基于实测数据的大跨径连续刚构桥异常变形敏感性分析

Sensitivity analysis on the deformation parameter of large-span continuous rigid frame bridge based on measured data

以重庆交通科技项目的"重庆市江津长江大桥监测实用技术研究"为依托,对类似的大跨度连续刚构桥异常下挠问题的敏感因素进行了识别分析,并找出主要的影响因素。分析结果表明,有效预应力降低是造成大跨径连续刚构桥跨中下挠异常的主要原因,同时温度变化对挠度的影响也不可忽视。

Based on the Chongqing traffic science and technology project＂research of practical monitoring technology for Chongqing Jiangjin Yangtze River Bridge＂,sensitive factors of large-span continuous rigid frame bridge deflection are identified and analyzed,and the major influence factors are determined. The results show that loss of prestress and concrete shrinkage and creep are the major factors which lead to the deflection in the midspan of continuous rigid frame bridges. Meanwhile,the effect of temperature cannot be ignorable.