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Small-Amplitude Vibration Tests of a Full-Scale RC Flat-Plate Structure

Small-Amplitude Vibration Tests of a Full-Scale RC Flat-Plate Structure. By: Luis Arboleda. MSCE Thesis. Problem Definition. Hypothesis. “The natural frequencies and lateral stiffness of a 3D RC flat-plate structure can be estimated using a conventional 2D frame analysis”. Specimen. α.

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Small-Amplitude Vibration Tests of a Full-Scale RC Flat-Plate Structure

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  1. Small-Amplitude Vibration Tests of a Full-Scale RC Flat-Plate Structure By: Luis Arboleda MSCE Thesis

  2. Problem Definition

  3. Hypothesis “The natural frequencies and lateral stiffness of a 3D RC flat-plate structure can be estimated using a conventional 2D frame analysis”

  4. Specimen

  5. α Exterior Interior 0.35-0.60 0.55-0.85 Pecknold (1975) Allen and Darvall (1977) 0.65 0.45 0.50 0.65 Banchik (1987) Hwang and Moehle (1993) 0.15-0.40 0.20-0.65 Literature Review

  6. Elevation View Plan View Test Setup 15

  7. Typical Result

  8. Test Results

  9. 1.32 1.27 2.09 1.98 1.69 1.58 86 79 1.20 1.16 2.09 1.98 1.34 1.30 86 79 f and k for Ec= 3800 ksi

  10. Length 0.5% Check as-built dimensions Width 0.5% Depth 0.9% ? Ec Variables to Calculate k 7

  11. 1.19 1.14 2.09 1.98 1.36 1.27 86 79 1.08 1.05 2.09 1.98 1.09 1.05 86 79 f and k for Ec= 4700 ksi 1.32 1.20

  12. 1.08 1.04 2.09 1.98 1.12 1.05 86 79 0.98 0.95 2.09 1.98 0.90 0.87 86 79 f and k for Ec= 5700 ksi 1.19 1.08

  13. α 2D Frame Analysis Exterior Frames Interior Frames 2.09 1.98 86 79 α for Ec= 4700 ksi 0.5

  14. α 2D Frame Analysis Exterior Frames Interior Frames 2.09 1.98 86 79 α for Ec= 5700 ksi 0.3

  15. Is it plausible that Ec is larger than 3800 ksi?

  16. Pauw (1960)

  17. CYLINDER C-3 EC,ASTM= 3950 ksi Ec of the Flat-Plate Structure Ecmean= 4000 ksi 6

  18. Could Ec be Larger than EC,ASTM?

  19. More Cylinders 32

  20. Small Stresses

  21. Free-Vibration Tests 15 Tests, 6L, 9M

  22. Free-Vibration Test Results

  23. Stresses in the Pull-Release Test

  24. Conclusions • The secant modulus of concrete can be larger than 1.25× EC,ACI (or 1.2 × EC,ASTM) for σ< fC’/15. • α= 1/2 can be used to model a 3D flat-plate structure using 2D frame analyses. • (It was obtained assuming EC= 1.25 × EC,ACI).

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