ETABS sreps

7/27/2019 ETABS sreps

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This building has 4-storeys. Other specifications will be described during modeling.

1. Double click the Etabs icon on your desktop or from the Start Menu.2.Click on New Model.

3. The following window appears, click No.

4.Now you have to enter the data for your model. I

n my case, X and Y grid spacing is same i.e 24 and bottom storey height is 15, also the typical

storey height is 15. Number of X and Y lines are 4 and number of storeys are 3.

5. Click Grid Only and then click Ok.

6. Now your grid model will be displayed like below:

7. Now you have to define the properties of your model. First of all we would define Material

Properties. Go to DefineMaterial Properties.

8. The following window will be displayed. Concrete and Steel are already defined in Etabs, soyou can modify their properties or define any other material as well. My structure is concrete

structure so I am going to modify the properties of concrete here.

9. When you click on modify, the following window appears. Change the properties according to

your requirements. Click ok to close the dialog boxes.

10. Now you have to define the Frame sections (beams and columns). Go to DefineFrameSections

11. The following box appears. Click to add a rectangular section.

12. The following box appears. This will be your Beam 1. Name the section and choose concretein the material list. Write down the size of your beam, here I have taken 12*24. And click on the

reinforcement.

13. The following dialog box will open. Click on beam and specify the top and bottom cover forrebars according to the requirement.

14. In the same way define Beam 2. Size of Beam 2 is 16*28.

Now again click on Add Rectangular to define the columns.


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15. Name it Col1, choose material concrete. Write the dimensions of column. Here I have taken

12*12. Then click on reinforcement.

16.Specify the cover and then click ok. In the same way define Col 2. Its size is 14*14. Click ok

to close the dialog boxes.

17. As my model is having same arrangement of beams and columns in all the three stories, so I

want to place the beams and columns once in the 3 stories. So at the bottom of this window, I

have chosen similar stories option.

18. Now define the area section that is the slab. Go to DefineWall/Slab/Deck Sections.

19. Slab1 is already defined. Click on modify/show section.

20. The following dialog box appears. Write down the thickness of your slab and bending (a

usual practice is to use the value of one unit less than the thickness for bending). Choose your

slab type. Click ok.

21. Now we will place the beams, columns and slab one by one. For this go to Create Lines in

Region as shown in the figure.

22. A small window appears. Here you will choose which beam you want to place first. Choose

beam1.

23. Click on the lines where you have to place Beam1. Beams will be shown by yellow color.

24.In the same way select beam 2.

25. And place it on the required lines in the plan.

26. Now click on Create Columns in Region.

27. A small window appears. Choose Col1.

28. Click on the points where you have to place Col1. Columns will be shown by green colors.

29. Your model will look like this.

30. Now we have to place the slab. Click at Create Areas.

31. Choose Slab1.

32. Now one by one click on each panel. The boundary color will change indicating slab.

33. This is how your model looks after placing slab on all the panels.


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33. Click on the small tick symbol indicating Set Building View Options.

34. Click on Object Fill on the first column and then check the box at the bottom Apply to All

Windows. Click Ok.

35. Now you can see the extruded view as shown below:

Thats all for now. I will soon upload the further procedure on how to assign the loads. Keep

visiting Knowledgeoverflow.


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Design of Water Tank using SAP2000 Unit = lb-ft.

New Model Grid. Cylinder R= 5, = 9, z = 5. Along, r = 5.93, = 4.5, z = 13. Edit Z last value =

49.

Draw beams in 2nd storey. Edit > Replicate parallel to Z-axis. Z = 13, number = 2. Draw edge beam in 1st storey. Select beams. Edit > replicate parallel to z-axis. Z = 13, No.= 1 For ring beam.

Define > co-ordinate. t = 0, 11.25, 22.5 ............. 360

Draw one element on one grid line. Select it and replicate. Radial along Z-axis. =11.25, No. 31.

Select all beams in this storey. Select insertion point to center. Draw single element of area. Select area.

Assign > Area > Local axis, 5.625,

Select area and replicate 31 No & = 11.25 Tz plane select. Draw walls. Select walls. Edit > auto mesh 1-2 = 2, 1-3 = 10


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Define

Define > joint pattern, hydropath Define > load cases. Name = hydro water pressure = type Define frame section. Define B15 x 12, C12 x12 Define > area section. Slab, top slab, wall Select beams, assign B 15 x 12 Select column assign C12 x 12 Select tank base, assign slab Select wall

Assign

Assign > joint pattern hydropath, C = 1, D = -49 Select > get previous selection Assign > area load > surface pressure, Load = hydro, face = 5. By joint pattern. Name =

hydropath. Multipliers = 62.4

Add to existing load Select slab. Assign load= 62.4 lb/ft2

Analyze

Analyze > run analysis, model DO NOT RUN Display > show forces/stresses > hydro. Check it for hoop stress

Design (Design Check & Area of Steel) Design > concrete frame design > display design combo. UDCON1, UDCON2 Design > concrete frame design > start design/check Design > concrete frame design > verify all memberance passed


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Design > concrete frame design > display design info Select longitudinal reinforcement. Design slab, top slab, wall by getting AST1, AST2, beams and columns.


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Design of Transmission Tower in SAP2000

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D.L = 30K, L.L= 35k, on top most joint in gravity direction Unit = k-ft New model = 3D truss.

