Vertical Force Calculation

Dear CEian,

I would like to ask weather there is a possible chance tat i can calculate vertical forces rather than horizontal force? by my understanding, horizontal force is just like bending moment on a beam or deflections, so from there you could find the force. but on vertical situation, how does it calculate? i ran through all books and could find 1. please help. i along here attach a drawing for understanding. Please help me with the formula.