Please explain if possible, the middle support (PIN) should have a resultant moment, isn't it? Because intuitively, P is pushing down, the PIN won't settle and the wall won't let move up either. So, there should be a bending effect on the PIN.
Can you please add how to draw the shear and beding daigram. I am not sure how the reaction force and the applied force are applied withing the shear daigram.
