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.”