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| Due to initial local failures in accident events, domino phenomena or even progressive collapse might arise in some vulnerable structures, and consequently, robustness or collapse resistance becomes one important requirement in structural design. Because of its low redundancy, truss roof used in large-scale public buildings is one system different from that of frame and bearing wall, of which plentiful literatures can be achieved. In order to discover its potential risk, progressive collapse analysis is carried out in this paper using sophisticated tool LS-DYNA, and its redistribution mechanism of internal forces, dynamic response and failure modes are investigated. The conceptions of sensitivity element and key element are put forward to identify different responses of members due to initial failures. Finally, a Safety Assessment Method (SAM) based on static linear analysis is proposed to evaluate collapse resistance performance of truss structures. |
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| Keywords:steel truss roof, progressive collapse, safety assessment, sensitive element, key element |
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