doi:10.3850/978-981-08-9247-0_rp062-icsas11

ABSTRACT

Finite element modeling and analysis have been designed to study the deep channel purlin with bridging (bridged) under uplift loading and downlift loading. The study of the force deformation behavior of purlin is involved loading acting on purlin with one row bridging and with two row bridging. There are five sections being modeled in this study which are C20015, C25024, C25019, C30024 and C35030. The shallower section of C20015 is first modeled to validate all the modeling parameters to model C35030. It is compared to the Vacuum Rig-Test conducted at the Centre for Advance Structural Engineering within the University of Sydney. The capacity of shallower purlin does not increase by the presence of bridging but results in reducing the lateral deformation of the purlin. However the deeper purlin results differently where the purlin capacity is significantly increased by 22% as the bridging is introduced. This happens when the purlin is under uplift loading only. Under downlift loading, the critical load is increased by the presenting of bridging for all section of purlin in this study. It is also found that when the purlin is under downlift loading, bridging is acts as tension member and the maximum bridging tension force is 6.375 kN for C35030 purlin. The 7 m span purlin with bridging at mid span is effective to reduce lateral torsional buckling where the lateral displacement is significantly reduced by 91% under downlift loading.

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