基于有限元概率设计的结构敏感性分析研究

基于传统敏感性因子的定义及可靠性向量的概念,提出了两类敏感性概念,定义了因子敏感性矩阵;针对复杂大型结构计算的特点,给出了增量形式的因子敏感性矩阵,并进一步提出了敏感性曲面的概念。ANSYS PDS(ANSYS Probabilistic Design System)技术可以很方便地对上述两类敏感性进行定量分析。算例以一座运营了10年,主跨83.6 m的钢管混凝土拱桥为对象,用ANSYS PDS对其进行了敏感性分析。研究结果表明,文中提出的两类敏感性概念可直观全面的反映各因素对结构可靠性的影响,ANSYS PDS可有效分析结构的两类敏感性问题。

An Analysis of Structure Sensitivity of ANSYS PDS

Based on traditional definition of sensitive factor and concept of reliability vector, two concepts of sensitivity are put forward in this paper. Factor sensitivity matrix is defined. As far as large and complex structures are concerned, factor sensitivity matrix of incremental form is given, and concept of sensitivity surface is put forward. ANSYS PDS（AN- SYS Probabilistic Design System）can conveniently conduct a quantitative analysis of the two sensitivity problems. The example bridge is an CFST arch bridge with 83.6 meter-span, which was operated for 10 years. The results show that the concept of sensitivity can reflect the various influences on reliability of structure. And ANSYS PDS is efficient to analyze the two sensitivity problems.