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EFFECT OF STIFFNESS RATIO ON THE SEISMIC BEHAVIOR OF BRB-PREFABRICATED CONCRETE FRAME DUAL SYSTEM
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摘要: 针对由装配式混凝土框架(PCF)和屈曲约束支撑(BRB)体系组成的BRB-PCF双重体系,建立不同层数结构的有限元分析模型,并采用非线性动力时程分析方法,研究了刚度比(即BRB体系与PCF体系的抗侧刚度之比)k对结构抗震性能的影响。结果表明:在PCF体系中适当地布置BRB能够减小结构的最大层间位移角和梁、柱构件的损伤程度,提高结构的震后修复效率;当刚度比较小时,增大k能提升结构的抗震性能,但当k≥1.5时,继续增大k对结构抗震性能的提升较小,建议合理的刚度比范围为k≤1.5。Abstract: Aiming at the dual system composed of prefabricated concrete frame (PCF) and buckling restrained brace (BRB) system, the finite element analysis models of different story structures were established, and the influence of stiffness ratio (i.e. the lateral stiffness ratio of BRB system to PCF system) k on the seismic behavior of the structure was studied by using nonlinear dynamic time-history analysis method. The results showed that the proper arrangement of BRB in PCF system could reduce the peak story drifts of the structure and the damage degree of beam and column members, and improve the post-earthquake repair efficiency of the structure. When the stiffness ratio was small, increasing k could improve the seismic behavior of the structure, but when k≥1.5, increasing k would improve the seismic behavior of the structure less, and the reasonable range of stiffness ratio was suggested to be k≤1.5.
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