水平荷载作用下RC剪力墙有效刚度研究

采用MSC.Marc建立了钢筋混凝土剪力墙的精细有限元分析模型,并采用试验数据对分析模型进行验证.在此基础上,对有限元模型进行参数分析,研究了剪跨比、轴压比、纵筋强度、约束构件的配筋率、混凝土强度等5个参数对水平荷载作用下剪力墙有效刚度折减系数的影响.分析结果表明,相对于其他参数,轴压比是影响剪力墙有效刚度的主要因素.基于参数分析结果提出了一个计算剪力墙有效刚度的简化公式,简化公式计算结果与试验结果吻合良好,表明简化计算公式合理可靠,可供工程设计参考.

Effective Stiffness of Reinforced Concrete Shear Wall under Lateral Load

Reinforced concrete shear walls are the primary lateral-load carrying elements in the high-buildings. Its stiffness property has significant influence on the internal force distribution of structures. Reinforced concrete shear walls were set up by MSC.Marc and validated by comparing with lots of test data. A parametric study was conducted on reinforced concrete shear wall to study effective stiffness influenced by the shear-span-to-wall-length ratio, axial compression ratio, yield strength of longitudinal bars in wall boundaries, longitudinal reinforcement content in wall boundaries and concrete strength. The results show that axial compression ratio is the main factor. A simplified formula to evaluate the effective stiffness of reinforced concrete shear wall was proposed on the basis of the parametric study. The results obtained from the simplified formula is in good agreement with those from experiments. It proves that the simplified formula is reasonable and reliable and can be used for reference.