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Abstract
This paper is part of the Journal of Structural Engineering, volume 121, March 1995 printed by ASCE. When subjected to strong fluctuating wind uplift, screw-fastened light-gauge-steel profield roofing sheets may fail locally in the vicinity of fasteners by cracking due to fatigure, resulting in the sheeting being pulled free of the fastener. A series of fatigue tests was performed on three types fo commonly used profiled roofing sheets to investigate their fatigue performance and profile effects under both constant-amplitude repeated loads and simulated uplifting wind loads. The sheeting profiles considered were arctangent, trapezoidal, and ribbed, and an alternate (or equivalent alternate) sheeting crest-fastening system was adopted. It was found that the fatigue performance of roofing sheets greatly depends on their profiles. The fatigur resistance of the arctangent type of sheeting to low-amplitude repeaed loads was found to be higher than those of the other two types of roofing sheets. However, the situation is reversed under high amplitude repeated loads. The liner and bilinear S-N curves on a log-log plot were used, respectively, to fit the experimental data, and the Goodman method was employed to approximately account for the effect of mean load. Load-sequence effects and the application of Miner's rule to the fatigue-lift prediction of screw-fastened profield roofing sheets under simulated wind loads were also investigated.
This paper is part of the Journal of Structural Engineering, volume 121, March 1995 printed by ASCE. When subjected to strong fluctuating wind uplift, screw-fastened light-gauge-steel profield roofing sheets may fail locally in the vicinity of fasteners by cracking due to fatigure, resulting in the sheeting being pulled free of the fastener. A series of fatigue tests was performed on three types fo commonly used profiled roofing sheets to investigate their fatigue performance and profile effects under both constant-amplitude repeated loads and simulated uplifting wind loads. The sheeting profiles considered were arctangent, trapezoidal, and ribbed, and an alternate (or equivalent alternate) sheeting crest-fastening system was adopted. It was found that the fatigue performance of roofing sheets greatly depends on their profiles. The fatigur resistance of the arctangent type of sheeting to low-amplitude repeaed loads was found to be higher than those of the other two types of roofing sheets. However, the situation is reversed under high amplitude repeated loads. The liner and bilinear S-N curves on a log-log plot were used, respectively, to fit the experimental data, and the Goodman method was employed to approximately account for the effect of mean load. Load-sequence effects and the application of Miner's rule to the fatigue-lift prediction of screw-fastened profield roofing sheets under simulated wind loads were also investigated.
Date
3/1995
3/1995
Author(s)
Y Xu
Y Xu
Page(s)
389-398
389-398
Keyword(s)
fatigue performance; metal roofing; steel; fastening; screw
fatigue performance; metal roofing; steel; fastening; screw