菱形网格支撑框架结构基于性能的抗震设计方法研究

Performance-based aseismic design method for diamond grid braced frame structure

菱形网格支撑框架结构是一种新型的抗侧力支撑结构,在保证边柱安全的情况下,具有较大的刚度、承载能力以及延性,同时相比传统的支撑体系大大减小了支撑面外厚度,方便钢结构住宅支撑结构与外围护的结合。提出了菱形网格支撑框架结构的抗侧刚度及抗侧承载力公式,同时根据能量守恒的原理,提出了菱形网格支撑框架结构基于性能的抗震设计方法,考虑支撑对框架梁柱的不利影响,通过拟定的屈服机制对屈服构件进行塑性方法设计,对于非屈服构件采用能力设计方法。采用此方法设计了一栋12层的菱形支撑框架结构,通过动力时程分析与传统的交叉支撑框架进行对比,验证了该方法的正确性,为菱形网格支撑框架结构工程设计提供了参考。

Diamond grid braced frame structure is a new type of anti-lateral force support structure.Under the condition of ensuring safety of side columns,it has larger stiffness,load-bearing capacity and ductility.Meanwhile,compared with the traditional support system,it greatly reduces thickness outside the support surface to be convenient for the combination of steel structure housing support structure and peripheral protection.Here,formulas for lateral stiffness and lateral load-bearing capacity of diamond grid supported frame structure were proposed.At the same time,according to the principle of energy conservation,a performance-based aseismic design method for diamond grid supported frame structure was proposed.Considering the adverse impact of support on frame beams and columns,yield members were designed with the plastic method through the proposed yield mechanism.The capacity design method was adopted to design non-yield members.A 12-story diamond grid braced frame structure was designed with the proposed method.The dynamic time history analysis was performed for this structure,and the results were compared with those of the traditional cross braced frame to verify the correctness of the proposed method.It was shown that the study can provide a reference for engineering design of diamond grid braced frame structure.