波形钢腹板预应力混凝土连续梁桥参数敏感性分析

Parameters sensitivity analysis of prestressed concrete continuous girder bridge with corrugated steel webs

为研究波形钢腹板预应力混凝土连续梁桥的参数敏感性,以减河大桥为研究对象建立有限元模型,分析主梁质量、混凝土弹性模量、预应力损失及混凝土收缩徐变等参数对主梁结构的影响,从主梁顶板、底板应力变化及竖向挠度变化确定各参数对结构的影响程度,即参数敏感性。结果表明:主梁质量、预应力损失和混凝土收缩徐变对桥梁结构影响较大,混凝土弹性模量对桥梁结构影响较小,边跨合龙处、中跨合龙处和0#块位置受影响程度较大,应加强监控,保证成桥后的结构安全和线形平顺。

In order to study the parameter sensitivity of prestressed concrete continuous girder bridge with corrugated steel webs,the finite element model is established with the Jianhe Bridge as the research object,to analyze the influence degree of different parameters,such as the main girder mass,concrete elastic modulus,prestressed loss and concrete shrinkage,creep on the main girder structure and so on,on the structure.This is called the parameter sensitivity,which is determined from the stress change and the vertical deflection change of the main girder roof and floor.The results show that the main girder mass,prestressed loss and concrete shrinkage and creep have great influence on the bridge structure,and the concrete elastic modulus has little influence on the bridge structure.The closure of side span,the closure of middle span and the position of 0#block are greatly affected.The monitoring should be strengthened to ensure the structural safety and linear smoothness after the completion of the bridge.