A frame is a structural system composed of interconnected beams and columns, while a truss is a structural system made up of interconnected members (usually in a triangular pattern) that are designed to carry loads primarily in tension and compression.
The reactions at the supports can be determined by using the equations of static equilibrium, which state that the sum of all forces in the x and y directions must equal zero and the sum of all moments must also equal zero. By setting up and solving these equations, the reactions at the supports can be found.
The method of sections is a technique used to analyze structures by cutting through a section of the structure and isolating the desired portion. By applying the equations of static equilibrium to this isolated portion, the internal forces and reactions at the supports can be determined.
The advantages of using the method of sections include its simplicity and ability to determine internal forces at specific points in the structure. However, it may not be suitable for complex structures and may not give an accurate representation of the overall behavior of the structure.
No, the method of sections is most commonly used for statically determinate structures, meaning that the forces in all members can be determined using static equilibrium equations. It may not be suitable for analyzing structures with moving loads, redundant supports, or other complex conditions.