8/2/2019 Steps for Seismic Analysis-rc Frames

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EUGEN LOZINCUniversitatea Tehnic de Construcii Bucureti

CCBA

UNIVE

RSITATEA

TEHNICA

31/41 stepsfor CONVENTIONAL

SEISMIC ANALYSIS

for RC WALL structures

8/2/2019 Steps for Seismic Analysis-rc Frames

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EUGEN LOZINCUniversitatea Tehnic de Construcii Bucureti

CCBA

UNIVE

RSITATEA

TEHNICA

STEPS FOR CONVENTIONAL SEISMIC ANALYSIS

1. Select SI units [kN-m]

2. Define the grid and story data

3. Define the RC material (with Ecdcracked=0.5Ecd)

4. Define the cross-section for columns and beams5. Define (Draw) the columns (section and location)

6. Define (Draw) the beams (section and location)

7. Define the sections for slabs (membrane)8. Define (Draw) the slabs (section and location)9. Define the sections for walls (shell)

10. Define (Draw) the walls (section & location)

11. Define the sections coupling beams

12. Define (Draw) the coupling beams (section & location)

13.Assign the End (Length) Offsets for columns & beams

14.Assign Joint/Point Rigid Diaphragm (for slabs joints)

8/2/2019 Steps for Seismic Analysis-rc Frames

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EUGEN LOZINCUniversitatea Tehnic de Construcii Bucureti

CCBA

UNIVE

RSITATEA

TEHNICA

STEPS FOR CONVENTIONAL SEISMIC ANALYSIS

15. Assign reduced stiffness for coupled beams

16. Mesh the walls

17. Assign PIER LABELS for walls

18. Define static load cases gravity loads

19. Assign gravity uniform loads to slabs (current floor)20. Assign uniform loads to perimetrical beams (from

exterior curtain walls)

21. Replicate the defined story

22. Assign gravity uniform loads to terrace slabs

23. Assign uniform loads to terrace perimetrical beams(from attic)

24. Define Mass Source25. Check model & Set Analysis Options

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EUGEN LOZINCUniversitatea Tehnic de Construcii Bucureti

CCBA

UNIVE

RSITATEA

TEHNICA

STEPS FOR CONVENTIONAL SEISMIC ANALYSIS

26. Run Analysis

27. Show Mode Shapes & Display Modal ParticipatingMass Ratio

---28. Define static load cases earthquake loads

29. Re-run Analysis

30. Verify the GF story shear (by comparing it with thehand-calculated conventional seismic force Fb=cWT)

31. Check the shear force in the coupling beams & the axial force in the RC coupledwalls

* If the shear force is too large or if one of the RC walls is tensioned (positive axialforce), unlock the model, reduce the height of the coupling beams, re-analyze andre-check

32. Check the shear force in the RC walls

* If the shear force is too large, unlock the model, increase the width of therespective RC walls, re-analyze and re-check

8/2/2019 Steps for Seismic Analysis-rc Frames

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EUGEN LOZINCUniversitatea Tehnic de Construcii Bucureti

CCBA

UNIVE

RSITATEA

TEHNICA

STEPS FOR CONVENTIONAL SEISMIC ANALYSIS

33.Show Deformed Shape for EQ load cases

34.Visualize the joint displacement and Lateral Drifts

35.Check the amplified drifts for SLS and ULS ***

*** If the drifts are larger than the admissible ones, unlock themodel, increase the width of the RC walls, re-analyze and re-check again the drifts.

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36.Define LOAD COMBINATIONS37. Show wall (PIER) & C.B. forces (N, M3-3, V2-2)

38.Show beam forces (M3-3, V2-2)

39.Show column forces for EQ on OX dir. (N, M3-3, V2-2)*** PAY ATTENTION if you rotated the local axes for some members

Show column forces for EQ on OY dir. (N, M2-3, V3-3)*** PAY ATTENTION if you rotated the local axes for some members

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EUGEN LOZINCUniversitatea Tehnic de Construcii Bucureti

CCBA

UNIVE

RSITATEA

TEHNICA

STEPS FOR CONVENTIONAL SEISMIC ANALYSIS

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40.Print the necessary diagram forces or

41.Modify the colors for display windows and CAPTURE

the screen by Print Screen button (of the keyboard)or by appropriate software (as for example: SNAGIT)