Behaviour of Corrugated Steel Roof Cladding Under Combined Wind Uplift and Racking PDF Download
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Author: Mahadeva Mahendran
Publisher:
ISBN: 9780868568669
Category : Roofs
Languages : en
Pages : 25
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Book Description
Author: Mahadeva Mahendran
Publisher:
ISBN: 9780868568669
Category : Roofs
Languages : en
Pages : 25
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Book Description
Author: You Lin Xu
Publisher:
ISBN: 9780864434562
Category : Building, Stormproof
Languages : en
Pages : 54
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Book Description
A series of static tests was performed on three types of light gauge steel roofing sheets to investigate effects of sheeting profiles on roofing structural behaviour under simulated wind uplift. The considered sheeting profiles were arc-tangent, trapezoidal and ribbed, and an alternate (or equivalent alternate) sheeting crest fastening system was adopted. Different roofing spans and sheeting thicknesses were included in the tests, and the effect of cyclone washers on static performance of the roofing sheets was estimated. The experimental results show that the roof sheeting behaviour under wind uplift was greatly dependent on the sheeting profiles. The shape and height of screw fastened crests affected limit values of initial failure or ultimate strength of the roofing sheets. The use of cyclone washers reduced local plastic deformation around the screw fasteners at the central support and, in general, increased the slope of load-deflection curves and failure strength. Increasing of roofing span slightly reduced the limit values of reaction force per fastener, but the allowable wind pressure still should be decreased. The use of thicker roofing sheets enhanced the roofing static failure strength and sometimes changed the roofing failure modes. The midspan load method which has been used in roof sheeting tests was also examined in this project. The measured load-fastener reaction force curves showed that two-span continuous simply supported beam assumption was reasonable in most cases. However, during large cross-sectional distortion or large local plastic deformation, such assumption was not satisfactory. The experimental results obtained by using two types of midspan loading pads indicated that the effect of loading pad surface on initial failure strength of the roofing sheets was considerable.
Author: Mahadeva Mahendran
Publisher:
ISBN: 9780864433978
Category : Roofing, Iron and steel
Languages : en
Pages : 23
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Book Description
Currently two different fatigue tests, the DABM test and the TR440 test, are being used in the cyclone prone areas to assess the fatigue susceptibility of roof claddings. This is because the recent TR440 test has not been accepted in the Northern Territory. In order to remedy this unacceptable situation, an extensive research programme was carried out at James Cook University to review the adequacy of these standard fatigue tests. This research programme involved wind tunnel investigations to develop a fatigue wind loading spectrum representing a design cyclone, and structural testing of roof claddings to simulated cyclonic wind forces and standard fatigue test loadings. The design cyclonic wind loading developed in the form of a matrix of number of wind loading cycles for various load levels was applied to roof claddings by a random block load testing method using a servo-controlled hydraulic testing machine in the structures laboratory. Two major groups of roofing profiles, namely the corrugated roofing and the trapezoidal roofing, were included in the investigation. Same roof claddings were also subjected to the standard TR440 test. This report describes the fatigue behaviour of roof claddings when they were subjected to the random block loading tests and the TR440 tests. A few excursions of loading during the random block load test was found to cause significant fatigue damage on corrugated roofing, but caused the reverse effect on trapezoidal roofing. The observation on corrugated roofing was attributed to the dimpling of crests at the fastener holes due to the few excursions of loading. The contrasting behaviour of trapezoidal roofing was due to the membrane action at the crests. Details on the contrasting behaviour, and all the test results are presented in the report. Comparison of the fatigue performance of roof cladding under random block load tests and TR440 tests was used to decide on the adequacy of the latter tests in simulating the cyclonic wind forces. It appeared that the TR440 test is unconservative for corrugated roofing profiles whereas it is conservative for trapezoidal profiles, mainly due to the contrasting behaviour. Fatigue behaviour of these roof claddings appears to be much more complicated than anticipated. Thus the task of assessing the adequacy of the standard fatigue tests or if necessary, developing a new fatigue test for all the cyclone prone areas, has become complicated. This report discusses the implications of this to the building industry, and suggests interim recommendations to resolve the current conflict over the duplicative fatigue testing.
Author: Mahadeva Mahendran
Publisher:
ISBN: 9780868568652
Category : Roofs
Languages : en
Pages : 33
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Book Description
Author: A. Ceccotti
Publisher:
ISBN:
Category : Building, Wooden
Languages : en
Pages : 446
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Book Description
Author: American Society of Civil Engineers
Publisher: Amer Society of Civil Engineers
ISBN: 9780784404881
Category : Technology & Engineering
Languages : en
Pages : 352
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Book Description
Author:
Publisher:
ISBN: 9781859422144
Category :
Languages : en
Pages : 182
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Book Description
Author: Robert Scharff
Publisher: McGraw Hill Professional
ISBN: 9780071360586
Category : Juvenile Nonfiction
Languages : en
Pages : 570
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Book Description
CD-ROM contains: Directory of Internet resources.
Author: Alphose Zingoni
Publisher: CRC Press
ISBN: 1315850788
Category : Science
Languages : en
Pages : 960
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Book Description
Research and Applications in Structural Engineering, Mechanics and Computation contains the Proceedings of the Fifth International Conference on Structural Engineering, Mechanics and Computation (SEMC 2013, Cape Town, South Africa, 2-4 September 2013). Over 420 papers are featured. Many topics are covered, but the contributions may be seen to fall
Author: P. R. Salter
Publisher:
ISBN: 9781859420874
Category : Steel, Structural
Languages : en
Pages : 161
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Book Description
