等效线性化方法在RC框架结构设计中的应用

为研究罕遇地震作用下等效线性化方法在RC框架结构设计中的应用，基于现有的结构非线性响应的等效线性化方法，通过与RC框架结构非线性时程分析结果对比，分析不同的等效线性化方法计算罕遇地震作用下结构地震响应的有效性，并确定等效线性化参数的取值；按基于等效线性化的设计方法及现行规范方法分别设计了分析算例，通过非线性动力时程分析，对比了框架结构实现预期强震破坏模式的效果。结果表明：同时考虑刚度折减和附加阻尼的割线刚度等效线性法可更好模拟结构强震非线性反应；基于等效线性化的设计方法可更好地实现结构在罕遇地震作用下的预期破坏模式。

Application of equivalent linearization method indesign of RC frame structure

The design method directly based on the internal force under rare earthquake by using equivalent linearization method was studied to realize the design of RC frame structure. First, this paper summarizes existing equivalent linearization methods. Then, through comparing the linear response of the reinforced concrete frame structures obtained by equivalent linearization method with the nonlinear response obtained by nonlinear time history analysis, the effectiveness of different equivalent linearization methods was verified, and the value of equivalent linearization parameters was proposed. Finally, RC frame structures with different heights were designed using equivalent linearization method in accordance with the Chinese seismic code. The nonlinear dynamic time history analysis was performed to investigate the effectiveness of the proposed method in achieving the expected earthquake failure mode. The result indicates that the structural response under rare earthquake could be better simulated by the secand stiffness method in which stiffness reduction and additional damping ratio are considered at the same time. It is a better way to guide the RC frame structure to the preset failure mode using the internal force under rare earthquake obtained by equivalent linearization method.