Minnesota Twins Target Field & Post Tensioning


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Presentation by Neel Khosa given during the Post-Tensioning Institute's 2011 Technical Conference. Topic is about the use of unbonded post-tensioned concrete in Target Field stadium, home of the Minnesota Twins MLB team.

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  • Target Field – Minnesota TwinsPresenter by Neel Khosa, Vice President of AMSYSCO Inc.Presented at the 2011 Post-Tensioning Institute ‘Technical Conference’ for “Post-Tensioning, Design and Construction (part 1)” on May 3, 2011
  • Project Background, Construction Team, Design, Post-Tensioning
  • Coordination, Construction, Sustainability, Stadium Highlights, Grand Opening
  • Box Score is for the Minnesota Twins home opener against Boston Red Sox on April 12, 2010. (V) = BOS, (H) = MN
  • Walter P. Moore (structural engineer), Populous (architect), Mortenson Construction (construction manager), AMSYSCO Inc. (post-tensioning supplier)
  • Post-Tensioning supplier of Target Field was AMSYSCO, Inc. (www.amsyscoinc.com)
  • Quote from “Green ballpark showcases urban sustainability” Atlanta Business Chronicle by Giannina Smith
  • Stress 55 tendons with Main Concourse, 30 tendons with Club Level, 15 tendons with Suite Level, 30 tendons with Terrace Level.
  • Post-Tensioned Concrete Girders formed and poured ahead of time so that construction on upper levels could be expedited.
  • Entrance Promenade
  • Construction Worker Parade
  • Unfurling of U.S. Flag on field
  • National anthem by construction workers and suppliers
  • Stadium map of Main Concourse
  • Credits for information, logos, photos, etc.
  • Minny and Paulie (Minneapolis and St. Paul)
  • Minnesota Twins Target Field & Post Tensioning

