HUGE difference in natural period using C01 and C02

[Jfoyian]

Hi,

I am conducting dynamic analysis for an 8 story cantilever RC shear wall. The problem is that, I am getting the natural period T=0.49 when I use concrete C02, but T=1.94 when I use concrete C01. I couldn't figure out why that difference is that big and I was wondering which one I should go with.

Thanks for your help.

[silvia]

good results.
they models are different and, likely, the tensile stiffness controls in some section locations, and they definitely do have different tensile stiffnesses.

i'd go with concrete02, there is no practical advantage to concrete01, the reduced number of parameter differences are minimal.