考虑多失效模式的桩-土结构体系稳健性设计

doi:10.16265/j.cnki.issn1003-3033.2020.06.004

中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (6): 23-30.doi: 10.16265/j.cnki.issn1003-3033.2020.06.004

考虑多失效模式的桩-土结构体系稳健性设计

杜修力教授, 曹秀秀, 钟紫蓝副研究员, 侯本伟讲师, 王威副教授

北京工业大学建筑工程学院,北京 100124

收稿日期:2020-03-24 修回日期:2020-05-11 出版日期:2020-06-28 发布日期:2021-01-28
作者简介:杜修力(1962—),男,四川广安人,博士,教授,主要从事工程结构抗震及安全评价等方面的研究。E-mail:duxiuli@bjut.edu。
基金资助:
国家重点研发计划项目(2018YFC1504305);广东省地震工程与应用技术重点实验室开放基金资助(2017B030314068);北京市科技计划课题(Z181100009018001)。

Robust geotechnical design of soil-pile foundation system considering multiple failure modes

DU Xiuli, CAO Xiuxiu, ZHONG Zilan, HOU Benwei, WANG Wei

College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

Received:2020-03-24 Revised:2020-05-11 Online:2020-06-28 Published:2021-01-28

摘要/Abstract

摘要： 针对桩基础设计中岩土参数和荷载的不确定性,首先,提出考虑多失效模式的桩-土结构体系的稳健性设计(RGD)方法,综合分析单桩竖向承载能力极限状态(ULS)、竖向正常使用极限状态(SLS)、水平强度失效和水平变形失效4种失效模式;其次,采用蒙特卡罗模拟(MCS)法和点估计法(PEM)嵌套的方法计算桩-土结构体系的失效概率均值和标准差,以失效概率标准差作为衡量结构稳健性的指标;最后,以稳健性和经济成本作为优化目标,确定单桩的最优设计。结果表明:多失效模式下,不同的单桩设计尺寸,起决定作用的失效模式不同;随着单桩设计几何尺寸的增加,桩-土结构体系的主控失效模式逐渐由桩水平强度控制转为由竖向正常使用极限状态控制;主控失效模式的变化,对结构体系的失效概率变化梯度影响较大。

关键词: 桩-土结构体系, 多失效模式, 可靠度分析, 稳健性设计(RGD), 多目标优化

Abstract: In order to address uncertainties of geotechnical parameters and loads in pile foundation design, firstly, a RGD method considering multiple failure modes was proposed. Four typical failure modes, vertical ultimate limit state (ULS), vertical serviceability limit state (SLS), horizontal strength failure and horizontal deformation failure were analyzed. Then, Monte Carlo simulation (MCS) and point estimate method (PEM) nesting were adopted to compute mean value and standard deviation of failure probability for soil-pile foundation system, and the latter was used as an indicator to measure robustness. Finally, optimal design of soil-pile foundation system was finalized with robustness and cost as objectives. The results show that piles with different geometries have different dominant failure modes. With the increase of geometries, key failure mode changes from horizontal strength failure to vertical SLS, which has significant influence on gradient of of system' failure probability.

Key words: soil-pile foundation system, multiple failure mode, reliability analysis, robust geotechnical design(RGD), multi-objective optimization

中图分类号:

X948

杜修力, 曹秀秀, 钟紫蓝, 侯本伟, 王威. 考虑多失效模式的桩-土结构体系稳健性设计[J]. 中国安全科学学报, 2020, 30(6): 23-30.

DU Xiuli, CAO Xiuxiu, ZHONG Zilan, HOU Benwei, WANG Wei. Robust geotechnical design of soil-pile foundation system considering multiple failure modes[J]. China Safety Science Journal, 2020, 30(6): 23-30.

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考虑多失效模式的桩-土结构体系稳健性设计

Robust geotechnical design of soil-pile foundation system considering multiple failure modes

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