Interactive Sample Project: Pedestrian Bridge

Step 6: Design Analysis: Determine Stress Formula

Description of Symbols

σ	normal stress
M	bending moment
c	maximum distance from the neutral axis
I	moment of inertia
P	force
A	area
τ	shear stress
T	Torsion
J	polar moment of inertia
V	resultant shear force
Q	first moment of the area
t	width of cross section

Pick the correct stress formula that will be used to analyze the beam.

		This is the flexure formula used to find the normal stress caused by bending. This is the correct choice.
		This formula is used to find the average normal stress caused by axial load. This choice is incorrect.
		This formula is used to find the shear stress in shafts and tubes caused by a torsional moment. This choice is incorrect.
		This formula is used to find the shear stress in beams caused by transverse shear forces. This choice is incorrect.

< < Back to Step 5: Analysis: Moment Diagrams Continue to Step 7: Design Analysis: Determine Required Section Modulus >>

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This material is based upon work supported by the National Science Foundation under Grant No. 0633602. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).

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