Research on reduction factor in the defor mation for mula of cold-for med steel beam

Abstract：The purlin-beam system with cold-formed steel members are more commonly utilized in the construction of low-rise buildings.Because the effect of size, location, type of the inflition load, long-span and bending rigidty, it is difficult to predict the distortion capacity of purlin-beam.The distortion capacity of beam used in the study is not well understood and the related design rules are not available.The deformation capacity behavior of a total of thirteen Q235 cold-formed lipped channel simple beams under bending has been studied in this paper.The results indicated that:according to the north America specification, the deformation analysis under effective cross-section rigidity calculated by controling the greatest moment was conservative.In China specification, the deformation calculated by gross section (equivalent to analysis equal a cross-section and stiffness beam) appeared unsafety.Therefore, with the parameters' analysis of experimental data, a more reasonable reduction factor in the deformation formula is put forward.

Keyword：cold-formed thin-wall;lipped channel beam;effective cross-section;