EX. US-13 Section Displacements for a Frame
Calculation of displacements at intermediate points of members of a plane frame is demonstrated in this example.
This problem is installed with the program by default to C:\Users\Public\Public Documents\STAAD.Pro 2024\Samples \Sample Models\US\US-13 Section Displacements for a Frame.STD when you install the program.
Where:
- L1 = 15 ft, L2 =20 ft
- P = 5.0 k
- w = 3.0 k/ft
The dashed line represents the deflected shape of the structure. The shape is generated on the basis of displacements at the ends plus several intermediate points of the members.
Actual input is shown in bold lettering followed by explanation.
STAAD PLANE TEST FOR SECTION DISPLACEMENT
Every input has to start with the term STAAD
. The term PLANE
signifies that the structure is a plane frame structure and the geometry is defined through X and Y axes.
UNIT KIP FEET
Defines the input units for the data that follows.
JOINT COORDINATES
1 0. 0. ; 2 0. 15. ; 3 20. 15. ; 4 20. 0.
Joint number followed by X and Y coordinates are provided above. Since this is a plane structure, the Z coordinates need not be provided.
MEMBER INCIDENCE
1 1 2 ; 2 2 3 ; 3 3 4
Defines the members by the joints to which they are connected.
MEMBER PROPERTY AMERICAN
1 3 TABLE ST W8X18
2 TABLE ST W12X26
Properties for all members are assigned from the American AISC steel table. The word ST
stands for standard single section.
UNIT INCHES
DEFINE MATERIAL START
ISOTROPIC STEEL
E 29000.0
POISSON 0.3
DENSITY 283e-006
ALPHA 6e-006
DAMP 0.03
TYPE STEEL
STRENGTH FY 36 FU 58 RY 1.5 RT 1.2
END DEFINE MATERIAL
CONSTANT
MATERIAL STEEL ALL
The input units are changed from FT to INCH. The DEFINE MATERIAL
command is used to specify material properties and the CONSTANT
is used to assign the material to all members.
SUPPORT
1 FIXED ; 4 PINNED
A fixed support is specified at Joint 1 and a pinned support at Joint 4.
UNIT FT
LOADING 1 DEAD + LIVE + WIND
Load case 1 is initiated followed by an optional title.
JOINT LOAD
2 FX 5.
Load 1 contains a joint load of 5 kips at node 2.
FX
indicates that the load is a force in the global X direction.
MEMBER LOAD
2 UNI GY -3.0
Load 1 contains a member load also. GY
indicates that the load is in the global Y direction. The word UNI
stands for uniformly distributed load.
PERFORM ANALYSIS
This command instructs the program to proceed with the analysis.
PRINT MEMBER FORCES
The above PRINT
command is self-explanatory.
*
* FOLLOWING PRINT COMMAND WILL PRINT
* DISPLACEMENTS OF THE MEMBERS
* CONSIDERING EVERY TWELFTH INTERMEDIATE
* POINT (THAT IS TOTAL OF 13 POINTS). THESE
* DISPLACEMENTS ARE MEASURED IN GLOBAL X
* Y Z COORDINATE SYSTEM AND THE VALUES
* ARE FROM ORIGINAL COORDINATES (UNDEFLECTED
* POSITION) OF CORRESPONDING TWELFTH
* POINTS.
*
* MAX LOCAL DISPLACEMENT IS ALSO PRINTED.
* THE LOCATION OF MAXIMUM INTERMEDIATE
* DISPLACEMENT IS DETERMINED. THIS VALUE IS
* MEASURED FROM ABOVE LOCATION TO THE
* STRAIGHT LINE JOINING START AND END
* JOINTS OF THE DEFLECTED MEMBER.
*
PRINT SECTION DISPLACEMENT
Above PRINT command is explained in the comment lines above.
FINISH
This command terminates the STAAD run.
Input File
STAAD PLANE TEST FOR SECTION DISPLACEMENT
UNIT KIP FEET
JOINT COORDINATES
1 0. 0. ; 2 0. 15. ; 3 20. 15. ; 4 20. 0.
