1. 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

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

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

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

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

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

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

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