column example.pdf

7/28/2019 Column Example.pdf

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6-10 spSection Module

Example 5 Capacity of an Irregular Section

Compute horizontal moment capacity Mx of theunsymmetrical beam cross section69 shown below.Use 3-ksi concrete and 60-ksi reinforcing steel.

Note: when instructed to move to a location (15, 25), move the cursor until thecells in the Status bar show x=15 and y=25.

From the File menu, choose New.Any input data is cleared and the

default values are restored.22. From the Input menu, choose

General Information.

x Select English units and ACI318-08 code.

x Select BIAXIAL for RUN AXIS,Investigation for run optionand NO for CONSIDERSLENDERNESS?

x Choose OK.

69Based on Example 4.7, pp 161 from Reinforced Concrete: Mechanics and Design by James G. Wightand James K. MacGregor, Fifth Edition, 2009, Pearson Prentice Hall, Pearson Education Inc.


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spSection Module 6-11

23. From theInputmenu, chooseMaterial Properties.

x Under CONCRETE, input 3 for the STRENGTH. Other properties arecomputed and will be accepted.

x Choose OK.

24. From theInputmenu, chooseSection | Irregular.The spSection module is loaded, its windowoccupies the desktop, and the DRAWINGAREA boxappears.

x Under Limits, input 0 and 20 for theMINIMUMX andMINIMUM Y, respectively.

x Under limits, input 24 and 4 for theMAXIMUMX andMAXIMUM Y, respectively.

x Under GRID, input 4 and 4 for X and Y gridSTEP, respectively and check the SHOW GRIDoption.

x Under SNAP, input 4 and 4 for X and Y STEP,respectively and check the SNAP ON option.

x Choose OK.

25. The default input session is Section and the default input mode is Add (theEdit | Section andEdit | Add options are checked).

x

In the Graphics area, move the cursor to the location (0, 0) and click theleft mouse button. A node is inserted.

x Move to (12, 0) and click the left mouse button.

x Move to (12, -20) and click the left mouse button.

x Move to (24, -20) and click the left mouse button.




x Click the right-mouse button to end drawing the section.

26. From theMain menu, choose Save and Exit. Y ou are returned to spColumnand the section is shown in the Information bar.


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27. From the Input menu, choose Reinforcement | Irregular. The spSectionmodule is loaded, its window occupies the desktop.

28. The default input session is Reinforcement and the default input mode is Add(theEdit | Reinforcement andEdit | Add options are checked).

29. Define some bars using multiple bar generation:

x From the Edit menu, choose Reinforcement.Input 1 for the NUMBER OF BARS and select #9for the BAR SIZE. Choose OK.

x Move the cursor to any location and click theleft mouse button.

x From the Edit menu, choose Modify. Input14.142 for X-COORD and -17.5 for Y -COORD. Click MODIFY and then OK.

x From theEdit menu, chooseReinforcement. Input 1 for the NUMBER OFBARS and select #8 from BAR SIZE. Choose OK.

x Move the cursor to any location and click the left mouse button. A #8 baris generated at that location.

x From theEdit menu chooseModify. Input18 for X-COORD and -17.5 for Y -COORD.Click MODIFY and then OK.

x From the Edit menu, chooseReinforcement. Input 1 for the NUMBER OF

BARS and select #8 from BAR SIZE. ChooseOK.

x Move the cursor to any location and clickthe left mouse button. A #8 bar is generatedat that location.

x From theEdit menu chooseModify. Input22 for X-COORD and -17.5 for Y -COORD.Click Modify and then Ok


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spSection Module 6-13

30. From theMain menu, chooseSave and Exit. Y ou are returned to spColumnand the section is shown in the Information bar.

31. From the Input menu, choose Input |Loads | .Factored

32. Enter LOAD as 0 (zero), X-MOMENT as -225 ft-kips and Y-MOMENT as 0.

33. From theSolvemenu, chooseExecute.

x A message is displayed sayingReinforcement ratio is less than 1%Consider column as architectural (i.e. fc isreduced by reinforcement ratio?). ClickNO for this option.

x The solver of the program is started and,upon completion, displays the interactiondiagram of the section.

34. From theViewmenu, chooseResults.

x Page through the results file.


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x ChooseExit to quit the spView program and get back to spColumn.

35. From theFilemenu, choosePrint Results.

x Select the printer to send the text results to.

x Choose PRINT.

36. From theFilemenu, choosePrint Screen.

x Select the printer to send the graphical results to.

x Choose PRINT

x Change the interaction diagram to show the P-M diagram at 180o using

the icon.

column example.pdf

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