li0ngalahad
Structural
- May 10, 2013
- 89
Hi all
I am trying to design steel-concrete encased composite beam, more precisely a cast-in plate (in green, see drawing attached) inside a concrete beam. This is mainly to increase the shear capacity of the beam (it's a linking beam in a liftcore). To make steel and concrete act together we need to connect the two elements with studs (in blue) to transfer the longitudinal shear to prevent slippage between the two. It is easy to calculate it for the common composite beam with the concrete slab above the steel beam flange (the classic V*Ay/I), but in this case I am a bit puzzled, I don't really know how to calculate it because it's not merely connecting a flange to a web but two separate members on the same neutral axis.
I had a look if there was any guidance in the EC4 design guides for partially encased composite beams (which would have a similar situation in the shear flow calculation) but couldn't find anything. In the EC4 part 2 (Composite design for Bridges) it is even mentioned composite steel plates, but still no actual guidance.
Does anyone know how to calculate the longitudinal shear in this case?
I am trying to design steel-concrete encased composite beam, more precisely a cast-in plate (in green, see drawing attached) inside a concrete beam. This is mainly to increase the shear capacity of the beam (it's a linking beam in a liftcore). To make steel and concrete act together we need to connect the two elements with studs (in blue) to transfer the longitudinal shear to prevent slippage between the two. It is easy to calculate it for the common composite beam with the concrete slab above the steel beam flange (the classic V*Ay/I), but in this case I am a bit puzzled, I don't really know how to calculate it because it's not merely connecting a flange to a web but two separate members on the same neutral axis.
I had a look if there was any guidance in the EC4 design guides for partially encased composite beams (which would have a similar situation in the shear flow calculation) but couldn't find anything. In the EC4 part 2 (Composite design for Bridges) it is even mentioned composite steel plates, but still no actual guidance.
Does anyone know how to calculate the longitudinal shear in this case?
