R value for a reinforced concrete frame structure 1

[dreber]

This is a 1920s reinforced concrete moment structure in Seismic Design Category D.

In the other direction, it has masonry infill between the columns and beams, however in the direction I am working on, there is nothing resisting seismic shear except for the concrete frame and the steel moment frame(s) we are installing (either intermediate or ordinary). The frames will be able to withstand at least 25% of the ASCE7-05 seismic loads.

My question to you is: what would you use for the all-important R value?

 

[wannabeSE]

It depends what your goal and purpose is for installing new steel moment frames. There may be better resources than ASCE 7-05. Not much if anything built in 1920 considered earthquake forces. You might want to look at the following publications (the FEMA documents are free):

FEMA 356 Prestandard and Commentary for the Seismic Rehabilitation of Buildings

http://www.fema.gov/library/viewRecord.do?id=1427

FEMA Techniques for the Seismic Rehabilitation of Existing Buildings

http://www.fema.gov/library/viewRecord.do?id=2393

ASCE 31-03 Seismic Evaluation of Existing Buildings

http://www.asce.org/Books-and-Journ...mic-Evaluation-of-Existing-Buildings-(31-03)/

ASCE 41-06 Seismic Rehabilitation of Existing Buildings

http://www.asce.org/Books-and-Journ...Rehabilitation-of-Existing-Buildings-(41-06)/