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JEI Structural Engineering
Delegated Design of Glazing Systems
Stewart Jeske, MS, P.E.5/21/21
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Learning Objectives
1. Importance to design for building structural movement.
2. Understand design requirements for and limitations of glazing systems.
3. Know some important overlooked areas and what is not working in the delegated design process.
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Delegated Design Legal Definition
Is the shifting by contract law of various design responsibilities from the Architect/Engineer of record to the General Contractor.
Who is Delegating? – Structural Engineer of Record
90% of Façade Engineers have little to no understanding/experience in designing a building structure.
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What does Delegated Design Include?
Weather Sealant Included?
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What does Delegated Design Include?
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Vertical Deflection at the bottom of beams
Problematic with stick-built curtain wall limitations
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Splice
DL
Structural movement – Live Load Deflection of Spandrel Beams
Columns
SectionElevation
Curtain wallSpandrel
Beams
Spandrel
Beams
30’-0”
ΔLL
DL
WL
DL
Splice
Splice
Dead Load
Anchor
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Good reference: https://www.kawneer.com/kawneer/united_kingdom/catalog/pdf/brochures/kawneer_curtain_wall_systems_brochure_p10_p11_april_19.pdf
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Dead Load Anchors vs Wind Load Anchors
Dead Load (DL) Anchor – supports weight of curtain wall and wind loads.
Wind Load (WL) Anchors – only supports Wind loads. Has vertical slots.
DL anchor WL anchor
Movement splice
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Structural Beam Live Load (LL) Movement
Beam LL Movement= L/360 = (30’x12)/360 = 1.0”
IBC allows Structural Engineers to design building beams for
Live Load Movement of:
• L/360 for Floor beams
• L/240 for Roof beams
Actual beam live load movement is rarely given
in the structural drawings and requires an RFI
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Structural Drawings sometimes gives movement info
Most often they give only L/360 or nothing for vert movement.
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Dead Load
Anchor
1” Beam LL
Movement
What Vertical Structural Movement Can be Handled? (Manufactured Standard)
Glass Pocket
Maximum
Movement
Potential?
Mullion splice
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Dead Load
Anchor
1” Beam LL
Movement
What Vertical Structural Movement Can be Handled? (Stick Built)
Glass Pocket –
1/4” Max
Movement
Potential
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What LL Movement Can be Accommodated by Manufacturer Standard Systems?
Manufacturer
Quote
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What LL Movement Can be Accommodated by Manufacturer Standard Systems?
1/4” Max Allowed
Manufacturer
Shop Drawing
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What LL Movement Can be Accommodated by Manufacturer Standard Systems?
1/4” Max Allowed
Manufacturer
Shop Drawing
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What LL Movement is Assumed by manufacturers delegated design engineer?
Assumed??!!
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Question: Are Manufacturers doing full delegated structural design required by specs?
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Solution 1 -Stacking Stick Built CW- Low Rise (3 or 4 stories)
Movement joints in green
DL at base
Roof Line
2nd FloorWind Load anchors at
Floors
Large joint at Roof Line
for expansion & Structure
movement
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Solution 2 – Horizontal w/ Silicone Sheet at each floor line
Silicone Sheet
Large Site Line! –
3” to 4”
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What Vertical Structural Movement Can be Handled? (Unitized Curtain Wall)
Chicken Head
– ¾” to 1 ½”
Movement Potential DL Anchor
1” Beam LL
Movement
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Stool Trim Detail – WL anchor
Wind load
anchor
movement
Structure
moves
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What about sealant failure?
Who has responsibility to design the joint & sealant?
Possible solutions:
Tremco ETA
Joint sealant can
crush only 50%
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Head Joint Design For Movement
Design of joints is critical and should not be left for the end of the project during construction!
Ref. Dow Cornings website for sizing formula
Also Reference AISC Design of Façade Connections
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Solution Head Detail – Silicone Membrane
Silicone Sheet
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EMSeal joint for Curtain Wall
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What about Storefront and Structural Movement?
