特征延性系数谱及RC框架的目标位移

Characteristic Ductility Ratio Spectrum and Target Displacement of RC Frames

通过大量计算分析 ,探讨了地震作用下弹塑性单自由度体系位移延性系数 μΔ 与特征强度比cy,屈服位移Δy 之间的关系 ,建立了单自由度体系的 μΔ cy Δy 曲线 ,即特征延性系数谱。提出了两种确定钢筋混凝土框架的屈服基底剪力和屈服顶点位移方法。探讨了通过多 单自由度体系转移 ,利用特征延性系数谱和结构的弹性参数求解规则均匀框架弹塑性目标位移的方法。还给出了一个 1 2层规则RC框架目标位移计算的算例。

By large amount of calculation,the relations among the displacement ductility ratio μ Δ,the yield displacement Δ y and the characteristic strength ratio c y of SDOF system under earthquakes are studied.The μ Δ-c y-Δ y spectrum,namely characteristic ductility ratio spectrum(CDRS),is established.Two methods of determining the yield base shear and the yield top displacement of RC frames are suggested.By transferring of elastic MDOF system to SDOF system,and elastic-plastic SDOF system to MDOF system,and by using CDRS,the inelastic displacement demand of regular RC frames can be determined by the elastic parameters of the structure.The approach for estimating the target displacement of RC frame is illustrated by a 12-storey RC frame sample.