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Yes! Needless to say: cracked. One also need to specify the source of reinforcement as well via "cracking analysis options".

I have a vague idea on how to approach it. But, yo should ask this question to some one in academics. Most of the practicing structural engineers do not need to do this in their projects; if you dot not do something often, then that concept goes away after period of time. Vague Idea for a particular mode: mass matrix x acceleration matrix + stiffness matrix x displacement matrix = 0 You can get mass, acceleration and displacement data for a particular mode and then work out stiffness matrix. I am not sure if it will be helpful or not.

HI @JL07, I am working on a US job right now and we do include the live load, anchor load with dead and seismic. I am not sure how exactly the code words it out but its standard practice in the company I work for reasons explained above. Seismic LC's (for drift) are without redundancy factor and deflections from LCs are amplified by multiplying the deflection to Cd/Ie. Hope that helps. Thank you.

Wsalaam.. First, we need to understand why this happened. 1) Was this because the existing design was inadequate. -> You need to do validate existing design to check this. 2) Was this because the construction wasn't as per the design. -> I doubt you will have any construction record so you need to see photos of construction if available to make sure the lengths were right. Get some additional NDTs to confirm rebar size, spacing, cover, concrete strength to figure out the problem. 3) Based on above you, you can suggest the path forward. Hope that helps.