IMPACT OF HEAVY WINDS ON STRUCTURES
Wind is the flow of gases on large scale, containing bulk movement of air. It is caused by difference in the atmospheric pressure, such that, encourages movement of air from the higher to lower pressure area, resulting in winds of various speed.
Wind forces are complex, and the effect on building structures depend on the interaction of many variables. Natural variables include features and properties of the air. These variables create differences in pressure that push and pull on the exterior surfaces of the building, through the following processes, Uplift, Tilting, Overturning etc.
Hurricane or Tropical cyclone, is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms, that produce heavy rainfall. The impact on buildings can be dangerous and hazardous, which includes lateral or sideways movement of the structures and collapse.
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Olusegun Afolabi R.Eng
University of Lagos
Lagos
234803 4248600
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Original Message:
Sent: 06-20-2019 06:58
From: Neeraj Agrawal
Subject: Hurricane wind on structures
Design criteria from one of our US Customers specifies 60m/s as hurricane wind speed (as per ASCE 7-10) and it also states that the hurricane can occur 8 times over a span of 50 years. Can anyone help me in understanding this additional requirement? Does this additional clause have any effect on design wind speed (like modification of return period or additional factor etc.) or I can simply take design wind speed as 60m/s and design the structures as usual (i.e. simply ignore the second statement)?
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Neeraj Agrawal
Gurgaon
India
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