Session Dates
06 Nov 2014
Abstract
Two full scale specimens were tested to study the flexural capacity of cold-formed steel joists and OSB (Oriented strand board) composite floors. Test results indicated the composite floors had high bearing capacity and small deformation, and the screw spacing significantly affected the load-carrying capacity. The main failure modes were flexural and torsional buckling of floor joist, and the interactive buckling of compression flange, web and crimp. The wave length of bucking equalled to the adjacent screw spacing. Then the specimens were analyzed by commercial software ANSYS and the nonlinear FEM calculation results agreed well with the test results. Furthermore, detailed research on the influence of the screw spacing and the length-width ratio was carried out in order to understand the factors affecting the flexural capacity of the composite floors. FEM analysis results indicated that the reasonable screw center spacing is 150mm at OSB edges and 150~300mm at intermediate supports. Also the load-carrying capacity of the composite floors linearly increased along with the decrease of the joist spacing. Finally, a simplified calculation model and method were proposed on the basis of experimental study and FEM analysis.
Department(s)
Civil, Architectural and Environmental Engineering
Research Center/Lab(s)
Wei-Wen Yu Center for Cold-Formed Steel Structures
Sponsor(s)
National Natural Science Foundation of China
Central University Basic Research Foundation
Meeting Name
22nd International Specialty Conference on Cold-Formed Steel Structures
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2014 Missouri University of Science and Technology, All rights reserved.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Zhou, X. H.; Shi, Y.; Wang, R. C.; and Liu, Y. J., "Study on the Flexural Capacity of Cold-Formed Steel Joists-OSB Composite floors" (2014). CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018). 4.
https://scholarsmine.mst.edu/isccss/22iccfss/session06/4
Study on the Flexural Capacity of Cold-Formed Steel Joists-OSB Composite floors
Two full scale specimens were tested to study the flexural capacity of cold-formed steel joists and OSB (Oriented strand board) composite floors. Test results indicated the composite floors had high bearing capacity and small deformation, and the screw spacing significantly affected the load-carrying capacity. The main failure modes were flexural and torsional buckling of floor joist, and the interactive buckling of compression flange, web and crimp. The wave length of bucking equalled to the adjacent screw spacing. Then the specimens were analyzed by commercial software ANSYS and the nonlinear FEM calculation results agreed well with the test results. Furthermore, detailed research on the influence of the screw spacing and the length-width ratio was carried out in order to understand the factors affecting the flexural capacity of the composite floors. FEM analysis results indicated that the reasonable screw center spacing is 150mm at OSB edges and 150~300mm at intermediate supports. Also the load-carrying capacity of the composite floors linearly increased along with the decrease of the joist spacing. Finally, a simplified calculation model and method were proposed on the basis of experimental study and FEM analysis.
Comments
The authors are grateful for the financial support provided by National Natural Science Foundation of China (No.51108033) and Central University Basic Research Foundation (CHD2013G3286001).