地震作用下钢框架高层结构的抗震性能研究

钢框架高层建筑结构是当前高层建筑设计中使用最为广泛的技术,为提升其抗震性能,本文研究将调谐质量阻尼器安装在钢框架高层建筑结构顶部,考虑到建筑空间需求、防止集中荷载和提升控制效果等因素,在相同楼层或同顶部接近楼层中设置数个较小的、频率一致的子控制装置,通过设置调谐质量阻尼器受控结构等效阻尼比求极值的方法,获取最优刚度与最优阻尼系数;将获取的结果在有限元软件中进行模态分析获取模态质量,实现钢框架高层建筑结构扭转振动的减振控制。实验结果表明,地震荷载下,该方法使得建筑结构顶层角位移峰值和角加速度峰值分别降低50%和30%左右,建筑结构响应下降19%～26%,提高了高层建筑结构的稳定性。

Seismic Performance of High-rise Steel-frame Structures under Seismic Action

Today, high-rise steel-frame structures are widely used in high-rise building design. To improve the seismic performance of high-rise steel-frame buildings under earthquake action, we installed a tuned mass damper on the top of a high-rise steel-frame building structure. By considering several factors, i.e., the building space requirements, the prevention of concentrated load, and the improvement of control, we obtained the optimal stiffness and damping coefficient by setting the tuned mass damper to obtain the extreme equivalent damping ratio of the controlled structure. Then, we determined the modal mass by modal analysis of the obtained results using finite element software and achieved reduction control of the torsional vibration of the high-rise steel-frame building. The experimental results show that by using the proposed method, the peak values of angular displacement and acceleration at the top floor of building structures can be reduced by 50% and 30%, respectively, and the response of the building structure can be decreased by 19-26%, which indicates that this method can improve the stability of the high-rise building structures.