Special Loading Conditions | Structural Analysis - Civil Engineering (CE) PDF Download

 Page 1


Special Loading Conditions
• Can be recognized by using specialized 
co-ordinate axes
Page 2


Special Loading Conditions
• Can be recognized by using specialized 
co-ordinate axes
Analysis of Trusses by the Method of Sections
• When the force in only one member 
or the forces in a very few members 
are desired, the method of sections 
works well.
• To determine the force in member BD, 
pass a section through the truss as 
shown and create a free body diagram 
for the left side (or right side).
• With only three members cut by the 
section, the equations for static 
equilibrium may be applied to 
determine the unknown member 
forces, including F
BD
.
26
Page 3


Special Loading Conditions
• Can be recognized by using specialized 
co-ordinate axes
Analysis of Trusses by the Method of Sections
• When the force in only one member 
or the forces in a very few members 
are desired, the method of sections 
works well.
• To determine the force in member BD, 
pass a section through the truss as 
shown and create a free body diagram 
for the left side (or right side).
• With only three members cut by the 
section, the equations for static 
equilibrium may be applied to 
determine the unknown member 
forces, including F
BD
.
26
Problem 1
• Using method of joints, determine the forces in 
the members of the trusses shown 
Page 4


Special Loading Conditions
• Can be recognized by using specialized 
co-ordinate axes
Analysis of Trusses by the Method of Sections
• When the force in only one member 
or the forces in a very few members 
are desired, the method of sections 
works well.
• To determine the force in member BD, 
pass a section through the truss as 
shown and create a free body diagram 
for the left side (or right side).
• With only three members cut by the 
section, the equations for static 
equilibrium may be applied to 
determine the unknown member 
forces, including F
BD
.
26
Problem 1
• Using method of joints, determine the forces in 
the members of the trusses shown 
Problem 2
• For the given loading , determine the 
zero force member in the truss shown 
Page 5


Special Loading Conditions
• Can be recognized by using specialized 
co-ordinate axes
Analysis of Trusses by the Method of Sections
• When the force in only one member 
or the forces in a very few members 
are desired, the method of sections 
works well.
• To determine the force in member BD, 
pass a section through the truss as 
shown and create a free body diagram 
for the left side (or right side).
• With only three members cut by the 
section, the equations for static 
equilibrium may be applied to 
determine the unknown member 
forces, including F
BD
.
26
Problem 1
• Using method of joints, determine the forces in 
the members of the trusses shown 
Problem 2
• For the given loading , determine the 
zero force member in the truss shown 
Problem 3
1. A Fink roof truss is loaded as shown in Fig 5. Use 
method of section to determine the force in members 
(a) BD, CD, and CE (b) FH, FG, EG