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Existing Steel OMF on 2nd floor question

Existing Steel OMF on 2nd floor question

Existing Steel OMF on 2nd floor question

(OP)
I am doing some preliminary calcs for a client who want to turn an existing roof into a deck. This is a 2 story residence located in Seismic Design Cat D, the house is located on a gradual slope, so that the front of the house is 2 stories, with a below grade basement portion, and the rear of the house is 2 stories.

Since we will potentially be adding weight, and the "less than 10% increase in any existing lateral resisting line" code provision does not apply due to the City requirements are more stringent, I am trying to determine the impact of the added weight to vertical but more importantly, lateral.

There is an existing moment frame, I think OMF on the 2nd floor and it is supported on a steel floor beam. The existing plans, approved in 1989 have very limited info, but it looks like a good design for the time.

My question is would this steel omf be allowed within the current code? It meets all of the exception requirements in ASCE 7-10, 12.5.6.1 b, but it is located on the 2nd floor and supported in a steel beam.

There is also another steel OMF along the same line below this floor about 20 foot away connected with a steel beam.

Thanks

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