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框架结构实现“梁铰屈服”机制是保证大震不倒的措施之一。本文在以往研究的基础上,提出楼板局部设缝框架结构,即在框架梁端塑性铰范围的侧向楼板内设置贯穿板厚的通缝,以消除现浇楼板及其纵筋对梁端抗弯承载力的贡献,实现梁铰屈服机制。文章针对7度和8度设防烈度的设缝框架和传统框架分别进行静力弹塑性分析,研究结构P-Δ变形曲线、塑性铰分布以及结构的屈服机制,并分别对楼板局部设缝框架和传统框架进行抗震能力评估。结果表明,楼板局部设缝能改善框架结构的屈服机制,满足“强柱弱梁”抗震要求,提高结构抗震性能。
Frame structure to achieve “beam yield” mechanism is one of the measures to ensure that the earthquake does not fall. Based on the previous research, this paper proposes a local seam-seamed frame structure in the floor, which is to set the through seam through the thickness in the lateral floor of the plastic hinged frame at the beam end so as to eliminate the bending moment of the cast- Force contributions to achieve beam hinge yield mechanism. In this paper, static elastic-plastic analysis is carried out on the seams frame and the traditional frame of 7 degree and 8 degree fortification intensity to study the structure P-Δ deformation curve, the plastic hinge distribution and the yield mechanism of the structure respectively. The traditional framework for seismic capacity assessment. The results show that the partial crevice of the floor can improve the yield mechanism of the frame structure and meet the seismic requirements of the strong column weak beam and improve the seismic performance of the structure.