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ASCE 7-10 table 27.6-1

ASCE 7-10 table 27.6-1

ASCE 7-10 table 27.6-1

(OP)
I am trying to figure how to use table 27.6-1 of ASCE 7-10 as there are two values for each wind case. Why are there two values?

For example: 130mph exp B L/B=0.5 height = 30'-0" it gives 27.5 25.3.

RE: ASCE 7-10 table 27.6-1

Those are two load cases. You have to check both.

RE: ASCE 7-10 table 27.6-1

(OP)
That doesn't make any sense. Why would the lesser of the two numbers ever control?

I think I have found the answer. It looks like one number is the pressure at the top of the building and the other number is the pressure at the base of the building. This appears to be explained in table 27.5-1 on page 272.

I am using this chart to verify that my calculations from Part 1 are correct (on the same order of magnitude).

RE: ASCE 7-10 table 27.6-1

Part 2 typically is more conservative - being a simplified version of Part 1.

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RE: ASCE 7-10 table 27.6-1

Have you looked at the notes on the first page of the table? It says one is for top of building and the other is for base.

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