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Wind pressures on flat roof edges and corners of large low buildings

Title:

Wind pressures on flat roof edges and corners of large low buildings

Alrawashdeh, Hatem (2015) Wind pressures on flat roof edges and corners of large low buildings. Masters thesis, Concordia University.

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WIND PRESSURES ON FLAT ROOF EDGES AND CORNERS OF LARGE LOW BUILDINGS.pdf - Accepted Version
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Abstract

The present wind tunnel study examines the suitability of the current wind provisions in wind codes and standards for the design of roof zones of flat-roofed low-rise buildings with large dimensions. Current wind codes and standards have load provisions dealing with low buildings of common configurations. Large buildings, say 100 m long, have not been considered when these provisions were established. As a result, the interaction between wind and buildings of such geometries should be investigated for the assessment of current wind provisions in terms of their applicability to such configurations.
Nine large low-rise buildings of 5, 7.5 and 10 m high with flat roofs have been tested in a typical open country exposure in the Boundary Layer Wind Tunnel of Concordia University. The models have been tested for wind directions ranging from 0° to 90° at increments of 15°. The buildings have large square plan with equivalent full-scale horizontal dimensions ranging from 60 to 180 m.
Local roof pressure coefficients have been obtained from the wind tunnel measurements. Moreover, area-averaged negative peak pressure coefficients have been established using numerical integration of individual pressure coefficients. The effects of building dimensions on the generated roof pressures have been addressed in this study.
This thesis presents a comparative study based on code provisions and experimental results. The first part compares the application of the current code roof zone systems and the design wind pressures specified in codes and standards. The second part of the study compares the experimental results with the respective values specified in code/standard provisions in terms of wind pressures and roof zone sizes to assess the suitability of these provisions. These comparisons show significant differences in the patterns of the design pressure coefficients among the current wind codes and standards.
Application of the current provisions of ASCE 7-10 and NBCC 2010 on building geometries of large roofs and low height may lead to considerably conservative and uneconomic roof design. An exception for very long low buildings, as far as the determination of the sizes of roof edge and corner zones is concerned, has been recommended to rectify the deficiency of wind codes and standards for these building geometries.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering
Item Type:Thesis (Masters)
Authors:Alrawashdeh, Hatem
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Building Engineering
Date:9 September 2015
Thesis Supervisor(s):Stathopoulos, Theodore
Keywords:Wind codes and standards; large low buildings; design; edge and corner zones; roof pressures.
ID Code:980473
Deposited By: HATEM ALRAWASHDEH
Deposited On:02 Nov 2015 15:54
Last Modified:18 Jan 2018 17:51

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