极值型风荷载作用下大型结构可靠性分析

System Reliability Analysis of Large Structure under Gumbel Distribution Wind Loads

研究了在极值型风荷载作用下大型结构的可靠性。结构的破坏以结构刚度矩阵奇异为依据，首先列举结构的主要破坏模式，其次利用增量载荷法求出的结构的安全余量方程，然后将极值型风荷载正态化，计算出各主要破坏模式的破坏概率，并用二阶窄界限理论计算大型结构的可靠性。

The purpose of this paper is to investigate the system reliability of large structure under Gumbel distribution wind loads. The singularity of the total structural stiffness matrix is checked as a failure criterion. By searching the dominant fail modes and applying the incremental load method, the equation of safety margins can be determined, then normalizing Gumber wind loads, failure probability for those failure modes are evaluated. Using Ditlevsen bound theory, the system reliability of large structure is obtained. At last a large transmission tower is demonstrated as an numerical example.