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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。
Based on the elasto-plastic analysis software, the influence of stair participation in the overall work on the frame structure and the frame-shear structure under rare earthquakes is analyzed. The locations of the plastic hinges, the order of plasticity, the rigidity of the corner posts in the stairwell, The influence of bias on the torsion of the frame structure, the contribution of the stiffness of the staircase to the length of the wall limbs, and the like. The calculation results show that the stairs should be involved in the overall structural calculation to accurately reflect the deformation, internal forces and damage under the earthquake. For framed structures, staircases, ladders, ladders and ladders are the first to yield and destroy in earthquakes and are weak parts of the structure and should be strengthened in the design. For the frame-shear wall structure, the influence of the stairs decreases with the increase of the lateral stiffness of the shear wall.