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You can choose both codes to proportion your shear walls for design loads. I suggest, go with the latest version of ACI 318. If I understand correctly, your shear wall is supporting columns. In this case, special seismic affects do not apply. They would have valid for columns, if your columns were supporting the shear wall.

http://www.curee.org/ Go to this website to access tons of free research material on seismic research. Unfortunately, CUREE will pack up soon at the end of this year so benefit from their decade's worth of experience. and also teach me a thing or two at the end lol. JazakAllah Khair. Regards

WA. UBC Section 1630.9 deals with Drift and Drift Calculation requirements. Section 1630.9.1 outlines the procedure for determination of Delta_S i.e., structural deformation due to seismic effects, whereas Section 1630.9.2 is related to the determination of Maximum Inelastic Response Displacement (Delta_M). Story Drift Limitations are given in UBC Section 1630.10. Regards.

Yes there is; read the section 1630.9.2 of the UBC 97.

I have worked with some engineers that like to assign high stiffness modifiers to rafts to get conservative flexural and shear design of foundation. Assigning modifiers would increase amount of rebar in your raft. I personally think that this is good practice as nothing is perfectly rigid and cracking in inevitable, which would result in loss of inertia and high flexural stresses. The general procedure is to create two models. One with no stiffness modifiers and one with modifiers for foundation/ raft. You should use the first model to calculate piles reactions and the second to do flexural and shear design. Thanks.