考虑悬索作用钢筋混凝土梁柱子结构抗倒塌性能试验研究  

Experimental study of the collapse-resistant behavior of RC beam-column sub-structures considering catenary action

作　　者：何庆锋[1] 易伟建[1] 

机构地区：[1]湖南大学,湖南长沙410082

出　　处：《土木工程学报》2011年第4期52-59,共8页China Civil Engineering Journal

基　　金：国家自然科学基金(50678064);湖南省重点实验室重点项目(06FJ3003);"十一五"国家科技支撑计划重大项目(2006BAJ04A13)

摘　　要：在爆炸及冲击荷载作用下,没有经过抗倒塌设计的高层建筑可能会产生不成比例的倒塌破坏。通过变化配筋率、钢筋等级、加载速度等方式完成5个约束梁试验,研究钢筋混凝土柱失效情况下,梁柱子结构在考虑悬索作用效应时的抗倒塌性能。试件两端预埋钢管并通过钢轴与钢箱上的支座连接,电液伺服作动器在预定时间内采用位移控制连续加载,在大约400mm位移时试件由于钢筋的断裂发生倒塌破坏,此时试件的承载能力大约是塑性阶段的2倍而位移将近20倍。基于试验结果和现象,对试件的受力过程、力的转换机制以及悬索作用机理进行分析与探讨,并对梁柱子结构抗倒塌设计提出悬索作用的简化计算方法。Under blast or impact loads,disproportionate collapse would be likely for a majority of high-rise buildings without special collapse-resistant design.Five axially restrained beam tests with various reinforcement ratios,various classes of steel bar,and various loading velocity,were conducted.The collapse-resistance behavior of beam-column sub-structures was studied considering catenary action under the failure of RC column.Both ends of the specimens were pin-connected and fixed on steel boxes and two steel tubes were embedded in both ends of the specimen.The load was continuously applied on the top of the middle column in scheduled time by the servo-hydraulic actuator with displacement-controlled mode,and the pin-supported RC beam-column experienced elastic,plastic and catenary stages.The collapse occurred at a vertical displacement of about 400mm due to the rupture of the bottom steel bars,and the member ultimate capacity was about 2 times as much as the plastic stage,but the displacement was nearly 20 times more.Based on the experimental results,the applied load process was analyzed and the transition process of the applied load mechanism was discussed,and a simplified calculation method for catenary action was presented for collapse-resistant design of beam-column sub-structures.

关 键 词：倒塌破坏 倒塌试验 悬索作用 抗倒塌设计 梁柱子结构 

分 类 号：TU375.1[建筑科学—结构工程] TU375.3