Numerical Evaluation of Low Slope Roofs for Wind Uplift PDF Download
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Author: Javad Borujerdi
Publisher:
ISBN:
Category : Flat roofs
Languages : en
Pages : 238
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Book Description
Author: Javad Borujerdi
Publisher:
ISBN:
Category : Flat roofs
Languages : en
Pages : 238
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Book Description
Author: S. M. Zahrai
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Book Description
Author: Nima Dayani
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Maha Dabas
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages :
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Book Description
Wind-induced damages on low-slope roofs are a major and common problem that many buildings located in high wind areas suffer from. Most of these damages are initiated when the metal roof edge fails first, leading to overall roof failure. This is because peak wind pressures occur at the edges and corners of low-slope roof buildings. Currently, there are not enough wind design guidelines for the Canadian roofing community to quantify the dynamic wind uplift resistance of the roof edge system. The objective of this research is to evaluate the effect of wind-induced loads on roof edges using a finite element model, verify the numerical results with those obtained from controlled experiments, and perform parametric investigations for various design variables. In this research, the overall roof edge system was modelled using the commercial finite element software package ABAQUS, by simulating the roof edge system with shell elements and applying a uniform static pressure against the face of the edge cleat or coping. Results of the modelling were compared to the experimental ones in terms of deflection of the coping under uniform pressure. The results of the numerical model and the experiments show a good agreement. Furthermore, a parametric analysis of the system was conducted under the effect of varying parameters. i.e., coping gauge, nail spacing, coping and cleat length and wind and thermal load application.
Author: Bona Murty
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages : 580
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Book Description
Author: C. W. Griffin
Publisher: McGraw Hill Professional
ISBN: 0071486909
Category : Technology & Engineering
Languages : en
Pages : 619
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Book Description
For decades, this manual has been the most widely respected guide to designing, constructing, and maintaining low-slope roofing systems.
Author: Bas A. Baskaran
Publisher:
ISBN:
Category : Adhesive
Languages : en
Pages : 15
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Book Description
A new generation of built-up roofs, known as Adhesive Applied Roofing Systems (AARS), is gaining popularity in North America for low slope application. AARS use no fasteners for components' attachment and all components (e.g., insulation board, cover board, and membranes) are integrated by application of adhesives. Since there are no metal fasteners, AARS can offer advantages of reduction in moisture migration and thermal bridging. Moisture in the roof envelope can lead generally to material deterioration, structural integrity problems, and the growth of mould. Even though AARS are in commercial use, there is no existing test standard to quantify their wind uplift performance. A new project, "Development of Wind Uplift Standard for Adhesive Applied Low Slope Roofing Systems," has been initiated in collaboration with industries, university, and the Canadian Government. The project has three major tasks: experimental investigation, formulation of a numerical model, and development of wind design guide and standard. Task 1 completes preliminary investigations by constructing eight mock-ups. All mock-ups had steel deck and polyisocyanurate insulation and varied in adhesives (type, quantity, and application method), cover boards, and membranes. Mock-ups were subjected to both static and dynamic wind loading conditions. Experimental data showed similarity in failure modes and variations in wind uplift ratings. Data show that among the mockups, the weakest link varied depending on the type of adhesives used and component arrangements. This paper presents and discusses the data from this ongoing experimental investigation.
Author: Sudhakar Molleti
Publisher:
ISBN:
Category : Roofing
Languages : en
Pages : 420
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Book Description
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: Roberto Capozucca
Publisher: Springer Nature
ISBN: 3031240413
Category : Technology & Engineering
Languages : en
Pages : 324
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Book Description
This volume provides the latest developments in the field of steel and composite for engineering applications, as presented at the International Conference on Steel and Composite for Engineering Structures (ICSCES), held in Ancona, Italy on September 12-13, 2022. It covers interest topics like control and vibration, damage in composite materials, fracture and damage mechanics, construction management, damage tolerance, safety, security, and reliability, big data analytics, topology optimization and artificial intelligence, mechanical and material engineering, structural health monitoring, computer-aided design and manufacturing, crack initiation and propagation, performance and optimization, computational fracture mechanics, inverse problem, non-destructive testing, signal processing, artificial intelligence. It serves as a reference work for professionals and students in the areas of civil engineering, applied natural sciences and engineering management.
