变量相关时悬臂桩支护结构可靠性分析

The Reliability Analysis of Cantilever Retaining Structure with the Correlation between the Considered Variables

运用优化设计理论，提出了变量相关时结构可靠指标的新的计算方法．该方法将结构可靠指标β的计算转化为在等式约束条件（极限状态方程）下求目标函数（可靠指标表达式）的极小值问题，运用牛顿法迭代求解．作为算例，用该方法对在匀质土中的高层建筑深基坑悬臂桩支护结构进行了可靠性分析．

A new method for calculating structural reliability index with the correlation between variables considered is presented based on optimization design theory. Calculating of reliability index (g)is transferred into solving the minimum problem of the target function (the expression of reliability index) under the constraint of limit state equation. Newton iteration is suggested to solve the problem.As an example, reliability of a cantilever retaining structure of a tall building deep pit in even soils isanalyzed.