HRB600级钢筋高强混凝土柱的轴心受压性能

发布时间：2018-11-27 15:04

【摘要】：为了解HRB600级钢筋高强混凝土柱的轴心受压力学性能,对5根截面尺寸为600 mm×600 mm、不同设计参数的高强混凝土柱进行轴压试验,其中4根柱的纵筋为HRB600级钢筋,1根柱的纵筋为HRB400级钢筋。在试验基础上,采用非线性有限元模型进行数值模拟,探讨混凝土强度、配箍率及箍筋强度等设计变化参数对HRB600级钢筋高强混凝土柱轴压性能的影响规律,对中、美、日三国《混凝土结构设计规范》中轴压承载力计算法的适用性进行验证。研究结果表明:随着混凝土强度等级的提高,HRB600级钢筋高强混凝土柱的承载力明显提高,轴压刚度有所提高,荷载-变形曲线下降段变陡;随着配箍率的增大,柱的承载力、延性有所提高,轴压刚度略有提高;随着箍筋强度的提高,柱的承载力、轴压刚度变化不大,但其峰值后的性能改善明显;当HRB600级钢筋的抗压强度值取500 MPa时,按中、美、日三国《混凝土结构设计规范》推荐的承载力计算式都有足够的安全储备。
[Abstract]:In order to understand the axial compression mechanical properties of HRB600 grade reinforced high strength concrete columns, five high strength concrete columns with different design parameters of 600 mm 脳 600 mm, cross-section were tested under axial compression. Among them, 4 columns have longitudinal reinforcement of HRB600 grade. The longitudinal reinforcement of one column is HRB400 grade steel bar. On the basis of experiment, the nonlinear finite element model is used to simulate the influence of design parameters such as concrete strength, hoop ratio and stirrups strength on the axial compression behavior of HRB600 grade high strength concrete columns. The applicability of the method for calculating the bearing capacity of concrete structures under axial compression is verified by the code for design of concrete structures in three countries of Japan. The results show that with the increase of the strength grade of concrete, the bearing capacity of HRB600 grade reinforced high-strength concrete columns is obviously increased, the axial compression stiffness is improved, and the falling section of load-deformation curve becomes steeper. With the increase of hoop ratio, the bearing capacity, ductility and axial compression stiffness of the column increase slightly, but with the increase of stirrups strength, the bearing capacity and axial compression stiffness of the column change little, but the performance of the column after the peak value improves obviously. When the compressive strength of HRB600 grade steel bar is taken as 500 MPa, there is sufficient safety reserve according to the calculation formula of bearing capacity recommended by China, America, Japan and other three countries (Code for Design of concrete structures).
【作者单位】：城市与工程安全减灾教育部重点实验室北京工业大学;中建二局第三建筑工程有限公司;
【基金】：国家重点研发计划项目(2016YFC0701104) 国家自然科学基金项目(51678009)
【分类号】：TU375.3

【相似文献】