考虑多失效模式的桩锚结构鲁棒性设计及经济性优化  

Robust Design of Pile Anchor Structure Considering Economic Optimization and Multiple Failure Modes

作　　者：侯世伟[1] 袁正明 陈昕[1] 曹秀秀 HOU Shiwei;YUAN Zhengming;CHEN Xin;CAO Xiuxiu(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing,China,100124)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第1期123-130,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家重点研发计划项目(2018YFD1100404);辽宁省教育厅基金面上项目(LJKZ0564);北京工业大学教育部重点实验室项目(2022B08)。

摘　　要：目的 研究岩土力学参数的不确定性对桩锚支护体系的整体影响,探究经济性和鲁棒性共同作用的优化设计。方法 选取黄土地区工程案例,考虑支护桩隆起破坏、支护桩倾覆破坏、整体稳定性破坏三类破坏形式,使用蒙特卡洛及点估计法嵌套的方式求出不同设计组合下的失效概率及标准差;同时考虑优化设计的经济性,筛选出桩锚支护结构体系的鲁棒性优化设计方案。结果 随着桩长增加,主控模式由隆起破坏向整体稳定性改变,不同的几何参数对结构鲁棒性影响不同,优化后可以获得同时满足经济性、鲁棒性及可靠度要求的最佳设计方案。结论 在桩锚结构设计中考虑经济性优化及多失效模式的鲁棒性设计是必要的。The overall influence of the uncertainty of geotechnical parameters on the pile-anchor support system is studied to explore the joint role of economy and robustness.The failure probabilities and standard deviations of different design combinations are obtained by Monte Carlo with point estimate method,taking into the three failure forms of uplift failure,overturn failure and overall stability failure.The robustness optimization design of the pile-anchor support system is selected by considering the economy of the optimization design,by selecting engineering cases in loess areas.With the increase of pile length,the main control mode changes from uplift failure to overall stability failure,as the pile length increases,and different geometrical parameters have an impact on the structural robustness,the optimal design solution can be obtained after optimization to meet the requirements of economy,robustness and reliability.It is important to consider economic optimization and robust design for multiple failure modes in the design of pile anchor structures.

关 键 词：桩锚支护 多失效模式 可靠度 鲁棒性 多目标优化 

分 类 号：TU473[建筑科学—结构工程]