Publication: Performance of steel roof cladding connection for rural houses roofing system subjected to uplift loading
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Date
2020-05-01
Authors
Azuan, Mohd Khairul
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Abstract
The study of the performance of steel roof cladding to purlin connection for rural houses under wind load becomes the focus of the present study. Post-windstorm survey conducted on damaged rural houses showed that the roof cladding was vulnerable to strong wind. However, previous studies are limited to the engineered building rather than non-engineered building. Mostly, the rural houses are non-engineered buildings and used the umbrella head nail as a fastener rather than screwed fastener. The experimental work using an in-house fabricated airbox was performed to investigate the pull through strength of the steel roof cladding. The numerical study using ANSYS Static Structural was performed to study steel roof cladding enhancement by an additional strip. The fastener reaction force was enhanced with respect to the increase in the cladding thickness between 102% and 137% for the trapezoidal profile and 48% for the corrugated profile. The use of an umbrella head nail connection also improved the pull through strength compared to the self-drilling screw by 22% and 35% for the trapezoidal and corrugated profile, respectively. Besides that, the trapezoidal profile recorded 11% higher of the fastener reaction force compared to the corrugated profile. On the contrary, a relatively small increase in terms of span length showed insignificant enhancement in the pull through strength. The comparison of global and local deformation shape for both FE models predicted a similar deformed shape with the experimental work. The presence of an additional strip with different width strongly improved the maximum deflection of the FE model. For the trapezoidal model, the presence of the 100 mm and 150 mm width of the additional strip decreased approximately between 7.5% and 9.5% of the maximum deflection. Meanwhile, for the corrugated model, the maximum deflection decreased approximately 35% up to 70% with the presence of the 100 mm and 150 mm width of the additional strip. However, the effect of additional strip thickness insignificantly affects the maximum deflection where the difference was calculated between 0.9% and 0.32% for both trapezoidal and corrugated profile, respectively.