【摘要】 为了研究端部加强型双重钢管防屈曲支撑的力学性能,检验间隙及约束比变化对支撑性能的影响,设计并制作了6个防屈曲支撑试件,通过低周循环加载静力试验,研究了力-位移滞回曲线、恢复力模型、割线刚度变化规律、粘滞等效阻尼比、耗能系数等滞回性能,并比较研究了间隙及约束比变化对防屈曲支撑性能的影响。研究表明:端部加强型双重钢管防屈曲支撑性能稳定,延性较高,具有良好的耗能性能和抗低周疲劳特性,其恢复力特性可以采用双线性模型进行描述;间隙应控制在合理的范围内,大于2mm或为0mm时均不利于内核钢管材料强度的发挥,影响支撑的耗能及延性;随着约束比的增大,耗能能力增强,但增加的幅度变小,在满足约束比限值情况下,约束比的变化对支撑的性能不产生明显的影响。更多还原

【Abstract】 To study the mechanical behaviour of the end enhanced double-steel tube buckling-restrained brace(BRB),and test the impact of gap and constraints ratio changes on the performance of BRB,six buckling-restrained brace specimens were designed and produced,and the tension-compression cyclic loading hysteretic performance test of the specimens was conducted,the force-displacement hysteretic curve,restoring force model,variation vegularity of secant stiffness,viscous equivalent damping ratio,energy dissipation factor,etc were researched.And a comparative study on the change of the gaps and constraints ratio on the BRB performance was carried out.Studies show that the BRB displays stable behavior and higher ductility and possess excellent energy dissipation performance and resistance to low cycle fatigue.The restoring force behavior of BRB can be described by use of the bilinear model.Gap should be controlled within a reasonable range.When the gap is greater than 2mm or equal to 0mm the energy dissipation and ductility of BRB will be reduced.With increase of the constraint ratio,the energy dissipation capacity increases,but the increase rate becomes smaller.When the constraint ratio is within certain limits,the changes of constraint ratio do not bring about significant impact on the performance of BRB.更多还原