sacs软件

1. Model description:

The frame is 10’ x 20’, the upright columns are 10” x 10” x ¼” box sections and the horizontal beam is an AISC W18x40 wide flange. Three load cases will be considered, Load case 1 is a uniform dead load of -1.0 kips/ft along the horizontal beam; Load case 2 is a 16 kips concentrated wind load; Load case 3 is a load combination of load case 1 and 2, each at 100% and factored at 133%.

2. Create Project and major task “Structural Modeling”:

Launch SACS Executive;

Under Project/Task menu select Add project Type in Name “Tutorial”

Type in Location “C:\\...\\Tutorial”

Type in Description “Demonstration Problem” Type in Worksheet file “Tutorial” then click OK

Accept and create the new directory (Refer to following “Add New Project” figure)

Under Project/Task menu select Add major task Type in Name Structural Modeling Type in description Create Model File Type in File Identifier dat

Then click OK (Refer to following “Add New Task” figure)

1

3. Model generation using PRECEDE:

Make sure the unit is correctly set to English. Under Settings > SACS System Configuration > Units, select English unit if necessary. (Refer to “SACS System Configuration” figure)

2

a) Launch PRECEDE

Click Modeling > Precede

Select “Created new model” then OK (Refer to “PRECEDE” Figure)

For new structure select “None”; Type in Title “Tutorial Frame”

Deselect “Use alphanumeric jacket joint names with tags” Then click OK (Refer to “New Structure” Figure)

PRECEDE program will be launched (Refer to “PrecedePro” figure)

3

b) Create joints

Add joint #1 with absolute coordinates of 0, 0, 0

Add joint #2 with absolute coordinates of 0, 0, 10.0

Use menu command Display > Plane > YZ Plane Change current 3d view to YZ plane, click any one of the two joints for X value coordinates. (Refer to “Define YZ Plane” Figure)

Use Display > Zoom Box > Translate/Rotate > General command Select by drawing a window includes joint #1 and #2,

Type in Translation Y “20.0” (Refer to “Translate and Rotate – General” Figure)

Select “Duplicate” then “Duplicate existing joints”

4

Type in Number of duplications “1” (Refer to “Translate and Rotate – Duplicate” Figure)

Click OK and created joints #3 and #4

Use Display > Labeling > Joint to display joint names. We have created four corner joints of the frame. (Refer to “PrecedePro [untitled]” Figure)

5

c) d)

Save and register the file in the project by accepting all the default names and settings, the saved file name shall be SACINP.DAT Add frame members

Add member 1 to 2 and 3 to 4 as group “COL”; Add member 2 to 4 as group “GRD”

Use Display > Labeling > Members to display members groups. (Refer to “Precedepro [C:\\...\\Tutorial\\Structural Modeling\\SACINP.DAT” figure)

6

e)

Define member properties

Select Property > Member Group and Choose “COL” then “Define” Select Group type as “General”

Type in Section label “Box10” (Refer to “Define Member Group COL” Figure)

Choose “GRD” then “Define” Select Group type as “General”

Browse in section label to find “W18X40” (Refer to “Define Member Group GRD” Figure)

7

Select “Close” to quit member group definition window

f)

Select Property > Member Section Choose “Box10”

Select Section Type as “Box”

Then “Define” (Refer to “Member Section” Figure)

Define member sections

Type in Side depth “10.0”

Type in Side wall thickness “0.25” Type in Width “10.0”

Type in Top wall Thickness “0.25” (Refer to “Define Section BOX10” Figure)

8

Then OK and “Close” to quit

g)

Select “Joint” > “Fixities” and Choose Joint #1 and #3 (Hold Ctrl key to perform multiple joint selection),

Type in New Fixity “111111” then “Close” to quit. (Refer to “Joint Fixities” Figure)

Define joint fixities

h)

Save and view 3D in Model viewer

Use Display > Model Viewer to display 3d model.

