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20th Annual CSCE Geotechnical Seminar
Geotechnical Aspects of Infrastructure
Adaptive Reuse of Holdredge Garage:
A Case Study in Geotechnical Engineering
and Historic Preservation
David Freed (Geotechnical Associate)
Amy Jagaczewski (Engineer)
GNCB Consulting Engineers, P.C.
Old Saybrook, CT
October 2017
October 2017
GNCB Consulting Engineers, P.C.
Old Saybrook, CT
Established 1965 – Structural Engineering
Geotechnical Engineering – Mid-1990s
Historic Preservation – Mid-1990s
Integration of Services at All Stages of
Design and Construction
October 2017
Project Outline
Building History
& Project Site
Soil Investigation & Foundation Selection
Condition Assessment
Structural Analysis & Design
Construction Challenges & Lessons Learned
Adaptive Reuse of Holdredge Garage
October 2017
Holdredge Garage Project Outline
Watch Hill, Westerly, RI
National Registered Historic District
NewPort Architecture, LLC (Architect)
Pariseault Builders (Contractor)
Stabilization and Adaptive Reuse
9 Conjoined Timber Frames (c. 1885)
21,000 square feet
$6 Million Construction Cost
Commercial and Residential Spaces
October 2017
Holdredge Garage Project Challenges
Structural
Vernacular architecture
Poor Existing Conditions
Hurricane & Flood Zone
Change of Use
Geotechnical
Tidal Deposits, Boulders & Fill
Historic Preservation
National Register Designation
Minimal Existing Documentation
October 2017
Building History
Watch Hill Historic District
Constructed c. 1885
Expanded throughout 19th & 20th Centuries
Multiple Uses – Stables, Housing, Garage
Abandoned 30 years
Approved for RI Historic Tax Credits, 2013
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
October 2017
Project Site
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
October 2017
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
Soil Investigation
October 2017
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
Soil Investigation
Summary of Subsurface Exploration
October 2017
Soil Investigation
Soil Profile A
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
October 2017
Soil Investigation
Soil Profile B
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
October 2017
Foundation Selection – Helical Piles
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
October 2017
Foundation Selection – Helical Piles
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
Boulders
Fill
Tidal Deposits
High Water Table
October 2017
Foundation Selection – Helical Piles
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
October 2017
Condition Assessment
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
Water Damage
Severe
Deformations
Barn-like
Framing
October 2017
Structural Analysis & Design –
Foundation
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
October 2017
Structural Analysis & Design –
Foundation
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
Footings + Caps
Grade Beams
Structural Slab
October 2017
Structural Analysis & Design –
Foundation
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
Piles + Caps
Grade Beams
Structural Slab
October 2017
Structural Analysis & Design –
Gravity System
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
Roof & Floor
Reinforcing
Truss
Reinforcing &
Replication
October 2017
Structural Analysis & Design –
Lateral System
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
Shear Wall
Reinforcing
Diaphragm Ties
X-Bracing
Drag Strut
October 2017
Construction Challenges
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
Lifting 9-Building Complex
Locating Piles around Boulders
High Water Table
Concealed Conditions
“Squaring” Existing Deformations
October 2017
Construction Challenges
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
October 2017
Benefits to Watch Hill
21,000 SF Reclaimed Space
3 Retail, Offices, Housing
Stabilized Historic Structure
Aesthetic Improvements to District
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
October 2017
Lessons Learned
Helical Pile foundations are suitable for
undesirable soil conditions and rehabilitation
projects.
Historic structures can be adapted to
modern uses using sensitive stabilization
methods.
The integration of geotechnical, structural,
and preservation engineering is a useful tool
in rehabilitation projects for existing
infrastructure.
Building History
Project Site
Soil Investigation
Foundation
Selection
Condition
Assessment
Analysis & Design
Construction
Challenges
Lessons Learned
October 2017
“The greenest building is the
one that is already built.”
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