This document discusses calculating the total strain or change in length of bars of different lengths and diameters that are subjected to the same loading. It explains that the total change in length is the sum of the changes in each bar, which can be calculated using simple equations involving the force, length, diameter, modulus of elasticity, and cross-sectional area of each bar. Free body diagrams and dividing the load based on equilibrium conditions are also recommended.

2. A BAR OF DIFFERENT LENGTH AND DIAMETER GIVEN IN THIS TYPE OF PROBLEMS
AND ALL ARE SUBJECTED TO SAME LOADING.HERE WE HAVE FIND OUT THE TOTAL
STRAIN OR CHANGE IN LENGTH BY USING SIMPLE EQUATIONS.
FORCE=P
L1 L2 L3
D1 D2 D3FORCE=P
L1
L2
L3
FORCE=P
D1
D2
D3
321 DLDLDLDL 
TOTAL CHANGE IN LEGTH=SUM OF THE CHANGE IN LENGTH IN ALL BARS
33
3
3
EA
PL
DL 
11
1
1
EA
PL
DL 
22
2
2
EA
PL
DL 

6. WE CAN DRAW THE FREE BODY DIAGRAMS OF EACH SECTIONS.
AND ALSO CAN DIVIDE THE LOAD IN EQUILIBRIUM CONDITIONS.
33
3
3
EA
PL
DL 
11
1
1
EA
PL
DL 
22
2
2
EA
PL
DL 