Numerical and Experimental Investigations for Wind Uplift Force on Flat Roofing System PDF Download
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Author: Nima Dayani
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Nima Dayani
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Bona Murty
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages : 580
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Author: Javad Borujerdi
Publisher:
ISBN:
Category : Flat roofs
Languages : en
Pages : 238
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Author: Weixian He
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
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Book Description
The integrity of the roof system is essential for ensuring the safety of inhabitants and preventing excessive damage to light-frame wood structures. The uplift capacity of fastened roof panels has been investigated using experimental tests and numerical models, where monotonic uniform static pressures are often applied to the roof panel models. The verification is needed for the adequacy of using static uniformly distributed pressure representing the wind load. Moreover, the uncertainty of nail withdrawal behaviour has not been included in existing numerical models, and the effect due to construction errors has not been addressed rationally. A nonlinear Finite Element model is developed in this study to incorporate the nail withdrawal uncertainty in terms of maximum withdrawal force, initial stiffness, proportional limit, and the displacement at maximum force of the nail withdrawal behaviour. This model is used to investigate the statistical characteristics of the panel uplift capacity. The effect of spatial varying wind load is discussed by using the pressure coefficient obtained from wind tunnel model test at the Boundary Layer Wind Tunnel at the University of Western Ontario. Furthermore, the impact of construction error is investigated, in terms of missing nail effects, with first-hand survey information. The detailed survey was carried out at the IRLBH (The Insurance Research Lab for Better Homes) facility to inspect the quality of construction, specifically for the statistical information of missing nails on roof panels. Finally, the evaluated statistical characterization of panel uplift capacity is used for the reliability analysis of a typical panel considering or ignoring the missing nail effects. Both code specified pressure-gust coefficient from NBCC (2005) and the peak pressure coefficients obtained from wind tunnel test are used. Results suggested that the nonlinear pushover analysis using the proposed nonlinear Finite Element model is adequate for estimating the panel uplift capacity. A more stringent fastening schedule with a spacing of 150 mm for the edges and intermediate supports is suggested for the construction of light frame wood houses.
Author: Giuseppe Carlo Marano
Publisher: Springer Nature
ISBN: 3030803120
Category : Technology & Engineering
Languages : en
Pages : 1127
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This book gathers peer-reviewed contributions presented at the International Conference on Structural Engineering and Construction Management (SECON’21), held on 12-15 May 2021. The meeting served as a fertile platform for discussion, sharing sound knowledge and introducing novel ideas on issues related to sustainable construction and design for the future. The respective contributions address various aspects of numerical modeling and simulation in structural engineering, structural dynamics and earthquake engineering, advanced analysis and design of foundations, BIM, building energy management, and technical project management. Accordingly, the book offers a valuable, up-to-date tool and essential overview of the subject for scientists and practitioners alike, and will inspire further investigations and research.
Author: Maha Dabas
Publisher:
ISBN: 9780494860359
Category :
Languages : en
Pages :
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Author: Jiyuan Tu
Publisher: Butterworth-Heinemann
ISBN: 0080982433
Category : Computers
Languages : en
Pages : 458
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Book Description
An introduction to CFD fundamentals and using commercial CFD software to solve engineering problems, designed for the wide variety of engineering students new to CFD, and for practicing engineers learning CFD for the first time. Combining an appropriate level of mathematical background, worked examples, computer screen shots, and step by step processes, this book walks the reader through modeling and computing, as well as interpreting CFD results. The first book in the field aimed at CFD users rather than developers. New to this edition: A more comprehensive coverage of CFD techniques including discretisation via finite element and spectral element as well as finite difference and finite volume methods and multigrid method. Coverage of different approaches to CFD grid generation in order to closely match how CFD meshing is being used in industry. Additional coverage of high-pressure fluid dynamics and meshless approach to provide a broader overview of the application areas where CFD can be used. 20% new content .
Author: Yongsheng Zhou
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: You Lin Xu
Publisher:
ISBN: 9780864434562
Category : Building, Stormproof
Languages : en
Pages : 54
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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: Sudhakar Molleti
Publisher:
ISBN:
Category : Roofing
Languages : en
Pages : 420
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