aisi nheri diaphragm supplement - cfsei on-demand
TRANSCRIPT
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AISI NHERI Diaphragm Supplement
June 30, 2020 Update to AISI
Hernan Castaneda1 and Kara D. Peterman2
1Graduate Research Assistant, University of Massachusetts Amherst2Assistant Professor, University of Massachusetts Amherst
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General Project Update
• We are all healthy and productive!
• Frontloading modeling efforts during Work From HomeJournal paper 1 (joist-ledger connections) on path to publication – coming soonThis summer, extended to full diaphragm system models predictions for future specimens
• Cantilever test rig (supported by SDI + Verco/Vulcraft) fabrication delayed due to COVID, design complete
Movement happening now things are opening up a bit
• Lab @UMass re-opened 06/22 at 25% capacity
• UCSD “latest and greatest” timeline: testing (in 6 DOF) Dec 2021/Jan 2022.
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Brack Lab (UMass): Diaphragm Test Rig Top view
Fix End
Actuator
Free End
Specimen
Frame
Pin
Connection
RollerFront view
Strong
Floor
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Brack Lab (UMass): Actuator and Roller Connection
Roller
Actuator
Bracket
Attachment
Support
Beam
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Brack Lab (UMass): Rollers
Prevent
Uplift
Roller Dolly, Swivel
Platform, 25000 lb.
3 ¼" Wheel Dia.
• Roller support aimed
at 10% of actuator
capacity: 10 kips
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Brack Lab (UMass): Rig – Fix Connection
Rig-Fixed Support
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Brack Lab (UMass): Rig – Actuator Connection
Rig-Actuator
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Brack Lab (UMass): Rig - Attachments
Rig-Specimen
Rig-Actuator Actuator-Support Beam Rig-Fixed Support
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Brack Lab (UMass): Rig – Specimen Width Flexibility
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Brack Lab (UMass): Test Rig [15’X15’] – Motion
• 10 in Stroke
• Δz = 0.26 in
• Tilt angle = 1° Click to play videos
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Brack Lab (UMass): Test Rig [10’X15’] – Motion
• 10 in Stroke
• Δz = 0.26 in
• Tilt angle = 1° Click to play videos
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Brack Lab (UMass): Test Rig
Fix Beam
Actuator
Support
Fix
Support
Free Beam
Transverse Beam
Roller
Support
Estimation of Weight, W:
Test Rig Frame
ComponentW
(lbs) (Kg)
Free Beam 2834 1286
Fix Beam 2558 1160
2 Transverse Beam 4019 1823
Total 9412 4269
Supports + Attachments + Plates
ComponentW
(lbs) (Kg)
Actuator Support 1002 455
2 Fix Support 1223 555
Roller Support 551 250
Total 2776 1259
Note:
- Weight is calculated assuming a density value of 0.2836 lbs/in3
- Nominal thickness of components varies between ¾” and ½”
- Some dimensions are approximated
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Ledger
(1200T200-97)
Clip-Angle
(1.5X1.5-54)
Ledger
(1200T200-97)
Joist
(1200S200-97)
Diaphragm FEM 9/16” Deck on CFS Joist: Geometry
• Material properties steel:• Shell Elements: S4R
• A three-dimensional Finite Element Model (FEM) was developed using ABAQUS.
- E = 29500 ksi
- Fy = 50/60 ksi (EPP)
- ν = 0.3
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Diaphragm FEM: Contact Interactions
• Contact behavior:
Clip-Angle
Ledger Web
Clip-Angle
Joist WebJoist Web
Ledger Web
Joist Flange
Ledger Flange
- Tangential:
C.O.F. = 0.2
- Normal:
Non-linear penetration pressure
Deck Side-Lap
Deck
Ledger Flange
Deck
Joist Flange
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Diaphragm FEM: Fastener Connections• Connector elements:
- Wires
Clip-Angle
Ledger Web
(Screw #10)
Clip-Angle
Joist Web
(Screw #10)
Ledger Flange
Joist Flange
(Screw #10)
Ledger Flange
Joist Flange
(Screw #10)
Multi-Linear
Elastic
Damage Failure
Node
iNode
j
Connector Element Behavior
Shear
(Tao 2017)
Shear
(Tao 2017)
Pull-Out
(Castaneda 2020)
zx
y
Fastener elastic behavior
Fastener Pull-Out 97-54
2
1Fo
rce,
P [
kN
]
0
3
Displacement, δ [mm]
06 12 18
P1
P2
P3
Ppeak
Pfinal
9754-R1
9754-R2
9754-R3
ABAQUS
Experimental response
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Support
Connection
(Screw #12)
Diaphragm FEM: Fastener Connections
Pattern 30/4
30”
Edge
Connection
@ 8” o.c.
(Screw #12)
Side-Lap
Connection
@ 12” o.c.
(Screw #10)
Support Connection Pattern
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“Fix” strips
@ 2 ft o.c.
[Ux=Uy=Uz=0]
Load strips
[Uy=Uz=0; Ux=Applied Displacement]
Diaphragm FEM: Loading and Boundary Conditions
End Ledger Web
[Uz=0]
End Ledger Web
[Uz=0]
x
z
P
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Diaphragm FEM: Results
Connector
Resultant Force
Stress Contour
Failure @
Corner Fastener
Failure @
Side-Lap Fastener
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Diaphragm FEM: Results
• Effect on fastener
modeling shear behavior:
- Ductile: Consider post
peak experimental
response
- Brittle: Fastener
suddenly fails upon
reaching peak
experimental response
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Diaphragm FEM: ResultsEdge Connection
@7.5”
Field Connection
@15”
3/8”
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Diaphragm FEM: Results
Joist @ 2ft
Joist @ 4ft
Joist @ 8ft
Warping
Warping
Buckling
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Diaphragm FEM: Results
Specimen 10ftX8ft: Joist @ 8ft
Ledger
Joist