耗能减震技术在钢结构建筑性能提升中的应用
2021-08-24孙道乾
孙道乾
摘 要:本文通过对某钢结构进行减震加固分析,讨论了基于防屈曲钢板剪力墙和黏滞阻尼器两种减震方案在多遇、罕遇地震影响下的性能对比。在多遇地震下,两方案的层间位移角相比原结构都有所减小;在罕遇地震情况下,两种布置方案都有效耗散了地震能量,提高了结构的安全性。对比发现,黏滞阻尼器滞回曲线更加饱满,消耗地震能量较多,两方案布置均满足规范要求。
关键词:钢结构;性能对比;滞回曲线
中图分类号:TU352文献标识码:A文章编号:1003-5168(2021)10-0086-03
Study on the Application of Energy Dissipation Damping Technology in the Performance Improvement of Steel Structure Building
SUN Daoqian
(School of Civil Engineering and Communication, North China University of Water Resources and Electric Power,Zhengzhou Henan 450045)
Abstract: Based on the analysis of a steel structure, this paper discussed the performance comparison of two damping schemed based on buckling restrained steel plate shear wall and viscous damper under the influence of frequent and rare earthquakes. In the case of frequent earthquakes, the story drift angle of the two schemes was smaller than that of the original structure; In case of rare earthquake, the two layout schemes could effectively dissipate the seismic energy and improve the safety of the structure. It was found that the hysteretic curve of viscous damper was fuller and consumes more seismic energy. Both schemes met the requirements of the code.
Keywords: steel structure;performance comparison;hysteresis curve
耗能减震主要是通过在结构体系内部设置耗能构件或阻尼元件,以增大阻尼,得到一个周期长于原有自振周期和场地卓越周期的结构,通过耗能(阻尼)装置产生摩擦、弯曲(或剪切、扭转)弹塑性滞回变形来耗散或吸收地震输入结构的能量,以减少主体结构的地震反应。防屈曲钢板剪力墙作为位移型阻尼器,在中震或大震下具有良好的滞回耗能能力。本文采用防屈曲钢板剪力墙与黏滞阻尼器作为耗能构件,研究其在既有建筑结构减震方面的应用。
1 耗能减震原理及防屈曲钢板剪力墙
1.1 耗能减震原理
基于能量转换角度阐述减震控制下能量平衡方程[1],耗能减震结构平衡方程为:
[EQ=EV+ES+EC+ED] (1)
式中:[EQ]为结构体系输入全部的地震能;[EV]为地震过程输入的动能与势能之和;[ES]为结构体系弹塑性变形所消耗应变能;[EC]为主体结构阻尼耗能;[ED]为耗能装置吸收耗散的能量。
与传统抗震结构相比,在输入地震能总量维持不变的情况下,耗能构件可以在结构体系进入非弹性工作前开始耗能,效果明显。……
