【摘要】 基于ABAQUS有限元软件模拟分析,通过模拟土的动力本构模型,选取合理的人工边界,建立了2种刚性桩复合地基与上部结构相互作用体系有限元动力分析模型,采用时程分析法对刚性桩复合地基调平前后进行地震响应分析。结果表明,调平后刚性桩复合地基对相互作用体系中上部结构的动力反应明显要比调平前时动力反应小;调平后的筏板基础在地震荷载载作用下,筏板较调平前的弯矩更小,差异沉降也更小;调平后刚性桩复合地基中,在地震荷载下长桩的最大弯矩和水平位移远大于短桩,长桩在变刚度处弯矩较大,容易发生断桩。通过对比指出,调平后刚性桩复合地基在同等经济条件下抗震性能优于调平前。更多还原

【Abstract】 Based on ABAQUS finite element analysis software simulation,two kinds of finite element models for dynamic analysis of rigid pile composite foundation and superstructure interaction system is established by simulating the soil dynamic constitutive model and selecting appropriate artificial boundary. The influence of rigid pile composite foundation on balance and imbalance of varying rigidity is analyzed under seismic loads. The result shows that: dynamic response of rigid pile composite foundation on balance varying rigidity on the upper structure is significantly smaller than that of on imbalance of varying rigidity on the upper structure; raft bending moment and differetial settlement of rigid pile composite foundation on balance varying rigidity is smaller under seismic load; the maximum bending moment and the horizontal displacement of the long pile is much greater than that of the short pile under seismic loads,the long pile of bending moment is larger in the position of stiffness change. By constrast,under the same economic condition,the aseismic performance of of rigid pile composite foundation on balance of varying rigidity is better than that of rigid pile composite foundation on imbalance of varying rigidity.更多还原