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440:221 Intro to Engineering Mechanics: Statics
Instructor: Alberto Cuitino
TA: Pam Carabetta and Jingru Zhang
Lecture 18
Fall 2009
1
Based on Textbook Material: Engineering Mechanics Statics, 12
th
Edition, R.C. Hibbeler, Pearson 2010.
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ethod of the
ections
Method of the sections
School of Engineering, Fall 2009
2
440:221 Lectures
opics to be covered
Topics to be covered
• What is the method of the sections?
• Why do we need another method if the method of the joints
gives the solution for all members?
•
ow
o we analyze simple truss structures using the method
How do we analyze simple truss structures using the method
of the section?
School of Engineering, Fall 2009
3
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eading Quiz
1. In the method of sections, generally a “cut” passes through no more than
_____ members in which the forces are unknown.
Reading Quiz
A)
1
B)
2
C)
3
D)
4
If a simple truss member carries a tensile force of T along its length then the
B)
C)
2. If a simple truss member carries a tensile force of T along its length, then the
internal force in the member is
______ .
A)
Tensile with magnitude of T/2
B)
Compressive with magnitude of T/2
)p
g
C)
Compressive with magnitude of T
D)
Tensile with magnitude of T
D)
School of Engineering, Fall 2009
440:221 Lectures
pplications
Applications
Long trusses are often used to construct large cranes and large
lectrical transmission towers
electrical transmission towers.
The method of joints requires that many joints be analyzed before we can
determine the forces in the middle part of a large truss.
o we need another method to determine such forces
School of Engineering, Fall 2009
So we need another method to determine such forces.
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he method of the sections
The method of the sections
In the method of sections,
a truss is divided into two parts
by taking an
imaginary “cut” (shown here as aa) through the truss.
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This note was uploaded on 09/12/2011 for the course ENG 221 taught by Professor P.sannuti during the Fall '09 term at Rutgers.
 Fall '09
 P.Sannuti
 Statics

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