Embedment in Concrete
Embedment in Concrete
(OP)
I am starting another thread hopping I will get some responses this time.
I have been searching for a good approach on the design of post embedment in concrete slab that varies in thickness from 4" to 7". ACI 6.3 discuss this subject but it does not in any way describe a method of design. The post is subject to a lateral load of about 640lb on the top of the post due to wind and due to the fact that the post is a member of a glazed railing. As you know the minimum load that the railing should be designed for is 50 lb/ft along the top rail and 200 lb at any point along the rail. However, when the railing is glazed railing and is subject to high wind pressure the load increases. Therefore, the embedment in concrete slab must be improved. How would you approach this problem?
I have been searching for a good approach on the design of post embedment in concrete slab that varies in thickness from 4" to 7". ACI 6.3 discuss this subject but it does not in any way describe a method of design. The post is subject to a lateral load of about 640lb on the top of the post due to wind and due to the fact that the post is a member of a glazed railing. As you know the minimum load that the railing should be designed for is 50 lb/ft along the top rail and 200 lb at any point along the rail. However, when the railing is glazed railing and is subject to high wind pressure the load increases. Therefore, the embedment in concrete slab must be improved. How would you approach this problem?






RE: Embedment in Concrete
1) thicken the slab around the post area
2) add cont. reinforcing bars around the posts in these thickened areas
3) place post in a concrete pier for the embedment length required beneath the slab
4) design the embedement length/diameter of pier according to UBC embedment formulas
RE: Embedment in Concrete
RE: Embedment in Concrete
RE: Embedment in Concrete
RE: Embedment in Concrete
Assuming you have this condition at other than a ground floor (elevated slabs), then the embedment condition becomes somewhat difficult. For high moment at the embedment, the tension component of the couple created in the concrete can be quite high and will require auxiliary reinforcement with a loop or hairpin bar wrapping each embedment area. This is necessary to prevent blowing off the edge of the concrete. Due to the potential for reversals, this reinforcement should be top and bottom.
RE: Embedment in Concrete
Carl Bauer
www.bauerconsultbotswana.com