Load transfer from secondary RC beam to WIDE primary RC beam

[Samuee]

Hi buddy,

When we are doing rc beam design, we always think of its longitudinal reinforcement and shear links, while the width of RC is not restricted by code as I remember.

I thought of an scenario, when secondary is connected to a wide primary beam, the load path on path is shown as picture below, before the very wide beam to transfer load to supporting members like column, it will transversely bend. Do I need to cater this kind of transverse stress. If yes, any code can be reference too?

 

[HTURKAK]

If you perform continuous beam analysis for the secondary beam, you will model the primary beam assuming support for the secondary beam and provide span and support rebar as necessary.

If you model the two beams with a famous software, neither the software nor the beams know primary or secondary beam and the analysis will be based on compatibility deflection of connection and the span and support moments will be somehow different ..However, the total moment for the beams still remain the same.

You are expected to provide longitudinal ( bending ) and transversal ( shear ) reinforcement for secondary and primary beam.

 

[KootK]

You are right to be concerned about the stresses at the joint. The sketch below shows how I most often see designers address such situations. This is really just a reflection of the shear, bending, and hanger reinforcement provisions of whatever code you're designing to.