Contrasting Behaviour of Steel Roof Claddings Under Simulated Cyclonic Wind Forces PDF Download
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Author: Mahadeva Mahendran
Publisher:
ISBN: 9780868568706
Category : Roofing, Iron and steel
Languages : en
Pages : 21
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Book Description
Author: Mahadeva Mahendran
Publisher:
ISBN: 9780868568706
Category : Roofing, Iron and steel
Languages : en
Pages : 21
Get Book Here
Book Description
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: 9780868568553
Category : Roofing, Iron and steel
Languages : en
Pages : 24
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Book Description
Author: M. Mahendran
Publisher:
ISBN:
Category : Climatology
Languages : en
Pages : 7
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Book Description
During an investigation on thin steel roof claddings under simulated cyclonic wind loading, it was found that trapezoidal roof claddings behaved quite differently to corrugated (arc and tangent type) roof claddings due to the presence of overload cycles. The overload cycles caused a reduction in fatigue life for corrugated roofing whereas the reverse occurred for trapezoidal roofing. This contrasting behavior of the two crest-fixed roof claddings was investigated using small scale roofing models instead of the commonly used large scale two-span roof claddings. It was found that overload cycles formed a weaker locally dimpled mechanism around the fastener holes of corrugated roofing and thus accelerated the fatigue-caused pull-through failure. In contrast, a stronger deformed shape was formed in trapezoidal roofing which delayed the pull-through failure. Both laboratory testing and finite element analysis of small scale models were used to study the contrasting behavior of roof claddings.
Author: Mahadeva Mahendran
Publisher:
ISBN: 9780864433961
Category : Roofing
Languages : en
Pages : 27
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Book Description
Extensive damage to light gauge metal roof claddings during cyclone Tracy led to the introduction of fatigue testing of roof claddings. Currently two different fatigue tests, the DABM test (1976) and the TR440 test (1978), are being used in the cyclone prone areas because the Northern Territory has continued to require the DABM test even after the introduction of TR440 test. This is an unacceptable situation, and thus 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 under 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. This experimental simulation of cyclonic wind forces was carried out using a servo-controlled hydraulic testing machine in the structures laboratory. A computer fed with the random block loading data controlled the tests. The required results on the design cyclonic wind forces derived from the wind tunnel investigation are presented first in this report, which then describes how the design cyclonic wind forces were simulated on roof claddings using the random block load testing method. The report also describes the suitability of this method for experimental simulation of cyclonic wind forces on roof claddings.
Author: Mahadeva Mahendran
Publisher:
ISBN: 9780868568669
Category : Roofs
Languages : en
Pages : 25
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Book Description
Author: Mahadeva Mahendran
Publisher:
ISBN: 9780864432964
Category : Sheet-metal, Corrugated
Languages : en
Pages : 122
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Book Description
Author: Moses Austin
Publisher:
ISBN:
Category : Texas
Languages : es
Pages : 1204
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Book Description
Author: Christoper Day
Publisher: Routledge
ISBN: 1136409203
Category : Architecture
Languages : en
Pages : 354
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Book Description
Ecohouse is an exciting and timely text that tells you how to design low energy, environmentally friendly buildings today. It also provides the foundations for building design in a warming world, and stepping stones towards the zero-carbon emission buildings of tomorrow. Sue Roaf is famed for her approach to design and her awareness of energy efficiency. Here she reveals the concepts, structures and techniques that lie behind the realization of her ideals. By using her own house as a case-study Roaf guides the reader through the ideas for energy efficient design or 'eco design'. This guide to the ecohouse also explores 21 case-studies from around the world, from Norway and Sweden to India and Japan, Argentina and Mexico. Chapters by Christopher Day, Katerine Bohn and Andre Viljoen on ecological building materials and methods and a contribution by Robert and Brenda Vale - all experts in this field Ecohouse has a regularly updated companion web site providing further information on all issues relating to Ecohouse and eco design. Log on to www.bh.com/companions/ecohouse for a direct link.
Author: National Association of Steel-Framed Housing Inc
Publisher:
ISBN: 9780992274535
Category : Reference
Languages : en
Pages : 0
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Book Description
