Thanks.
1. so is multilinear spring option not suitable?! Again, for any tension/ compression elastic spring (simulating behaviour of real frame absent) compression stiffness will be less than the tensile stiffness (e.g for a beam) thus can represent the spring stiffness, would this be correct assumption?! Just would like to confirm before I could confidently progress modelling!!
3. Is there a way available in StaadPro that allows modifying the material or stiffness properties?! E.g for a beam modelled in steel material and with a specified section properties, is there a way I can instruct program to consider only, say, 30% of 'E' (modulus of elasticity) and 45% I value?! Is this possible with Staad editor?!!
Thanks.