山地风场中圆形截面超高层建筑风荷载谱  

Analysis of wind load spectrum of super tall buildings with round section in hilly terrain wind field

作　　者：孙毅[1] 李正良[1] 黄汉杰[2] 陈朝晖[1] 魏奇科[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]中国空气动力研究与发展中心低速空气动力研究所,四川绵阳621000

出　　处：《重庆大学学报（自然科学版）》2011年第8期24-30,共7页Journal of Chongqing University

基　　金：国家自然科学基金重大研究计划(90715024);重庆大学研究生创新团队建设项目(200909C1017)

摘　　要：为了研究山地风场中超高层建筑的风荷载和风振响应特性,必须了解复杂湍流变化对建筑风荷载的影响。在风洞中模拟了4种湍流度,通过3个不同高宽比圆形截面超高层建筑模型,考察了来流湍流度、建筑高宽比、层高度等因素对顺风向和横风向风荷载功率谱影响规律。针对2个方向风荷载功率谱的特点分别采用不同荷载谱模型进行了参数拟合,再以湍流度、建筑高宽比为基本变量对荷载谱模型参数进行二次拟合,初步建立了复杂山地圆形截面超高层建筑风荷载功率谱的数学模型。最后给出一个实例,通过具体山地风速和湍流度剖面,根据提出的建筑风荷载功率谱数学模型,比较了山地和平地圆形截面超高层建筑的风振响应。In order to get wind load and wind induced response of super tall buildings in hilly terrain wind field,effect of changing of turbulent intensity on wind loads must be known.4 kinds of turbulent wind field are simulated,and 3 super tall building models with round section of different aspect ratio are manufactured.Effects of turbulent intensity,aspect ratio and layer height on along-wind and across-wind load are discussed.Different models are used in fitting of wind load spectrum on each direction.Parameters of load spectrum models are secondary fitted based on turbulent intensity and aspect ratio.Mathematical models of wind load spectrum of super tall buildings with round section in hilly terrain are preliminarily established.At last,an example is provided.According to vertical profile of mean velocity,turbulent intensity and mathematical model of wind load spectrum,wind induced dynamic response of super tall buildings in hilly terrain and flat terrain are compared.

关 键 词：山地风场 圆形截面 超高层建筑 风荷载 风洞试验 数学模型 风振响应 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程] TU312[建筑科学—结构工程]