HRB500级并筋混凝土柱抗震性能有限元分析

发布时间：2018-03-16 10:45

本文选题：HRB500级钢筋　切入点：并筋　出处：《南昌航空大学》2017年硕士论文　论文类型：学位论文

【摘要】：实际建筑工程中经常会遇到由于配筋密集引起的设计、施工困难问题,工程中会采用绑扎多根单筋成束,即并筋构造来解决问题。我国《混凝土结构设计规范》(GB 50010-2010)中首次提出了并筋的构造规定,并筋造成的粘结锚固性能下降,在配置高强钢筋的情况下尤为突出。本文在现有HRB500并筋混凝土柱试验的基础上,结合并筋粘结锚固拉拔试验进行ANSYS有限元模拟分析,得出并筋混凝土柱应力、应变、裂缝、承载力及延性系数相关结论,为今后并筋混凝土柱的应用参考。主要工作如下:(1)利用ANSYS有限元软件模拟并筋混凝土柱开裂、屈服、破坏的过程,得出随着并筋数量增加,构件极限承载力下降、整体变形增大、延性系数下降的结论,有限元分析结果与试验结果基本一致。并筋混凝土柱延性系数下降幅度最大为13.1%,对构件抗震性能有一定的影响。(2)对比考虑不同钢筋混凝土粘结滑移本构关系对并筋混凝土柱承载力、位移的影响。利用ANSYS有限元软件分别按同课题组拉拔试验粘结滑移本构关系、考虑Houde经验公式粘结滑移本构关系、不考虑钢筋与混凝土的粘结滑移3种情况建模分析。结果表明:考虑粘结滑移本构关系的有限元模型,承载力下降、位移减小,与并筋混凝土柱试验结果更吻合;并筋与混凝土之间按Houde滑移本构关系分析结果比按拉拔试验滑移本构关系分析结果承载力更小,但差异在5%范围内,对于HRB500钢筋并筋也可采用Houde滑移本构关系进行分析。(3)在按并筋等效原则和应用Houde粘结滑移本构关系的前提下,调整构件轴压比和混凝土强度,分析HRB500并筋混凝土柱受力性能和抗震性能。结果表明:构件轴压比上升时,构件承载力和延性整体下降,并筋混凝土柱极限承载力下降速率与单筋混凝土柱类似,并筋混凝土柱延性下降速率高于单筋混凝土柱;使用高强混凝土的情况下,并筋混凝土柱构件极限承载力与单筋混凝土柱差距不大;随着混凝土等级增加,构件延性增加,并筋混凝土柱构件延性的上升速率小于单筋混凝土柱构件。
[Abstract]:In actual construction projects, the design and construction difficulties caused by the dense reinforcement will often be encountered. In the engineering, many single tendons will be bound to form bundles. In our country's Code for Design of concrete structures (GB 50010-2010), it is the first time that the construction regulation of parallel reinforcement is put forward, and the bonding and anchoring performance of the reinforcement decreases. In this paper, the stress, strain and crack of reinforced concrete column are obtained by ANSYS finite element simulation analysis, based on the existing test of HRB500 reinforced concrete column, combined with the test of bond anchoring and drawing of parallel reinforcement bar, the stress, strain and crack of reinforced concrete column are obtained. The conclusions of bearing capacity and ductility coefficient are used as reference for the application of reinforced concrete columns in the future. The main work is as follows: 1) using ANSYS finite element software to simulate the process of cracking, yielding and failure of reinforced concrete columns, it is concluded that with the increase of the number of parallel reinforcement, The conclusion that the ultimate bearing capacity of the member decreases, the whole deformation increases and the ductility coefficient decreases, The results of finite element analysis are in good agreement with the experimental results. The ductility coefficient of reinforced concrete columns decreases by the maximum of 13.1, which has a certain effect on the seismic behavior of members. Bearing capacity of reinforced concrete columns, The influence of displacement. The bond-slip constitutive relation of Houde empirical formula is considered by using ANSYS finite element software according to the bond-slip constitutive relation of drawing test in the same group. The results show that the finite element model considering the bond-slip constitutive relationship decreases the bearing capacity and displacements, which is more consistent with the experimental results of concrete columns with parallel reinforcement. The results of Houde's slip constitutive relation analysis between the steel bars and the concrete are smaller than that of the tensile test's slip constitutive relations, but the difference is in the range of 5%. The Houde slip constitutive relation can also be used for the analysis of HRB500 steel bars. (3) on the basis of the equivalent principle of parallel reinforcement and the application of Houde bond-slip constitutive relation, the axial compression ratio and the strength of concrete can be adjusted. The results show that the ultimate bearing capacity and ductility of HRB500 reinforced concrete columns decrease when the axial compression ratio increases, and the decreasing rate of ultimate bearing capacity of reinforced concrete columns is similar to that of single reinforced concrete columns. The decreasing rate of ductility of reinforced concrete columns is higher than that of single reinforced concrete columns. Under the condition of high strength concrete, the ultimate bearing capacity of concrete columns with parallel reinforcement is not far from that of concrete columns with single reinforcement. With the increase of concrete grade, the ductility of concrete columns increases. The rising rate of ductility of concrete column members with parallel reinforcement is smaller than that of concrete columns with single reinforcement.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.3;TU352.11

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