强震作用下配置高强度钢筋的混凝土框架结构非线性动力反应

发布时间：2018-03-23 08:21

本文选题：混凝土框架结构　切入点：高强钢筋　出处：《建筑结构学报》2014年08期 　论文类型：期刊论文

【摘要】：为研究配置高强度钢筋的混凝土框架的抗震性能,以抗震设防烈度8度区加速度0.3g为例,利用Perform-3D程序进行了5栋配置不同强度等级钢筋的混凝土框架结构在双向罕遇地震作用下的非线性动力反应分析。分析模型以一栋配置强度335 MPa级钢筋的框架结构为基础,分别以钢筋等强代换和规范要求为原则,设计了4栋分别配置强度500 MPa级和600 MPa级钢筋的框架结构。非线性动力反应分析结果表明:随着配筋强度等级的提高,框架的最大顶点位移、最大层间位移角虽有所增大,但仍小于规范的限值,梁端进入屈服较晚,梁端塑性铰的数量也有所减少,表明高强钢筋混凝土框架的整体抗震性能良好。分析结果还表明,以位移延性系数作为衡量构件延性的指标时,配置高强钢筋构件的位移延性系数限值应低于配置普通强度钢筋的构件;而当以极限位移角作为衡量构件的延性指标时,构件的极限位移角限值应随钢筋强度的提高而增大。
[Abstract]:In order to study the seismic behavior of concrete frame with high strength reinforcement, the acceleration of 0.3 g in the 8 degree seismic fortification intensity region is taken as an example. The nonlinear dynamic response analysis of five concrete frame structures with different strength grade reinforced bars under the action of bidirectional rare earthquake is carried out by using Perform-3D program. The model is based on a frame structure with a strength of 335 MPa steel bar. Four frame structures with strength of 500 MPa and 600 MPa of strength are designed based on the principle of equal strength replacement of steel bar and requirements of code. The nonlinear dynamic response analysis results show that: with the increase of strength grade of reinforcement, The maximum vertex displacement and the maximum interstory displacement angle of the frame are increased, but still less than the limited value of the code. The beam end enters the yield later, and the number of plastic hinges at the beam end is also reduced. The results also show that the displacement ductility coefficient is taken as the index to measure the ductility of the members. The limit value of displacement ductility coefficient of high strength reinforced members should be lower than that of members with normal strength steel bars, but when the ultimate displacement angle is taken as the measure of ductility index, the limit value of ultimate displacement angle of members should increase with the increase of reinforcement strength.
【作者单位】：重庆大学山地城镇建设与新技术教育部重点实验室;成都市建筑设计研究院;
【基金】：国家自然科学基金项目(51178487)
【分类号】：TU311.3;TU375.4

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