JIANG Xiao-feng, . PROGRESSIVE COLLAPSE ANALYSIS AND MECHANISM STUDY FOR LARGE-SPAN STEEL TRUSS STRUCTURES[J]. Engineering Mechanics, 2010, 27(1): 76-083.
Citation: JIANG Xiao-feng, . PROGRESSIVE COLLAPSE ANALYSIS AND MECHANISM STUDY FOR LARGE-SPAN STEEL TRUSS STRUCTURES[J]. Engineering Mechanics, 2010, 27(1): 76-083.

PROGRESSIVE COLLAPSE ANALYSIS AND MECHANISM STUDY FOR LARGE-SPAN STEEL TRUSS STRUCTURES

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  • Received Date: December 31, 1899
  • Revised Date: December 31, 1899
  • Initial failure of local elements caused by accidental events may become a starting point of progressive collapse. Diferring from moment frames or bearing wall systems, the truss system widely used in public architectures with large-span is of low redundancy in nature. In order to raise its structural robustness, precise analysis and therefore valid design trategy shall be expected. As a case study, a steel truss roof is deeply investigated in this paper by numerical method, and the internal force redistribution after intial failure, dynamic effect and primay failure modes are studied. By post-intinial failure analysis, it is found there are three kinds of redistributary mechanisms for truss structure: rotation pin mechanism, sliding surface mechanism and long column mechanism. The concept of sensitive element and key element is conceived according to simplified mathematic models, which provides a simple measure to evulate the safety performance for such structural system.
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