高强箍筋约束高强混凝土柱的最小配箍特征值研究

MINIMUM STIRRUP CHARACTERISTIC VALUES OF HSC COLUMNS CONFINED WITH HIGH-STRENGTH STIRRUPS

结合国内外大量试验数据,通过试验研究和理论分析,建立高强箍筋约束高强混凝土柱的极限位移角、延性系数与轴压比、配箍特征值、保护层面积及纵筋配筋率之间的关系;提出考虑轴压力水平的该类型柱中高强约束箍筋的计算式以及在不同抗震等级下柱端加密区的最小配箍特征值,并与GB 50010—2010《混凝土结构设计规范》、ACI 318-05、CSA A23.3-04及NZS 3101规范进行对比。结果表明,按照本文提出的设计方法计算的配箍率高于GB 50010—2010、ACI 318-05,低于CSA A23.3-04、NZS 3101规范值。

Based on a large number of test results at home and abroad,through theoretical analysis and experimental research,the relationship among the limiting displacement drift,the ductility of HSC columns and axial compression ratio,confining reinforcement characteristic values,the cover area as well as longitudinal reinforcement ratio was set up; the design formula for calculating the confining reinforcement and the minimum confining reinforcement characteristic values of HSC columns at different seismic levels were proposed. By way of comparison,it was indicated that the amount of stirrup ratio calculated by proposed design method was higher than current standards and ACI 318- 05 standards,but lower than CSA A23. 3- 04 and NZS 3101 standards.