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为研究高强箍筋约束高强混凝土柱塑性铰区配箍要求,统计了国内外进行的98个矩形截面和11个圆形截面高强箍筋高强钢筋混凝土柱拟静力试验数据。分析了影响高强箍筋高强混凝土柱延性抗震能力的主要因素为配箍特征值、轴压比、纵筋配筋、混凝土保护层厚度等。在此基础上,通过回归分析分别以2%和3%极限位移角为延性目标,建议了具有85%保证率的高强箍筋高强混凝土柱塑性铰区约束箍筋用量计算公式及配箍构造措施,适用于混凝土轴心抗压强度在40MPa―110MPa之间,箍筋屈服强度在400MPa―800MPa之间,试验轴压比在0―0.6之间的高强箍筋高强混凝土柱。
In order to study the hoop requirement of the plastic hinge zone of high strength concrete confined by high strength stirrups, the statistic data of 98 rectangular cross sections and eleven high strength reinforced concrete columns with circular cross section and high strength stirrups were analyzed. The main factors affecting the ductility and seismic resistance of high-strength concrete columns with high-strength stirrups are analyzed as the characteristic values of the stirrup, the axial compression ratio, the reinforcement of longitudinal reinforcement and the thickness of concrete cover. On the basis of this, regression calculation is carried out with 2% and 3% limit displacement angles respectively as ductility targets. The formulas for calculating the restraining stirrups and the hoop structure measures are proposed for the 85% guaranteed high-strength stirrup reinforced concrete column , Suitable for concrete axial compressive strength between 40MPa-110MPa, stirrup yield strength between 400MPa-800MPa, the test axial compression ratio between 0-0.6 high-strength stirrups high-strength concrete columns.