Biaxial stresses in concrete beams 1

[struct_eeyore]

Hi all,

I have a case where one concrete beam supports another, a cantilever. The cantilever is perpendicular and runs thru the main beam. I've done this many times, but I've now started to wonder if there is some sort of stress check that need to be done for the biaxial stress that occurs at the shared prism of concrete at the intersection, esp. when beams are designed to capacity. In particular, for the case where the main beam is continuous, so that compression-compression case occurs. Any thoughts?

 

[struct_eeyore]

As usual, thanks for all the input - a bit to digest here. I'll admit my knowledge of STM is very limited - which leaves me asking about what kind of reduction should be used in traditional beam design where intersecting tension/compression fields are encountered? .6 seems a bit to steep, but is it?