焦  柯，陈润辉
(广东省建筑设计研究院，广州510010)

[摘要] 基于弹塑性分析软件，分析了罕遇地震作用下楼梯参与整体工作对框架结构和框剪结构不同的影响，包括塑性铰出现的位置、各构件进入塑性的顺序、楼梯间角柱的刚度退化、楼梯偏置对框架结构的扭转影响、楼梯刚度贡献与墙肢长度关系等。计算结果表明，楼梯应参与结构整体计算才能准确反映结构在大震下的变形、内力和损伤。对于框架结构，梯间角柱、梯梁、梯柱和梯板在地震中首先屈服并破坏，是结构的薄弱部位，应在设计中加强。对于框架剪力墙结构，楼梯的影响随着剪力墙侧向刚度的增大而减小。
[关键词] 楼梯；建筑结构；静力弹塑性分析；动力弹塑性分析；刚度退化

Elastic-plastic analysis on staircase participated in the working of building structure
Jiao Ke, Chen Runhui
(The Architectural Design and Research Institute of Guangdong Province, Guangzhou 510010, China)

Abstract: Based on the elastic-plastic analysis software, the effect of staircase participated in the working of frame structure and frame-shear wall structure under strong earthquake are estimated. The location of plastic hinge, the order of the components damage, the stiffness degradation of the comer column,  the effect of torsion of the staircase eccentrically placed in frame structure and the relationship between the stiffness contribution of the stairs and the length of the branches of shear wall are analyzed. The results show that, in order to accurately reflect the deformation, internal force and damage of the structure under strong earthquake, the stairs should be involved in the overall analysis of building structure. For frame structure, corner column in staircase, staircase beam, staircase column and the slab of staircase are firstly yielded and damaged. They are the weak ptuls of the structure and should be strengthened in design. For frame-shear wall structure, the effect of the stairs will reduce with the increasing of lateral stiffness of the shear wall.
Keywords: staircase; building structure; Pushover analysis; dynamic elastic- plastic analysis; stiffness degradation