Abstract
In light-gauged steel purlin-to-sheeting roof systems, the attached sheeting can provide rotational restraints to the purlin. The magnitude of the additional rotational stiffness offered by the sheeting will affect the load bearing capacity of the purlin. The current design method in Eurocode3 (EC3) is less accurate in predicting the purlin–sheeting rotational stiffness as it neglects the effect of wall thickness of the purlin. An integral model is introduced based on the finite element method. Comparisons are made between numerical results and existing experiments and a good agreement is observed. Parametric studies are conducted based on the validated model to investigate the influences of geometric dimensions on the rotational stiffness. Two modified coefficients are proposed for calculating the rotational stiffness based on the codified formulae in EC3, where the effect of the wall thickness and the flange width of the purlin are both considered.
Highlights
Roof systems with cold-formed steel (CFS) purlins attached to corrugated sheeting are widely used due to its shorter construction time
In order to further consider the interactional effect at screw points and the effect of loading directions, an improved analytical method based on experimental studies was proposed in Zhao et al (2014) to predict the rotational stiffness of cold-formed Z and Σ purlin/sheeting systems
Where CD,A is the rotational stiffness of the connection between the sheeting and the purlin; and CD,C is the rotational stiffness corresponding to the flexural stiffness of the sheeting, which is negligible as the value of CD,C is considered to be much larger than CD,A
Summary
Roof systems with cold-formed steel (CFS) purlins attached to corrugated sheeting are widely used due to its shorter construction time. In order to further consider the interactional effect at screw points and the effect of loading directions, an improved analytical method based on experimental studies was proposed in Zhao et al (2014) to predict the rotational stiffness of cold-formed Z and Σ purlin/sheeting systems As open sections such as channel, zed, angle and sigma section are vulnerable to local and distortional buckling (Li 2009; Ye et al 2002b; Yang and Liu 2012b; Huang and Zhu 2016; Bai et al 2017; Huang et al 2018), the restraining effect provided by sheeting can be used for improving buckling resistance of the CFS purlin. Based on the numerical results, compensation coefficients are proposed to the current EC3 approach to calculating the rotational stiffness of Σ purlin–corrugated sheeting system
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