MEMBER INCIDENCE
1 1 2 ; 2 2 3 ; 3 3 4
MEMBER PROPERTY AMERICAN
1 3 TABLE ST W8X18
2 TABLE ST W12X26
UNIT INCHES
DEFINE MATERIAL START
ISOTROPIC STEEL
E 29000.0
POISSON 0.3
DENSITY 283e-006
ALPHA 6e-006
DAMP 0.03
TYPE STEEL
STRENGTH FY 36 FU 58 RY 1.5 RT 1.2
END DEFINE MATERIAL
CONSTANT
MATERIAL STEEL ALL
SUPPORT
1 FIXED ; 4 PINNED
UNIT FT
LOADING 1 DEAD + LIVE + WIND
JOINT LOAD
2 FX 5.
MEMBER LOAD
2 UNI GY -3.0
PERFORM ANALYSIS
PRINT MEMBER FORCES
*
* FOLLOWING PRINT COMMAMND WILL PRINT DISPLACEMENTS
* OF THE MEMBERS CONSIDERING EVERY TWELVETH INTERMEDIATE
* POINTS (THAT IS TOTAL 13 POINTS). THESE DISPLACEMENTS
* ARE MEASURED IN GLOBAL X Y Z COORDINATE SYSTEM AND
* THE VALUES ARE FROM ORIGINAL COORDINATES (THAT IS
* UNDEFLECTED) OF CORRESPONDING TWELVETH POINTS.
*
* MAX LOCAL DISPLACEMENT IS ALSO PRINTED. THE LOCATION
* OF THE MAXIMUM INTERMEDIATE DISPLACEMENT IS DETERMINED.
* THIS VALUE IS MEASURED FROM ABOVE LOCATION TO THE STRAIGHT
* LINE JOINING START AND END JOINTS OF THE DEFLECTED MEMBER.
*
PRINT SECTION DISPLACEMENT
FINISH
PAGE NO. 1
****************************************************
* *
* STAAD.Pro 2023 *
* Version 23.00.03.** *
* Proprietary Program of *
* Bentley Systems, Inc. *
* Date= JUL 4, 2024 *
* Time= 11:24:59 *
* *
* Licensed to: Bentley Systems Inc *
****************************************************
1. STAAD PLANE TEST FOR SECTION DISPLACEMENT
INPUT FILE: D:\Documentation\STAAD.Pro\_Automated_Py\output\2024-07-04\SPro_Output_Input_Files\Sample .. .STD
2. UNIT KIP FEET
3. JOINT COORDINATES
4. 1 0. 0. ; 2 0. 15. ; 3 20. 15. ; 4 20. 0.
5. MEMBER INCIDENCE
6. 1 1 2 ; 2 2 3 ; 3 3 4
7. MEMBER PROPERTY AMERICAN
8. 1 3 TABLE ST W8X18
9. 2 TABLE ST W12X26
10. UNIT INCHES
11. DEFINE MATERIAL START
12. ISOTROPIC STEEL
13. E 29000.0
14. POISSON 0.3
15. DENSITY 283E-006
16. ALPHA 6E-006
17. DAMP 0.03
18. TYPE STEEL
19. STRENGTH FY 36 FU 58 RY 1.5 RT 1.2
20. END DEFINE MATERIAL
21. CONSTANT
22. MATERIAL STEEL ALL
23. SUPPORT
24. 1 FIXED ; 4 PINNED
25. UNIT FT
26. LOADING 1 DEAD + LIVE + WIND
27. JOINT LOAD
28. 2 FX 5.
29. MEMBER LOAD
30. 2 UNI GY -3.0
31. PERFORM ANALYSIS
TEST FOR SECTION DISPLACEMENT -- PAGE NO. 2
P R O B L E M S T A T I S T I C S
-----------------------------------
NUMBER OF JOINTS 4 NUMBER OF MEMBERS 3
NUMBER OF PLATES 0 NUMBER OF SOLIDS 0
NUMBER OF SURFACES 0 NUMBER OF SUPPORTS 2
Using 64-bit analysis engine.
SOLVER USED IS THE IN-CORE ADVANCED MATH SOLVER
TOTAL PRIMARY LOAD CASES = 1, TOTAL DEGREES OF FREEDOM = 7
TOTAL LOAD COMBINATION CASES = 0 SO FAR.
