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2015 Structures Congress - One Jackson Square
The document details a case study of One Jackson Square, a luxury residential development in NYC, highlighting its construction challenges due to the subway tunnel below and a neighboring substation. Solutions included careful construction management, structural isolation from subway vibrations, and extensive monitoring during the building process. The project involved multiple stakeholders and required adherence to both zoning and historical preservation regulations.
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2015 Structures Congress - One Jackson Square
- 1. Case Study: OneJackson Square Philip Murray, PE Karl Rubenacker, PE, SE April 23RD , 2015 ASCE Structures Congress 2015
- 2. Project Team • Hines •KPF • SLCE • GMS • Flack & Kurtz • RA Consultants • Vollmer • Cerami • Hunter Roberts ASCE Structures Congress 2015
- 3. New Building Information •Luxury Residential Development • Condominium • ~ 3 dozen Apartments • 56,000 SF Residential • 9,000 SF ground floor retail • 11 Stories ASCE Structures Congress 2015
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- 5. Site Background Information •NYC Subway Eighth Ave. Line 1932 • NYC Sells Lot to Private Developer 1948 • Attempt at Development 1980 • Parking Lot Until this Project ASCE Structures Congress 2015
- 6. 20’ Site Plan Site Subway ASCE StructuresCongress 2015 Allowable Bldg Area 30’
- 7. Challenges • Subway tunnel belowtwo-thirds of site • MTA substation next door • >250,000 Riders pass under site each day ASCE Structures Congress 2015
- 8. More Challenges • HistoricLandmark District • Neighboring URM Buildings • Active Community • Straddles 2 Zoning Districts • Six-sided Irregular Lot ASCE Structures Congress 2015
- 9. Solutions • Sensitivity toNYCTA Issues during design • Care during construction • Structure vertical load within allowable • No lateral load imposed on tunnel • Isolation of the building from Subway Vibration ASCE Structures Congress 2015
- 10. NYC Transit ApprovalProcess • Multiple meetings w/NYCTA staff • Multiple drawing & calculation submittals • Adjustments to design • Duration ~ 9 months ASCE Structures Congress 2015
- 11. Subway Protection Measures •Preconstruction survey • Monitoring during construction • Limitation on equipment • Lateral support during excavation • Limitation on construction ASCE Structures Congress 2015
- 12. Monitoring • 15 pointsin tunnel • Twice/week during foundation work • Once/story during superstructure work • 3 months & 6 months after topping out ASCE Structures Congress 2015
- 13. Typical Floor Plan ASCE StructuresCongress 2015 Shear walls
- 14. Subway Roof Plan ASCE StructuresCongress 2015
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- 17. Foundation Plan ASCE Structures Congress2015 24” Dia Caisson In 30” Dia Sleeve 24” Dia Caisson
- 18. Foundation Cross- section ASCE Structures Congress2015 Springs Caissons
- 19. Caissons • 24 inchround caisson, reinforced concrete core • Socketed into the bedrock • Fixed top & bottom • Approx 40 kip lateral load • Approx 750 kip vertical load • Bedrock ~ 45’ below grade ASCE Structures Congress 2015
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- 21. Isolation Springs and Bearings ASCE StructuresCongress 2015 Isolation Spring Isolation Lateral Bracing
- 22. Isolators • Spring assemblypads used to isolate the building laterally from the subway tunnel • Reduces acoustic transmission, for residential viability • Lateral bearings provide resistance to base shear ASCE Structures Congress 2015
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- 24. Spring Assembly Pads ASCEStructures Congress 2015
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- 26. Lateral Bearings ASCE StructuresCongress 2015
- 27. Engineering Data • Buildingweight ~ 22,000 kip • Seismic base shear ~ 1000 kip (R=3) • Building period ~ 0.9 sec/cycle • Wind base shear ~ 500 kip • Wind base shear ~ 250 kip ASCE Structures Congress 2015
- 28. Superstructure Data • Concreteflat plate • Irregular column layout • Typically 8” slab thickness • Punching shear reinforcement • Transfer floor 16” thick ASCE Structures Congress 2015
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- 31. Thank You ASCE StructuresCongress 2015