Analysis of Conventionally Framed Hip Roofs using Cold-Formed Steel Members


Cold-formed steel is continuing to increase in popularity in the residential construction market and is gaining an increasing market share compared with other construction materials. Conventionally framed hip roof construction uses rafters, ridge members, hip members and ceiling joists but does not include any supplemental interior supports or collar ties between rafters. Conventional framing has traditionally been used in light framed timber structures and more recently in roofs framed with cold-formed steel members. based upon a review of building codes, specifications and standards, it was determined that analysis and design of rafters and hip members for conventional hip roof framing does not typically consider axial forces in rafters or hip members. This paper investigates the behavior of conventionally framed coldformed steel roof framing members using elastic, finite element analysis methods. the roof system as a whole was considered in the analysis, including the contribution of the roof sheathing and ceiling joists. an analysis of members which does not consider any strength contribution from sheathing was conducted and shows that depending on the slope of the roof, axial forces developed in these members can be significant and should not be ignored. Alternatively, when roof sheathing is considered to act in combination with other framing members, the axial forces in the rafter and hip members are reduced and bending moment in the hip members are significantly reduced. This study indicates that conventional roof framing behavior can be predicted more accurately by considering the entire roof system, including sheathing, rather than as individual members.


Civil, Architectural and Environmental Engineering

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Article - Conference proceedings

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Publication Date

01 Dec 2006

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