基于构件耗能分布的钢筋混凝土框架非线性地震反应分析  

Nonlinear Seismic Response Analysis of Reinforced Concrete Frame Structure Based on Member's Energy-Dissipation Distribution

作　　者：肖同亮 刘如驰 邱洪兴[3] 

机构地区：[1]南京工程学院建筑工程学院,江苏南京211167 [2]南京市建筑设计研究院有限责任公司,江苏南京210005 [3]东南大学土木工程学院,江苏南京210096

出　　处：《工程抗震与加固改造》2017年第6期26-31,共6页Earthquake Resistant Engineering and Retrofitting

基　　金："十二五"国家科技支撑计划资助项目(2012BAJ14B02);江苏省高校自然科学基金资助项目(17KJB560005);南京工程学院校级基金资助项目(YKJ201511)

摘　　要：为了研究地震作用下钢筋混凝土框架结构构件的耗能分布及其转化规律,基于材料本构关系和多弹簧单元模型建立了1个规则的多层框架结构计算模型,进行了8度罕遇地震作用下能量时程分析,得到了各构件的滞回耗能和塑性铰分布情况。计算结果表明:各层梁、柱滞回耗能占总滞回耗能的比值呈现下大上小趋势,由于底层柱相对薄弱,其滞回耗能占结构总滞回耗能比例较大;各层内梁滞回耗能要小于外梁,中柱滞回耗能大于边柱;结构塑性铰首先出现在最薄弱的底层梁端和柱根,此阶段主要通过柱的变形来储存和消耗能量,随着地震波的持续输入和结构非线性的发展,塑性铰从底层向上逐步开展,耗能转为由梁起主导作用。由于该模型考虑了楼板翼缘效应,结构并未完全按照"梁铰"机制破坏,而是按照"混合"机制破坏,这可能导致结构因为柱的破坏而过早失效。In order to study the seismic performance of reinforced concrete frame structure based on energy-dissipation distribution and transformation,the reinforced concrete structure model is established by material constitutive relations and multi-spring truss element.The hysteretic energy dissipation of each components and the plastic hinge distribution are conducted by the energy time history analysis under the rare 8 degree earthquake.The calculation results show that hysteretic energy dissipation ratio of components in each layer presents bigger in low layers and smaller in high layers.Due to the relatively weak underlying column,the ratio of hysteretic energy dissipation to total is bigger than other layers;the hysteretic energy dissipation of central beam is less than side beam except top layer while central column is more than edge column;the plastic hinges first appear at the feeble bottom components,especially at beam end and column root,in this stage energy the reservation and dissipation are mainly through the deformation of column.With the continuous input of seismic wave and the development of structure nonlinear,the plastic hinges gradually extend from the bottom to the top,at the same time,the beam plays a dominant role in energy dissipation.Considering the floor effect in the model,the structure is not completely damaged in accordance with the ＂beam hinge mechanism＂,while turning out ＂hybrid＂ damage,which may lead to premature failure of structure because of the column destruction.

关 键 词：滞回耗能 框架结构 时程响应 塑性铰 

分 类 号：TU375.4[建筑科学—结构工程] TU323.5