Session Dates
10 Nov 2016
Abstract
New cold roll formed channel and zed sections for purlins, namely UltraBEAMTM2 and UltraZEDTM2, have been developed by Hadley Industries plc using a combined approach of experimental testing, finite element modelling and optimisation techniques. The new sections have improved strength to weight ratio by increasing the section’s strength by using stiffeners in the section webs. The European standards, Eurocode 3, use a traditional Effective Width Method to determine the strength of a cold formed steel member. However, the design of the new sections UltraBEAMTM2 and UltraZEDTM2 using this method is very complicated in calculating the effective section properties as these sections contain complex folded-in stiffeners. In addition, the incorporation of competing buckling modes such as distortional buckling can be difficult to analyse. To overcome difficulties of using Eurocode 3 or such a standard with the Effective Width Method for the design of these sections, the Direct Strength Method (DSM) is adopted for determining the section strengths. Four-point beam bending tests were carried out to determine the buckling and ultimate bending capacity of the UltraBEAMTM2 and UltraZEDTM2 sections. Results of experimental testing and Finite Element Analysis were initially used as validation for the design using the DSM. The DSM results in terms of in bending moment capacities were then compared with the experimental test results for a broader data in which the UltraBEAMTM2 and UltraZEDTM2 sections had a range of different width-to-thickness ratios. It showed an excellent agreement between test and DSM design values. It is concluded that the DSM is a powerful tool for the design and optimisation of the new cold roll formed channel and zed purlins.
Department(s)
Civil, Architectural and Environmental Engineering
Research Center/Lab(s)
Wei-Wen Yu Center for Cold-Formed Steel Structures
Meeting Name
International Specialty Conference on Cold-Formed Steel Structures 2016
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2016 Missouri University of Science and Technology, All rights reserved.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Nguyen, V. B.; Cartwright, B.; and English, M. A., "Design of New Cold Rolled Purlins by Experimental Testing and Direct Strength Method" (2016). CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018). 3.
https://scholarsmine.mst.edu/isccss/23iccfss/session9/3
Design of New Cold Rolled Purlins by Experimental Testing and Direct Strength Method
New cold roll formed channel and zed sections for purlins, namely UltraBEAMTM2 and UltraZEDTM2, have been developed by Hadley Industries plc using a combined approach of experimental testing, finite element modelling and optimisation techniques. The new sections have improved strength to weight ratio by increasing the section’s strength by using stiffeners in the section webs. The European standards, Eurocode 3, use a traditional Effective Width Method to determine the strength of a cold formed steel member. However, the design of the new sections UltraBEAMTM2 and UltraZEDTM2 using this method is very complicated in calculating the effective section properties as these sections contain complex folded-in stiffeners. In addition, the incorporation of competing buckling modes such as distortional buckling can be difficult to analyse. To overcome difficulties of using Eurocode 3 or such a standard with the Effective Width Method for the design of these sections, the Direct Strength Method (DSM) is adopted for determining the section strengths. Four-point beam bending tests were carried out to determine the buckling and ultimate bending capacity of the UltraBEAMTM2 and UltraZEDTM2 sections. Results of experimental testing and Finite Element Analysis were initially used as validation for the design using the DSM. The DSM results in terms of in bending moment capacities were then compared with the experimental test results for a broader data in which the UltraBEAMTM2 and UltraZEDTM2 sections had a range of different width-to-thickness ratios. It showed an excellent agreement between test and DSM design values. It is concluded that the DSM is a powerful tool for the design and optimisation of the new cold roll formed channel and zed purlins.