    1. 1. TARGET FIELD<br />MINNESOTA TWINS<br />Post-Tensioning<br />“Design and Construction”<br />May 3, 2011<br />Neel Khosa, AMSYSCO Inc.<br />
    2. 2. 1st Inning : Project Background<br />2nd Inning : Construction Team<br />3rd Inning : Design<br />4th Inning : Post-Tensioning<br />
    3. 3. 5th Inning : Coordination<br />6th Inning : Construction<br />7th Inning : Sustainability<br />8th Inning : Stadium Highlights<br />9th Inning : Grand Opening<br />
    4. 4. Project Background<br />Minnesota Twins shared the Metrodome with Minnesota Vikings<br />1995 : Early plans to move<br />2005 : Deal between MN Twins and local Govt.<br />2006 : Minnesota state Govt. approved deal<br />2007 : Funding finalized and land acquired<br />2007 : Groundbreaking<br />Minnesota Twins vs. Boston Red Sox<br />Opening Day box score on April 12, 2010<br />
    5. 5. Project Background<br />Open Air Ballpark<br />
    6. 6. Project Background<br />Form Follows Function<br />Ballpark naming rights to Target Corporation<br />
    7. 7. Construction Team<br />
    8. 8. Construction Team<br />Owner(s)<br /> Minnesota Ballpark Authority<br /> Hennepin County<br />Architect(s)<br /> Populous<br />HGA<br />Structural Engineer<br /> Walter P. Moore<br />Construction Manager<br />Mortenson Construction<br />Post-Tensioning Supplier<br /> AMSYSCO Inc.<br />Post-Tensioning Installer<br />E&J Rebar<br />
    9. 9. Design of P.T.<br />Flat-plate Post-Tensionedsystem in Mezzanine level.<br />Post-Tensioned girdersin Concourses and some seating areas (with conventionally reinforced pan-formed beams and slabs).<br />
    10. 10. Design of P.T.<br />Post-Tensioning selected due to long-span capabilities and reducing concrete depth.<br />Heaviest Girder had 5,805 kips of Final P.T. Force.<br />Many girders required stage-stressing.<br />…<br /> “Site limitations and the ballpark layout dictated 28 main grandstand columns to be located directly atop the transit rail lines, so they were transferred with stage-stressed, post-tensioned girders that span up to 45 feet over the corridor to support the ballpark above.”<br />- Justin Barton (Walter P Moore)<br />
    11. 11. …<br />
    13. 13. Post-Tensioning<br />SYSTEM<br />0.5” Diameter 270 ksi PC Strand.<br />Unbonded 50 ML HDPE plastic-sheathing.<br />Encapsulated anchorage system for corrosion-protection.<br />REQUIREMENTS<br />Stressing to 33 kips when concrete reached 3000 psi compressive strength.<br />Elongation range ±7%<br />P.T. Supports at 48” o.c.<br />
    14. 14. Example of Anchor Detail which illustrates the stage-stressing sequence of a transfer girder.<br />
    15. 15. …<br />Post-Tensioning<br />Mezzanine Level<br /><ul><li>14” two-way PT slab
    16. 16. Irregular column layout
    17. 17. Banded PT in long-direction</li></li></ul><li>Post-Tensioning<br />Main Concourse Level<br /><ul><li>PT Girder System.
    18. 18. Most girders were stage-stressed while upper levels were poured.
    19. 19. Supported main pedestrian walkway within ballpark.
    20. 20. Champions Club</li></li></ul><li>Post-Tensioning<br />Club Level<br /><ul><li>PT Girders in one direction.
    21. 21. Supported secondary pedestrian walkway
    22. 22. Legend’s Club and Metropolitan Club are private lounges.</li></li></ul><li>Post-Tensioning<br />Suite Level and Terrace Level<br /><ul><li>Similar design but smaller than Club Level.
    23. 23. Cantilevered PT Girders had add tendons.</li></li></ul><li>Coordination<br />No repetition, every girder was unique.<br />Mortenson used BIM to model PT tendons using AMSYSCO’s CAD files.<br />Many conflicts solved during submittal process.<br />“The general who wins the battle makes many calculations before the battle is fought.”<br /> - Sun Tzu (Art of War)<br />
    24. 24. Why Coordination?<br />
    25. 25. Coordination<br />North/South P.T. girders (in orange) poured and stressed first in order to build upper levels.<br />N/S girders required pockets to sleeves E/W tendons.<br />East/West P.T. beams (in green) and mild-reinforced beams poured second.<br />
    26. 26. Construction<br />In order to meet Opening Day 2010, Construction had to start before Design was completed.<br />Target Field was built over a BNSF Railroad corridor. Post-Tensioning eliminated the need for re-shoring which kept the railroad operational during construction.<br />
    27. 27. Construction<br />Project finished 3 months ahead of schedule.<br />TIME-LAPSE VIDEO of the construction of Target Field on YouTube.<br />Post-Tensioning was used as a cost-effective construction method.<br />Target Field’s seating was built in several phases.<br />
    28. 28. Target Field was the 2nd MLB stadium to receive LEED certification.<br />Earned 36 points towards LEED Silver status.<br />Over 30% of construction materials were made from recycled content.<br />70% of construction waste was recycled or diverted locally.<br />Sustainability<br />
    29. 29. …<br />Sustainability<br />
    30. 30. Stadium Highlights<br />
    31. 31. Stadium Highlights<br />
    32. 32. Grand Opening<br />…<br />
    33. 33. Grand Opening<br />Minnesota Twins beat the Boston Red Sox 5-2 on April 12, 2010<br />
    34. 34. Grand Opening<br />
    35. 35. Grand Opening<br />…<br />
    36. 36. Grand Opening<br />…<br />
    37. 37. Credits<br />Sources<br />Project Background : http://en.wikipedia.org/wiki/Target_Field<br />Target Field rendering : http://www.minnesota.twins.mlb.com/min/ballpark/<br />Time-Lapse Video : YouTube via BenjaminLee Palmer<br />Sustainability Facts: http://2ndgreenrevolution.com/2010/04/12/twins-target-field-receives-leed-certification/<br />Stadium Highlights : http://www.minnesota.twins.mlb.com/min/ballpark/<br />Box Score (MN vs. BOS on April 12, 2010) : http://sports.yahoo.com/mlb/preview?gid=300412109<br />Quotes<br />Highlights<br />Images – Logos <br />AMSYSCO : http://www.amsyscoinc.com/index.php<br />Minnesota Twins : http://www.minnesota.twins.mlb.com<br />Mortenson Construction : http://www.mortenson.com/<br />Populous: http://www.populous.com/<br />Target Field : http://en.wikipedia.org/wiki/File:TargetField.PNG<br />Walter P Moore : http://www.walterpmoore.com/<br />Images – Photos<br />Target Field, Coordination, Sustainability, Grand Opening : Neel Khosa on April 3, 2010 (MN vs. STL)<br />Project Background : HOK/Populous<br />Metrodome : http://www.worldstadiums.com<br />Scoreboard: http://www.daktronics.com<br />Seating Profile, Stadium 3D Diagram : http://minnesota.twins.mlb.com/min/ballpark/ballpark_features.jsp<br />
    38. 38. THANK<br />YOU !!!<br />