延性交错桁架体系抗震设计方法探讨

钢交错桁架结构体系1]采用平面桁架体系,抗侧刚度高、自重轻、施工快速、造价低廉、绿色环保。近年来,备受国内外工程界及学术界的关注。该体系用平面桁架体系取代剪力墙,虽然大大节省材料,但腹杆的破坏导致结构突然的坍塌使其延性受到很大限制。基于上述原因,参考国外相关规范,笔者给出了该体系的一种延性设计方法,按照新方法进行设计可明显提高结构延性。

Study on the Seismic Design Method of the Staggered Truss Framing Systerms

In recent years staggered truss steel framing has seen a nationwide renaissance.Staggered trusses provide excellent lateral bracing,light weight,rapid construction,low cost and green environmental protection.For mid-rise buildings,there is little material increase in staggered trusses for resisting lateral loads because the trusses are very efficient as part of lateral load resisting systems.The bearing capacity of sudden change which caused by the yielding of web members provide a poor ductility.Reference in this paper,based on the above reasons,foreign related specification,gives the system a ductility design method.