化速率较快并逐渐减缓,桥梁运营后期性能基本不发生退化或退化速率极缓。

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.