竖向地震作用下PSRC框架梁延性性能及有限元分析  

Behavior of Ductility and Finite Element Analysis on Prestressed Steel Reinforced Concrete Frame Beam under Vertical Seismic

作　　者：高峰[1] 熊学玉[2] 张少红 苑辉 

机构地区：[1]济南大学土木建筑学院,山东济南250022 [2]同济大学建筑工程系,上海200092 [3]山东省工程建设标准定额站,山东济南250001 [4]山东省交通规划设计院,山东济南250031

出　　处：《应用基础与工程科学学报》2016年第3期595-607,共13页Journal of Basic Science and Engineering

基　　金：山东省交通运输科技计划项目(2015B30);住房和城乡建设部研究开发项目(2014-K2-029);山东省住房城乡建设科学技术计划项目(KY027);国家自然科学基金项目(51178328);济南大学博士基金(XBS1340)

摘　　要：通过1榀梁柱均含型钢的预应力型钢混凝土框架竖向低周反复荷载试验,研究预应力型钢混凝土(PSRC)框架梁在竖向地震作用下的破坏形态、滞回特征、延性性能及耗能能力.结果表明:PSRC框架梁发生'三铰'的梁铰破坏机制,滞回曲线饱满,具有良好的延性和抗震耗能能力.利用ABAQUS软件对试验试件进行了有限元模拟,计算结果与试验结果吻合较好;在此基础上对该结构进行参数分析,研究混凝土强度、含钢率、预应力强度比及换算配筋率对P-Δ骨架曲线和延性性能的影响.结果表明:增大混凝土强度、预应力强度比、换算配筋率,框架梁承载力增加,但延性降低;随着含钢率的增加,框架梁承载力及延性均增大.通过位移延性系数分析,本文建议含钢率范围为4%~8%,预应力强度比λ不宜大于0.6,换算配筋率不宜大于3.6%.提出竖向地震作用下位移延性系数的计算方法,可供工程设计时参考.Based on the experimental study on prestressed steel reinforced concrete( PSRC) frame with steel in beams and column under vertical low cyclic reversed loading,the final failure mode,load-displacement hysteretic loops,displacement ductility and energy dissipation of PSRC frame beam were investigated. The results show that its failure patterns is'three hinge'failure mechanisms and load-displacement hysteretic loops are in plump-shape,and the frame beam has good ductility and energy dissipation capacity. The finite element analysis software ABAQUS was used to simulate the properties of specimens,the calculation results agreed with test results very well. Parametric analysis of the structure was carried out to study the impact on the skeleton curves of load-displacement and ductility of the PSRC frame beam. The concrete strength,ratio of encased steel,ratio of prestressing strength and ratio of the converted reinforcement were all considered as analysis parameters. The results show that ratio of prestressing strength,ratio of the converted reinforcement,the load-bearing capacity are improved with the increase of the concrete strength,but the ductility is lower,and the loadbearing capacity and the ductility are improved with the increment of ratio of encased steel.Based on the ductility analysis,some proposal are putted forward,which including ratio of encased steel is 4% ~ 8%,ratio of prestressing strength is not greater than 6% and ratio of the converted reinforcement is not more than 3. 6%. Finally,the calculating method of displacement ductility coefficient was proposed and could provide reference for engineering design.

关 键 词：预应力 型钢混凝土结构 延性 有限元分析 参数分析 

分 类 号：TU398.9[建筑科学—结构工程]