In view of a collapse accident of the roof-fram, the strength and the stability of a collapsed roof-fram is analysed in detail.

本文针对一起屋架坍塌事故，详尽分析了坍塌屋架的强度及稳定性。

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The pillars gave way and a section of the roof collapsed.

这些立柱坍塌了，一部分屋顶坠落下来。

《牛津词典》

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Stallholders have held their first market since a shopping centre was shut because part of its roof collapsed.

BBC: Langney roof collapse

The roof collapsed in several parts of the building, trapping many inside, said Fernandes, the reporter from Band News.

CNN: Fire rips through crowded Brazil nightclub, killing 233

Mr Gibson and a colleague, Phil Sheldon, were trapped after the roof collapsed 2, 600 ft (800m) underground on 27 September.

BBC: Pit death inquest: Gerry Gibson died from asphyxiation