【摘要】 使用防屈曲支撑替换钢支撑钢框架结构中的中心支撑,按等刚度替换方法和减刚度替换方法设计三种不同的替换方案,采用振型分解反应谱法和静力弹塑性分析法对比分析钢框架结构、钢支撑框架结构和防屈曲支撑钢框架结构的地震反应。结果表明:多遇地震下,中心钢支撑和防屈曲支撑都能为结构提供抗侧刚度,减小框架柱承担的剪力和倾覆弯矩,减小结构的层间位移;而在罕遇地震下,中心钢支撑发生屈曲,结构的刚度退化严重,结构的抗侧能力较差,而防屈曲支撑屈服不屈曲,结构的刚度减小,但不会产生严重退化,结构的抗侧能力较好。当采用等刚度法将普通支撑替换为防屈曲支撑后,结构中梁铰和柱铰的个数均减少,框架梁的损伤较轻,但首层与支撑相连的柱损伤较严重;当采用减刚度法将普通支撑替换为防屈曲支撑后,结构中柱铰的个数减少,而梁铰的个数增加,与等刚度替换的情况相比,首层与支撑相连的损伤较轻,防屈曲支撑的耗能能力发挥得更加充分。更多还原

【Abstract】 Ordinary concentrically braces(OCB) in steel concentrically braced frames was replaced by buckling restrained braces(BRB),three schemes were designed according to two principles, seismic response analysis of different structures has been carried out The analysis reveals that, ordinary concentrically braces and buckling restrained brace can augment the frame stiffness,decrease the shears and overturning moment of column as well as the story drift in the frequently earthquake, yet in rare earthquake, the frame stiffness decreased largely on account of the ordinary concentrically braces were buckling. By contrast, the buckling restrained brace was yielding instead of buckling, the frame stiffness decrease slightly. When OCB was replaced by BRB in according to equal-stiffness principle, the number of the beam plastic hinge and column plastic hinge were reduced, and the plasticity extent of the beams were reduced, but the plasticity extent of the column attached to BRB were increased When OCB was replaced by BRB in according to lessen-stiffness principle, the number of the column plastic hinge and the plasticity extent of the column attached to BRB were reduced, the number of the beam plastic hinge were increased, the energy-dissipating capacity of BRB can be used more fully.更多还原