柱下独立基础稳健性设计与分析  

Robust geotechnical design of spread foundations

作　　者：赵密[1] 张少华[1] 钟紫蓝 侯本伟[1] 杜修力[1] ZHAO Mi;ZHANG Shao-hua;ZHONG Zi-lan;HOU Ben-wei;DU Xiu-li(The Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室

出　　处：《岩土力学》2019年第11期4506-4514,共9页Rock and Soil Mechanics

基　　金：国家自然科学基金项目（No.51421005,No.51738001）~~

摘　　要：岩土工程随机参数统计特征的不确定性,使得岩土工程可靠度设计存在一定风险。岩土工程稳健性设计能够充分考虑随机参数的不确定性结合结构安全性、稳健性和经济性实现最优设计。针对随机参数统计特征的不确定性对柱下独立基础设计的影响,基于可靠度理论和岩土工程稳健性设计方法,考虑岩土参数、混凝土和钢筋材料力学参数统计特征不确定性的影响,以独立基础几何尺寸作为可控设计参数进行设计分析。将独立基础地基承载力、地基变形、基础结构冲切破坏和基础弯曲破坏4种失效模式视为串联系统,进行多失效模式下的结构体系稳健性设计,分析了多失效模式下结构几何参数与结构体系可靠度的关系。结合稳健性和经济性,进行了独立基础多目标优化设计,确定柱下独立基础设计的最优解。The statistical uncertainty characteristics of random parameters in geotechnical engineering makes the reliability design have certain risks. The robust geotechnical design(RGD) method can minimize the effects of variation in the geotechnical parameters on the system response, by explicitly considering robustness in the design process along with safety and economic requirements. Aiming at the influence of the statistical uncertainty characteristics of random parameters on the independent foundation design under the column, the foundation geometry is regarded as controllable design parameters to conducting design analysis. Analysis considers the influence of the statistical uncertainty of the mechanical parameters of rock and soil, concrete and steel material and based on reliability theory and robust design method of geotechnical engineering. In this paper, the robustness design of the structural system under multiple failure modes is carried out, and the relationship between structural geometric parameters and structural system reliability under multiple failure modes is analyzed by viewing four failure modes: independent foundation bearing capacity, foundation deformation, infrastructure punching shear failure and foundation bending failure as series system. Finally, the optimal solution of the design of independent foundation under column is determined combining with robustness and economic efficiency.

关 键 词：独立基础 多失效模式 稳健性设计 可靠度设计 帕累托前沿 

分 类 号：TU431[建筑科学—岩土工程]