某中学框架结构减震优化控制及抗震加固分析

Damping optimal control and seismic strengthening analysis on the frame structure of a middle school

针对位于Ⅳ类土上需要进行抗震加固的某中学框架结构,采用结构减震控制理论,选取非线性黏滞流体阻尼器耗能装置对结构进行减震优化控制,并对安装阻尼器后结构局部构件进行加固。首先基于ETABS软件建立三维弹性模型,对7条地震波输入下减震前后结构的动力响应进行多遇地震下的弹性时程分析,经过优化设计与比选确定黏滞流体阻尼器的参数与个数。同时建立三维弹塑性分析模型进行了弹塑性时程分析,并从力、变形和能量三大指标方面对减震前后的结构在多遇和罕遇地震作用下的地震响应结果进行对比分析。结果表明,采用的优化方法方便快捷,选取的非线性黏滞流体阻尼器减震方案可以提高结构的整体抗震性能,起到了良好的减震效果。

For the frame structure of a middle school where the foundation soil is classified IV, nonlinear viscous dampers were installed and local members were strengthened based on the structural vibration control theory to make a optimal control. Firstly, the 3D elastic model was established by ETABS software, the elastic seismic time history analysis of seven earthquake waves was made with or without the dampers, and the parameters and number of the viscous dampers were determined after optimal design and scheme comparison. Meanwhile, the 3D elastic-plastic model was established and dynamic nonlinear time history analysis was finished. Seismic response under frequent and rare earthquake was analyzed from the aspects of force, deformation and energy dissipation for the structure with and without optimal control. The analysis results show that the optimal design method is convenient and efficient, and it can improve the overall seismic performance of the structure using the nonlinear viscous fluid dampers.