【摘要】 目的为了达到屈曲约束支撑设计时的安全性和经济性,屈曲约束单元需要同时满足刚度和强度条件.方法采用弹性稳定理论,对带有侧向约束的理想轴心压杆和带有初始变形的屈曲约束支撑进行了分析.结果有侧向约束的理想轴心压杆的弹性屈曲荷载由轴心压杆与侧向约束单元屈曲荷载的和叠加而成.给出了在不同初始变形下进行屈曲约束支撑设计时,屈曲约束单元应该同时满足的刚度条件和强度条件.结论给出的屈曲约束支撑设计的强度和刚度条件的表达式可用以校核屈曲约束支撑设计的合理性.更多还原

【Abstract】 In order to achieve safety and economization in designing a new type of buckling-restrained braces(BRBs),stiffness and strength criteria of the buckling-restraining element should be satisfied simultaneously.Based on the elastic stability theory,overall buckling criterion of BRBs was obtained through the analysis of a steel brace encased by concrete with debonding layer under axial compression.Taking into account the yielding of the axial core braces,both stiffness and strength design criteria for BRBs are given.The elastic buckling capacity of the composite brace can be considered as simply the sum of the contributions of the two separate parts.The stiffness and strength requirements of the buckling-restraining element should be considered as a pair in designing BRBs.Expressions of stiffness and strength design criteria can be used to verify the rationality of the design.更多还原