Remediation a Timber Barrel Arch Field House

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Remediation a Timber Barrel Arch Field House
Due to Water Infiltration and Deterioration
Presented by Ken Maschke Ed Swierz
SEI Structures Congress - May 19, 2007
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Walter Payton Center

• Remediation Team
• Goettsch Associates - Architect
• ET Environmental Environmental Consultant
• Barton Mallow Construction - GC
• W. W. Timbers, Inc. Timber Erector
• Douglas Stadelmann Timber Detailer
• Brandenburg Demolition Contractor

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Walter Payton Center

• Thornton Tomasetti Staff
• Edward J. Swierz Project Manager
• Steve Shanks Project Engineer
• Ken Maschke Engineer
• Zelina Laube Engineer
• Larry Hunt Technician
• Jaime Melendez Drafter

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Walter Payton Sweetness

• Running Back, Chicago Bears
• NFL Career Rushing Leader Upon Retirement
• Founded Walter Payton Cancer Fund
• Advocate of Organ Transplantation
• Died of Rare Liver Disease, November 1999

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Walter Payton Center

• Chicago Bears Football Club Practice Facility
• Houses a Full Football Field Locker Rooms
• Opened in 1998

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Walter Payton Center

• Barrel Arch 200 x 400 x 85 High
• Three Hinge Glu-lam Arches Southern Pine, 24F
• Timber Purlins, Tongue-in-Groove Decking, and
  Plywood Sheathing
• Translucent Fabric Roof
• Only Timber Structure in Use by the NFL

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Walter Payton Center

• 21 Arches at 20-0 on Center

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Walter Payton Center

• Fabric Roof Anchored with Steel Cables

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The Clients Problem
Water Infiltration
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The Clients Concern
Player Safety
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Investigation

• How to Trace the Problem
• Review the Drawings
• Start at the Top and around Areas of Leaks
• Diagnose through Selective Removal
• Water Testing if Beneficial.

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Investigation

• Investigate Active Leaks
• Look for other Entry Points

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Investigation

• Trace Origins of Staining on Arches

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Investigation

• Review As-built Details
• Penetrations through Roof Sheathing

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Walter Payton Center
Investigation
Corrugated Metal Sheeting
Plywood Decking
Tongue-in-Groove Plank
Glued Laminated Arch

• Probe Depth of Decay

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Investigation

• Wood and Moisture
• Harvested at 30 or more
• Kiln dried to 15 19
• Service moisture 7-8, depends on locale
• Decay starts with MC at over 20
• Dry Rot is actually fungal and bacterial decay
  supported by proper temperatures and sufficient
  moisture

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Investigation
Fabric Roof Above
Legend
gt 20 Moisture Content
Arch, Typical
17-19 Moisture Content
15-17 Moisture Content
lt 15 Moisture Content

• Moisture Measurements by ET Environmental
• Reading taken in Tongue-in-groove from Inside
• Data Suggests Areas of Greatest Deterioration

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Repair Program
Developed with Goettsche Partners

• Repair and restore the structure
• In fill the former fabric area with a hard
  surface
• Install a new standing seam roof
• Install a new HVAC system to control humidity
• Install new end walls
• Revise lighting system
• Install a new playing surface.

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Repair Program
TTG Responsibilities

• Repair and restore the structure
• Develop details to restore the arches and purlins
• In fill the former fabric area with a hard
  surface
• Field review of all arches to determine the
  appropriate repair
• Complete by training camp in July

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Analysis and Design

• Three Hinge Arch Behavior

Hinge
Drag Strut
Moment Splice
Hinge
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Analysis and Design

• Arch Depth Varies along Curve
• 5-1 Maximum 3-0 Minimum
• Approx 4-9 at Area of Greatest Deterioration

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Analysis and Design

• Maximum Moment Due to Unbalanced Snow
• Arches Experience both Positive and Negative
  Moment

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Analysis and Design

• Deterioration Reduces Moment Capacity

• Estimate Amount of Deterioration in Each Arch
• Use Sounding Technique Verify with Coring

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Analysis and Design

• Remove Deteriorated Wood
• Replace with New Timber
• Timber Adhesive Timber Lock Screws
• Deterioration lt 9 Required No Reinforcing

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Analysis and Design

• Design Reinforcement for Strain Compatibility
• FRP Wrap Considered
• Steel Cover Plate Solution Selected

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Analysis and Design

• Cover Plate Detail for Moment Capacity

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Analysis and Design

• Cover Plates in the Field

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Analysis and Design

• Reinforce Splice Due to Deterioration
• Location of Reinforcement Plate Reduces Moment
  Arm

Top Tension Plate
Existing Shear Plate Connector
Bottom Tension Plate
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Analysis and Design

• Field Repair of Moment Splice

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CA Phase

• Full time field presence
• On call to examine all new areas
• Record all repair types, locations and quantities
• Create solutions on the fly.

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CA Phase

• Replace the existing fabric roof
• Oversee installation of new hard roof

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CA Phase

• Difficult to Access Most Deteriorated Areas

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CA Phase

• Mark Deteriorated Plywood for Removal
• Record Quantities Removed

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CA Phase

• Heavy Deterioration of Tongue-in-Groove at Anchor
  Points

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CA Phase

• Record and Quantify Demo of Plywood and
  Tongue-in-Groove

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CA Phase

• Fabric Roof Removed as Demo Proceeds
• New and Remaining Timber to be Protected

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CA Phase

• Diaphragm Continuity Compromised by Demo
• At Least 8 Consecutive Bays on Each Side of the
  Arch Must be Fully Clad throughout Work

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CA Phase

• Plywood Sheathing, Purlins, and Drag Strut
  Provide Lateral Diaphragm Between Arches
• Must Maintain Diaphragm During Construction

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CA Phase

• Deterioration Greater than 11 into Arch

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CA Phase

• Dental-like removal of deterioration in the Arch

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CA Phase

• Result of Removing Deterioration from Purlins

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CA Phase

• Timberloks and Gorilla Glue

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CA Phase

• End Arch Heavily Deteriorated
• At Bottom Shoe
• And Splice Location

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CA Phase

• End Arch Partially Replaced
• New Splice Location

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CA Phase

• Record and Monitor Demo and Repair Work Performed
  on Arches

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Project Completion

• Summary of Repairs
• 39,000 Square Feet of Plywood
• 9,560 Square Feet of Tongue-in-Groove
• 3 Arch Segments Required Cover Plates
• 37 Arch Segments had Deterioration Deeper than 4
  Inches
• 22 Arch Segments Required Reinforcing at the
  Moment Splice

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Project Completion

• Roof In-filled
• Arches Repaired

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Project Completion

• Practice Facility Operational
• Keep Players Warm During Playoff Run

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Project Completion
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Questions?