RC联肢剪力墙宏观数值计算模型研究

已有的钢筋混凝土联肢剪力墙宏观数值计算模型在墙体单元和连梁单元连接处采用水平变形协调，即连梁单元的梁端转动与墙体单元水平刚性梁的转动变形相协调。然而，水平变形协调并不能反映墙体和连梁的实际变形协调条件。为此，提出了一种钢筋混凝土联肢剪力墙宏观数值计算模型，该模型中墙体单元为具有分布式剪切弹簧且考虑平面外自由度的三维宏观墙体单元模型，连梁单元为具有3个子单元串联的一维杆单元模型，墙体单元与连梁单元的连接采用竖向变形协调，即连梁单元的梁端转动与墙体单元边垂直杆元的变形相协调。并通过算例对其模拟的准确性进行校验。结果表明：采用竖向变形协调方式建立的计算模型能更加准确地模拟联肢剪力墙的力学行为，提出的钢筋混凝土联肢剪力墙宏观数值计算模型可用于三维的非线性分析，其中墙体单元能更好地模拟剪切变形和面外变形，连梁单元能够更好地模拟与墙肢的变形协调。

Macro numerical model for coupled RC shear walls

The connection between the coupling beam and wall pier in existing macro numerical models for coupled RC shear walls adopts the horizontal deformation compatibility, namely, the rotation at the end of the coupling beam coincides with the rotation of the horizontal rigid beam of the wall element. However, the horizontal deformation compatibility cannot reflect the actual deformation compatibility condition between the coupling beam and the wall pier. To this end, a macro numerical model for coupled RC shear wall is proposed. In this model, the three-dimensional macro shear wall element model (TMSEM) with distributed shear spring and out of plane degree of freedom is adopted to simulate the wall pier, and the one-dimensional line element consisting of three sub-units in series is adopted to simulate the coupling beam. The connection between the coupling beam and the wall pier adopts the vertical deformation compatibility, namely, the rotation at the end of the coupling beam coincides with the rotation of the outer vertical line of the TMSEM. In order to assess the accuracy of this simulation, verification case studies are provided and the results show that the numerical model based on the vertical deformation compatibility results in more accurate simulation of the mechanical behavior of the RC coupled shear wall. The macro numerical model for coupled RC shear walls developed in this study can be used for three-dimensional nonlinear analysis. The wall element can better simulate the shear deformation and the out-of-plane deformation, and the coupling beam element can better simulate the actual deformation compatibility with the wall pier.