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Joint Research of Seismic Retrofitting Technology for Existing Foundations

Joint Research of Seismic Retrofitting Technology for Existing Foundations. “Design and Execution Manual for Seismic Retrofitting of Existing Pile Foundations“. Masahiro Ishida Public Works Research Institute JAPAN. Ｈｏｋｋａｉｄｏ. Tokachioki EQ 2003. M8.0. Fri. 9/26/2003 4:50(JST).

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Joint Research of Seismic Retrofitting Technology for Existing Foundations

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  1. Joint Research of Seismic Retrofitting Technology for Existing Foundations “Design and Execution Manual for Seismic Retrofitting of Existing Pile Foundations“ Masahiro Ishida Public Works Research Institute JAPAN

  2. Ｈｏｋｋａｉｄｏ Tokachioki EQ 2003 M8.0 Fri. 9/26/2003 4:50(JST) Thu. 9/25/2003 11:50(PST) 2: Missing Over 300:Injured

  3. Damaged Freeway Bridge

  4. Nishinomiya Br.(Kobe EQ, 1995)

  5. Damaged Piles by Kobe EQ.

  6. Joint Research of Seismic Retrofitting Technology for Existing Foundations Public Works Research Institute Advanced Construction Technology Center Three years from 1999 Twelve Private Companies

  7. Outline of the Micropile Methods High Capacity Micropile ST Micropile Multi-Helix Micropile

  8. Major Experiments in this project

  9. Vertical Loading Tests

  10. Vertical Loading Tests

  11. Results * Ground Anchor Design and Execution Standards (JGS)

  12. Static Horizontal Loading Tests of Model Foundations with Piles of Different Diameters

  13. Static Horizontal Loading Tests 1/5 scale

  14. Static Horizontal Loading Tests

  15. Retrofitting Effects Model (1) Design Model • Rigid flame structure (2) Resistance properties in axis direction • Elasto-plastic model with limit of bearing capasity

  16. Micropile Exsiting Pile Front Pile Others Front Pile Others Sand Layer 1.00 0.50 1.00 0.50 (3) Resistance properties at right angles • Elasto-plastic model with limit of PHU • PHU is corrected by the ratio of the pile spacing and pile diameter • PHU is corrected by the ratio shown in the table

  17. (4) Bending moment – curvature relationship of micropiles • elasto-plastic model

  18. Summary • These results are reflected in “Design and Execution Manual for Seismic Retrofitting of Existing Pile Foundations with High Capacity Micropiles” • We will distribute the English version of the manual by CD-ROM after this session • Next speakers introduce further information of this manual

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