基于桩土共同作用下的两桩承台数值分析

Numerical analysis of two pile caps under the combined action of pile and soil

利用大型有限元分析软件建立了桩土两桩承台的非线性计算模型,对其受力性能进行了分析。首先利用试验数据,验证了有限元模型的可靠性;其次分析比较了不同距厚比的两桩承台在共同作用下承受荷载时的力流分布和受力特征,对比了承台内钢筋的应力及发展趋势;最后探讨了承台在共同作用下的受力机理,为两桩承台的设计优化提供了参考。对于距厚比w/h0≤1的两桩承台建议可采用空间桁架模型计算,而距厚比w/h0>1的两桩承台则可采用深受弯的梁式体系进行计算。

Using large-scale finite element analysis software to establish the pile-soil-two pile caps of the nonlinear finite element calculation model,and analyze its mechanical properties.Firstly,the reliability of the finite element model is verified by using the experimental data.Secondly,analyzing and comparing the different from the ratio of distance and thickness of two pile caps under the effect of interaction bearing force of flow distribution and stress characteristics,comparing the stress and its development trend of steel in caps.Finally,discussing the mechanical mechanism of the pile caps under the effect of interaction,to provide the reference for the optimization design of the two pile caps.For the two pile caps whose ratio of distance and thickness are thicker than one are recommended to use the space truss model to calculate,and the two pile caps whose ratio of distance and thickness greater than one can be calculated by the deep beam system.