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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