Rayengr
Structural
- Mar 6, 2006
- 5
I have a 4 story concrete building, shear walls, flat slab floors and roof with beams at every column line. The Penthouse smaller than the overall footprint and is supported by beams at the main roof level. All beams are on the main column grid.
My problem is getting the roof beams to recognize the loads from the penthouse walls and roof the walls support in both Etabs and Safe. I would expect these beams to have a higher moment than adjacent beams that do not have the extra load but I'm seeing considerably less. Its almost as if the walls are being designed compositely with the beams or its thinking these walls are deep beams.
How do I set the model so that the beams supporting walls (and roof)recognize the added loads and are analyzed/designed properly? Is there a modifier or something that I need to assign to the walls?
My problem is getting the roof beams to recognize the loads from the penthouse walls and roof the walls support in both Etabs and Safe. I would expect these beams to have a higher moment than adjacent beams that do not have the extra load but I'm seeing considerably less. Its almost as if the walls are being designed compositely with the beams or its thinking these walls are deep beams.
How do I set the model so that the beams supporting walls (and roof)recognize the added loads and are analyzed/designed properly? Is there a modifier or something that I need to assign to the walls?