摘要
本文对比分析了6组配置普通强度箍筋与配置高强度箍筋的混凝土柱的轴心受压性能,考察了箍筋屈服强度(400 MPa和1100 MPa)、体积配箍率(1.07%~3.62%)、箍筋形式(复合螺旋箍和单螺旋箍试件)和箍筋间距(35mm^45 mm)对混凝土轴心受压性能的影响。结果表明,体积配箍率增加,轴心受压条件下约束混凝土柱的极限承载力和延性都呈现提高的特征,建议体积配箍率应高于1.5%;相较于约束混凝土强度,延性性能受箍筋屈服强度的影响更大;箍筋间距越小,则体积配箍率越高,纵筋越不易屈曲,约束混凝土的延性性能越好。
In order to improve the axial compression performance of high-strength concrete columns confined by high-strength stirrups,the axial compression performance of six groups of concrete columns with ordinary stirrups and high-strength stirrups were compared and analyzed,including stirrup yield strength(400 MPa and 1100 MPa),volume stirrup ratio(1.07%~3.62%),stirrup form(composite spiral hoop and single spiral hoop test piece)and stirrup spacing(35 mm and45 mm)on the behavior of concrete under axial compression.The results show that the volume stirrup ratio increases from1.07%to 3.62%,and the ultimate bearing capacity and ductility of confined concrete columns are improved under axial compression.It is suggested that the volume stirrup ratio should be higher than 1.5%;the effect of stirrup yield strength on the ductility of confined concrete is greater than its effect on strength,and the high-strength stirrup cannot yield when the specimen with poor restraint reaches the peak strength,and the stirrup cannot yield The stress is only about 40%of its yield strength;the smaller the stirrup spacing is,the higher the volume stirrup ratio is,the more difficult the longitudinal reinforcement is to buckle,and the better the ductility of confined concrete is.
作者
张毅鹏
ZHANG Yi-peng(School of Architectural Engineering/Sanmenxia Polytechnic,Sanmenxia 472000,China)
出处
《山东农业大学学报（自然科学版）》
北大核心
2020年第6期1106-1108,1131,共4页
Journal of Shandong Agricultural University：Natural Science Edition
关键词
箍筋混凝土
箍筋特性
轴心受压性能
Stirrup concrete
stirrup properties
axial compression performance
