The picture above shows two walls with lintel beam. One of the model used rigid surface to connect the wall to lintel beam while the other one has direct connect)no rigid surface). result of NY internal force are shown, from the line release diagram result in the other picture, I assume that the wall-lintel beam with rigid surface connector shows a better realistic result than the other one.
Pls can someone Inspect this for me
Hello and thank you for your interesting question! 
You have compared two different modeling approaches—and that is a very good way to better understand the effects of modeling. 
If I interpret your description correctly:
The use of a rigid surface massively overestimates the actual stiffness. The results of this modeling are not usable.
The right variant, in which a beam is used above the window opening, more accurately reflects the actual stiffness conditions of the lintel beam.
If you like, you can also upload your model – then we can take a look at it together. 
Good luck with your work! 
Frank
Thanks for your response but in the left model the rigid surface is not used as lintel beam. It is use an a connector between the masonry wall and the lintel beam. Remember the lintel is just a wireframe, so looking at the model the lintel beam is surrounded with two rigid surface by its sides
The problem with the model on the left is that the rigid surfaces create a very high additional bending stiffness around the local y-axis of the member. This does not exist in reality.
It would be better to model the lintel using a concrete beam with realistic bending stiffness.
