不同轴力对钢筋混凝土剪力墙抗震性能的影响

轴向力对钢筋混凝土剪力墙在反复荷载作用下的承载力和延性等性能具有显著影响。为系统研究轴拉力和轴压力对钢筋混凝土剪力墙的抗震性能影响规律,本文基于有限元软件开展了剪力墙拉剪性能和压剪性能的数值模拟研究。基于反复荷载作用下剪力墙的试验结果与分析模型计算结果的对比,验证了分析模型的合理性。通过7片钢筋混凝土剪力墙的受力性能分析,深入探讨了轴力对剪力墙抗震性能的影响规律。结果表明：剪力墙的承载能力和水平抗侧刚度随轴压力的增大而增大,随轴拉力的增大而减小。轴压比为0.1、0.2的剪力墙,延性较好,能够满足抗震要求,剪力墙延性随轴拉力的增大而减小。以《混凝土结构设计规范》中钢筋混凝土剪力墙的斜截面受剪承载力计算公式为基础,提出了轴力影响下剪力墙斜截面受剪承载力的分析预测公式。

Study on the Seismic Performance of Concrete Shear Walls under varied Axial Force

The axial force has a significant impact on lateral bearing capacity and ductility of concrete shear wall under cyclic load. To analyze the influences of compressive force and tensile force on the seismic performance of concrete shear wall, the finite element analysis for compression-shear performances and tension-shear performances were conducted. Experimental results and analysis results of shear wall under cyclic load were compared, and the rationality of the finite element model was verified. The influences of varied axial force on the seismic performance of concrete shear walls were studied based on seven concrete shear walls. The results show that lateral bearing capacity and lateral stiffness of shear walls can be increased with the increase of compressive force, and be decreased with the increase of tensile force. Ductility of shear walls under the axial compression ratio about 0.1 and 0.2 are relatively better and requirements of the design code can be satisfied. Ductility of shear walls can be decreased with the increase of tensile force. Based on the calculation formula for shear capacity of concrete shear walls in the code for design of concrete structures, the predicted formula for shear capacity of shear walls under varied axial force were proposed.