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@BWCSA @hokie66 @Ingenuity you are all absolutely right. I did in fact just notice the drop panel (band thickening) in the drawing. I will confirm it on site. However, if I do the reinforcement of FRP or upturn beams on top of the slab, then we whould not interfere with the drop. Do you gents...

@hokie66 the dashed lines represent bottom steel placement, no thickened areas. Thank you all for your advice so far. I am eager to hear other ideas for reinforcement of such an opening. If reinforcement is required based on analysis, how would we detail an upturn beam or frp strips? In other...

@HTURKAK the opening is for massive electrical conduits, it is not standard wiring - hence the reason for such a large opening. There is a new set of big transformers being placed at the floor below and the conduits are associated with those. There is a bit of room for shifting the opening but...

Hi @hokie66 and @Ingenuity, Thanks for your feedback. This is indeed the C.A.P. Turner mushroom system described by @Ingenuity! To answer your question, the slab thickness seems to be 12 inches, and the intended live load would be 50 PSF. The dashed lines on the plan snippet represent bottom...

@jayrod I agree with you. I am going to try to push back and see what the alternatives are in terms of re-locating if possible. However, if relocation is not possible, then I also very much agree that a major reinforcement system will be needed. That system will involve either upturn beams or...

@jayrod see my note above. The reinforcement system used is called the Cap system, it is an old design system that is obsolete that does not act as the current orthogonal systems do, i.e. it seems to be a cantilever system. Please let me know your thoughts when taking that into consideration?

@JedClampett thanks for your input. So essentially you are describing your reinforcement method to the red opening in the diagram, correct? Will the upturn beams frame all the way to the orthogonal strips? Also, I believe that what is shown in the existing drawing is an old design system termed...

@jayrod12 thank you for your input. I may not be able to change the location of the opening due to the frozen layout requirements. I realize that we are cutting into existing seemingly column strip bars, that's why I am asking if there is any ideas on how to reinforce the slab? FRP or upturn...

Hello all. I am currently working on a project whereby we are required to evaluate and potentially reinforce an existing concrete slab due to the creation of a future 4 feet by 4 feet future opening for electrical conduits. We are dealing with a very old building that is in good shape (built in...