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10m is not a lot. I assume your existing columns are W Sections (I Beams). You can use W310x60 (or the same size as your column) as a trail beam size with bolted connections at end. Now there are different ways you can bolt the beam and columns together. You can provide an End Plate Connection. A 12mm end plate with 4 ASTM A324 Bolts (2 on each side of web) would do. This would be a pin connection. If you want a moment one then you will have to get the beam flange engaged, but do you really need a moment connection? You need to verify this design as I don't know your platform width. Also, like Uzair said, you need to verify existing members. Get a good reference book. Salmon and Johnson is good but little complicated. Kulak and Grondin is the best but its for Canadian Codes. Thanks.

If you could provide some photos & sketches about the site situation, it would be easier for the people here, to advise you in a better way. In general, you would also have to check load carrying capacity of existing support structure and foundations, to know whether these are capable of taking the proposed additional load safely, or they will also need strengthening.

Here is the presentation that highlights the difference between two approaches for foundation design. Thanks. Use of Limit State Design in Foundation Engineering.pdf

Is there any way to model boundary-element of shear wall in ETABS. Has anybody checked the validiality of using the line element as boundary-element at ends of shell element.