某高层建筑结构风致扭转响应特性研究  

Research on wind-induced torsional response of a high-rise building structure

作　　者：吴红华[1] 谢尚钊 李正农[1] 胡佳星 沈义俊 WU Honghua;XIE Shangzhao;LI Zhengnong;HU Jiaxing;SHEN Yijun(Key Laboratory of Building Safety and Effciency of Ministry of Education,Hunan University,Changsha 410082,China;College of Civil Engineering and Architecture,Hainan University,Haikou 570228,China)

机构地区：[1]湖南大学建筑安全与节能教育部重点试验室,湖南长沙410082 [2]海南大学土木建筑工程学院,海南海口570228

出　　处：《地震工程与工程振动》2020年第5期61-73,共13页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51678233)。

摘　　要：应用RA013新型扭转角加速度计,实测了海口某高层建筑第8、16、24、32层的扭转角加速度响应。通过对扭转角加速度信号的时域统计分析,发现扭转信号波峰因数与峰度呈正相关的线性关系,在台风作用下扭转向响应不能忽略,且随着平均风速的增大扭转信号趋向于高斯分布。时域上的相关性分析和频谱特性分析表明在台风作用下的扭转振动中一阶振型起绝对主导作用。通过RDT(随机减量法)识别出的一阶扭转振型阻尼比随信号幅值增大而增大,二三阶阻尼比离散性较强未有明显趋势,表明高层结构风致扭转响应主要依靠一阶振型耗散能量。有限元模型前三阶频率与振型和实测信号FDD(频域分解)法识别结果符合良好,随着阶次上升,振型频率差异增大。The torsional angular acceleration signal on 4 floors(Layer 8,16,24,32)of a high-rising building in Haikou was measured by RA013 type angle accelerometer.Time domain statistical parameters of torsional angular acceleration are analyzed,it’s find that the crest factor of the torsional signal has a linear relationship with the kurtosis,the torsional response under the action of the typhoon cannot be ignored,and the torsional signal tends to be gaussian distribution as the average wind speed increases.The correlation analysis in the time domain and power spectral density characteristics analysis show that the first-order mode shape plays an absolute dominant role in the torsional vibration under the action of the typhoon.The first order torsional mode damping ratio identified by RDT(Random Decrement Method)increases with increasing signal amplitude,besides the second and third order damping ratio have large discreteness and there is no obvious trend,those indicate that the wind-induced torsional response of high-rising building mainly depends on the first order mode to dissipate vibration energy.The first three order frequencies and modes of the finite element model agree well with the identified results by FDD(Frequency Domain Decomposition).As the order rises,the mode frequency difference increases.

关 键 词：高层建筑 扭转角加速度响应 波峰因数 阻尼比 有限元模型 

分 类 号：TU973.32[建筑科学—结构工程]