Wind-induced torsional loads on low buildings

Elsharawy, Mohamed; Stathopoulos, T.; Galal, Khaled

doi:10.1016/j.jweia.2012.03.011

Cited by 11 publications

(7 citation statements)

References 3 publications

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“…Tamura et al (2001) examined the correlation of torsion with along-wind and across-wind forces for rectangular low-rise buildings tested in simulated open and urban terrain exposures. Low-rise buildings of different roof slopes were also tested by Elsharawy et al (2012). Good agreement was found when the results were compared with Isyumov and Case (2000) study for similar tested cases (i.e.…”

Section: Introductionmentioning

confidence: 88%

“…The power law index α of the mean wind velocity profile was set at α = 0.15. Although the majority of medium height buildings are situated in suburban terrain, an open exposure was considered as higher overall wind loads are expected, as discussed in Elsharawy et al (2012). However, it is also recognized that rougher terrain exposure, in some cases, may result in greater unbalancing of wind loads and torsion.…”

Section: Terrain Simulationsmentioning

confidence: 99%

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Comparison of wind tunnel measurements with NBCC 2010 wind-induced torsion provisions for low- and medium-rise buildings

2014

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The aim of this study is to assess wind-induced torsional loads on low- and medium-rise buildings determined in accordance with the National Building Code of Canada (NBCC 2010). Two building models with the same horizontal dimensions but different gabled-roof angles (0° and 45°) were tested at different full-scale equivalent eave heights (6, 12, 20, 30, 40, 50, and 60 m) in open terrain exposure for several wind directions (every 15°). Wind-induced measured pressures were numerically integrated over all building surfaces and results were obtained for along-wind force, across-wind force, and torsional moment. Torsion load case (i.e., maximum torsion and corresponding shear) and shear load case (i.e., maximum shear and corresponding torsion) were evaluated to reflect the maximum actual wind load effects in the two horizontal directions (i.e., transverse and longitudinal). The evaluated torsion and shear load cases were also compared with the current torsion- and shear-related provisions in the NBCC 2010. The results demonstrated significant discrepancies between NBCC 2010 and the wind tunnel measurements regarding the evaluation of torsional wind loads on low- and medium-rise buildings. Finally, shear and torsion load cases were suggested for evaluating wind loads in the design of low- and medium-rise rectangular buildings.

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Section: Introductionmentioning

confidence: 88%

Section: Terrain Simulationsmentioning

confidence: 99%

Comparison of wind tunnel measurements with NBCC 2010 wind-induced torsion provisions for low- and medium-rise buildings

2014

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“…Tamura et al [11] examined correlation of torsion with along-wind and across-wind forces for rectangular low-rise buildings tested in simulated open and urban terrain exposures. Low-rise buildings of different roof slopes were tested by Elsharawy et al [12] but peak torsions evaluated by current wind provisions were found to be different from the measured peak torsion in the wind tunnel.…”

Section: Introductionmentioning

confidence: 98%

Torsional and shear wind loads on flat-roofed buildings

Elsharawy

Galal

Stathopoulos

2015

Engineering Structures

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There is limited information available on wind-induced torsional loads on buildings. This paper presents results of wind tunnel tests carried out on a series of models of low-and medium-rise buildings. Four buildings with the same plan dimensions but different heights (6, 12, 25 and 50 m) were tested in a simulated open terrain exposure for different wind directions. Synchronized wind pressure measurements allowed estimating instantaneous base shear forces and torsional moments on the tested rigid building models. Results were normalized and presented in terms of mean and peak values of shear and torsional coefficients for two load cases, namely: maximum torsion and corresponding shear, and maximum shear and corresponding torsion. Comparison of the wind tunnel test results with current torsionand shear-related provisions in the American Standard as well as the Canadian and European codes demonstrates significant discrepancies. The findings of this study could assist wind code and standards committees to improve provisions for wind-induced torsional loads on buildings.

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“…When these provisions were compared by Elsharawy et al (2012) for three low-rise buildings with different aspect ratios (L/B= 1, 2, 3), significant differences were found in evaluating design wind loads -see Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Design Wind Loads Including Torsion for Rectangular Buildings with Horizontal Aspect Ratio of 1.6

2014

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Limited information is available regarding wind-induced torsional loads on buildings. This paper presents results of tests carried out in a boundary layer wind tunnel using building models with the same plan dimensions (aspect ratio of 1.6) and located in a simulated open terrain exposure for different wind directions. Synchronized wind pressure measurements allowed estimating instantaneous base shear forces and torsional moments on the tested rigid building models. Results were normalized and presented in terms of shear and torsional coefficients for two load cases, namely; maximum torsion and corresponding shear, and maximum shear and corresponding torsion.Comparison of the wind tunnel test results with current torsion-and shear-related provisions in the American Standard (ASCE 7) demonstrates good agreement for low-rise buildings but differences for medium-rise buildings.

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Wind-induced torsional loads on low buildings

Cited by 11 publications

References 3 publications

Comparison of wind tunnel measurements with NBCC 2010 wind-induced torsion provisions for low- and medium-rise buildings

Comparison of wind tunnel measurements with NBCC 2010 wind-induced torsion provisions for low- and medium-rise buildings

Torsional and shear wind loads on flat-roofed buildings

Design Wind Loads Including Torsion for Rectangular Buildings with Horizontal Aspect Ratio of 1.6

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