下承式桁架拱渡槽的结构可靠度分析

Reliability analysis of structure of open-spandrel truss-arch type prestressed aqueduct

针对南水北调中线工程中较为广泛采用的预应力下承式桁架拱渡槽,采用空间杆系有限元程序与结构响应面法相结合,分析了桁架拱结构在正常设计条件下的可靠度.分析计算表明,该拱结构可靠度已达到了规定的要求,结构是可靠的;结构响应面法也是桁架拱渡槽结构可靠度分析的有效方法.

By combination of the 3-D finite element method with the response surface method, a reliability analysis is made of the structure of the open-spandrel truss-arch type prestressed aqueduct, which has been widely used in the South-to-North Water Transfer Middle Route Project. The result shows that the reliability of the aqueduct structure meets the design requirement, and that the response surface method is an effective method for reliability analysis of the aqueduct structure of the open-spandrel truss-arch type.