单薄壁空心矩形墩连续刚构桥非线性稳定研究

Study on Nonlinear Stability of Continuous Rigid Frame Bridge with Single Thin Wall Hollow Piers

以一典型单薄壁空心矩形墩连续刚构桥——王家坝大桥施工监控项目为依托,以稳定理论为基础,利用ANSYS软件建立单薄壁空心矩形墩最高墩裸墩施工阶段模型、最大悬臂施工阶段模型和成桥阶段模型,并采用不同类型单元进行模拟,分析对比各施工阶段下的稳定特征值和非线性极限荷载,总结非线性对连续刚构桥稳定的影响规律,可为施工与设计提供参考。

Based on the monitoring of the construction project of a typical continuous rigid frame bridge with single thin wall hollow piers----Wang Jia Ba Bridge and theory of stability, the model of the highest pier of the thin-wall hollow rectangular piers in the construction phase, the model of the largest cantilever bridge in the construction and POSTCS phases are established using ANSYS software and are all simulated by adopting different units. The eigenvalue of stability and nonlinear limit load under various construction stages are analyzed and compared and the influence law of the nonlinear on continuous rigid frame bridge construction process is summarized, which can offer information and reference for the construction and design of the same type of bridge.