大跨V形刚构桥标高控制动态可靠性及灵敏度研究

Research on Dynamic Reliability and Reliability Sensitivity of Elevation Control for Long Span V-shaped Rigid Frame Bridge

提出基于响应面法进行大跨V形刚构桥标高控制动态可靠性及灵敏度分析的方法,该方法包括试验设计、有限元分析、响应面函数拟合、标高控制动态可靠性评估和灵敏度分析.以镇大公路运河大桥为例,在考虑有关参数变异的情况下,对施工过程中的标高控制动态可靠性及可靠性灵敏度进行评估,定量分析了各结构参数对标高控制动态可靠性的影响.研究结果表明:大跨混凝土V形刚构桥施工监控过程中随着悬臂长度的增加,标高控制动态可靠性和可靠性敏感性绝对值变化较大,应根据动态可靠性分析结果确定施工过程中的挠度变化允许最大误差.

The method of evaluating the dynamic reliability and reliability sensitivity of large-span V-shaped rigid frame bridge was put forward based on the response surface during construction monitoring. The process of method included experimental design, finite element analysis, fitting the response surface function, evaluating the dynamic reliability and analyzing reliability sensitivity. Taking practical engineering for example, the dynamic reliability and reliability sensitivity during construction process were evaluated, and the dynamic reliability sensitivities of structural parameters affecting elevation control were analyzed quantitatively. The results showed that the dynamic reliability and the absolute value of reliability sensitivity varied greatly with the increase of cantilever length during construction for long span V-shaped concrete rigid-frame bridge, and the allowable construction error should be determined according to dynamic reliability data.