tension compression splice
tension compression splice
(OP)
What's the difference between a splice, a tension splice and a compression splice?
The plans I'm looking at says use 30 bar dia. But then, right below it, it says to use a Class B tension splice in accordance with ACI 318.
The typical detail says "splice top and bottom bars as shown" It's nothing out of the ordinary. I have a multi span grade beam supported by drilled piers. Top bars lap at midspan and bottom bars lap at support.
So do I apply the 30 bar dia lap or the tension class B lap? I looked thru the ACI manual and it doesnt give me a definition nor does it tell me when to apply one or the other.
The plans I'm looking at says use 30 bar dia. But then, right below it, it says to use a Class B tension splice in accordance with ACI 318.
The typical detail says "splice top and bottom bars as shown" It's nothing out of the ordinary. I have a multi span grade beam supported by drilled piers. Top bars lap at midspan and bottom bars lap at support.
So do I apply the 30 bar dia lap or the tension class B lap? I looked thru the ACI manual and it doesnt give me a definition nor does it tell me when to apply one or the other.





RE: tension compression splice
I would use the specified Class B splice as that may be (probably will be) longer than the 30 bar diameters.
A splice is a way to take two separate bars and connect them or overlap them such that they work equivalent to a single bar across a specified location, such as a joint.
A tension splice is simply a splice that is dealing with bars in tension.
A compression splice is simply a splice that deals with bars in compression.
Splices can be overlapped bars (per ACI chapter 12) or mechanical connectors such as this: http://www.erico.com/products.asp?folderid=45
RE: tension compression splice
RE: tension compression splice
Lap splices are prohibited for most uses of bars larger than No. 11 by ACI 318-08 paragraph 12.14.2.1.
318-08 section 12.15.1 specifies that Class B laps are 30% longer than Class A splices.
Section 12.15.2 specifies that Class B is required except in certain instances.
In current practice, some engineers are permitting splices where previously prohibited, based on the thinking that Class B splices assure that all reinforcing is fully developed in all sections beyond the initial development length at discontinuous ends.