城市中心高层双塔建筑风效应及风振响应数值模拟研究  

Numerical simulations of wind effects and wind-induced responses on twin tall buildings in an urban area

作　　者：闫渤文 李大隆 鄢乔 汪之松[1] 周绪红[1] YAN Bowen;LI Dalong;YAN Qiao;WANG Zhisong;ZHOU Xuhong(Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学山地城镇建设与新技术教育部重点实验室土木工程学院,重庆400045

出　　处：《振动与冲击》2020年第20期223-231,250,共10页Journal of Vibration and Shock

基　　金：中央高校基本科研业务费(106112017CDJXSYY002,2020CDJQY-A062);国家自然科学基金(51878104);中国博士后科学基金(2018M631063)。

摘　　要：基于计算流体动力学方法(Computational Fluid Dynamics,CFD)与有限元方法(Finite Element Method,FEM),对城市区域的高层双塔建筑风荷载以及风振响应问题开展了系统的研究。提出了基于刚度映射算法的CFD/FEM单向耦合的高层建筑风效应及舒适度评估分析框架;采用该分析框架研究了位于城市中心的高层双塔建筑围护结构风荷载及主体结构风振响应,并结合高层建筑结构规范对其位移幅值及风振舒适度进行了合理评估。结果表明:基于数值模拟的分析框架不仅能够准确地考虑真实的城市地貌,并且可以高效地开展具有复杂外形的高层建筑风荷载取值、风振响应计算以及舒适度评估分析;考虑气动干扰效应的某城市中心高层双塔建筑的风振位移响应幅值及风振舒适度评估结果满足相关规范的要求;由于考虑真实城市地貌、结构复杂气动外形以及气动干扰等因素,该数值模拟结果与我国荷载规范规定的风振系数相比偏小。因此,提出的CFD/FEM单向耦合数值模拟方法能够高效地开展高层建筑结构的抗风设计,并获得经济合理的分析结果。Based on Computational Fluid Dynamics(CFD)and the Finite Element Method(FEM),this study investigates wind effects on and wind-induced vibration of twin tall buildings in an urban area.Firstly,this study proposes a complete analysis framework of wind effects on and wind-induced response of tall buildings using one-way coupled CFD/FEM based on the stiffness mapping algorithm.And then,considering realistically urban terrain conditions,the wind loads on the building envelope and wind-induced responses of twin tall buildings were obtained and the habitant comfort was assessed according to the Chinese wind code using the proposed framework.The results show that the proposed framework can provide a cost-effective way for wind load estimation on and wind-induced response predictions of tall buildings as well as occupant comfort assessment.It was found that wind-induced displacement and vibration of the twin tall buildings could satisfy relevant specifications in the Chinese codes and standards.Furthermore,the gust loading factors of the twin tall buildings obtained from the numerical simulations are smaller than those specified in the Chinese wind code.Due to the realistic urban terrains,complex building shape and aerodynamic interference were considered in the numerical simulations.The proposed one-way coupled CFD/FEM approach enables engineers and researchers involved in the wind-resistant design of tall buildings to obtain economic and reasonable results for practical practices.

关 键 词：高层双塔建筑 城市区域 CFD/FEM单向耦合 风效应 风振响应 

分 类 号：TU17[建筑科学—建筑理论] TU972.9