Transmission Tower

S. No Elevation Wud in a (H) b (W)

1 0 40 0 0

2 16 32 0.3 0.3

3 32 24 0.3 0.3

4 48 16 0.3 0.35 64 8 1 1

6 72 8 0 0

7 80 8 0 0

8 88 8 0 0

Chord = W18 x 35 Braces = W 18 x 35

Define:

Define > material, steel, modifying fy = 36 ksi. Fx = 58ksi. Define > load cases add D.L & in L.L Self wt =0 Define > add default combo select steel & convert to user check boxes. Select top most joints.

Assign

Assign > Joint loads> forces apply loads. Select all. Assign > frame> release/Partial fixity, check M33 both check boxes.


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Analyze

Analyze >select analysis option. Select 3D trauss. Display > show forces> frames. Select UDSTL2 & axial force. Uncheck fill , check

show values, check boxes and view the values on top most and bottom most members

EARTH QUAKE STATIC (UBC 97) Define> load. All EQS , EQY

Quake (UBC 97).

Select EQS, modify select,

Global X, soil profile =SD.

Seismic zone = 0.2, Ct=0.03, R=5.5.

Select EQY , modify select. Global Y, soil profile =SD.

Seismic Zone = 0.2, Ct=0.03, R=5.5.

Define > add default combo. Select concrete, convert. Do UST of process for structure analysis.

After analysis:

Display>deformed shape, select model, run animation and change the model.

Reponse Spectrum in Seismic Analysis Define > function > response spectrum. Add new function, name = Rs. Define > analysis cases. Add new function, new = Rsx Analysis case = Response

spectrum. Acceleration U1 Rs 32.2

Select Rsx Add copy Name Rsy Acceleration U2 Rs 32.2 Do rest of the work for structure analysis


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After Analysis:

Display > show deformed shape. Select model and run animation and change themodel.

Design & Beam Analysis using SAP2000

WD = 20 K/ft, WL = 60 k/ft, Fy = 60 Ksi, fi = 4 ksi.

Steps:

Unit = Kft-f New model = Beam,

o span = 2.o Modify x1 =0,o x2=20,o x3 = 45.

Option > Preferenceo concrete code = ACI 2003.

Define:

Define > Material Create, Modify fy = fys = 60 Ksi,fi = 4 ks

Define > Frame sections.o Add rectangular section.o Name = B 15 * 12,o Depth = 15m,o width = 12 Reinforcement, click

Beam bottom.

o Clear cover top = Bottom = 2.5 Define> load cases, add live load. Define > add default combo. Check concrete & convert to user editable boxes. Select beams
http://www.aboutcivil.org/Downloads/2dbeam3span.wmv


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Assign:

Assign > frame

Frame section, select B15* 12. Select> get previous select. Assign > frame load

o Distributed.o Load cases = dead,o Load = 0.02.

Select > get previous select Assign > frame load

o Distributed.o Load case = live,o Load= 0.0 6

Analyze > analysis case. x-z plane Save model.

Analysis:

Analyze > Run analysis.

o Select model,o Click do not run,o Click Run.

Design > deformed shape, select DCON2. Display > show forces/stress.

o Select UDCON2,o select F22, it gives such values.o Uncheck fill,o check show values.

Display > show forces/stresses,o select M33. It gives banding moment values.

By clicking right button of mouse on any member, a window opens showing fulldetails of shear, moment & deflation of that member.

Display >show forces/stress
http://www.aboutcivil.org/Downloads/Beam.wmvhttp://www.aboutcivil.org/Downloads/2Span-Beam-WEB.wmvhttp://www.aboutcivil.org/Downloads/Beam.wmvhttp://www.aboutcivil.org/Downloads/2Span-Beam-WEB.wmv


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o Joints.o Select UDCON2, this gives Joint reaction.

Design & Analysis of Stairs Using

SAP2000 WD =50 lb/ft2 , WL= 75 lb/ft2 Slab waist = 6, fc= 4ksi; fy = 60 ksi

Steps:

Unit = lb-ft Model= stair cases

o Stair type = type2,o Right level width= 6,o Storey height = 13,o Stair projected length = 11.25o Opening b/w stairs = 1,o width1=5,o width2 =6o Max mash spacing = 1

Option>preference> concrete frame design ACI-2003 Define> material concrete, modify, fc =4 ksi, fy=60ksi Define > area section, modify, name= slab6. Thickness= 6 Define > load cases, line load

Define > add default combo Select waist slab Select > invert selection Assign > area > local axis, -90 Select All


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repair cosDesign Of

Time History Analysis SAP2000 Define >

o function > time historyo Function type = function from fileo Name = THo

Browse & select elcentro.o Values = time and function value, display

Define > Analysis Caseo New case name = THxo Analysis case = time historyo Load type = Accel, load name = Uo Function = TH, scale = 32.2o Select lines, model, transient.

Select THx Add copy name Thy

o Load name = U2o Do rest of the work for structure analysis

After Analysis:

Display > show deformed shape,o Select model,o Start animation ando Change model

Assign > Area load > uniform assign loads Analysis > analysis option, 3D Analysis > run analysis; model Do NOT RUN Run Now Display > show forces > area M11, M22 Display > show forces > area AST1, AST2


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ETABS sreps