EX. US-5 Support Settlement on a Portal Frame
This example demonstrates the application of support displacement load (also known as a sinking support) on a space frame structure.
This problem is installed with the program by default to C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\Samples\Sample Models\US\US-5 Support Settlement on a Portal Frame.STD when you install the program.
- L1 = 10 ft
- L2 = 20 ft
Actual input is shown in bold lettering followed by explanation.
STAAD SPACE TEST FOR SUPPORT DISPLACEMENT
Every input has to start with the term STAAD. The word SPACE signifies that the structure is a space frame structure (3-D) and the geometry is defined through X, Y and Z coordinates.
UNITS KIP FEET
Defines the input units for the data that follows.
JOINT COORDINATES 1 0.0 0.0 0.0 ; 2 0.0 10.0 0.0 3 20.0 10.0 0.0 ; 4 20.0 0.0 0.0 5 20. 10. 20. ; 6 20. 0. 20.
Joint number followed by X, Y and Z coordinates are provided above.
MEMBER INCIDENCE 1 1 2 3 4 3 5 ; 5 5 6
Defines the members by the joints to which they are connected.
UNIT INCH MEMB PROP 1 TO 5 PRIS AX 10. IZ 300. IY 300. IX 10.
Member properties have been defined above using the PRISMATIC attribute. Values of AX (area), IZ (moment of inertia about major axis), IY (moment of inertia about minor axis) and IX (torsional constant) are provided in INCH unit.
DEFINE MATERIAL START ISOTROPIC STEEL E 29000. 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
Material are defined using the DEFINE MATERIAL command and then assigned using the CONSTANT command.
SUPPORT 1 4 6 FIXED
Joints 1, 4 and 6 are fixed supports.
LOADING 1 SINKING SUPPORT
Load case 1 is initiated followed by a title.
SUPPORT DISPLACEMENT LOAD 4 FY -0.50
Load 1 is a support displacement load which is also commonly known as a sinking support. FY signifies that the support settlement is in the global Y direction and the value of this settlement is 0.5 inch downward.
PERFORM ANALYSIS
This command instructs the program to proceed with the analysis.
PRINT ANALYSIS RESULTS
The above PRINT command instructs the program to print joint displacements, support reactions and member forces.
FINISH
This command terminates the STAAD run.
Input File
STAAD SPACE TEST FOR SUPPORT DISPLACEMENT
UNITS KIP FEET
JOINT COORDINATES
1 0.0 0.0 0.0 ; 2 0.0 10.0 0.0
3 20.0 10.0 0.0 ; 4 20.0 0.0 0.0
5 20. 10. 20. ; 6 20. 0. 20.
MEMBER INCIDENCE
1 1 2 3
4 3 5 ; 5 5 6
UNIT INCH
MEMB PROP
1 TO 5 PRIS AX 10. IZ 300. IY 300. IX 10.
DEFINE MATERIAL START
ISOTROPIC STEEL
E 29000.
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 4 6 FIXED
LOADING 1 SINKING SUPPORT
SUPPORT DISPLACEMENT LOAD
4 FY -0.50
PERFORM ANALYSIS
PRINT ANALYSIS RESULTS
FINISH
STAAD Output File
