基于实测加速度的高层建筑风荷载反演

Wind load inversion of highrise building based on measured acceleration

在台风"杜鹃"登陆期间,对温州市某高层建筑进行了现场实测,得到了建筑物的风场和加速度响应等数据。进而对实测结构进行了模态参数识别,得到了其固有频率、振型和阻尼比。对结构加速度响应信号进行了去噪处理,经过信号处理后的响应数据满足高斯分布,进而通过积分得到高层建筑的速度和位移响应。同时,运用等效原理建立了该高层建筑结构的5质点简化弯剪模型,使简化结构的动力特性和原结构相似。再应用简化模型反演出结构受到的脉动风荷载时程。将反演得到的脉动风荷载时程叠加上平均风荷载得到各测点风荷载时程,再作用到简化模型上运用Newmark-β法进行风致响应分析,计算得到的加速度响应与实测加速度响应较为吻合。

During the period in which Typhoon Dujuan landed, a high-rise building in Wenzhou City was employed to undergo field measurement. And the data on wind field and the acceleration response of structure were obtained. Then the modal parameters of the structure were identified to obtain the natural frequency, mode shape and damp- ing ratio. The acceleration responses obey Gaussian distribution after their signals were denoised, and the velocity and displacement responses were acquired by integrating the acceleration response. Meanwhile, the equivalence principle, utilized in establishing the simplified five-mass point bending-shear model of the high-rise building, was engaged to demonstrate that its dynamic characteristics were similar to the original structure. The simplified model was applied again to inverse fluctuating wind load. Then, the fluctuating wind load was superimposed to the average wind load to obtain the total wind load which was loaded on the simplified model. And after analyzing the wind-in- duced response with Newmark-β method, the research shows that the calculated and measured acceleration respon- ses match well.