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.

Example Problem No. 5

Where:

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.

Note: Semicolons (;) are used as line separators to allow for input of multiple sets of data on one line.

    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  22.12.00.***                  *        
             *           Proprietary Program of                 *        
             *           Bentley Systems, Inc.                  *        
             *           Date=    OCT 27, 2022                  *        
             *           Time=    15:10:17                      *        
             *                                                  *        
             *  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= OCT 27,2022   TIME= 15:10:17 ****
      TEST FOR SUPPORT DISPLACEMENT                            -- PAGE NO.    6
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