摘要
在同济大学TJ-2风洞中对某超高层建筑进行了刚性模型分组同步测压风洞试验,获得了各测点层的风力时程,然后运用双模态转换法(DMT)—即联合运用经典模态分析法(CMA)和本征正交分解法(POD)来进行风振响应计算,研究风荷载对响应的影响因素。计算结果表明:风振响应的结果与荷载-振型影响系数有关,当某阶荷载模态与振型模态正交性较强时,该阶荷载对响应的贡献较小,反之亦然;同时,风振响应的结果还与荷载模态主坐标的能量大小(本征值)及频谱特性、结构频率和阻尼比有关,本征值越大,其对风振响应的贡献越大,在阻尼比为定值时,某阶频率处的功率谱值越大则其对风振响应的共振分量贡献也会越大。
The rigid model synchronization pressure test of one super-tall building is carried out in T J-2 Wind Tunnel and the time-history of wind pressure is gained. Then the Double Modal Transformation Method （DMT）, including Classical Modal Analysis and the Proper Orthogonal Decomposition, is used for calculating wind-induced responses. The results show that： the results of wind-induced responses are related to the load-mode influence coefficient. With high orthogonality between one load mode and an inherent mode, the contribution of one load mode is small, and the contrary case is the same. At the same time, the results of wind-induced responses are related to the energy of main coordinates of load modes （proper value）, spectrum properties, structural frequency and damping, and the contribution of proper value on wind-induced responses will be greater as its value is greater. When the damping is a fixed value, the contribution on the resonance component of wind-induced responses will be greater with spectrum of one frequency greater.
出处
《工程力学》
EI
CSCD
北大核心
2009年第9期117-125,共9页
Engineering Mechanics
基金
上海市教育委员会曙光计划项目(04SG23)
上海市科学技术委员会交叉领域创新团队培养计划项目(03DZ12039)
关键词
超高层建筑
双模态转换
经典模态分析
本征正交分解
刚性模型同步测压试验
super-tall building
double modal transformation
classical modal analysis
proper orthogonal decomposition
rigid model synchronization pressure test
