Bearing on Experimental Beam Design

[Perception]

Hello everyone,

I am designing a reinforced concrete beam to be broken utilizing our Civil Engineering lab. The beam will be put into 3 point bending until it fails. The beam will be supported by resting on two W24 x 192 sections. I am looking to get a flexural failure out of the test, so I want to design for any other failure modes before testing. I am concerned about possible bearing failure of the beam at the support. How do I check the bearing of the beam at the support? Would the check be like the dowel design for a column going into a foundation? If the beam does need bearing reinforcement at the support, where is the reinforcement placed (more stirrups?).

Thanks

 

[Archie264]

I'm thinking you'd have a difficult time making the crushing strength of concrete be the controlling factor. At least, not in a configuration where you'd be able to simultaneously load the beam to flexural failure.

 

[dhengr]

Perception:
Why not cast a couple 1" thick bearing pls. into the bot. of your beam? Their width matches your conc. beam width and their length matches the flg. width on the W24. They have a trapezoidal compressive bearing pressure on your conc. beam, from the W24 web to the tip of the stl. flg. in such a way that the W24 flg. deflection start to match the bending slope of your conc. beam.