Find the joint deflection and member stress due to a
joint load in a plane truss.
Reference
Timoshenko, S.,
Strength of Materials, Part 1, D. Van Nostrand
Co., Inc., 3rd edition, 1956, page 10, problem 2.
Problem
Determine the vertical deflection at point A and the member
stresses
Model of two member
truss
Comparison
Table 1. Comparison of results
Result Type
|
Theory
|
STAAD.Pro
|
Difference
|
σA
(psi)
|
10,000.
|
10,000.
|
none
|
δA
(in)
|
0.12
|
0.12
|
none
|
STAAD Output
JOINT DISPLACEMENT (INCH RADIANS) STRUCTURE TYPE = TRUSS
------------------
JOINT LOAD X-TRANS Y-TRANS Z-TRANS X-ROTAN Y-ROTAN Z-ROTAN
1 1 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
2 1 0.00000 -0.12000 0.00000 0.00000 0.00000 0.00000
3 1 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
************** END OF LATEST ANALYSIS RESULT **************
32. PRINT MEMBER STRESSES
MEMBER STRESSES
: STRESS IN TRUSS -- PAGE NO. 4
MEMBER STRESSES
---------------
ALL UNITS ARE POUN/SQ INCH
MEMB LD SECT AXIAL BEND-Y BEND-Z COMBINED SHEAR-Y SHEAR-Z
1 1 .0 10000.0 T 0.0 0.0 10000.0 0.0 0.0
1.0 10000.0 T 0.0 0.0 10000.0 0.0 0.0
2 1 .0 10000.0 T 0.0 0.0 10000.0 0.0 0.0
1.0 10000.0 T 0.0 0.0 10000.0 0.0 0.0