Composite floor modeling in SAP2000
Composite floor modeling in SAP2000
(OP)
Hi everyone,
I am currently working on a steel building with composite floors. My problem is that I don't know how to model the connection between the steel beam and the concrete slab (i.e. modelling the shear studs). Even if I put any constraint to the floor joints, SAP2000 does not consider the beams to be braced on their entire length (the unbraced length factor defined by the software is 1) and therefore I get an error message when checking the design (lateral-tosional buckling).
I know I can change the unbraced length factor manually in the overwrites, but I wanted to know if there was a more "realistic" way of modelling composite floors.
Thanks
I am currently working on a steel building with composite floors. My problem is that I don't know how to model the connection between the steel beam and the concrete slab (i.e. modelling the shear studs). Even if I put any constraint to the floor joints, SAP2000 does not consider the beams to be braced on their entire length (the unbraced length factor defined by the software is 1) and therefore I get an error message when checking the design (lateral-tosional buckling).
I know I can change the unbraced length factor manually in the overwrites, but I wanted to know if there was a more "realistic" way of modelling composite floors.
Thanks





RE: Composite floor modeling in SAP2000
Add joints at the location of the shear studs; these points should be on both the frames and the slab shell. Now select the slab shell and assign automatic area meshing based on the point intersections: Select Slab > Assign > Area > Automatic Area Mesh > Mesh Area Based on Points On Area Edges > Check both intersection of straight lines objects and point objects.
RE: Composite floor modeling in SAP2000
RE: Composite floor modeling in SAP2000
Assign >> Area >> Generate Edge Constraints
RE: Composite floor modeling in SAP2000
The probelm with composite slabs would be their design since it is not supported. So you can do that in hand after getting the internal forces at the span of the composite beams, apply moment redistributions etc.
Rgs.
Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis
http://www.engissol.com/cross-section-analysis-des...
RE: Composite floor modeling in SAP2000
RE: Composite floor modeling in SAP2000
- The shear connection layout. An I mean whther the studs placement pattern and count and able to carry the developed longitudinal shear between concrete and steel
- The slab thickness. Imagine a thin slab and a relatively thick beam. Then the slab will provide a restraint to beam against buckling or vice versa?
Have a nice day.Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis
http://www.engissol.com/cross-section-analysis-des...
RE: Composite floor modeling in SAP2000
RE: Composite floor modeling in SAP2000
Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis
http://www.engissol.com/cross-section-analysis-des...
RE: Composite floor modeling in SAP2000