Hi, In commentary of ASCE7-16, it 3

[SouradeepGuha]

Hi,
In commentary of ASCE7-16, it is stated that
"A strength level design wind speed map brings the wind loading approach in line with that used for seismic loads, in that they both are aimed at achieving uniform risk rather than uniform hazard."

Can someone please explain what is meant by uniform risk and hazard?

-Soura

 

[r13]

Traditionally, the seismic design was base on strength level load, but the wind remained in working stress level. This trend has changed since ASCE7-10, as described in quote below"

"Wind speed maps:

Simply put, for the contiguous U.S., ASCE 7-05 has one wind speed map and it is based on Allowable Stress Design. ASCE 7-10 has three wind maps, based on Risk Category I, Risk Category II, and Risk Categories III and IV, and they are based on Strength Design. ASCE 7-16 has four wind speed maps, one for each Risk Category and they are also based on Strength Design.

Note: This blog is not going to try to explain the difference between ASD and Strength Design loads. It’s a hardy structural engineering discussion! However, the appropriateness of using ASD values with roofing systems and the adjustment of the Strength Design to ASD values are addressed in the 2018 IBC and in ASCE 7-16."

I could be wrong, and have no doubt that someone can provide better explanation.

 

[Lomarandil]

Uniform hazard: These two structures are equally likely to fail
Uniform risk: These two structures will have equal consequences if they fail

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just call me Lo.