【摘要】 基于对一个大尺度RC梁柱节点在低周反复荷载下的加载试验,研究节点的破坏形态、承载能力、滞回特性和耗能能力等抗震性能。并与已有的两个中小尺度梁柱节点的试验数据进行对比,分析尺寸效应对其的影响。结果表明:这些节点都经历了核芯区开裂、梁端屈服、核芯区通裂、剪切极限直至破坏的过程。但是,随着尺寸的增加,节点核芯区斜裂缝的数量明显增多,斜裂缝带中间宽两端细的趋势更加明显。特别在加载后期,大构件节点核芯区的变形和抗剪承载能力下降,刚度衰减加快,耗能能力和延性明显下降。由此看来,在混凝土结构的抗震设计中应该对构件尺寸效应给予更多的注意。更多还原

【Abstract】 The reversed cyclic loading test of a large-scale beam-column joint is carried out to study its seismic performance,including the load-carrying capacity,failure pattern,hysteretic behaviors,ductility and energy dissipation characteristics,and the results are compared with other relatively smaller specimens for evaluation of the size effect on the seismic performance of structural components.The test results show that the process of joint failure starts from cracking,then yielding developed at beam end,and then the joint becomes fully cracked and finally leads to failure.However the experiments also show that as the size increases,the quantities of inclined cracks significantly increased and the growth rate of diagonal crack to both ends of the joint accelerated.Moreover,for larger specimen the cracking growth tendency of middle-width and ends-narrow in diagonal crack belt becomes more obvious,and the shear capacity and deformation capacity in joint core is obviously decreased.In particular,at the late loading stage,the stiffness decay for the large specimen accelerated,energy dissipation and ductility decreased obviously.The size effect of structural components should be paid more attentions in seismic design of RC structures.更多还原