大跨度钢结构的抗连续性倒塌设计

为了实现大跨度钢结构的抗连续性倒塌设计目标,从结构体系布置的角度出发,对不同形式的大跨度钢结构,提出抗连续性倒塌设计的实用方法与措施：即对连续多榀平面桁架等平面结构体系,增设横向联系梁;对环向布置的结构体系,增设环形联系梁;对弦支预应力结构,拆分传力路径。关于抗连续性倒塌分析方法,根据不同的体系特点,说明了静力线性法、...

Progressive Collapse Resistance Design of Long Span Steel Structures

In order to ensure the progressive collapse resistance design of long span steel structures, several practical methods or measures are proposed for the structure design in this paper based on the different structure systems. The methods are the lateral beam method for plane truss structure systems, the circular reinforced beam method for radial layout truss structures and the separated load path method for the tension string structures. In the aspect of calculating methods, the suitable scopes of the linear static method, the nonlinear static method and the nonlinear dynamic method are concluded. The computation formulas for the structures with local member failure are derived. The variation coefficient of the stiffness matrix condition number before and after the member failure is proposed to judge the illness of the matrix. Three examples prove the design measures and the calculating methods.