地震作用下RC框剪结构剪力墙和框架柱的曲率延性与结构层间位移延性关系

研究地震作用下RC框剪结构的框架柱、剪力墙的曲率延性需求与结构最大层间位移延性需求之间的统计关系。框架柱、梁与剪力墙均采用指定弯矩―曲率关系的滞回单元,建立15层和30层平面RC框架剪力墙数值结构。通过弹塑性静力分析和地震动力时程分析,获得框架柱、剪力墙的曲率延性需求以及结构最大层间位移延性需求,探讨地震加速度峰值、结构弯剪比例对延性需求的影响,分别建立框架柱曲率延性需求与结构层间位移延性需求、剪力墙曲率延性需求与结构层间位移延性需求的定量统计关系。结果表明:框架柱、剪力墙的曲率延性需求和结构层间位移延性需求随地震加速度峰值增加而增加;剪力墙曲率延性需求随弯剪比例系数增加而减小,而框架柱和结构层间位移延性需求随弯剪比例系数增加而增加。考虑弯剪比例影响,拟合建立的函数模型与样本分析数据有较好的吻合,可指导RC框剪结构的初步抗震延性设计和评估。

Relationship between the Curvature Ductility of Shear-wall and Column and the Interstory Displacement Ductility for RC Frame-shear Wall Structures Subjected to Ground Motions

The paper studies the statistical relationship between the curvature ductility demands of reinforced concrete （RC） columns and shear-walls and the maximum interstory displacement ductility demand of frame-shear wall structure under earth-quake.The RC columns,beams and shear wall of structure employ the elements of designated moment-curvature hysteretic-rule,and constitute a 15-storey and a 30-storey RC frame-shear wall numerical structure.By the nonlinear dynamic time anal-ysis and the elastic-plastic static pushover analysis,not only the maximum displacement ductility demand of structure but also the maximum curvature ductility demands of columns and shear walls are obtained.The influences of earthquake peak acceler-ation and bending-shear ratio on the ductility demands are investigated.The quantitative relationship between the curvature ductility demands of columns and the structural interstory displacement ductility demand,as well as relationship between the curvature ductility of shear walls and the interstory displacement ductility demands are established.The results show that the curvature ductility demands of columns,shear walls and the interstory displacement ductility demands increase with increase in earthquake peak acceleration;the curvature ductility demands of shear wall decrease with increase in bending shear ratio,but the curvature ductility demands of columns and the interstory displacement ductility demands increase with increase in bending shear ratio.The function model considering the influence of bending shear ratio is identical with the sample data of analysis, which can guide the ductility design and assessment of RC frame shear wall structure.