V. 2D Portal Reactions Sidesway 2
Find the maximum moment due to a concentrated load on the horizontal member in a 1x1 bay plane frame.
Reference
McCormac, J. C., Structural Analysis, Intext Educational Publishers, 3rd edition, 1975, page 385, problem 22 - 6.
Problem
Determine the maximum moment in the structure.
| P = 30 kip |
| L1 = 20 ft, L2 = 30 ft |
E and I same for all members
Unequal leg bay model
Comparison
| Result Type | Theory | STAAD.Pro | Difference |
|---|---|---|---|
| MMax (ft·kip) | 69.40 | 69.44 | negligible |
STAAD Input
The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\Samples\ Verification Models\03 Frames\2D Portal Reactions Sidesway 2.STD is typically installed with the program.
STAAD PLANE : 2D PORTAL REACTIONS SIDEWAYS
START JOB INFORMATION
ENGINEER DATE 17-Sep-18
END JOB INFORMATION
*
* PLANE FRAME WITH SIDESWAY. REFERENCE 'STRUCTURAL ANALYSIS'
* BY JACK McCORMACK. PAGE 385 PROB 22-6.
* ANSWER - MAX BENDING IN MEMB 1 = 69.4 KIP-FT
*
UNIT FEET KIP
JOINT COORDINATES
1 0 10 0; 2 0 30 0; 3 30 30 0; 4 30 0 0;
MEMBER INCIDENCES
1 1 2; 2 2 3; 3 3 4;
MEMBER PROPERTY AMERICAN
1 TO 3 TABLE ST W12X26
DEFINE MATERIAL START
ISOTROPIC MATERIAL1
E 4.176e+06
POISSON 0.3
END DEFINE MATERIAL
CONSTANTS
MATERIAL MATERIAL1 ALL
SUPPORTS
1 4 FIXED
LOAD 1 VERTICAL LOAD
MEMBER LOAD
2 CON Y -30 10
PERFORM ANALYSIS
PRINT MEMBER FORCES
FINISH
STAAD Output
MEMBER END FORCES STRUCTURE TYPE = PLANE ----------------- ALL UNITS ARE -- KIP FEET (LOCAL ) MEMBER LOAD JT AXIAL SHEAR-Y SHEAR-Z TORSION MOM-Y MOM-Z 1 1 1 20.09 -3.74 0.00 0.00 0.00 -5.33 2 -20.09 3.74 0.00 0.00 0.00 -69.44 2 1 2 3.74 20.09 0.00 0.00 0.00 69.44 3 -3.74 9.91 0.00 0.00 0.00 -66.66 3 1 3 9.91 3.74 0.00 0.00 0.00 66.66 4 -9.91 -3.74 0.00 0.00 0.00 45.50