摘要
循环加载模式下吸力式沉箱基础的拉拔承载性能目前尚缺乏合理的分析与计算方法.应用Andersen等对重力式基础及地基所建议的分析方法,将软土的循环强度与Mises屈服准则相结合,针对吸力式沉箱基础,采用大型通用有限元分析软件ABAQUS进行了三维拟静力有限元分析,确定了循环加载模式下吸力式沉箱的循环承载力及其破坏包络面,并与单调加载作用下沉箱基础的极限承载力及其破坏包络面进行了对比.结果表明,与单调加载情况相比,循环加载作用下吸力式沉箱基础的拉拔承载能力显著降低,而沉箱长径比对基础循环承载力降低效应的影响不大.
To rationally evaluate the uplift bearing capacity behavior of suction caisson foundation under cyclic loading pattern, a 3D quasi-static numerical procedure based on FEM for evaluating the uplift bearing capacity behavior of suction caisson foundation is developed. Based on the framework of the general-purpose finite element analysis software ABAQUS, applying Andersen＇s analytical method about gravity foundation and combining cycle strength of soft soil and Mises yield criterion, the cyclic bearing capacity and collapse envelope of suction caisson foundation under cyclic loading pattern are determined. Then comparative numerical computations are performed for different aspect ratios of caisson foundation under monotonically combined loading pattern and cyclic combined loading pattern. The experimental results indicate that the uplift bearing capacity behavior of suction caisson foundation under cyclic loading pattern is significantly reduced compared with that under monotonically loading pattern, and the aspect ratio of caisson has little influence on the reduced effect of cyclic bearing capacity.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2009年第3期414-418,共5页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(50579006,50639010)
关键词
吸力式沉箱基础
有限元分析
循环承载力
拟静力分析
破坏包络面
suction caisson foundation
finite element analysis
cyclic bearing capacity
quasi-staticanalysis
collapse envelope
