Structural behaviour of metal roofs in building structures under static wind loads

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Structural behaviour of metal roofs in building structures under static wind loads

 

Author: Jin, Dan
Title: Structural behaviour of metal roofs in building structures under static wind loads
Degree: M.Sc.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations.
Buildings.
Structural design.
Structural analysis (Engineering)
Roofs -- Design and construction.
Department: Dept. of Civil and Structural Engineering
Pages: x, 105 leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2329748
URI: http://theses.lib.polyu.edu.hk/handle/200/4135
Abstract: This dissertation presents a study on the structural behaviour of metal sheetings and the study includes three parts: Part I is to review existing standards of testing metal roofs. Part II is to study the structral behavior of practical metal roofs through a series of wind suction tests. Part III is to compile a practical design procedure for metal roofing systems. In Part I, the review covers the following: i) Standard Test Method for Structural Performance of Sheet Metal Roof and Siding Systems by Uniform Static Air Pressure Difference (ASTM E 1592), ii) Underwriters Lab (UL 580) procedures, iii) Roof Coverings: Wind Load Resistance (NT BUILD 307), and iv) Standard Test Method for the Dynamic Wind Uplift Resistance of Mechanically Attached Membrane-roofing systems (A 123.21-04). In general, all roofs experience winds of varying speeds during their life span. Wind fluctuations cause the sheetings to flutter, or rapidly flap up and down. The dynamic loadings induced by the fluttering can cause local damages to the sheetings, the fasteners, the substrate on to which the sheetings are fastened, or the fasteners to deck engagement locations. Thus, in all the test methods, the effects of dynamic loading are considered in a realistic manner. In Part II, a series of wind suction tests are performed to obtain moment capacities of metal sheetings when subjected to static wind suction in both upright and inverted positions. Moreover, attachment tests are also carried out to determine the attachment resistances to the metal sheetings for practical design. Though only four tests are performed in each testing position, the results provided a high level of confidence as the results of these four tests are found to be comparable in terms of observed failure modes and pressure-deflection relationships. All the test specimens fail at the lapped connections in both upright and inverted positions. In Part III, a practical design procedure is proposed, and load span tables of typical metal sheetings are compiled and tabulated for practical use. It is found that the hogging moment capacities of the metal sheetings often control the roof design under wind uplift when the clear span of the metal sheetings is large. Six typical metal sheetings are analyzed to provide effective section properties as well as the attachment resistances for practical design. Owing to the large spacings of the attachments in the metal shettings, pull-out failure of the attachments from the metal sheetings is always critical in multi-span metal roofs under consideration. It is envisaged that the information provided in this dissertation will facilitate advances in the design and construction of modern roofs in building structures in Hong Kong.

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