Precast Lin Tees (Single Tee not Double Tee precast planks

[trence76]

I am looking at existing structural drawings for a building in Maryland and they indicate 8L36 Lin Tees. Not knowing what they were, I discovered that Lin Tees are single Tee precast concrete planks, similar to double tees today, only that they are single tees, developed by a guy with the last name "Lin", believe it or not, in 1962.

I need to evaluate the capacity of the single tee, however, the only information I have is that the stem is 8" wide, the T-flange is 8'-0" wide, and that they may have been fabricated by Baltimore Concrete Plank Company (or equal, as noted on drawings).

If anyone can help I would appreciate it. I am hoping there might be load tables out there somewhere for this.

 

[Teguci]

I have "Prestressed Concrete" by Edward Nawy. On page 19 and 20 he gives an example calc for an 8'-0" wide Tee with 8" stem. However, that's not going to help you unless you have more info (concrete strength, tendon stress, qty and size, concrete topping, etc...).

I would think your best bet is to load test. Not sure if there is an ICRI spec or some other organizations documentation. Basically, you fill a bladder with water to a given elevation/weight and check the deflections.

As a caution, if this is a garage without field topping, you should verify the condition of the top flange reinforcement. It may be almost gone.

 

[trence76]

I also know that it is 36" deep and they spans 89'-5". It has a topping slab of 2-1/2" gypsum slab topping.

 

[hokie66]

Have you tried contacting the original design engineer? Some of us old guys are still around. T Y Lin, unfortunately, is not.

http://en.wikipedia.org/wiki/Tung-Yen_Lin