Concrete Frame Design
Concrete Frame Design
(OP)
I am designing a concrete pan joist floor to take the seismic shear. It's a concrete frame with pan joist connected to east-west beams between columns.
How would I model the 2D frame in StaadPro? Should I model the stiffness of the two neighbouring joist connected to columns and apply lateral loads to it?
Please advise.
Thanks in advance.
How would I model the 2D frame in StaadPro? Should I model the stiffness of the two neighbouring joist connected to columns and apply lateral loads to it?
Please advise.
Thanks in advance.






RE: Concrete Frame Design
Typically, on pan joist construction, we would create a wider (and perhaps deeper) joist on the column line to create a true beam-column system in both directions.
Also remember that if you count on the three adjacent joists for lateral resistance, their stiffness cannot be modeled by just adding their individual Ie values. This is because two of the joists would not frame directly into the column, but depend on torsional rigidity of the supporting beam.
Finally, a pan joists is typically a thin webbed member. With lateral loads you will most likely have compressive forces in your longitudinal reinforcing. This will require ties around the longitudinal rebar to confine and ties are not easily provided in thin webbed joists.
RE: Concrete Frame Design
Thanks