防屈曲耗能钢支撑设计方法的研究

Study on the design method of buckling-restrained brace

介绍了防屈曲耗能钢支撑的研究和应用现状,结合现有文献和本文作者的防屈曲耗能钢支撑试验研究,分析了其受力性能及其影响参数。依据FEMA450的有关规定和我国规范,建议了防屈曲耗能钢支撑设计计算方法,包括:(1)防屈曲耗能钢支撑的布置设计要求;(2)防屈曲耗能钢支撑保证核心钢支撑强度充分发挥的整体稳定性设计条件;(3)外包约束的抗弯及抗裂设计要求,及其外包约束钢筋混凝土和外包约束钢管混凝土的计算方法;(4)根据试验研究结果,建议了无粘结层、端部间隙和节点连接构造的设计要求及构造措施。最后给出了防屈曲耗能钢支撑的设计流程。

Based on current studies of buckling-restrained braces （BRB） in literatures and the experimental researches done by authors, the influencing parameters on the performance of BRB were studied. According to the FEMA450 and the Chinese design code, the design suggestions for BRB were put forward in this paper, including： （ 1 ） BRB sketch in the structures ; （2） stability requirements of BRB to ensure the strength development of the steel core, （3） flexural strength and splitting tensile strength requirements of the restraining part of BRB, and design method to determine the reinforcement for the restraining RC part or the steel tube for the restraining CFT part; （4） details of BRB, including the unbonded layer, the gap between steel core and restraining part, the connection of BRB to the structures. Finally the design procedures of BRB were presented.