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为研究在满足一定延性水平下高强箍筋约束柱加密区的最小配箍特征值要求,对比了中国混凝土结构设计规范与欧洲、美国以及新西兰规范关于约束箍筋强度限值、箍筋用量的规定,以及配箍特征值随轴压比变化的趋势。同时,利用国内外247根箍筋屈服强度在400MPa~1200MPa的钢筋混凝土柱的低周反复试验结果,分析了不同配箍特征值、不同轴压比与柱破坏时的延性关系;对比了柱试件延性结果与中国规范对柱加密区最小配箍特征值要求的关系。对比分析结果表明:中国规范柱加密区的箍筋配置要求在较高轴压比和高轴压比作用时偏低,有必要在轴压比较高的条件下适当上调配箍特征值。在此基础上,从满足延性要求的角度,提出了使用高强箍筋约束柱的设计建议。
In order to study the requirements of the minimum bracing characteristic value of the confined column with high strength stirrups confined at a certain ductility level, the design rules of concrete structures in China and those of the European, American and New Zealand norms are compared with those of the confining stirrups and the stirrups , As well as the characteristic value of the ferrule changes with the axial pressure ratio. At the same time, the ductility relationship between eigenvalues and different axial compression ratios of columns with different cuffs was analyzed by using the results of low-cycle tests of 247 stirrup bars with yield strength between 400MPa and 1200MPa at home and abroad. RELATIONSHIP BETWEEN THE DUCTILITY RESULT OF TESTS AND THE REQUIREMENTS OF THE MINIMUM BUCKLE EIGENVALUE OF CHINA REGULATIONS ON THE COLUMN PRECEDING AREA. The results of comparative analysis show that the stirrups configuration requirements of China’s code column encryption zone are low at high axial compression ratio and high axial compression ratio. It is necessary to properly adjust the ferrule characteristic value under the condition of high axial compression ratio. On this basis, from the point of view of meeting the requirements of ductility, the design suggestion of restraining columns with high strength stirrups is proposed.