预应力损失对多跨连续刚构桥结构性能的影响分析

针对多跨预应力连续刚构桥存在预应力损失的现象，采用Midas／Civil软件对依托工程桥梁结构的不同工况进行建模分析，并分别进行各工况下结构弯矩值和跨中挠度的对比分析。分析结果表明：由于实际成桥状态预应力损失值大于原计算值，桥梁结构合龙段控制节点弯矩值和挠度均大幅度上升，这都对桥梁结构受力产生非常不利的影响并直接导致桥梁后期使用中出现诸多病害。

Influence of Loss of Prestress on Structural Performance of Multi-Span Continuous Rigid Frame Bridge

Based on the loss of prestress of multi-span concrete continuous rigid frame bridge, the perfor- mance of one bridge structure is studied using Midas/Civil software to set models respectively under vari- ous operating conditions, and the value of structure moment and midspan deflection is contrast analyzed. The results show that the actual loss of prestress is greater than the calculated value, and the bending mo- ment and deflection of control node at the bridge structure closed period. It will have a detrimental effect on the bridge structure stress,and even lead to serious diseases in later use.