PAGE NO. 1 **************************************************** * * * STAAD.Pro CONNECT Edition * * Version 22.07.00.** * * Proprietary Program of * * Bentley Systems, Inc. * * Date= APR 19, 2021 * * Time= 17:28:42 * * * * Licensed to: Bentley Systems Inc * **************************************************** 1. STAAD SPACE TEST FOR SUPPORT DISPLACEMENT INPUT FILE: US-5 Support Settlement on a Portal Frame.STD 2. UNITS KIP FEET 3. JOINT COORDINATES 4. 1 0.0 0.0 0.0 ; 2 0.0 10.0 0.0 5. 3 20.0 10.0 0.0 ; 4 20.0 0.0 0.0 6. 5 20. 10. 20. ; 6 20. 0. 20. 7. MEMBER INCIDENCE 8. 1 1 2 3 9. 4 3 5 ; 5 5 6 10. UNIT INCH 11. MEMB PROP 12. 1 TO 5 PRIS AX 10. IZ 300. IY 300. IX 10. 13. DEFINE MATERIAL START 14. ISOTROPIC STEEL 15. E 29000. 16. POISSON 0.3 17. DENSITY 283E-006 18. ALPHA 6E-006 19. DAMP 0.03 20. TYPE STEEL 21. STRENGTH FY 36 FU 58 RY 1.5 RT 1.2 22. END DEFINE MATERIAL 23. CONSTANT 24. MATERIAL STEEL ALL 25. SUPPORT 26. 1 4 6 FIXED 27. LOADING 1 SINKING SUPPORT 28. SUPPORT DISPLACEMENT LOAD 29. 4 FY -0.50 30. PERFORM ANALYSIS TEST FOR SUPPORT DISPLACEMENT -- PAGE NO. 2 P R O B L E M S T A T I S T I C S ----------------------------------- NUMBER OF JOINTS 6 NUMBER OF MEMBERS 5 NUMBER OF PLATES 0 NUMBER OF SOLIDS 0 NUMBER OF SURFACES 0 NUMBER OF SUPPORTS 3 Using 64-bit analysis engine. SOLVER USED IS THE IN-CORE ADVANCED MATH SOLVER TOTAL PRIMARY LOAD CASES = 1, TOTAL DEGREES OF FREEDOM = 18 TOTAL LOAD COMBINATION CASES = 0 SO FAR. 31. PRINT ANALYSIS RESULTS ANALYSIS RESULTS TEST FOR SUPPORT DISPLACEMENT -- PAGE NO. 3 JOINT DISPLACEMENT (INCH RADIANS) STRUCTURE TYPE = SPACE ------------------ 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 0.09125 -0.00040 -0.01078 -0.00014 0.00050 -0.00154 3 1 0.09118 -0.49919 -0.09118 -0.00154 0.00000 -0.00154 4 1 0.00000 -0.50000 0.00000 0.00000 0.00000 0.00000 5 1 0.01078 -0.00040 -0.09125 -0.00154 -0.00050 -0.00014 6 1 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 TEST FOR SUPPORT DISPLACEMENT -- PAGE NO. 4 SUPPORT REACTIONS -UNIT KIP INCH STRUCTURE TYPE = SPACE ----------------- JOINT LOAD FORCE-X FORCE-Y FORCE-Z MOM-X MOM-Y MOM Z 1 1 0.08 0.97 0.15 19.22 -0.46 107.07 4 1 0.07 -1.95 -0.07 107.18 0.00 107.18 6 1 -0.15 0.97 -0.08 107.07 0.46 19.22 TEST FOR SUPPORT DISPLACEMENT -- PAGE NO. 5 MEMBER END FORCES STRUCTURE TYPE = SPACE ----------------- ALL UNITS ARE -- KIP INCH (LOCAL ) MEMBER LOAD JT AXIAL SHEAR-Y SHEAR-Z TORSION MOM-Y MOM-Z 1 1 1 0.97 -0.08 0.15 -0.46 -19.22 107.07 2 -0.97 0.08 -0.15 0.46 0.65 -116.64 2 1 2 0.08 0.97 0.15 0.65 -0.46 116.64 3 -0.08 -0.97 -0.15 -0.65 -36.66 116.82 3 1 3 -1.95 -0.07 0.07 -0.00 -116.17 -116.17 4 1.95 0.07 -0.07 0.00 107.18 107.18 4 1 3 0.08 -0.97 -0.15 -0.65 36.66 -116.82 5 -0.08 0.97 0.15 0.65 0.46 -116.64 5 1 5 0.97 0.15 0.08 0.46 -116.64 -0.65 6 -0.97 -0.15 -0.08 -0.46 107.07 19.22 ************** END OF LATEST ANALYSIS RESULT ************** 32. FINISH *********** END OF THE STAAD.Pro RUN *********** **** DATE= APR 19,2021 TIME= 17:28:42 **** TEST FOR SUPPORT DISPLACEMENT -- PAGE NO. 6 ************************************************************ * For technical assistance on STAAD.Pro, please visit * * http://www.bentley.com/en/support/ * * * * Details about additional assistance from * * Bentley and Partners can be found at program menu * * Help->Technical Support * * * * Copyright (c) Bentley Systems, Inc. * * http://www.bentley.com * ************************************************************