多元失稳模式下深基坑支护结构的稳定可靠性分析

The Reliability Analysis of Stability of Bracing Structure for Deep Foundation Pit in Multiple Instability Modes

采用结构可靠度理论研究深基坑支护结构的第一类稳定问题,综合考虑工程变量的随机性和不确定性,通过JC法计算实例的稳定可靠指标,由此得出了在多元失稳模式下基坑支护结构失稳的概率界限范围。

The common analysis method to solve the problem of the first sort of stable reliability of bracing structure for deep foundation pit is the fixed quantity method. As the randomness and uncertainty of the engineering variable are not considered, the real stability is not expected from the bracing structure. In this paper, the study on the first sort of stable reliability of bracing structure for deep foundation pit is conducted by means of the structural reliability theory. The engineering variable's randomness and uncertainty is taken into account significantly. By using JC method, the concrete example's stable reliability is calculated and then the bounds of whole failure probability under multiple instability modes are obtained.