基于响应面法和重要性抽样的杆塔掏挖基础抗拔可靠性分析  

Uplift Bearing Reliability of Excavated Foundation Based on Response Surface Methodology and Importance Sampling

作　　者：周佳成 丁士君 李镜培[1] 杨文智 ZHOU Jiacheng;DING Shijun;LI Jingpei;YANG Wenzhi(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;China Electric Power Research Institute,Beijing 100055,China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]北京工业大学建筑工程学院,北京100124 [3]中国电力科学研究院有限公司,北京100055

出　　处：《结构工程师》2020年第3期175-183,共9页Structural Engineers

基　　金：国家自然科学基金项目(41772290)。

摘　　要：基于复合中心抽样的二次响应面法(RSM)和中心正态抽样的重要性抽样法(IS)的基本原理,建立了杆塔掏挖基础抗拔承载力可靠度的计算方法和求解的基本步骤,并编制了相应的MATLAB程序.通过算例对比,验证了二次响应面法的合理性.基于响应面法,进一步研究了基本变量的变异性、荷载效应比以及安全系数对可靠度指标的影响.研究结果可为相关规范的修订提供参考.Based on the basic principle of the composite center sampling quadratic response surface method(RSM)and the central normal sampling importance sampling method(IS),the calculation steps of the uplift bearing reliability of the excavated foundation are established.Besides,the corresponding MATLAB program is compiled;The comparison of the example proves the rationality of the quadratic response surface method.Based on the response surface method,influence of the variability,the load effect ratio,and the safety factor of basic variables on the reliability index is further studied.The conclusions of this paper provide references for the revision of relevant standards.

关 键 词：掏挖基础 可靠度指标 随机场模型 响应面法 重要性抽样 

分 类 号：TU753[建筑科学—建筑技术科学]