tclat
Structural
- Oct 28, 2008
- 109
Hi,
I doing a structural review of drawings prepared by a precast concrete manufacturer.
They have created a precast floor element which is 6 feet wide x16 feet long. The perimeter of this element is thickened to 10inches deep by 6 inches wide while the interior part of the element in 2.5" thick. PCV sleeves are embedded in these elements.
The elements are then fixed to a precast beam that has dowels which fit into the sleeves. The sleeves are then filled with non shrink grout. The beams are also connected to precast columns in this manner
It is intented that a 2" topping will be applied with mesh to get the section to work compositely.
I know this is possible since many proprietry systems so the same thing with just a roughened slab and shear connectors only at the perimeter where the floor elements are supported (beam or wall)
My question are
1. How do you establish the right amount of roughness to allow the precast floor element slab with the topping to act compositely.
2. Can I get the thickened edge of these floor elements to act as a Tee Beam using the composite slab thickness.
3. Am I too conservative if I design only the concrete topping to handle the diaphragm loads.
4. Is is ok to only have connections like these which in my opinion are only capable of resisting shear which the sleeves are PVC.
I am in a siesmic area.
Thanks
I doing a structural review of drawings prepared by a precast concrete manufacturer.
They have created a precast floor element which is 6 feet wide x16 feet long. The perimeter of this element is thickened to 10inches deep by 6 inches wide while the interior part of the element in 2.5" thick. PCV sleeves are embedded in these elements.
The elements are then fixed to a precast beam that has dowels which fit into the sleeves. The sleeves are then filled with non shrink grout. The beams are also connected to precast columns in this manner
It is intented that a 2" topping will be applied with mesh to get the section to work compositely.
I know this is possible since many proprietry systems so the same thing with just a roughened slab and shear connectors only at the perimeter where the floor elements are supported (beam or wall)
My question are
1. How do you establish the right amount of roughness to allow the precast floor element slab with the topping to act compositely.
2. Can I get the thickened edge of these floor elements to act as a Tee Beam using the composite slab thickness.
3. Am I too conservative if I design only the concrete topping to handle the diaphragm loads.
4. Is is ok to only have connections like these which in my opinion are only capable of resisting shear which the sleeves are PVC.
I am in a siesmic area.
Thanks
