The intent of my original question was to find out why the Kz value was not being used with the simplified envelope method. If I had a spreadsheet to go by it would probably help answer my question. I understand what, why and how the "importance factor" was used in ASCE 7-05. I understand...
actually sq.rt. of 0.6 if going from an ultimate wind speed to a wind speed used in allowable stress design.
I am just puzzled as how you can use information from a map that assumes 1 set of criteria to navigate a table that assumes a completely different set of criteria.
That's what I ultimately did. I applied a load factor of 0.6 and achieved the pressures I was expecting. If you look at figure 28.6-1 (cont.) it clearly says that the tables assume an I = 1.0. But you are correct, there is no importance factor anymore... only risk categories. This was one of...
I agree, simplified = conservative. A 10-20 psf higher pressure seems too conservative to me. Here is what puzzles me - The simplified method utilizes tables based on a height of 30 feet and a wind design category B and an Importance factor of 1. The wind speed maps it tells us to reference...
Can someone explain to me why the simplified method does not use the Kz, velocity pressure exposure coefficient? I am getting much higher pressures using the simplified envelope method.
Thanks
