【作者】 陈伯望； 王海波； 沈蒲生；

【Author】 Chen Bowang Wang Haibo Shen Pusheng (College of Civil Engineering,Hunan University,Changsha 410082,P.R.China)

【机构】 湖南大学土木工程学院；

【摘要】 制作了一个14层的钢筋混凝土筒中筒模型结构,模型比例1:10,等效为两自由度体系,进行了6种工况的地震波加速度峰值的拟动力试验,研究了筒中筒结构在地震作用下的动力特性、弹性和弹塑性阶段的地震反应、抗震性能和破坏机理。研究表明,该结构在7度罕遇地震作用下仍处于弹性状态,9度罕遇地震作用下,核心筒除与底板相交处开裂外无其他可见裂缝,而外框筒开裂严重,但结构仍具有较高的承载能力和侧向刚度,结构最大层间位移角仅1/148。实测滞回曲线反应了筒中简结构具有良好的延性和耗能性能。最后,采用改进了的非线性杆单元模型编写了程序, 对筒中筒结构进行了非线性分析,结果表明位移时程曲线计算值与试验值基本吻合。更多还原

【Abstract】 A1/10 scale 14-storied tube in tube structure model,which was equivalent as two degree of freedom,has been executed a pseudo-dynamic testing with six cases acceleration earthquake wave.The dynamic characteristic, earthquake response in elastic and elastic-plastic stage,seismic behavior and failure mechanism of the model have been studied.The test indicated that the model was in elastic under seismic seldom intensity of 7 degree and that outer tube cracked seriously but the structure behaved perfect bearing capacity and lateral stiffness under seismic seldom intensity of 9 degree,in which the maximum story drift rotation reached merely 1/148.Hysteresis curve of the structure showed superior performance of ductility and energy dissipation.Finally,a FEM program on the basis of the advantaged non-line-bar element model have been developed in the paper,calculation results of displacement time-history curve being in good agreement with those of the tests.更多还原