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TRUSSES AND ITS
APPLICATION
WHAT IS TRUSS ?
A truss is a structure comprising one or more triangular units constructed
with straight members whose en...
DIFFERENT TYPES OF TRUSSES
There are tree types of Trusses:-
 Perfect Trusses (m=2j-3)
 Deficient Trusses(m<2j-3)
 Redu...
1.PERFECT TRUSSES
 A Structure that is made of members just sufficient to
keep it in equilibrium, When loaded without cha...
2.DEFICIENT TRUSSES
 A structure that is made of members less than
sufficient that leads to change of shape when
load is ...
3.REDUNDANT TRUSSES
 A structure that is made of members more than
sufficient that doesn’t let the shape of the
structure...
IMAGES OF TRUSSES
ASSUMPTION IN TRUSSES
 All members are straight and have uniform cross section.
 All members have negligible weight.
 A...
TRUSS ANALYSIS
Following characteristics of Truss
* The members of the truss should be in a plane.
* Members are connected...
TRUSSANALYSIS
Application of trusses-
 Roof of factory shade.
 Ware house
 Railway platform
 Garage shed
 transmissi...
HOW TO SOLVE A TRUSS PROBLEM
For method of Section
 Draw a free body diagram.
 Take an imaginary section to cut the trus...
HOW TO SOLVE A TRUSS PROBLEM
For method of Joints
 Draw a free body diagram.
 Find the equilibrium of the truss that is
...
EXAMPLE OF A QUESTION
CONTINUE
CONTINUE
Done by :
Milan Joshi BE/50024/15
Bhairvi Singh BE/50036/15
Asman BE/50054/15
Trusses and its applications
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Trusses and its applications

ppt for enignerrng mechanics second semester

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Trusses and its applications

  1. 1. TRUSSES AND ITS APPLICATION
  2. 2. WHAT IS TRUSS ? A truss is a structure comprising one or more triangular units constructed with straight members whose ends are connected at joints or nodes. If all the bars lie in a plane, the structure is a planar truss. The main parts of a planar truss. TRUSS ANALYSIS  In other words, Trusses are designed to form a stable structure.
  3. 3. DIFFERENT TYPES OF TRUSSES There are tree types of Trusses:-  Perfect Trusses (m=2j-3)  Deficient Trusses(m<2j-3)  Redundant Trusses(m>2j-3) Here m=members j=joints
  4. 4. 1.PERFECT TRUSSES  A Structure that is made of members just sufficient to keep it in equilibrium, When loaded without change of shape.  m=2j-3  It is efficient and optimized structure.
  5. 5. 2.DEFICIENT TRUSSES  A structure that is made of members less than sufficient that leads to change of shape when load is added, leading to collapsing of structure.  m<2j-3  Not very efficient and optimized.
  6. 6. 3.REDUNDANT TRUSSES  A structure that is made of members more than sufficient that doesn’t let the shape of the structure to change.  m>2j-3  Very efficient and optimized.
  7. 7. IMAGES OF TRUSSES
  8. 8. ASSUMPTION IN TRUSSES  All members are straight and have uniform cross section.  All members have negligible weight.  All members are connected at joints through pin connection which are frictionless.  The external force must be applied at the joints.  All members have axial force.  Couple movements which produce bending do not act on the member of the truss.
  9. 9. TRUSS ANALYSIS Following characteristics of Truss * The members of the truss should be in a plane. * Members are connected at their intersections by means of frictionless pins or hinge. * Loads and reactions are applied only at joint. * The centroid of the members must coincide with centroid of the joints.
  10. 10. TRUSSANALYSIS Application of trusses-  Roof of factory shade.  Ware house  Railway platform  Garage shed  transmission towers  Crane truss  Bridge Truss  Sport Stadium Truss
  11. 11. HOW TO SOLVE A TRUSS PROBLEM For method of Section  Draw a free body diagram.  Take an imaginary section to cut the truss into two pieces in condition that the number of unknown forces doesn’t exceed three.  Apply equilibrium equations on one piece of the truss. ∑V=0, ∑H=0, ∑M=0.  After determining all the forces, positive forces are tension and the negative forces are compression.
  12. 12. HOW TO SOLVE A TRUSS PROBLEM For method of Joints  Draw a free body diagram.  Find the equilibrium of the truss that is ∑V=0, ∑H=0, ∑M=0.  Select the joint whose number of forces doesn’t exceed two and then study its equilibrium by using static equations. ∑V=0, ∑H=0.  Go to next joint and follow the same procedure.  The Horizontal equation will be Tension and the Vertical equation will be Compression.
  13. 13. EXAMPLE OF A QUESTION
  14. 14. CONTINUE
  15. 15. CONTINUE
  16. 16. Done by : Milan Joshi BE/50024/15 Bhairvi Singh BE/50036/15 Asman BE/50054/15

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