I want to know load taken by raft and pile when uniform distributed load is acting?

Question

I have taken raft as plate element and pile as embedded beam, the load applied is 100kN/m2. which output should i take to find the load shared by the raft and pile. 
 if we take axial force then the output is in terms of kN/m for plate how to take it in terms of kN/m2 or kN ? 
 Question 2 is when i applied uniform distributed load the soil has to settle uniformly right but i can see one side settlement is more other side settlement is less? what is the reason? 
 
 in the above figure there is no uniform displacement 
 Question 3 is as i said i applied uniform surface load but in the below figure even though i applied surface load i can see a single force direction what might be reason for this?

Dennis Waterman · Accepted Answer

Hi, 
 1) Axial force in surface elements have the unit [force/length] because it's an axial force per meter width. Something with units kN/m2 is not an axial force but a stress, and units kN is an axial force in a 1-dimensional line element like a slender beam, not in a surface. 
 2) It's because the mesh is not symmetric. This leads to a non-symmetric stress and displacement distribution. Usually locally refining the mesh solves it. 
 3) In PLAXIS Input we don't draw all the arrows of a distributed load in order to not clutter the image too much. So usually one gets 2-3 arrows randomly placed, but sometims only 1 like in your case. 
 With kind regards, 
 Dennis Waterman

Dennis Waterman · Answer

1) If you refine the mesh it will become more symmstric. It's not possible to enforce a 100% symmetric mesh as we use a random mesh generator. 
 2) I really don't understand why you're looking at axial forces in the raft when you're interesting in how much top load is carried by the piles and the raft. I recommend you lookup in the manual what axial forces are... If you apply a total load A on the raft, and you know that the sum of the pile forces is B ....what would you think is the load that is transferred from the raft directly to the soil? (Hint: A - B) With kind regards, 
 Dennis Waterman

Dennis Waterman · Answer

1) Please thoroughly check the Reference and Material manuals on the meaning of Tskin and Fmax for embedded beams and you will understand why you get almost no force in the pile if you keep those values to zero. 
 2) I would suggest you find some literature on (design of) pile foundations to find out how they transfer load to the soil so that you understand why the axial force in the pile is not constant, but changes with depth. With the questions you ask I'm deeply worried about your understanding of pile foundations. 
 With kind regards, 
 Dennis Waterman