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7/21/2019 ConBeamU
http://slidepdf.com/reader/full/conbeamu 1/1
Fixed and Restrained End Actions by Macaulay's Method
Note: For comparison purposes, Examples 1 to 11 use the beam defined below.
The results from the standard formulae will be identical to the FEA function results, as long as identical input values are maintained
Effectively fixed end conditions have been used for the REA function for comparison with the FEA function results
Beam Segments Supports Support Stiffness
X End EI X Translation Rotation
m kN.m2 m kN/m kN.m/r
10,00 1666667 0,0 0,00E+00 1,00E+12
10,0 0,00E+00 1,00E+12
Examples:Both ends fixed (Formulas and diagrams from Formulas for Stress, Strain, and Structural Matrices, Walter D. Pilkey)1 ‐ Uniform Distributed Load
End Restraints
Start End Load/m Start Load/m End Position Force Moment
mm mm N/mm N/mm mm kN kNm
0 10000 ‐100 ‐100 0 0,00 0,00 11
P ‐6,852176586 kipf/ft
L 32,80839895 ft
Mom ent P *L 2̂/12
R ea ct io n P *L/ 2
Fixed End Actions Restrained End Actions
Moment Force Moment Force Moment Force
kNm kN kNm kN kNm kN
833,33 500,00 ‐
833,33 ‐
500,00 833,33 500,00‐833,33 500,00 833,33 ‐500,00 ‐833,33 500,00
2 ‐ Triangular Distributed Load
End Restraints
Start End Load/m Start Load/m End Position Force Moment
m ft kN/m lbf/ft m kN kNm
0 32,80839895 0 ‐6850 0 0 0,0000E+00 11
P ‐6850 lbf/ft
L 32,80839895 ft
Moment ‐P*L 2̂/30 P*L^2/20
Reaction ‐P*L*3/20 ‐P*L*7/20
Fixed End Actions Restrained End Actions
Moment Force Moment Force Moment Forcelbf ft lbf lbf ft lbf lbf ft lbf
245775,95 33710,63 245775,95 33710,63 245775,91 33710,63
‐368663, 93 78658,14 ‐3 68 66 3, 93 7 86 58 ,1 4 ‐368 663 ,7 7 78 658 ,1 3
3 ‐ Moment
End Restraints
Start End Load/m Start Load/m End Position Force Moment
m in kN/m kN/m in kip kip in
0 0 0 0 100 0 ‐500,00 11
M ‐500,00 kip in
L 393,7007874 in
Alpha 100 in
Moment L M/L 2̂*(4*L*Alpha‐3*Alpha^2‐L^2)
Moment R M/L 2̂*(2*L*Alpha‐3*Alpha^2)
Reaction 6*M/L 3̂*(Alpha*L‐Alpha^2)
Fixed End Actions L 3,9370E +02 i n Restrained End Actions
Distributed Loads Point Loads
FEA Results Formula Results
Distributed Loads Point Loads
REA Results
FEA Results Formula Results
Distributed Loads Point Loads
REA Results