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Số người truy cập: 75,104,053

 REVIEW ON DAMAGE INVESTIGATIONS AND SOLUTIONS FOR STRENGTHENING THIN STEEL ROOF SYSTEMS DURING EXTREME WIND EVENTS IN AUSTRALIA
Tác giả hoặc Nhóm tác giả: Phan Dinh Hao
Nơi đăng: Tuyển Tập Công Trình - Hội nghị Cơ học Kỹ thuật Toàn quốc 2015; Số: ISBN: 978-604-84-1272-2 TẬP 1;Từ->đến trang: 334-343;Năm: 2015
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Trong nước
TÓM TẮT
The damages to low-rise buildings, especially thin steel roof systems, were really serious after huge cyclones passing the Northern Australian regions. This paper presents damage investigations of the low-rise buildings’ steel roofs and some reasonable solutions used for strengthening these thin steel roof structures. The local premature failures of steel roof systems usually occur during tropical cyclones with strong wind forces and variable wind directions. The detail investigations through many cyclones occurred in Australia indicate that local failures on the thin steel roofs such as dimpling of crests, pull-out and pull-through failures of screw fasteners at sheet-batten connections and batten-truss connections, were main reasons leading to the damages of part or the whole steel roof system. Hence, the strengthening solutions used for above connections would be really necessary. In which, the failed sheet-batten connections have been strengthened effectively with technical solutions, for instance, using cyclone washers and composite metal roof assemblies. In addition, the formulae determining pull-through and pull-out capacities of the screwed sheet-batten connections in tension were proposed in AS/NZS 4600. However, the failed batten-truss connections were not fully investigated and this problem is being investigated further at QUT. Due to the similar climate conditions and recently most of steel sheet and batten products used in Vietnam coming from Australia, so this study has a significant meaning on improving the safety for thin steel roof structures constructed in Vietnam.
ABSTRACT
The damages to low-rise buildings, especially thin steel roof systems, were really serious after huge cyclones passing the Northern Australian regions. This paper presents damage investigations of the low-rise buildings’ steel roofs and some reasonable solutions used for strengthening these thin steel roof structures. The local premature failures of steel roof systems usually occur during tropical cyclones with strong wind forces and variable wind directions. The detail investigations through many cyclones occurred in Australia indicate that local failures on the thin steel roofs such as dimpling of crests, pull-out and pull-through failures of screw fasteners at sheet-batten connections and batten-truss connections, were main reasons leading to the damages of part or the whole steel roof system. Hence, the strengthening solutions used for above connections would be really necessary. In which, the failed sheet-batten connections have been strengthened effectively with technical solutions, for instance, using cyclone washers and composite metal roof assemblies. In addition, the formulae determining pull-through and pull-out capacities of the screwed sheet-batten connections in tension were proposed in AS/NZS 4600. However, the failed batten-truss connections were not fully investigated and this problem is being investigated further at QUT. Due to the similar climate conditions and recently most of steel sheet and batten products used in Vietnam coming from Australia, so this study has a significant meaning on improving the safety for thin steel roof structures constructed in Vietnam.
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