I have to model a 6x3M weighbridge structure using plates and U beams. U beam is made using 'create user table' option. The structure is supported in all four corners with fixed support and load is applied on top plate. I have created mesh using plate element for top plate and beam element for U beam. The beam elements has been splited in such a way that these nodes are aligned with the nodes belonging to the top plate mesh. I have used master slave connections with the nodes at the beam center line as the master nodes and the corresponding nodes at the top plate as the slave nodes. Rigid option is used to define these master slave connections. The code used is IS800.
Same model I have simulated in solidworks and results are different. With solidworks, the results are more realistic.
My question is what could be the reason for the difference in results. Is there any parameter I am missing in staad model?