V. 2D Portal Reactions 2
Find the maximum moment due to a uniform load on the horizontal member in a 1x1 bay plane frame.
Reference
McCormac, J. C., Structural Analysis, Intext Educational Publishers, 3rd edition, 1975, page 383, example 22 - 5.
Problem
Determine the maximum moment in the frame.
E and I same for all members.
L = 20 ft
w = 2 kips/ft
STAAD Input
The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\Samples\ Verification Models\03 Frames\2D Portal Reactions 2.STD is typically installed with the program.
STAAD PLANE : 2D PORTAL REACTIONS
START JOB INFORMATION
ENGINEER DATE 17-Sep-18
END JOB INFORMATION
*
* REFERENCE 'STRUCTURAL ANALYSIS' BY JACK C. McCORMACK,
* PAGE 383 EXAMPLE 22-5, PLANE FRAME WITH NO SIDESWAY
* ANSWER - MAX BENDING = 44.4 FT-KIP
*
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 0 20 0; 3 20 20 0; 4 20 0 0;
MEMBER INCIDENCES
1 1 2; 2 2 3; 3 3 4;
MEMBER PROPERTY AMERICAN
1 TO 3 PRIS AX 1 IZ 0.05
DEFINE MATERIAL START
ISOTROPIC MATERIAL1
E 4.132e+06
POISSON 0.3
END DEFINE MATERIAL
CONSTANTS
MATERIAL MATERIAL1 ALL
SUPPORTS
1 4 FIXED
LOAD 1
MEMBER LOAD
2 UNI Y -2
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 20.00 -3.33 0.00 0.00 0.00 -22.21 2 -20.00 3.33 0.00 0.00 0.00 -44.44 2 1 2 3.33 20.00 0.00 0.00 0.00 44.44 3 -3.33 20.00 0.00 0.00 0.00 -44.44 3 1 3 20.00 3.33 0.00 0.00 0.00 44.44 4 -20.00 -3.33 0.00 0.00 0.00 22.21