| Applies To | |||
| Product(s): | AutoPIPE, | ||
| Version(s): | ALL | ||
| Environment: | N/A | ||
| Area: | Load | ||
| Original Author: | Bentley Technical Support Group | ||
Problem:
What is the importance of annual probability of exceeding for Wind Calculation (say 1/500)?...What is the interpretation for this value and its relevance for determining wind load?
Solution:
The annual probability for exceedance of a 1/500 storm event is a 0.2% chance of getting or exceeding that storm event...this basically saying it's a 500 year storm which is only supposed to happen once every 500 years, but what it really means is there's a 1 in 500 chance, or 0.2%, of getting that storm event every year. But then you get a situation as seen in southern United States a few years ago where you get three 100-year storms in less than five years. AutoPIPE is not concerned with the frequency of a 1 in 500 year storm, what needs to be determine is what's the minimum design requirements to be modeled?
Are the Wind loads entered into the model based on a 1, 10, 50, 100, 500 and etc. event? Refer to governing regulation, building code, or project documentation for wind loads to be applied in a model. Apply the respective wind loads as desired into the AutoPIPE model.