32. PRINT MEMBER FORCES
MEMBER FORCES
TEST FOR SECTION DISPLACEMENT -- PAGE NO. 3
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 27.37 0.97 0.00 0.00 0.00 22.49
2 -27.37 -0.97 0.00 0.00 0.00 -7.88
2 1 2 4.03 27.37 0.00 0.00 0.00 7.88
3 -4.03 32.63 0.00 0.00 0.00 -60.39
3 1 3 32.63 4.03 0.00 0.00 0.00 60.39
4 -32.63 -4.03 0.00 0.00 0.00 0.00
************** END OF LATEST ANALYSIS RESULT **************
33. *
34. * FOLLOWING PRINT COMMAMND WILL PRINT DISPLACEMENTS
35. * OF THE MEMBERS CONSIDERING EVERY TWELVETH INTERMEDIATE
36. * POINTS (THAT IS TOTAL 13 POINTS). THESE DISPLACEMENTS
37. * ARE MEASURED IN GLOBAL X Y Z COORDINATE SYSTEM AND
38. * THE VALUES ARE FROM ORIGINAL COORDINATES (THAT IS
39. * UNDEFLECTED) OF CORRESPONDING TWELVETH POINTS.
40. *
41. * MAX LOCAL DISPLACEMENT IS ALSO PRINTED. THE LOCATION
42. * OF THE MAXIMUM INTERMEDIATE DISPLACEMENT IS DETERMINED.
43. * THIS VALUE IS MEASURED FROM ABOVE LOCATION TO THE STRAIGHT
44. * LINE JOINING START AND END JOINTS OF THE DEFLECTED MEMBER.
45. *
46. PRINT SECTION DISPLACEMENT
SECTION DISPLACE
TEST FOR SECTION DISPLACEMENT -- PAGE NO. 4
MEMBER SECTION DISPLACEMENTS
----------------------------
UNITS ARE - INCH
MEMB LOAD GLOBAL X,Y,Z DISPL FROM START TO END JOINTS AT 1/12TH PTS
1 1 0.0000 0.0000 0.0000 0.0173 -0.0027 0.0000
0.0666 -0.0054 0.0000 0.1461 -0.0081 0.0000
0.2539 -0.0108 0.0000 0.3882 -0.0135 0.0000
0.5472 -0.0162 0.0000 0.7290 -0.0188 0.0000
0.9318 -0.0215 0.0000 1.1538 -0.0242 0.0000
1.3931 -0.0269 0.0000 1.6480 -0.0296 0.0000
1.9165 -0.0323 0.0000
MAX LOCAL DISP = 0.41112 AT 90.00 LOAD 1 L/DISP= 437
2 1 1.9165 -0.0323 0.0000 1.9162 -0.3903 0.0000
1.9158 -0.7221 0.0000 1.9154 -1.0010 0.0000
1.9151 -1.2067 0.0000 1.9147 -1.3260 0.0000
1.9144 -1.3523 0.0000 1.9140 -1.2856 0.0000
1.9136 -1.1331 0.0000 1.9133 -0.9082 0.0000
1.9129 -0.6316 0.0000 1.9125 -0.3303 0.0000
1.9122 -0.0385 0.0000
MAX LOCAL DISP = 1.31688 AT 120.00 LOAD 1 L/DISP= 182
3 1 1.9122 -0.0385 0.0000 2.0720 -0.0353 0.0000
2.1486 -0.0321 0.0000 2.1495 -0.0289 0.0000
2.0822 -0.0257 0.0000 1.9544 -0.0225 0.0000
1.7736 -0.0192 0.0000 1.5474 -0.0160 0.0000
1.2833 -0.0128 0.0000 0.9890 -0.0096 0.0000
0.6719 -0.0064 0.0000 0.3398 -0.0032 0.0000
0.0000 0.0000 0.0000
MAX LOCAL DISP = 0.83895 AT 75.00 LOAD 1 L/DISP= 214
************ END OF SECT DISPL RESULTS ***********
47. FINISH
TEST FOR SECTION DISPLACEMENT -- PAGE NO. 5
*********** END OF THE STAAD.Pro RUN ***********
**** DATE= JUL 4,2024 TIME= 11:25: 0 ****
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