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Bidirectional Mass Platform (Single Curvature)

Seismic Simulation and Design of Bridge Columns Under Combined Actions and Implication on System Response University of Nevada, Reno Dr. David H. Sanders Juan Arias-Acosta Feb. 22 - 2008. Bidirectional Mass Platform (Single Curvature). Bidirectional Mass Platform (Single Curvature).

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Bidirectional Mass Platform (Single Curvature)

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  1. Seismic Simulation and Design of Bridge Columns Under Combined Actions and Implication on System ResponseUniversity of Nevada, RenoDr. David H. Sanders Juan Arias-AcostaFeb. 22 - 2008

  2. Bidirectional Mass Platform (Single Curvature)

  3. Bidirectional Mass Platform (Single Curvature) Universal joints

  4. Bidirectional Mass Platform (Safety system)

  5. Bidirectional Mass Platform (Double Curvature) Double Link

  6. Bidirectional Mass Platform (Double Curvature)

  7. Circular Columns (Specimens Selection)

  8. Circular Columns Details (Single Curvature)

  9. Circular Columns Details (Double Curvature)

  10. Interlocking Spiral Columns (Specimen Selection)

  11. Analytic models (OpenSees) • Uniaxial concrete material Concrete04 Mander’s model – Degradation according to Karsan-Jirsa • 3D model, cantilever beam inelastic fiber elements P Inelastic fiber element M Elastic element Zero length element Beam with hinges

  12. Analytic models (OpenSees) • Uniaxial material ReinforcingSteel • Strain rate effect according Zadeh - Saiidi

  13. Analytic models (OpenSees) • Bond Slip according to Wehbe – Saiidi • As Moment – rotation hysteresis

  14. Analytic models (OpenSees) C + AL + PD : As single Column, constant axial load and Pdelta effect. C + UT + PD : As single Column, Unbonded tendon and Pdelta effect. P=80 K Rigid link Rigid link Point Mass Point Mass Fiber section Fiber section Beam with Hinges Truss Element Beam with Hinges Elastic Element Fiber section Fiber section Zero length Element Zero length Element C+UT+PD C+AL+PD Rigid link Rigid link

  15. Analytic models (OpenSees) MR + C+PD+ UT : Mass frame, column including unbonded tendon & PD. Additional mass Rigid links Corotational Truss Ele. Rigid links Point Mass Elastic Beams Beam with Hinges Truss Element Corotational Truss Ele. Corotational Truss Ele. Rigid link MR+C+PD+UT

  16. Analytic models (OpenSees) MR+C+PD+UT

  17. Earthquakes El Centro: 0.33, 0.66, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0 Sylmar: 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6 Mendocino- Petrolia: 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4 Northridge-Sepulveda: 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4 Kobe: 0.3, 0.6, 0.9, 1.2, 1.4, 1.5, 1.8, 2.1, 2.4 Northridge- Arleta: 0.3, 0.6, 0.9, 1.2, 1.4, 1.5, 1.8, 2.1, 2.4, 2.7, 3.0 Northridge- Newhall: 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8 LomaPrieta- Corralitos: 0.3, 0.6, 0.9, 1.2, 1.4, 1.5, 1.8, 2.1, 2.4, 2.7, 3.0 LomaPrieta- Capitola: 0.3, 0.6, 0.9, 1.2, 1.4, 1.5, 1.8, 2.1, 2.4, 2.7, 3.0 UCLA UNR UIUC

  18. Elastic Spectrum

  19. Analysis (El Centrox4 - XDisplacement) C+AL+PD

  20. Analysis (El Centrox4 - XDisplacement) C+AL+PD MR+AL+PD

  21. Analysis (El Centrox4 - XDisplacement) C+AL+PD MR+AL+PD C+UT+PD

  22. Analysis (El Centrox4 - XDisplacement) C+AL+PD MR+AL+PD C+UT+PD MR+AL+PD

  23. Analysis (Kobex2.4 - X Displacement)

  24. Analysis (Sylmarx1.4 X Displacement)

  25. Analysis (Northridge-SPVx1.4 - X Displacement)

  26. Analysis (Mendocinox1.4- X Displacement)

  27. Analysis (Displacement Summary)

  28. Measured Response (Hysteretic)

  29. Conclusions From the analysis it was observed that the Mass Platform increased the response of the RC column due to Pdelta. Nevertheless, this effect was balanced by the action of the unbonded prestressed tendon inside the column. The final result, resemble approximately the behavior of a single column. Northridge at Sepulveda and Mendocino motions developed at UCLA, likewise El Centro and Kobe earthquakes, showed to induce considerable response for the single column analyzed.

  30. Future work We are working in the analytical stage to include bidirectional effects and model the behavior of Shear dominated columns, both for circular and interlocking columns. In few weeks we will start the construction of the Mass Platform and our first set of columns. We plan to test in summer.

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