02-02-2009, 09:18 PM
Can u suggest me most common values of stiffness modifiers for columns, beams, walls etc.
1. Best source of recommended values - the concrete design code used in your country
2. Paulay and Priestly's book
3. Charles Salmon's book on reinforced concrete
4. ACI 318-08 (recently posted in the forum), etc.
I read somewhere that two slabs shall be modeled as shell to have both Membrane(in plane forces) +Plate (bending) behavior. If u model it as memebrane there will not be any bending.
If you intend to design your slab for needing bending, go for SAFE instead of ETABS. Membrane - no out-of-plane stiffness; load distribution to your supporting beams will be roughly similar to how you would distribute the loads with 45deg angle for tributary area.
1. Best source of recommended values - the concrete design code used in your country
2. Paulay and Priestly's book
3. Charles Salmon's book on reinforced concrete
4. ACI 318-08 (recently posted in the forum), etc.
I read somewhere that two slabs shall be modeled as shell to have both Membrane(in plane forces) +Plate (bending) behavior. If u model it as memebrane there will not be any bending.
If you intend to design your slab for needing bending, go for SAFE instead of ETABS. Membrane - no out-of-plane stiffness; load distribution to your supporting beams will be roughly similar to how you would distribute the loads with 45deg angle for tributary area.