地震作用下,交错桁架钢框架体系(staggered truss steel framing system,STF)存在破坏模式不理想、结构冗余度低、抗震延性较差等问题,在高烈度区的推广应用受到限制.为推动STF的地震损伤控制(seismic damage control)研究,在梳理国内外STF理论分析、试验研究以及有限元分析(finite element analysis,FEA)等研究现状的基础上,总结STF地震损伤控制研究存在的问题,展望可行的创新研究方向,并建议在以下3方面展开进一步研究:通过设置阻尼器或形成混合结构体系,从而引入地震损伤控制机制,可改进STF的地震破坏模式,提高抗震性能;建立评价STF地震损伤控制改进方案的统一有限元基准模型,从而有利于评价各改进方案的有效性,并对比研究其适用范围;完善STF竖向与水平耦合抗力系统的地震鲁棒性研究,建立适用于STF的地震损伤评估方法.
Research status and prospects of seismic damage control of staggered truss steel framing system
Under seismic loads,staggered truss steel framing system(STF)has inherent problems such as unsatisfactory failure modes,low structural redundancy,and poor seismic ductility.In order to promote the research on seismic damage control of STF,this article reviewed the current research status of STF theoretical analysis,experiments and finite element analysis(FEA)around the world,summarized the existing problems in STF seismic damage control research,considered feasible innovative research directions,and recommended further research in the following three aspects.First,introducing seismic damage control to STF by installing dampers or forming a hybrid structural system,which can improve the seismic failure mode of STF and enhance the seismic performance.Second,establishing unified FEA benchmark models for the evaluation of STF seismic damage control improvement schemes,thus facilitating the evaluation of the effectiveness of each improvement scheme and the comparative study of its scope of application.Third,improving the seismic robustness research on the vertical and horizontal coupling resistance system of STF,and establishing a seismic damage assessment method suitable for STF.
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