Session Start Date

11-6-2014

Session End Date

11-6-2014

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

Publication Date

11-6-2014

Document Version

Final Version

Rights

© 2014 Missouri University of Science and Technology, All rights reserved.

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).

Document Type

Article - Conference proceedings

File Type

text

Language

English

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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.