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HEWLETT PACKARD BUILDING 5 SEISMIC UPGRADE CORVALLIS, OREGON, USA TOM A. ARMOUR, P.E.

SESSION III STRUCTURAL SUPPORT & SEISMIC APPLICATIONS IWM 2002 MAY 29 – JUNE 1, 2002. HEWLETT PACKARD BUILDING 5 SEISMIC UPGRADE CORVALLIS, OREGON, USA TOM A. ARMOUR, P.E. PROJECT SYNOPSIS “Foundation Design & Construction”. Voluntary Seismic Upgrade Program Braced Frame Retrofit Scheme

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HEWLETT PACKARD BUILDING 5 SEISMIC UPGRADE CORVALLIS, OREGON, USA TOM A. ARMOUR, P.E.

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  1. SESSION III STRUCTURAL SUPPORT & SEISMIC APPLICATIONS IWM 2002 MAY 29 – JUNE 1, 2002 HEWLETT PACKARD BUILDING 5 SEISMIC UPGRADECORVALLIS, OREGON, USATOM A. ARMOUR, P.E.

  2. PROJECT SYNOPSIS“Foundation Design & Construction” • Voluntary Seismic Upgrade Program • Braced Frame Retrofit Scheme • Foundation Support Required • Vibration and Noise Sensitivity • Access Issues • Strict Pile Deflection Criteria • Micropiles Most Feasible Option

  3. SUBSURFACE PROFILE“Ground Conditions” Soft Clayey Silt (ML) 8 m Medium Dense Sands (SP) 3 m Very Dense Sandy Gravels (GP)

  4. DESIGN SUMMARY“Foundation Support System” • Three Micropile Types • CASE 1 Type B micropiles • 135 total micropiles • Seismic Design Loads • Compression = 540 kN – 720 kN • Tension = 450 kN – 540 kN • Deflection Criteria • Verif. = 6.4 mm @ 900 kN Test Load (1.67 SDL) • Proof = 3.8 mm @ 810 kN Test Load (1.5 SDL) • New and Existing Pile Footings • 3 meters to Unlimited Headroom Access • Pile Load Test Program • One Each Verification Test to 200% SDL on Non-Production Piles • 5% Proof Tests on Production Piles

  5. 10 m Casing 140 mm to 178 mm x 10.5 mm to 16 mm wall casing Centralizer Med. Dense Sands Plunge Length Bond Zone 15 m Reinforcing Bar 50 mm & 63,5 mm Neat Cement Grout TYPICAL PILE DETAIL“H.P. Building 5”

  6. MICROPILE MATERIALS“H.P. Building 5” • Permanent Steel Pipe • API 5CT & ASTM A252 • 550 MPa yield • Flush joint threads • Steel Reinforcement • ASTM A615 • Mechanical coupling • Cement Grout • Neat cement – ASTM C150 • W/C ratio of 0.45 • 27,6 MPa (min)

  7. MICROPILE CONSTRUCTION“ H.P. Building 5”

  8. MICROPILE CONSTRUCTION“ H.P. Building 5”

  9. MICROPILE CONSTRUCTION“ H.P. Building 5”

  10. MICROPILE CONSTRUCTION“ H.P. Building 5”

  11. MICROPILE CONSTRUCTION“ H.P. Building 5”

  12. MICROPILE CONSTRUCTION“ H.P. Building 5”

  13. MICROPILE CONSTRUCTION“ H.P. Building 5”

  14. CONCLUSIONS“H.P. Building 5 Micropiles” • Another successful application of micropile use for seismic retrofit of sensitive buildings. • H.P. continuing to use micropiles on other building retrofits.

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