Collapse-Resisting Mechanisms of Planar Trusses Following Sudden Member Loss
Publication: Journal of Structural Engineering
Volume 143, Issue 9
Abstract
Progressive collapse incidents of truss structures are often reported; however, studies on the collapse resistance of truss structures are comparatively few. In order to investigate the collapse-resisting mechanisms of truss structures, this paper presents a comprehensive and detailed study on the collapse-resisting performance of planar trusses subjected to local damage at various locations, using both finite-element (FE) and analytical approaches. An improved FE analysis procedure is proposed to improve the computational efficiency. The main conclusions include the following: (1) in the case of a sudden loss of a top chord member or a diagonal member, catenary action will be the primary mechanism to provide the bridging-over capacity of the remaining structure, and severer damage can result when the removed member locates in the midspan; and (2) if a bottom chord member is suddenly lost, arch action will be the main mechanism to provide the bridging-over capacity of the remaining structure, and severer damage can result when the removed member locates next to the support or in the midspan.
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Acknowledgments
The work presented in this paper was funded by the National Natural Science Foundation of China (No. 51178332); the Foundation of State Key Laboratory of Disaster Reduction in Civil Engineering (No. sLDRCEO93-03); and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130072110039). Technical input from previous studies conducted by several Ph.D. students in this research group, in particular Xiao-feng Jiang and Lei Wang, is also gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 10, 2016
Accepted: Mar 20, 2017
Published online: Jun 20, 2017
Published in print: Sep 1, 2017
Discussion open until: Nov 20, 2017
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