Height in structure of point of attachment of component with respect to he base, what is "the b 1

[Revv]

hey guys,

so I'm in asce 7-16 working on seismic loads for components and I'm using equation 13.3-1. However, it provides the definition of "z" as shown in my title, but it doesn't explain what "the base" is. What do you guys consider the base? In my case, I'm attaching a building to the roof of an existing structure and would consider the base "0" or grade level.

 

[Deker]

The base is the same as that used for seismic design of the building. Generally that's grade level. For attachment to the roof, z/h is always 1.0.

 

[HTURKAK]

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