基于实测位移的大跨度PC连续刚构桥结构有限元模型修正方法研究

Research on the Correction Method of Finite Element Model for Long-span PC Continuous Rigid-frame Bridge Structure Based on Measured Displacement

基于大跨度PC连续刚构桥跨中挠、梁底及腹板开裂等病害特点,该文以体外预应力加固某大跨度PC连续刚构桥为依托工程,提出了以中跨跨中下挠值及拉应力为控制目标的结构损伤模型修正方法,同时,根据监测结果与初始加固模型理论之间的差异,论证了该方法的准确性、快速性、实用性,可为桥梁健康评估、加固及新建工程设计提供参考。

Given the defects of long-span PC continuous rigid frame bridges such as mid-span deflection, beam bottom and web cracking, etc., this paper, based on a long-span PC continuous rigid-frame bridge reinforced by external prestressing,proposed a structural damage model correction method which takes the mid-span deflection value and tensile stress as the control targets. Meanwhile, according to the difference between the monitoring results and the initial reinforcement model theory, this paper verified the accuracy, rapidity and practicability of the method, which can provide some reference for bridge health assessment, reinforcement and newly-built construction design.