多连梁剪力墙抗震性能研究

针对剪力墙结构设计中容易出现连梁剪压比不足的问题，提出多连梁的设计理念，通过设置多个连梁代替传统单连梁的方式，可以有效增大连梁的抗剪面积与跨高比，明显改善结构的抗震性能。确定多连梁截面尺寸的基本原则是结构的侧向刚度与单连梁保持不变。对剪力墙结构在多遇地震作用下进行了详细分析，全面比较了多连梁与单连梁对结构动力特性、层间位移角、侧向刚度和构件内力的影响以及对改善连梁剪压比的作用。对剪力墙结构进行了在罕遇地震作用下的弹塑性时程分析，研究了多连梁剪力墙结构对最大层间位移角、塑性铰分布、抗剪承载力及结构非线性耗能能力的改善效果；采用非线性有限元法对连梁在往复地震作用下的抗震性能进行了研究。结果表明:由于多连梁跨高比大，其破坏形态从剪切破坏转化为弯曲破坏，构件的延性显著增大。

Research on Seismic Behavior of Multi-coupling Beams in Shear Wall Structure

To tackle the insufficient of shear compression ratio in design of shear wall structure, the design concepts of multi-coupling beams were proposed. By setting multi-coupling beams rather than the traditional single coupling beam, the shear resistance area and the span to depth ratio could be significantly strengthened, thus the seismic behavior of the structure was enhanced. The sectional dimensions of multi-coupling beams were determined by making the lateral stiffness of the structure remain unchanged with that of the single coupling beam. Multi-coupling beams and single coupling beam were compared under frequent earthquake actions in terms of structural dynamic behavior, storey drift ratio, lateral stiffness and impact of member internal forces, as well as influence on improving shear compression ratio. The elastoplastic time history analysis of shear wall structure under rare earthquake action was conducted to prove that multi-coupling beams in the shear wall structure could improve the maximum storey drift ratio, the distribution of plastic hinge, shear capacity and structural nonlinear energy dissipation capacity. The seismic behavior of coupling beams under earthquake action was investigated using nonlinear finite element method. The results show that due to the larger span to depth ratio of multi-coupling beams, the ductility of members increases greatly, thus the failure patterns change from shear failure to flexural failure.