A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
15.07: Second‐order direct analysis of long‐span roof structures
Long span roofs are widely used in stadium, shopping mall, public hall, warehouse, airport and so on as they can provide large internal spaces. It is a challenging task to design a long span roof for the structural engineers using traditional linear design method due to uncertainty in the assumption of effective length. Second‐order direct analysis (SODA) shows many advantages over the traditional linear design approach in terms of structural safety and cost efficiency. In this paper, the design considerations and procedures of using SODA for design of long span roofs are presented. Both the P‐Δ and P‐δ effects as well as initial imperfections have been taken into account. More importantly, this innovative method is used to trace the structural behaviour of long span structures during offload process so that the structures can be safely and progressively deformed to their designed position with minimize lock‐in stress. A nonlinear spring element is proposed to capture the behaviour of the mechanical jack which is the device for implementation of offload process. Thus, a comprehensive solution is introduced here for offload analysis of long span structures. Finally, a practical long‐span single layer roof structure in Macau is used to demonstrate the validity and accuracy of the proposed method.
15.07: Second‐order direct analysis of long‐span roof structures
Long span roofs are widely used in stadium, shopping mall, public hall, warehouse, airport and so on as they can provide large internal spaces. It is a challenging task to design a long span roof for the structural engineers using traditional linear design method due to uncertainty in the assumption of effective length. Second‐order direct analysis (SODA) shows many advantages over the traditional linear design approach in terms of structural safety and cost efficiency. In this paper, the design considerations and procedures of using SODA for design of long span roofs are presented. Both the P‐Δ and P‐δ effects as well as initial imperfections have been taken into account. More importantly, this innovative method is used to trace the structural behaviour of long span structures during offload process so that the structures can be safely and progressively deformed to their designed position with minimize lock‐in stress. A nonlinear spring element is proposed to capture the behaviour of the mechanical jack which is the device for implementation of offload process. Thus, a comprehensive solution is introduced here for offload analysis of long span structures. Finally, a practical long‐span single layer roof structure in Macau is used to demonstrate the validity and accuracy of the proposed method.
15.07: Second‐order direct analysis of long‐span roof structures
Liu, Yao‐Peng (author) / Chan, Siu‐Lai (author) / Du, Zuo‐Lei (author) / He, Jian‐Wei (author)
ce/papers ; 1 ; 3930-3939
2017-09-01
10 pages
Article (Journal)
Electronic Resource
English
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