A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Aerodynamic Mitigation of Low-Rise Building Roofs
During a windstorm, low-rise buildings’ roofs are subjected to high wind uplift forces (suctions), which often lead to severe dislodging of roofing components that may impose hazards of flying debris and possibly, water intrusion. At building edges, a separation bubble is created at the roof regions close to the leading edges, causing uplift forces to the roof. Several methods to mitigate the uplift pressure on the roofs of residential buildings have been proposed, including side edge modifications and roof parapets. In the current study, four different aerodynamic mitigations are examined, including (i) full wall edge extension, (ii) full ridge extension, (iii) combined edge and ridge extensions, and (iv) discontinuous solid parapets at corners. These modifications are examined on a typical low pitch gabled roof building with footprint dimensions of 10 × 15 m and a height of 5.25 m. The proposed mitigations were assessed using high-fidelity computational fluid dynamics (CFD), adopting large eddy simulation (LES). The results showed that discontinuous solid parapets with 750 mm height could reduce the mean suction pressure at the gable end and in zones next to the ridgeline by an overall of 28% and 45%, respectively. Adding solid discontinuous corner parapets to the benchmark study model reduced the average roof total uplift by up to 8%. Although ridgeline extension did sightly increase the roof's overall uplift, it was found to significantly reduce the overall suction in zones next to the ridgeline (i.e., 90%)
Aerodynamic Mitigation of Low-Rise Building Roofs
During a windstorm, low-rise buildings’ roofs are subjected to high wind uplift forces (suctions), which often lead to severe dislodging of roofing components that may impose hazards of flying debris and possibly, water intrusion. At building edges, a separation bubble is created at the roof regions close to the leading edges, causing uplift forces to the roof. Several methods to mitigate the uplift pressure on the roofs of residential buildings have been proposed, including side edge modifications and roof parapets. In the current study, four different aerodynamic mitigations are examined, including (i) full wall edge extension, (ii) full ridge extension, (iii) combined edge and ridge extensions, and (iv) discontinuous solid parapets at corners. These modifications are examined on a typical low pitch gabled roof building with footprint dimensions of 10 × 15 m and a height of 5.25 m. The proposed mitigations were assessed using high-fidelity computational fluid dynamics (CFD), adopting large eddy simulation (LES). The results showed that discontinuous solid parapets with 750 mm height could reduce the mean suction pressure at the gable end and in zones next to the ridgeline by an overall of 28% and 45%, respectively. Adding solid discontinuous corner parapets to the benchmark study model reduced the average roof total uplift by up to 8%. Although ridgeline extension did sightly increase the roof's overall uplift, it was found to significantly reduce the overall suction in zones next to the ridgeline (i.e., 90%)
Aerodynamic Mitigation of Low-Rise Building Roofs
Lecture Notes in Civil Engineering
Walbridge, Scott (editor) / Nik-Bakht, Mazdak (editor) / Ng, Kelvin Tsun Wai (editor) / Shome, Manas (editor) / Alam, M. Shahria (editor) / el Damatty, Ashraf (editor) / Lovegrove, Gordon (editor) / Al-Chalabi, Raghdah (author) / Elshaer, Ahmed (author)
Canadian Society of Civil Engineering Annual Conference ; 2021
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2021 ; Chapter: 45 ; 531-543
2022-04-14
13 pages
Article/Chapter (Book)
Electronic Resource
English
| British Library Online Contents | 1992
Pressure factors for edge regions on low rise building roofs
| British Library Conference Proceedings | 1995
Pressure Factors for Edge Regions on Low Rise Building Roofs
| British Library Conference Proceedings | 1994