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Thank you to all that responded. I wanted to let you know that a response was received from the ASCE 7 Wind Subcommittee. They indicated that for the hipped end in the case where the wind is parallel to the ridge the bottom section of the table provided in Fig 27.3-1 (Parallel to Ridge for all θ...
A temporary structure sloped asbestos sheet roofing plan is given attached. When wind is blowing the roof is flew away. Suction pressure is came into play. Wind was entered through the open side which did the harm. -- Alex Thomas R.Eng, C.Eng, M.ASCE Senior Site Engineer Geo Structurals Pvt...
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Assem This is an excellent question, that has been considered, but not answered many times by the ASCE 7 committee. There are two relevant points of view: 1- Since a temporary structure will exist only for a limited time period, if it is designed for the same load return periods as permanent...
Hello, We design and install meteorological guyed and self-supported masts. Most of our masts have service lives of 1 to 3 years. Since we consider them risk category I, we use a 300-year mean recurrence interval. However, we are curious to know whether it is an acceptable practice to assume...
Parallel to ridge but suction pressure is to be considered Alex Thomas MIE REng CEng M ASCE
I would say parallel to ridge. If nothing else, I believe the direction of the wind load is opposite than what you have shown. It should be towards the wind surface, not away from it.
Hi Keith MacBain, Thanks for the feedback. In this case I am the software developer for the Wind software and that's the reason I'm trying to get clarity. I can see both sides of the argument and am hoping to get a definitive answer. Mr. Ronald Hamburger from the ASCE 7 wind committee frequently...
Chris, Another approach is that you could ignore the pitch of the green surface entirely and follow only the second table when wind is parallel to the ridge. This means that the green surface would receive the same pressure as say the pink surface depending on the distance from the windward edge...
Hi Chris, My interpretation is that terms normal or parallel to ridge pertain to the wind direction, not the surfaces. If pressed for an answer, I believe I'd characterize the green surface as normal to the ridge, but I believe that's not how one enters Figure 27.3-1. For your image the wind is...