超高层建筑上部结构—群桩—筏板—土共同作用下筏板性状风振响应计算与分析

Calculation and analysis of super structure-piles-raft-soil interaction for raft bearing behavior of super tall buildings

风荷载是控制超高层建筑结构设计的主要因素。借助流体动力学采用大涡模拟方法,通过FLUENT和ABAQUS软件建立考虑风场和结构的流固耦合分析模型,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。以国际上通用的风工程CAARC标准模型为对象,进行了考虑刚性基础和上部结构—群桩—筏板—土共同作用的风—结构流固耦合数值模拟计算和分析。结果表明:(1)本文方法计算结果与解析解基本一致,与前人的风洞试验和数值模拟结果基本一致;(2)流固耦合分析下,地下室侧面土体可抵抗一半以上风荷载在筏板处引起的附加弯矩,风荷载引起的筏板平均附加弯矩远小于自重产生的弯矩。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。

Wind load is the main factor controlling the structural design of super tall buildings.Combined with CFD and Large Eddy Simulation,fluid-structure interaction model is established in wind field by software FLUENT and ABAQUS,the data transfer of fluid-structure interactions is carried out by the software MpCCI.On the basis of international commonly used wind engineering model-CAARC standard architectural model,the three-dimensional numerical simulation of fluid-structure interaction of wind and structure are established and analyzed considering rigid foundation and super structure-piles-raft-soil as object research respectively.The results show that:(1)The calculated results of the method in this paper are basically consistent with the analytical solution,and with the results of wind tunnel test and numerical simulation carried by predecessors.(2)Through the fluid-solid coupling analysis,the soil mass at the side of the basement can resist more than half of the additional bending moment which caused by wind load on the raft,and the average additional bending moment of the raft caused by wind load is far less than that generated by gravity stress.The calculation methods and results can be considered as reference for the study on foundation under wind load and other fluid structure interaction analysis.