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通过对各国规范中柱子箍筋加密区的构造对比,发现中国规范与国外规范在配箍特征值的取值上有较大差别。此外,在钢筋混凝土柱中采用更高强度的HRB500钢筋后,按照GB 50010—2010《混凝土结构设计规范》设计的柱子其抗震性能是否能达到要求也需进行验证。通过对9根配置HRB500纵筋柱进行低周反复荷载试验,分析配箍率、配箍特征值、箍筋强度以及配箍形式等因素对柱的破坏状态、P-Δ滞回曲线、延性、刚度退化以及耗能能力的影响;对比分析条件基本相同情况下配置HRB500纵筋柱与配置HRB335纵筋柱受力性能的差异。研究结果表明,当柱端箍筋加密区的构造满足要求时,配置HRB500纵筋柱能够满足抗震结构对柱的变形能力以及位移延性的要求。
Through the comparisons of the structural comparisons of columns and stirrups in the national codes, it is found that there is a big difference between the Chinese norms and the foreign codes in the values of the ferrules. In addition, the reinforced concrete columns using more high-strength HRB500 rebar, according to GB 50010-2010 “Design Code for Concrete Structure Design” of the column whether its seismic performance can meet the requirements also need to be verified. Through the low-cycle repeated loading test of 9 HRB500 longitudinal reinforcement columns, the failure state of column, P-Δ hysteresis curve, ductility, Stiffness degradation and energy dissipation. The difference of mechanical performance between HRB500 longitudinal reinforcement and HRB335 longitudinal reinforcement under the same conditions of comparison and analysis is basically the same. The results show that the configuration of HRB500 longitudinal stiffener can meet the requirements of the seismic deformation resistance and displacement ductility of the column when the configuration of the confining area of the end stirrups satisfies the requirements.