ในส่วนนี้จะเป็นการคำนวณหา Reactions และ Internal forces (axial forces) ดังนี้: Determine axial forces in each member of Pin-jointed truss  illustrated below: การคำนวณ: 1. Determine supported reactions. -Applying three static equilibrium equations. Summation of forces and moment, thus reaction at the supported are: Joint A: Horizontal reaction = +20 kN and there is no vertical reaction, because of [...]