Are Concrete Moment Frames Reusable/Re-Occupiable?
Are Concrete Moment Frames Reusable/Re-Occupiable?
(OP)
I have been wondering if concrete moment frames, like the special moment frame, are reusable? Can the yielded rebar be replaced or is it just an analysis procedure to deem the structure occupiable? What about mild steel in precast hybrid moment frames? Can they be replaced?
RE: Are Concrete Moment Frames Reusable/Re-Occupiable?
RE: Are Concrete Moment Frames Reusable/Re-Occupiable?
RE: Are Concrete Moment Frames Reusable/Re-Occupiable?
Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik
RE: Are Concrete Moment Frames Reusable/Re-Occupiable?
Just to be clear: apparently the moment frame you are talking about has seen some sort of big seismic event....yes?
But in any case, I agree with dik.....if it's in good shape....no reason not to use it.
RE: Are Concrete Moment Frames Reusable/Re-Occupiable?
RE: Are Concrete Moment Frames Reusable/Re-Occupiable?
But probably the best of all would be to recreate the event (via time-history in something like STAAD; assuming that data is available) and seeing how many cycles it has gone through.
RE: Are Concrete Moment Frames Reusable/Re-Occupiable?
The structure is repaired if feasible and the rebars are not replaced ..
If you write seismic performance levels and search , one of the outcomes FEMA 273 performance levels..
The picture depicts also replacement , repair cost vs performance levels..
You know P58 and ASCE 41..
I will suggest you to look ACI 369 and NIST GCR 16-917-40
https://nvlpubs.nist.gov/nistpubs/gcr/2016/NIST.GC...
When a RC special moment frame , subject to seismic event, the expected mechanism SHALL BE at least Intermediate mechanism (Figure 3-1. Design of special moment frames aims to avoid the story mechanism ..) and if plastic hinges develop at all probable beams , the structure is around collapse prevention level and the option is , demolish and construct new..
If ( say for the fist three storey beams of a ten storey frame ) 10 % of beams yield and hinge develops, still 90 % still elastic and the bldg could be occupied after small repairs , so the full potential is not exhausted..