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How to Retrofit a Concrete Beam

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Existing structural plans show "pre-cast concrete beams by others" (which are above grade, not in the soil) running 25 ft O.C. and the dimensions are approximately 24"wi X 36" deep.  These beams run approximately 50 ft to hold up a building on top.  Below is a parking garage underneath the building.  We cannot find the existing plans that show the existing reinforcement  in the concrete beam, so we cannot analyze the existing beam with the new live load.  The reason why we are adding more live load onto the concrete beams is due to an architectural remodel. 
I guess I have a few questions.  First, how would someone go about analyzing an existing concrete beam and not knowing the reinforcement.  How can we find out what the reinforcement is?  Can we xray the concrete beam?  Or is there any other procedure to figure this out?
Also, i'm assuming the worst and i cannot figure out what reinforcement is doing inside the concrete beam.  Is there a way to retrofit these concrete beams without knowing the existing reinforcement?  How would you retrofit the concrete beams? Please go into detail as much as you can with the procedure.
Thank You,