We use the method of joints when the members on which the force to be found are few in number.
The method of section cuts the whole structure of trusses into section and then uses the cut out portion for the calculations.
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The method of joints helps us to find out the unknown force in the trusses joint. And the method of section helps us to make the calculation of the direction of the zero members.
Method of section cuts the whole structure of trusses into section and then uses the cut out portion for the calculations of the unknown forces. For this method, at most two forces must be collinear.
The determination of the truss’s support reaction is done first and then the section is isolated for the method of the section.
Why the determination of the support reaction needs to be done before isolating the section?
The free diagram of the section of the truss is made for the section having the least number of the forces. This is done as to make the calculations easy.
We have three method to solve for the unknown force in the trusses. They are method of section, method of joints and rotational vector method.
The free body diagram of which part of the section of the truss is made to make use of method of sections?
The system of the collinear and the parallel force are simplified as:
The couple and the other two force systems can be easily simplified.
The resultant force is equal to the _______ of all the forces.