Minnesota Twins Target Field & Post Tensioning

TARGET FIELD
MINNESOTA TWINS
Post-Tensioning
“Design and Construction”
May 3, 2011
Neel Khosa, AMSYSCO Inc.

1st Inning : Project Background
2nd Inning : Construction Team
3rd Inning : Design
4th Inning : Post-Tensioning

5th Inning : Coordination
6th Inning : Construction
7th Inning : Sustainability
8th Inning : Stadium Highlights
9th Inning : Grand Opening

Project Background
Minnesota Twins shared the Metrodome with Minnesota Vikings
1995 : Early plans to move
2005 : Deal between MN Twins and local Govt.
2006 : Minnesota state Govt. approved deal
2007 : Funding finalized and land acquired
2007 : Groundbreaking
Minnesota Twins vs. Boston Red Sox
Opening Day box score on April 12, 2010

Project Background
Open Air Ballpark

Project Background
Form Follows Function
Ballpark naming rights to Target Corporation

Construction Team

Construction Team
Owner(s)
Minnesota Ballpark Authority
Hennepin County
Architect(s)
Populous
HGA
Structural Engineer
Walter P. Moore
Construction Manager
Mortenson Construction
Post-Tensioning Supplier
AMSYSCO Inc.
Post-Tensioning Installer
E&J Rebar

Design of P.T.
Flat-plate Post-Tensionedsystem in Mezzanine level.
Post-Tensioned girdersin Concourses and some seating areas (with conventionally reinforced pan-formed beams and slabs).

Design of P.T.
Post-Tensioning selected due to long-span capabilities and reducing concrete depth.
Heaviest Girder had 5,805 kips of Final P.T. Force.
Many girders required stage-stressing.
…
“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.”
- Justin Barton (Walter P Moore)

…
EXAMPLE OF STAGE-STRESSING IN BEAM SCHEDULE

Post-Tensioning
SYSTEM
0.5” Diameter 270 ksi PC Strand.
Unbonded 50 ML HDPE plastic-sheathing.
Encapsulated anchorage system for corrosion-protection.
REQUIREMENTS
Stressing to 33 kips when concrete reached 3000 psi compressive strength.
Elongation range ±7%
P.T. Supports at 48” o.c.

Example of Anchor Detail which illustrates the stage-stressing sequence of a transfer girder.

…
Post-Tensioning
Mezzanine Level
14” two-way PT slab
Irregular column layout
Banded PT in long-direction

Post-Tensioning
Main Concourse Level
PT Girder System.
Most girders were stage-stressed while upper levels were poured.
Supported main pedestrian walkway within ballpark.
Champions Club

Post-Tensioning
Club Level
PT Girders in one direction.
Supported secondary pedestrian walkway
Legend’s Club and Metropolitan Club are private lounges.

Post-Tensioning
Suite Level and Terrace Level
Similar design but smaller than Club Level.
Cantilevered PT Girders had add tendons.

Coordination
No repetition, every girder was unique.
Mortenson used BIM to model PT tendons using AMSYSCO’s CAD files.
Many conflicts solved during submittal process.
“The general who wins the battle makes many calculations before the battle is fought.”
- Sun Tzu (Art of War)

Why Coordination?

Coordination
North/South P.T. girders (in orange) poured and stressed first in order to build upper levels.
N/S girders required pockets to sleeves E/W tendons.
East/West P.T. beams (in green) and mild-reinforced beams poured second.

Construction
In order to meet Opening Day 2010, Construction had to start before Design was completed.
Target Field was built over a BNSF Railroad corridor. Post-Tensioning eliminated the need for re-shoring which kept the railroad operational during construction.

Construction
Project finished 3 months ahead of schedule.
TIME-LAPSE VIDEO of the construction of Target Field on YouTube.
Post-Tensioning was used as a cost-effective construction method.
Target Field’s seating was built in several phases.

Target Field was the 2nd MLB stadium to receive LEED certification.
Earned 36 points towards LEED Silver status.
Over 30% of construction materials were made from recycled content.
70% of construction waste was recycled or diverted locally.
Sustainability

…
Sustainability

Stadium Highlights

Grand Opening
…

Grand Opening
Minnesota Twins beat the Boston Red Sox 5-2 on April 12, 2010

Grand Opening

Grand Opening
…

Credits
Sources
Project Background : http://en.wikipedia.org/wiki/Target_Field
Target Field rendering : http://www.minnesota.twins.mlb.com/min/ballpark/
Time-Lapse Video : YouTube via BenjaminLee Palmer
Sustainability Facts: http://2ndgreenrevolution.com/2010/04/12/twins-target-field-receives-leed-certification/
Stadium Highlights : http://www.minnesota.twins.mlb.com/min/ballpark/
Box Score (MN vs. BOS on April 12, 2010) : http://sports.yahoo.com/mlb/preview?gid=300412109
Quotes
Highlights
Images – Logos
AMSYSCO : http://www.amsyscoinc.com/index.php
Minnesota Twins : http://www.minnesota.twins.mlb.com
Mortenson Construction : http://www.mortenson.com/
Populous: http://www.populous.com/
Target Field : http://en.wikipedia.org/wiki/File:TargetField.PNG
Walter P Moore : http://www.walterpmoore.com/
Images – Photos
Target Field, Coordination, Sustainability, Grand Opening : Neel Khosa on April 3, 2010 (MN vs. STL)
Project Background : HOK/Populous
Metrodome : http://www.worldstadiums.com
Scoreboard: http://www.daktronics.com
Seating Profile, Stadium 3D Diagram : http://minnesota.twins.mlb.com/min/ballpark/ballpark_features.jsp

THANK
YOU !!!

Minnesota Twins Target Field & Post Tensioning

by Amsysco, Inc. on May 04, 2011

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