方形截面高层建筑风致振动特性的数值模拟  

Numerical simulation of wind-induced vibration characteristics of square-section high-rise buildings

作　　者：卢姗姗[1,2] 张志富 陈文礼[1,2] LU Shan-shan;ZHANG Zhi-fu;CHEN Wen-li(Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology,Harbin Institute of Technology,Harbin 150090,China;Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]哈尔滨工业大学土木工程智能防灾减灾工业和信息化部重点实验室,黑龙江哈尔滨150090 [2]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江哈尔滨150090

出　　处：《振动工程学报》2021年第5期911-921,共11页Journal of Vibration Engineering

基　　金：国家自然科学基金青年科学基金资助项目(51808173,51722805);哈尔滨工业大学科研创新基金资助项目(HIT.NSRIF.201862)。

摘　　要：以宽高比1∶6的方形截面高层结构为研究对象,利用计算流体软件FLUENT,基于雷诺应力模型RSM求解不可压缩黏性流体的Navier-Stoke方程,结构的振动响应通过Newmark-β方法(通过用户自定义函数UDF与软件连接)求解,以此来研究该结构的风致振动特性,同时获得刚性静止模型与气动弹性模型在均匀风速流场与不同指数率风剖面下的绕流场规律。数值模拟结果表明:高层建筑结构存在着明显的涡激振动风速锁定现象,振动位移和锁定区宽度与风洞试验结果接近;在风剖面流场作用下,位移响应的变化规律与流场的平均风速有关,当平均风速接近锁定区域时,结构的位移响应最大;随着梯度风速的增加,结构分别呈现1阶和2阶风致涡激振动。高层建筑结构绕流场具有显著的三维特征,沿着高层建筑高度的方向,旋涡发展是不平衡的,越接近结构底部的绕流场,呈非对称性的旋涡脱落,而越靠近顶部的尾流场,呈对称性的旋涡脱落,且其递变的规律与流场速度分布有关。In this study,a square-section high-rise building with width to height ratio of 1∶6 was regarded as the research object.The Navier-Stoke equation of incompressible viscous fluid is solved based on the RSM model by using the computational fluid software FLUENT.The vibration response of the structure was solved by Newmark-βmethod(connected by user-defined function of FLUENT),thus researching the wind-induced vibration of the structure characteristic.Then,the flow field around rigid static model and aeroelastic model was studied.The results showed an obvious phenomenon of displacement’locking in’happened in high-rise buildings,which was in good agreement with the wind tunnel test results.In the velocity profiles,the change rule of displacement response was related to the average wind speed of the flow field.When the average wind speed was close to the locked wind speed,the displacement response of the structure was most obvious.With the increase of the wind speed,the structure presented first and second order wind-induced vibration respectively.The flow field around high-rise structures had obvious three-dimensional characteristics.Along the height of high-rise building,the development of vortex was unbalanced.The closer it was to the bottom,the shedding vortex was asymmetric,and the closer it was to the top,the shedding vortex was symmetric.And its change rule was related to the velocity distribution of the flow field.

关 键 词：高层建筑 涡激振动 流固耦合 数值模拟 绕流场 

分 类 号：TU973.213[建筑科学—结构工程] TU352.1