1 / 29

UH-Contribution Ravi Mullapudi Parnak Charkhchi Ashraf Ayoub

NEES - Jan 23, 2008. UH-Contribution Ravi Mullapudi Parnak Charkhchi Ashraf Ayoub. OUTLINE. Combined Bending/Shear Modified Compression Field Theory (MCFT) Rotating Angle Softened Truss Model (RA-STM) Fixed Angle Softened Truss Model (FA-STM) Soften Membrane Model (SMM)

juliet
Download Presentation

UH-Contribution Ravi Mullapudi Parnak Charkhchi Ashraf Ayoub

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NEES - Jan 23, 2008 UH-Contribution Ravi Mullapudi Parnak Charkhchi Ashraf Ayoub

  2. OUTLINE • Combined Bending/Shear • Modified Compression Field Theory (MCFT) • Rotating Angle Softened Truss Model (RA-STM) • Fixed Angle Softened Truss Model (FA-STM) • Soften Membrane Model (SMM) • Comparison between Models • Seismic Analysis – Numerical Results • Combined Torsion/Bending/Shear • Discretization of Section in 2D/3D Regions • 3D Constitutive Models • Section Analysis • Numerical Results • On-Going Work • Beam Element under Combined Torsion/Bending/Shear • Seismic Analysis • OpenSees

  3. Modified Compression Field Model Rotating Angle- Softened Truss Model

  4. SOFTEN TRUSS MODEL -Principle Concrete Element • Shear stress along crack ≠ 0  Vc • Biaxial Stress & Strain • Smeared Approach SOFTEN Membrane MODEL • Hsu/Zhu Poisson Ratio

  5. NUMERICAL RESULTS – USC Shear-Critical Column = 86 MPa Xiao and Martirossyan Longitudinal yield stress = 510 MPa Transverse yield stress = 449 MPa

  6. NUMERICAL RESULTS Effect of Different Models Monotonic Analysis with different Elements HC4-8L16-T6-0.1P Column

  7. NUMERICAL RESULTS Hoop Strain Distributions HC4-8L16-T6-0.1P Column

  8. NUMERICAL RESULTS – Cyclic Load Displacement Axial Load = 1068 kN USC Column Flexure Element • Flexure element is unable to predict the correct behavior

  9. NUMERICAL RESULTS – Cyclic Load Displacement Axial Load = 1068 kN USC Column Shear Element HC4-8L16-T6-0.2P Column • Shear element is able to predict the correct behavior

  10. NUMERICAL RESULTS Shear Element Load Displacement Dynamic Shear Analysis HC4-8L16-T6-0.1P Column

  11. – Earthquake Analysis – Load vs. Deformation NUMERICAL RESULTS HC4-8L16-T6-0.1P Column El Centro Record

  12. = 22 MPa NUMERICAL RESULTS – Shear-Critical Column Aboutaha et al. Longitudinal yield stress = 434 MPa Transverse yield stress = 400 MPa

  13. NUMERICAL RESULTS – Shear Element Load Displacement 48” Column Syracuse Column Axial Load = 0 kN • Due to weak axis loading, Pinching is high

  14. NUMERICAL RESULTS – Shear and Flexure Element 48” Column Syracuse Column Axial Load = 0 kN • Flexure element is unable to predict the correct behavior

  15. NUMERICAL RESULTS – Earthquake Analysis – Time History 48” Column Syracuse Column Shear Analysis Assumed Axial Load = 0.1 fc Ag = 205.5 kN 2 * EL Centro (1940) record

  16. – Earthquake Analysis – Load vs. Deformation NUMERICAL RESULTS SC3 Column Shear Dynamic 2*El-Centro

  17. NUMERICAL RESULTS – Earthquake Analysis – Time History Syracuse Column Flexure and Shear Analysis Assumed Axial Load = 0.1 fc Ag = 205.5 kN 2 * EL Centro (1940) record

  18. Shell Region Core Region Transverse Reinforcement 1% Longitudinal Reinforcement 2% 406.4 mm Dia. NUMERICAL RESULTS – UNR Column Axial Load = 355 kN Vu Phan et al. 36.3 N – S2/mm 1829 mm EL Centro NS

  19. NUMERICAL RESULTS – Earthquake Analysis EL Centro (1940) record UNR Column- 9F1 Experiment

  20. NUMERICAL RESULTS – Earthquake Analysis EL Centro (1940) record UNR Column

  21. Shear Element Load Displacement NUMERICAL RESULTS UNR Column 9S1 Deflection for 2.0*El Centro

  22. Torsion Basic Equations Equilibrium Compatibility

  23. Torsional Section Discretization 2D/3D Regions

  24. 3D Constitutive Model – Vecchio and Selby Approach (1991) • No Complete 3D- Model available • Assuming the same relation ship for intermediate stress calculation • Implemented the 3D procedure to SMM

  25. Torsional Section Fiber Section Analysis

  26. Numerical Results Pure Torsion Box Section

  27. Numerical Results

  28. Numerical Results - Combined Torsion/Bending 5, #9 bars #4 hoops @ 5” 24” 12”

  29. Schedule of On-Going Work

More Related