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针对某4层RC框架结构部分节点核心区剪力设计值与层间位移角不满足规范要求的问题,引入消能减震技术对结构进行减震控制。首先,采用随机平均法对非线性粘滞阻尼器进行等效线性化,进一步基于YJK和ETABS软件平台采用振型分解反应谱法和时程分析法对等效线性化前后的结构模型进行分析,研究了结构节点内力、层间位移角和楼层剪力的变化情况。结果表明:结构增设粘滞阻尼器后,能有效减小结构节点内力、层间位移角和楼层剪力,使其在地震作用下满足规范要求,结构整体抗震性能得到有效改善;随机平均法可用于非线性粘滞阻尼器的等效线性化,等效线性化前后结构节点内力相差很小。
Aiming at the problem that the design value of shear force and the displacement angle in the core of some four-story RC frame structure do not meet the requirements of the code, vibration damping technology is introduced to reduce the vibration of the structure. Firstly, the stochastic average method is used to linearize the nonlinear viscous dampers. Based on the YJK and ETABS software platforms, the modal decomposition response spectrum and time history analysis are used to analyze the structural models before and after equivalent linearization. The changes of internal force, displacement angle and floor shear of structural joints are studied. The results show that the addition of viscous dampers to the structure can effectively reduce the internal forces, the displacement angles and the floor shear forces of the structural joints so that they can meet the requirements of the code under seismic action and the overall seismic performance of structures can be effectively improved. The stochastic averaging method is available For the equivalent linearization of nonlinear viscous dampers, the internal forces of structural nodes before and after equivalent linearization show a small difference.