setom17

I'm modelling an 8-Storey with Basement building, currently I have two shear walls, and both are failing in shear at the bottom from basement to 4th storey.the base is currently at 550mm thk, and it's still failing. How can I go about this? I have attached the screenshot of my model, the top is the framing from 5th to 8th while the bottom is from basement to 4th.Any help would be very much appreciated. Seismic Zone 4, Na = 1.2, Nv = 1.6Thank you!