剪力墙与框架梁的连接过渡算法研究

Research on connection transition algorithm of shear wall and frame beam

建筑结构中的剪力墙与框架梁的平面内连接是一个较难解决的问题,原因主要是由于框架梁是一维单元,仅由单一结点与剪力墙相连,若不加处理,即使剪力墙单元在平面内含有旋转自由度,墙与梁的连接刚度依然会过低(接近于铰接),不能正确传递位移和内力,从而导致计算结果失真。为改善这一问题,提出了三种剪力墙与框架梁的连接过渡处理方法:罚单元法、直接消去法以及过渡单元法。数值试验表明,罚单元法、直接消去法以及过渡单元法具有广泛的适应能力,可对连接部位自动处理并给出合理的计算结果。目前上述算法已在北京市建筑设计研究院有限公司自主研发的设计软件Paco中完整实现,并取得了良好的应用效果。

In-plane connection between shear wall and frame beam in building structure is a difficult issue. It is because that the frame beam is one-dimensional element connected with the shear wall by only one node. The connection stiffness between shear wall and frame beam could be too weak （ similar to hinge） even though the shear wall element contains in-plane rotation freedom. Therefore, displacements and internal forces can not be transferred correctly, leading to distortion of the results. To solve this problem, three approaches of connection transition treatment between shear wall and frame beam were proposed： penalty element method, direct elimination method and transition element method. Numerical experiments show that the proposed methods have wide adaptability, can handle the connection part automatically and give reasonable calculation results. At present, the proposed algorithms have been implemented completely in structural design software Paco which is developed independently by Beijing Institute of Architectural Design, and satisfactory results have been achieved.