9

i)

Add load case #1

Select Load > Members then Choose member 2-4 and click “Apply” Type in Load Condition “1” Type in Load ID “Dead”

Select Load type as “Distributed” then Click “Add” (Refer to “Member Loads” Figure)

Type in Initial load value “-1.0”

Type in final load value “-1.0” then click OK (Refer to “Member Distributed” Figure)

Review the force summary report and Click “Save”, the load will display in the graphics window also. (Refer to “Sum of Forces Report” Figure)

10

j)

Add load case #2

Select Load > Joints then Choose joint #2 and click “Apply” Type in Load Condition “2”

Type in Load ID “WIND” then “Add” (Refer to “Joint Loads” Figure)

Type in Fy “16.0” then OK (Refer to “Joint Loads LC2” Figure)

Review force summary report and “Save”, note the force also shown in the graphics window. (Refer to “Sum of Forces Report” Figure)

k)

Add load case #3

11

Select Load > Combine Load Conditions Type in LC combination label “3” then “Define”

Choose Load case 1 and 2 then “OK” and “Close” to quit (Refer to “LC Combination Data for LC 3” Figure)

l) Save

m) Define allowable stress modifier

Select Options > Allowable Stress/Mat Factor

Choose load case 3 and type in factor as “1.333” then “Update” to quit (Refer to “Allowable Stress/Material Factor” Figure)

Save, Exit PRECEDE program.

4. Use Datagen to make modifications to model file SACINP.DAT:

Choose Modeling > DataGen, select Edit existing data file and select SACINP.DAT.

Change options line: Double click the OPTIONS line, make necessary changes as

12

- General Window: select APUC for code check option – Tubular API 21st edition and others AISC 9th edition; (Refer to “SACS Options – General” Figure)

- Report Window: Choose appropriate print options as desired (Refer to “SACS

Options – Report” Figure)

13

Double Click AMOD line and Change allowable stress modifier from 1.333 to 1.33 (Refer to “Allowable Stress Modifier” Figure)

Save file and exit from DataGen program, the model file now is ready to run.

5. Create Major Task “Static Analysis”:

Use Project/Task > Add major task again Type in Name “Static Analysis”

Type in description “Run Static Analysis” Type in File Identifier “sta”

Then click OK (Refer to “Add New Task” Figure)

14

Choose Structural Modeling task from Tasks for Project ‘Tutorial’ in lower left part of the Executive window, make sure “All files in current directory” be selected under “File View” in the middle part of the Executive window. (Refer to “SACS Executive” Figure)

Register model file SACINP.DAT to major task Static Analysis by right click the file and choose popup command “Add to Project”, choose “Static Analysis” under Major Task pull down window. Click OK to register. (Refer to “Add File to Project Registry” Figure)

15

6. Create run file and perform analysis

Back to Major Task “Static Analysis” and make sure “Files available to task

‘Static Analysis’” be selected under “File View” in the middle part of the Executive window

Select “Runfile Wizard” and “Linear Static Analysis”

Click “Start Wizard” and choose “Perform Element check” and “Postvue Database options” then ok to complete.

Review each item and Click “Run” to execute the run. (Refer to “SACS Executive” Figure)

Please refer to the “Run file Creating – Tutorial Problem.pdf” file for more detail about this section.

7. Review results in both listing file and Postvue program.

This is the End of Tutorial Problem Part.

16

Appendix – SACS input file data deck for SACINP.DAT

123456701234567012345670123456701234567012345670123456701245678 Tutorial Frame

OPTIONS EN SDUC 2 1 C PTPT PTPT AMOD

AMOD 3 1.33 SECT

SECT BOX10 BOX 10.000.250 10.000.250 GRUP

GRUP COL BOX10 29.0011.6036.00 1 1.001.00 N490.00 GRUP GRD W18X40 29.0011.6036.00 1 1.001.00 N490.00 MEMBER

MEMBER 1 2 COL MEMBER 3 4 COL MEMBER 2 4 GRD JOINT

JOINT 1 0. 0. 0. 111111 JOINT 2 0. 0. 10.

JOINT 3 0. 20. 0. 111111 JOINT 4 0. 20. 10. LOAD

LOADCN 1

LOAD Z 2 4 -1.0000 -1.0000 GLOB UNIF DEAD LOADCN 2

LOAD 2 16.0000 GLOB JOIN WIND LCOMB

LCOMB 3 1 1.000 2 1.000 END

***SPMB** 1 2 1 2 3 4 3 4 2 4 2 4 END

123456701234567012345670123456701234567012345670123456701245678

17