HRB600级钢筋高强混凝土柱偏心受压性能试验研究
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摘要
为研究HRB600级钢筋高强混凝土柱的偏心受压性能,以推动HRB600级钢筋的工程应用,进行了9根截面尺寸为600 mm×600 mm、混凝土强度等级为C60～C100的高强混凝土柱单调偏心加载试验,其中7根柱的纵筋为HRB600级钢筋,2根柱的纵筋为HRB400级钢筋。分析了钢筋强度、混凝土强度、配箍率及偏心距等参数对钢筋高强混凝土柱偏压性能的影响规律。研究结果表明:HRB600级钢筋高强混凝土柱的破坏特征、挠度曲线、截面应变分布规律与普通钢筋混凝土柱基本一致;大偏心受压状态下,HRB600级钢筋高强混凝土柱受压承载力较HRB400级钢筋高强混凝土柱提高了8.55%,且峰值后的荷载-挠度曲线下降平缓;随着混凝土强度、配箍率和箍筋强度的提高,其压弯承载力均有所提高;采用现行混凝土结构设计规范中的相关公式计算HRB600级钢筋高强混凝土柱的压弯承载力、平均裂缝间距与最大裂缝宽度,具有较好的可靠性。
In order to investigate the eccentric compressive behavior of high-strength concrete columns with HRB600 steel bars to promote their engineering application,nine high-strength concrete columns with cross-section dimensions of 600 mm × 600 mm were tested under monotonic compression;the strength grades of concrete in the columns were C60-C100.HRB600 steel bars were used as longitudinal bars of seven of the nine columns,while HRB400 steel bars were used for the other two columns.The influence of design parameters such as the strength of steel bars,concrete strength,volume ratio of stirrups and load eccentricity on the eccentric compressive behavior of high-strength concrete columns was discussed.The results show that the failure characteristics,deflection curve and cross-sectional strain distributions of high-strength concrete columns with HRB600 steel bars are basically the same as those of high-strength concrete column with HRB400 steel bars.Under the large eccentric compression condition,the compressive bearing capacity of high-strength concrete columns with HRB600 steel bars is 8.55% higher than that of HRB400 steel reinforced concrete columns,and the load decreases gradually after the peak.With the increase of concrete strength grade,volume ratio of stirrups and stirrup strength grade,the compressive bearing capacity of high-strength concrete columns with HRB600 steel bars increases.It is reliable to use the relevant formulae in the current concrete structure design codes to calculate the compression-bending capacity,the average crack spacing and the maximum crack width of high-strength concrete columns with HRB600 steel bars.
In order to investigate the eccentric compressive behavior of high-strength concrete columns with HRB600 steel bars to promote their engineering application,nine high-strength concrete columns with cross-section dimensions of 600 mm × 600 mm were tested under monotonic compression;the strength grades of concrete in the columns were C60-C100.HRB600 steel bars were used as longitudinal bars of seven of the nine columns,while HRB400 steel bars were used for the other two columns.The influence of design parameters such as the strength of steel bars,concrete strength,volume ratio of stirrups and load eccentricity on the eccentric compressive behavior of high-strength concrete columns was discussed.The results show that the failure characteristics,deflection curve and cross-sectional strain distributions of high-strength concrete columns with HRB600 steel bars are basically the same as those of high-strength concrete column with HRB400 steel bars.Under the large eccentric compression condition,the compressive bearing capacity of high-strength concrete columns with HRB600 steel bars is 8.55% higher than that of HRB400 steel reinforced concrete columns,and the load decreases gradually after the peak.With the increase of concrete strength grade,volume ratio of stirrups and stirrup strength grade,the compressive bearing capacity of high-strength concrete columns with HRB600 steel bars increases.It is reliable to use the relevant formulae in the current concrete structure design codes to calculate the compression-bending capacity,the average crack spacing and the maximum crack width of high-strength concrete columns with HRB600 steel bars.
引文
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[5]赵少伟,韩松,朱凯. 600 MPa级钢筋混凝土短柱抗震性能研究[J].工业建筑,2017,47(6):1-6.(ZHAO Shaowei,HAN Song,ZHU Kai. Research on seismic behavior of concrete short columns with 600megapascal reinforced bars[J]. Industrial Construction,2017,47(6):1-6.(in Chinese))
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[7]建筑结构荷载规范:GB 50009—2012[S].北京:中国建筑工业出版社,2012.(Load code for design of building structures:GB 50009—2012[S]. Beijing:China Architecture&Building Press,2012.(in Chinese))
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