Structural Modeling and Design Considerations for Double-Layer Shoring Systems
Publication: Journal of Construction Engineering and Management
Volume 130, Issue 3
Abstract
This paper presents structural modeling and design considerations for a double-layer shoring system made of wood posts based on analytical derivation, numerical computation, and the LeMessurier formula. Simplified two-dimensional models of double-layer shoring systems are developed. The analysis shows that system critical loads do not increase with the addition of individual pinned-ended shores, i.e., leaning columns, in the system during construction. If these individual pinned-ended shores are widely used, more cases of falsework failure may occur. The effects of lengths of horizontal stringers and vertical shores, stiffnesses of stringers, and positions of strong shores are investigated in the paper. The reinforcement by addition of bracing to the shoring systems can improve the system buckling strength. The study concludes that appropriately fastening a group of pinned-ended shores with horizontal bracings, i.e., strong shores, can increase the load-carrying capacity of a double-layer shoring system.
Get full access to this article
View all available purchase options and get full access to this article.
References
Chan, S. L., and Zhou, Z. H.(1994). “A pointwise equilibrium polynomial (PEP) element for nonlinear analysis of frame.” J. Struct. Eng., 120(6), 1703–1717.
Council of Labor Affairs. (1997). “Investigations of construction accidents: ” (IOSH86-03), Research Rep., Taipei, Taiwan (in Chinese).
El-Shahhat, A. M., Rosowsky, D. V., and Chen, W. F.(1994). “Construction safety of multistory concrete buildings.” ACI Struct. J., 91(4), 475–485.
LeMessurier, W. J.(1977). “A practical method of second order analysis, Part 2—Rigid frames.” AISC Eng. J., 14(2), 49–67.
Mosallam, K., and Chen, W. F.(1990). “Design considerations for formwork in multistory concrete buildings.” Eng. Struct., 12(7), 163–172.
Peng, J. L.(2002). “Stability analyses and design recommendations for practical shoring systems during construction.” J. Constr. Eng. Manage., 128(6), 536–544.
Peng, J. L., Kung, C. H., and Huang, W. C. (1998). “Load-carrying capacity of double-layer falsework systems.” Structural Engineering Rep., Chaoyang University of Technology, Taichung, Taiwan (in Chinese).
Peng, J. L., Pan, A. D., Rosowsky, D. V., Chen, W. F., Yen, T., and Chan, S. L.(1996a). “High clearance scaffold systems during construction, Part I: Structural modeling and modes of failure.” Eng. Struct., 18(3), 247–257.
Peng, J. L., Rosowsky, D. V., Pan, A. D., Chen, W. F., Chan, S. L., and Yen, T.(1996b). “High clearance scaffold systems during construction, Part II: Structural analysis and development of design guidelines.” Eng. Struct., 18(3), 258–267.
Peng, J. L., Yen, T., Lin, I., Wu, K. L., and Chen, W. F.(1997). “Performance of scaffold frame shoring under pattern loads and load paths.” J. Constr. Eng. Manage., 123(2), 138–145.
Information & Authors
Information
Published In
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jun 5, 2001
Accepted: Dec 16, 2002
Published online: May 14, 2004
Published in print: Jun 2004
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.