This chapter considers the analysis and design of cold-formed steel portal frames. A literature review of tests on cold-formed steel joints is first presented. The requirement in beam idealization for cold-formed steel portal frames to take into account both the semirigidity and the finite connection length is shown through comparisons against full-scale test results. In the case of joints formed through the web, a reduced strength as a result of the bimoment in the section is demonstrated. For practical small-sized frames, however, serviceability design is more important, to avoid tearing of the cladding at the gable end frames caused by load returned to the gables as a result of stressed skin. The effect of stressed-skin action for portal frames with small spans is shown. For such frames, a three-dimensional stressed-skin frame analysis should be used for design purposes. Finally, performance in fire conditions is described, suggesting the potential advantages of fire protection to the side rails.
|Title of host publication||Recent Trends in Cold-Formed Steel Construction|
|Publisher||Woodhead Publishing Limited|
|Publication status||Published - 2016|
Lim, J. B. P., Wrzesien, A. M., & Nethercot, D. A. (2016). Sustainable applications of cold-formed steel structures: portal frames. In C. Yu (Ed.), Recent Trends in Cold-Formed Steel Construction (pp. 265-303). Woodhead Publishing Limited. https://doi.org/10.1016/B978-0-08-100160-8.00013-X