HRB600级钢筋高强混凝土柱的轴心受压性能  

RESEARCH ON AXIAL COMPRESSION PERFORMANCE OF HIGH STRENGTH CONCRETE COLUMNS WITH HRB600 STEEL BARS

作　　者：张建伟[1] 夏冬瑞 乔崎云 姜立伟 

机构地区：[1]城市与工程安全减灾教育部重点实验室北京工业大学,北京100124 [2]中建二局第三建筑工程有限公司,北京100070

出　　处：《工业建筑》2017年第11期77-83,共7页Industrial Construction

基　　金：国家重点研发计划项目(2016YFC0701104);国家自然科学基金项目(51678009)

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。In order to investigate the axial compression performance of high-strength concrete column with HRB600 steel bars,five high-strength concrete columns with cross-section dimension of 600 mm × 600 mm and different design parameters were tested.The longitudinal reinforcement of the four specimens was HRB600 steel bar,and HRB400 steel bars for the longitudinal reinforcement of one specimen.Based on the experiment,the nonlinear finite element model was established and the numerical simulation was carried out.The influence of design parameters such as concrete strength,stirrup ratio and stirrup strength on the axial compression behavior of concrete columns with HRB600 steel bars was discussed.The applicability of the codes for design of concrete structures in different countries to calculate the axial compression bearing capacity of high-strength concrete column with HRB600 steel bars was confirmed.The results showed that with the increase of the strength grade of concrete,the bearing capacity of high-strength concrete column with HRB600 steel bars was obviously improved,the axial compressive stiffness increased and the descending section of the axial load-deformation curve became steep.With the increase of the stirrup rate,the bearing capacity and ductility of the column were improved and the axial compression stiffness was increased slightly.With the increase of the strength of the stirrup,the bearing capacity and axial compressive stiffness of the column were not changed significantly,but the post-peak behavior was improved obviously.When the compressive strength of HRB600 steel bar was taken as 500 MPa,the calculated axial compressive bearing capacity of high-strength concrete columns according to the codes of China,the United States and Japan were all sufficient in safety reserve.

关 键 词：HRB600级钢筋 高强混凝土柱 轴压性能 单调荷载试验 数值模拟分析 

分 类 号：TU375.3[建筑科学—结构工程]