SRC异形十字边框柱-RC剪力墙抗震性能分析

Analysis of Seismic Properties of RC Shear Wall with SRC Specially-shaped Cross Columns Frame

针对钢筋混凝土剪力墙抗震性能不足的缺陷,在剪力墙的边缘设置SRC异形边框柱,提出了一种新型混合剪力墙结构。为验证SRC异形十字边框柱-RC剪力墙的抗震性能,基于开源分析程序Opensees,剪力墙采用分层壳单元,外围SRC异形柱框架采用纤维梁柱单元,对缩尺比为1∶2.5的模型结构进行静力弹塑性分析和滞回性能分析。得到构件不同轴压比情况下的pushover曲线、边框柱、剪力墙承担的剪力分配情况、滞回曲线以及等效粘滞阻尼系数。研究结果表明:剪力墙承担了大部分剪力,相比于RC剪力墙,SRC异形边框剪力墙的延性、抗剪承载力、极限位移以及耗能能力均有不同程度的提高,并且随着轴压比增大,提高系数下降。设置SRC异形边框柱有效地改善了RC剪力墙在地震作用下的抗震性能。

Aiming at the defects of reinforced concrete shear wall that the seismic behavior is insufficient,this paper sets SRC specially-shaped columns at the edge of RC shear wall,and puts forward a new mixed structure.In order to verify the seismic properties of shear wall with SRC specially-shaped cross columns frame,this paper conducts pushover analysis and hysteretic analysis on the basis of shell element and fiber element in open system Opensees.The RC shear wall adopts ShellMITC4 element,and the SRC specially-shaped columns adopt dispBeam-Column element.They are connected by zerolength element.The model is on a scale of 1∶2.5.Pushover curves,shears borne by columns and shear wall,hysteretic curves and equivalent damping ratio of specimens are obtained under different axial compression ratio.The study results show that the two component can form a whole,RC shear wall bears most shears,compared with RC shear wall.The ductility,maximum shear,and energy dissipation capacity of the mixed structure are improved in different degrees.With the axial compression ratio increase,the ratio of the improvement gradually decreases.The new structure can improve seismic behavior effectively under earthquake.