Statics

Question 1

In the method of joints and method of sections how do we solve forces of the structure

Answer 1

By resolving internal forces by isolating part of the structure

Question 2

What are the three types of class of pin joints for truss diagrams?

Answer 2

Mechanism-more equilibrium equations than unknown forces or reactions, unstable system
Statically determinate-equal number of equilibrium equations as unknown forces or reactions
Statically indeterminate-less equilibrium equations than unknown forces or reactions

Question 3

For what type of pin joint system can the whole problem be solved only with method of joints/sections?

Answer 3

If system is statically determinate, we can solve the whole
problem using the method of joints or method of sections

Question 4

What are the three conditions/rules for pin joints structures in truss deformation (use ARA)

Answer 4

-bars extend or compress axially
-bars are free to rotate about the pin joints
-bars always remain attached to each other at the joints