Over-cladding for Thermal Performance and Building Resiliency JHH Nelson Harvey Building 1979 presenters: Daniel McKelvey AIA, LEED AP, NIBS David Copley AIA, LEED AP, CSI Allison Wilson, AIA, LEED AP BD+C JOHNS HOPKINS HOSPITAL NELSON-HARVEY BUILDING Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
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JOHNS HOPKINS HOSPITAL NELSON-HARVEY BUILDING … · 2016. 12. 16. · Thermal Performance and. Building Resiliency. JHH Nelson Harvey Building 1979 . presenters: Daniel McKelvey
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presenters:Daniel McKelvey AIA, LEED AP, NIBS David Copley AIA, LEED AP, CSI Allison Wilson, AIA, LEED AP BD+C
JOHNS HOPKINS HOSPITAL
NELSON-HARVEY BUILDING
Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
Presentation Outline• The aging building inventory• Challenges in design• Proposed over-cladding strategy• Digital tools required for analysis & design• Details of the over-cladding assembly• Sustainability metrics and energy modeling• Demolition to construction
Presentation outline
Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
West Façade of Nelson-Harvey Building in context with hospital campus
ZayedBuilding
Circa 2010CMSCBuilding
Circa 1960s
BillingsBuilding
Circa 1880s
Nelson HarveyBuilding
Circa 1970s
Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
Site aerial of project site – The Johns Hopkins Hospital System, Balt imore, Maryland
Thermal Performnce of the Exterior Envelopes of Whole Buildings XIII International Conference
East façade of Nelson-Harvey Building as viewed from entry forecourt
OslerBuilding
Circa 1930s
NelsonHarvey
BuildingCirca 1970sPhipps
BuildingCirca 1910s
Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
West façade of Nelson-Harvey Building as viewed from courtyard
NelsonHarvey
BuildingCirca 1970s
Roof of JeffersonBuilding
Circa 1950s
CMSCBuilding
Circa 1960s
HalsteadBuilding
Circa 1930s
CourtyardRoof of CAT scan
Terrace Restaurant
Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
Key Issues for DesignTechnical Challenges:
• Increase thermal performance• Masonry as predominant cladding material• Provide an air & water barrier• Provide fire / smoke containment to enhance
building resilience• Limit cladding system weight (5% dead load
threshold for steel structural members, 10% building lateral)
• Aggressive design & construction schedule• Lower 2 levels fully occupied & accessible during
construction• Limit disturbance to hospital operations
Key issues for design
Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
Typical Existing Wall• Masonry wall supported from steel lintels• Lack of masonry expansion joints• No insulation in cavity wall construction• Aging flashings • Parged cementitious coating on CMU as air
barrier• Thermally displaced masonry (no brick EJs)• Failing glazing system (non-insulating)• Exterior wall not code compliant for resisting
lateral imposed loads
Existing Condit ions
FireproofedSteel lintel
Composite slab
Composite slab
Steel structure
Ribbon windows
4” brick2” air space4” CMU w/parging
Ceiling & bulkhead
Steel structure
Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
Code & Performance Implications• Provide horizontal & vertical fire and smoke
separation in new and existing cladding.• Relieve lateral loading on existing envelope• Transfer lateral and gravity loads to steel
frame only• Comply with current Baltimore City Building
Code and ASHRAE standards• Achieve Baltimore City Green Building
Systems 2 Green Star certification (LEED Silver equivalent)
Building code and performance implications
Lateral force
Fire &Smoke
Convective air movement and stack effect
Solar heatgain
Moisture
Thermaltransfer
Heat loss
Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
Exterior Cladding SystemStrategy…• “Recycle in-place” the existing masonry and
and incorporate into new hybrid mass wall• Remove excess deadload from structure• Construct new structural frame for cladding -
outboard of existing wall face• Structural supports supporting precast needled
through existing wall to steel frame• Compartmentalize new and existing vertical &
horizontal cavities in exterior wallsNot viable:• Removing existing brick (and/ or) block and
reconstructing cavity wall
Employed envelope strategy
Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
“Recycle in-place” concept diagram for new cladding
New ‘outboard’ structural frame system
New steel outriggerwelded to existingstructural frame
Connection points to the existing structural frame-at the column with steel outriggers.
Existing masonrycavity wall
Existing steel& concretefloor deck
New cladding systems are supported from the frame
Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
View of exist ing elevation from Wolfe Street entry prior to demolit ion
ARTS + SCIENCES
Masonry Demolit ion shown in red Window and curtain wall demolit ion in blue
ARTS + SCIENCES
Patient Tower Wall Demolition• Remove failing fiber-fireproofing on steel• Remove all interior walls • Existing windows removed• Remove exterior masonry wall to just below
floor line at patient room areas• Selective demolition in masonry to expose
existing steel
Wall demolit ion at patient tower
Steel lintel
Composite slab
Composite slab
Steel structure
Ribbon windows
4” brick2” air space4” CMU w/parging
Ceiling & bulkhead
Steel structure
Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference
Materials PaletteWall systems• Precast panel - thin-brick mechanically bonded to thin-precast CFMF concrete panel.System thickness of 2-1/2” brick/concrete on 6” CFMF = 8 ½” overall thickness. • Aluminum curtain wall - thermally broken curtain wall with fluoropolymer coating,
insulating glazing, low-iron glass with ceramic frit and low-E coating• Metal panel system - aluminum panel with foamed-in-place poly-iso core on CFMF