![]() ![]() Some of us recall that 1964 was a good year. ![]() From Leutheusser ( 2) and the Department of Mechanical Engineering, University of Toronto, 1964. Neat eh? All this from a University of Toronto guy, go Varsity Blues (Leutheusser, H.J., 1964 ( 2)).įigure 1: Roof Edge Wind Effects-When wind blows against a building, it produces vortices at the roof edges.įigure 2: Pressure Differences-Notice the large pressures at roof perimeters. Parapets dramatically reduce these pressure differences at roof edges ( Figure 3). When wind blows against a building it produces vortices at the roof edges ( Figure 1) that create huge pressure differences ( Figure 2) at roof perimeters that can suck roofs off buildings. Not so in the old days where they were useful in fire protection. 1 Their major function today, aside from confusing architects, is to protect the edge of roof assemblies from wind uplift forces. Historically, so many problems have occurred with parapets that we have a name for it: “ parapetitus.” They have a long history-which of course is not always clear-that allows me to embellish without threat of peer review reversal. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |