Internal Equillibrium Flashcards
What are the resulting forces necessary to keep the structure in equilibrium from the loads?
reaction forces
External loads result in ___ demands. (stresses and strains)
internal
What is A resultant force acting through the centroid of all resisting cross-sections?
Axial force
What is an axial force?
A resultant force acting through the centroid of all resisting cross-sections
What is A resultant force acting parallel or “tangential” to the cross section?
Shear force
What is a shear force?
A resultant force acting parallel or “tangential” to the cross section
What is A resultant internal couple acting on the cross-section?
A bending moment or flexural
What is a bending moment?
A resultant internal couple acting on the cross-section
What are the three internal reactions required for equilibrium at any cut in a beam?
axial force, shear force, bending moment
Which directions are the shear force and bending moment sign directions?
(+)
M: bending upward like a smile
V: left side up, right side down (like reading left to right)
(-)
M:bending downward like a frown
V:left side down, right side up
Draw the shear diagram
If there is no loads will the shear force change?
No
How will a point load affect a shear diagram?
An abrupt (vertical) change in shear with the value and direction of load
How will a uniform affect a shear diagram?
Change in shear with the linear slope matching the value and direction of uniform load
How will a concentrated moment affect a shear diagram?
No change in shear
Draw the moment diagram