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What about Storefront Head Joints
Is this a
movement
joint?
21’- 4”
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What about Storefront Head Joints?
CF Steel
framing
Header
spans up
to 16-18 ft
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What about Storefront and Structural Movement?
AE SHOWS FIXED/SHIMMED
JOINT – 0” MOVEMENT!
1” Beam LL
Movement
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Cold Formed Steel Deflection Track/Slip Track
(only where openings are less than ~ 18’)
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Studs w/no slip track (Hung from Structure)
Roof Snow/LL/Wind
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Dedicated Wind Girt (Steel Tube – column to column)
(no vertical floor or roof movement)
Dedicated Wind Girt
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Structural
Movement?
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Roof Snow/LL/Wind
Floor LL
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Roof Snow/LL/Wind
Watch out for Canopys
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How can you know if you need a receptor head for SF?
1/2” Max Allowed
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Some rules of thumb for storefront/receptor need:
If a canopy is overhead – vert. movement likely
Openings longer than 18’ – vert. movement likely
If dedicated wind girts – no vert. movement
Precast tilt up walls – likely no vert. movement
Get an engineer who knows structures
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International Building Code:
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Story Drift – (lateral movement of building)
BIG ISSUE in Seismic Regions
Typ seismic drift allowed
is about H/50 or .02 x H
So for H= 12’
.02 H = 2.88” of Drift
H
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Story Drift – (lateral movement of building)
So say H = 14’, then Drift is = 14’x 12 x .02 = 3.36” Seismic story drift
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1) Check delta fall out (clearance)
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ASCE 7 min Design Loads for Buildings:
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What is fallout:
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1) Check delta fall out (clearance)
2) Check for system AAMA
501.6 testing3) Check EOR for actual
Seismic calcs & location
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AAMA 501.6 Testing:
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Unitized stack joint does well for lateral
Dead load
anchor
movement
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At punched openings!
Receptors needed Movement Joint
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Fins – care should be taken.
Lateral deflection issues due to wind!
Lateral movement
Must maintain 75% bite
Wind
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Corners should be modeled – return loads
Return can pull
away from wall
Wind
Wind
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Corners should be modeled
+ and – load combination
+ Wind
- Wind
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Jamb Mullion Movement
50% Movement Sealant
100% Movement Sealant
.56 in
Mullion
Moves
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Careful!
Running Horizontals
Through
Structural Engineer of
Record may not have
accounted for load at the
jambs
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088000 Specifications – IGU’s
Should require submittal based off of ASTM E-1300
Important for SSG systems!
Window Glass
Design Software
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088000 Specifications – SSG Systems
SSG (Structural Sealant Glazed Systems)
Structural Silicone “Bite” needs engineering design
Secondary Sealant in IGU needs to be designed – ASTM C1249
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Framing Layouts to Avoid
Beam behind
system
required
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Differential Movement in Curtain Wall
Cantilever Area
Moves (LL)
Double Mullion
Required with
Movement Joint
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Connections to Avoid
A brace is required to
connect to the bottom
½ of a structural beam
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Sunshades – care should be taken. Snow loads and ice considered
Snow drift!
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Canopies and Handrail Point Supported Analysis showing holes is required
Show difference
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Delegated Design of Manufactured Systems
Building Structural Movement Limitations
Lateral Load Limitations
Design of Insulated Glass Units
Delegated Design of Structural Glass
Recommendations for Delegated Design
Questions?
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Façade Design/Engineering Services
Curtainwall & Storefront
Structural Glass Systems (Fins)
Glass Stairs & Floors
Glass Railings
All-Glass Entry/Walls
Glass Canopys & Skylights
Zoo/Aquarium Exhibit Glazing
Façade Panel Systems
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J-Edge Anchor System – Tech Rep.
New Pour Stop with Anchor
Eliminates Field welding
Eliminated slab embeds
Saves Time & Costs
Free presentation!
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