huangyhg

retrofitting new openings in existing tilt-up wall
we have a small project that involves retrofitting an existing tilt-up concrete wall building. the work includes cutting a few new door openings in the exterior precast walls. the kicker is that we have no drawings/design documents of the existing structure to reference for analysis purposes. anyone have some tips on how to estimate the required reinforcing/steel channel frame installation?? i would prefer not to have to do a full-blown gravity/lateral force analysis of the entire building. thanks for any suggestions.

to estimate rebars, have the owner hire a testing agency to figure out rebars and spacing. concrete strength can be estimated or found out by another test (taking core samples form non-critical area).
without these data to substantiate your calculations, you will be taking a huge risk. if you feel there is need for a lateral analysis, do not hesitate to tell the owner right now.

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