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围绕基于Information-Gap(I-G)理论的地下结构稳健性方法展开研究。首先,根据地下结构输出响应模型中不确定参量可能的取值范围及不同波动幅度对结构安全性能的影响,采用I-G模型量化处理不确定参量;其次,通过地下结构失效准则确立输出模型响应值与临界值之间的关系,由此构建稳健函数,并将结构发生失效前能够容许的不确定参量之最大波动幅度值定义为稳健可靠性指标来度量地下结构的可靠程度,从而形成了基于I-G理论的地下结构稳健性分析方法。最后,以某隧道衬砌稳健性分析为例,详细展示了地下结构稳健性分析的具体实施流程。工程算例表明,稳健可靠性指标反映了结构性能主动抵抗不确定性参量变化的能力。稳健性方法为不易得到不确定性因素足够信息的地下结构可靠性分析开辟了一条新途径。
Research around the method of subsurface structural robustness based on Information-Gap (I-G) theory. First, according to the possible range of uncertain parameters in the output response model of underground structure and the influence of different fluctuation range on the structural safety performance, IG model is used to quantify the uncertain parameters. Secondly, the response value of output model The critical value of the structure to build a robust function, and the structure can not be validated before the failure of the maximum uncertainty of the value of the maximum amplitude is defined as a reliable indicator of the reliability of underground structures, thus forming a theory based on IG Underground structure robustness analysis method. Finally, taking the analysis of the robustness of a tunnel lining as an example, the detailed implementation flow of the robustness analysis of the underground structure is demonstrated in detail. Engineering examples show that the robust reliability index reflects the ability of the structural performance to actively resist the variation of uncertain parameters. Robustness methods open up a new avenue for reliability analysis of underground structures that are not readily available with sufficient information on uncertainties.