高强箍筋约束高强混凝土轴心受压试验研究
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（1 天津大学建筑工程学院，天津 300072；2 天津大学滨海土木工程结构与安全教育部重点实验室，天津 300072）
［摘要］为研究高强箍筋约束高强混凝土的轴心受压力学性能，进行了9个高强钢筋高强混凝土柱轴心受压试验，对其破坏过程、破坏形态、应力-应变曲线和高强钢筋强度发挥程度进行了研究，分析了箍筋直径、箍筋间距、箍筋强度和体积配箍率等参数对其性能的影响。结果表明：与普通强度箍筋相比，高强箍筋对约束混凝土峰值应力、峰值应变的提高和延性性能的改善作用更强；体积配箍率越大，箍筋的约束作用越强，当体积配箍率相同时，小直径、小间距配筋的约束作用大于大直径、大间距配筋的约束作用；约束混凝土达到峰值应力时高强箍筋和高强纵筋的应力与箍筋对混凝土的约束作用强弱有关，约束作用越强，高强箍筋和高强纵筋的强度发挥程度越高，当约束作用很强时，高强箍筋和高强纵筋可以在约束混凝土达到峰值应力时屈服。结合试验结果，提出了高强箍筋约束高强混凝土的峰值应力和峰值应变计算公式。［关键词］高强箍筋; 高强纵筋; 高强混凝土; 应力-应变曲线; 约束混凝土中图分类号：TU375 文献标识码：A 文章编号：1002-848X(2015)12-0007-06
Experimental study on axial compression of highstrength concrete confined by high-strength stirrupDing Hongyan1, 2, Liu Yuan1 , Qiu Shi1(1 School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2 Structure and Safety Laboratory of Civil Engineering, Tianjin University, Tianjin 300072, China)Abstract: In order to study the axial compressive mechanical properties of high-strength concrete confined by high-strength stirrup, nine groups of axial compression tests of high-strength concrete column configured high-strength steel were carried out. The failure process, failure modes, stress-strain curve and intensity degree of high-strength steel were studied and some influence parameters such as diameter, spacing and strength of stirrup and volume stirrup ratio were analyzed. The results show that peak stress, peak strain and ductility of high-strength concrete confined by high-strength stirrup are significantly improved, compared with the same situation confined by common stirrup. The larger the volume stirrup ratio is, the stronger the restriction effect of stirrup is. If the volume stirrup ratio is same, the restriction effect of smaller diameter and spacing is better. When confined concrete reaches peak stress, the stress of high-strength stirrup and high-strength longitudinal reinforcement is related to the confinement degree of the concrete by stirrup. The stronger the restriction effect is, the higher the intensity degree of stirrup and longitudinal reinforcement is. If the restriction effect is enough, high-strength stirrup and longitudinal reinforcement yield when confined concrete reaches peak stress. Combined with the results of the tests, formulas of peak stress and peak strain of high-strength concrete confined by high-strength stirrup were proposed.Keywords: high-strength stirrup; high-strength longitudinal reinforcement; high strength concrete; stress strain curve; confined concrete作者简介：丁红岩，博士，教授，博士生导师，Email：dhy_td@163.com。
