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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。
In order to study the axial compressive mechanical behavior of high strength concrete confined with high strength stirrups, the axial compression tests of nine high strength concrete columns are carried out. The damage process, failure mode, stress-strain curve and strength of high strength steel are studied Studied and analyzed the influence of such parameters as stirrups diameter, stirrup spacing, stirrups strength and volumetric stirrup ratio on their performances. The results show that, compared with normal strength stirrups, the high strength stirrups have a stronger effect on the improvement of peak stress and peak strain and the ductility of the restrained concrete. The larger the volumetric stirrup rate is, the stronger the confinement effect of stirrups is. When the volume When the stirrup ratio is the same, the restraining effect of the small diameter and small spacing reinforcement is greater than the restraining effect of the large diameter and large spacing reinforcement. When the restraining concrete reaches the peak stress, the stress of the high strength stirrup and the high strength longitudinal reinforcement and the constraint of the stirrup on the concrete The stronger the restraint effect is, the higher the strength of the high-strength stirrups and the high-strength tendons is. When the restraining effect is strong, the high-strength stirrup and the high-strength stirrup can yield when the confined concrete reaches the peak stress. Combined with the test results, the calculation formulas of peak stress and peak strain of high strength concrete confined by high strength stirrups are proposed.