风荷载下超高层建筑上部结构与桩筏基础共同作用桩顶反力计算研究

Study on Computation of Load on Pile Top with Superstructure-piles-raft-foundation Interaction for Super Tall Buildings under Wind Load

共同作用分析是考虑上部结构与地基基础相互影响的动态调整过程,基于上部结构—桩筏基础-地基土的相互作用进行风荷载下共同作用的流固耦合数值计算。借助流体动力学采用大涡模拟方法,建立考虑风—结构流固耦合数值计算模型,并运用MpCCI软件进行流固耦合面上的数据传递,以实现流体、固体相互作用。计算结果表明,较静载相比,风荷载引起的桩顶反力变化值不超过静载下的5%。计算方法和计算结果可以为风荷载作用下对地基基础的研究和流固耦合问题分析提供参考。

Interaction analysis is a dynamic adjustment process considering the interaction between superstructure and foundation.Based on the interaction between superstructure,pile raft foundation and foundation soil,the fluid-structure numerical calculation is carried out in wind field.Combined with CFD and Large Eddy Simulation,fluid-structure interaction model is established,the data transfer of fluid -structure interactions is carried out by the soft ware MpCCI.The calculated results show that compared with the static load,the change of pile tip reaction caused by wind load is less than 5% of that under the static load.The calculation method and result in this paper could be considered as reference for the study on foundation under wind load and other fluidstructure interaction analysis.