WANG Yuan,NIE Xiaoning,TIAN Limin.Influence Factors on Progressive‑Collapse Resistance of Large‑span Single‑layer Latticed Domes[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(03):464-471.
WANG Yuan,NIE Xiaoning,TIAN Limin.Influence Factors on Progressive‑Collapse Resistance of Large‑span Single‑layer Latticed Domes[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(03):464-471. DOI: 10.13409/j.cnki.jdpme.202007003.
Influence Factors on Progressive‑Collapse Resistance of Large‑span Single‑layer Latticed Domes
In order to analyze the factors influencing the collapse resistance of large-span single-layer latticed domes, a scaled Kiewitt-6 (K6) dome was tested and the finite element model was verified. On this basis, the effects of force transmission paths and initial imperfections on the progressive collapse resistance of large-span single-layer latticed domes were analyzed. The results indicate that after the two force transmission paths failed, the failure mode of the tested dome was local collapse. The dome relies mainly on the compression mechanism to resist progressive collapse. The finite element analysis results are well validated by the test results. The force transmission paths and initial imperfections have significant effects on the progressive collapse resistance of large-span single-layer latticed domes. When the force transmission path fails successively, the progressive collapse resistance of domes can be fully utilized. When the force transmission path fails at the same time, the dynamic response of the structure increases significantly. As the size of the initial imperfection increases, the progressive collapse resistance of domes decreases. When the size of the initial imperfection is identical, the progressive collapse of domes does not always occur firstly in the first-order buckling mode. It is recommended to consider the influence of the force transmission paths and take the first 10 buckling modes for analyzing the progressive collapse of domes.
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