AISI NHERI Diaphragm Supplement June 30, 2020 Update to AISI Hernan - - PowerPoint PPT Presentation

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AISI NHERI Diaphragm Supplement June 30, 2020 Update to AISI Hernan - - PowerPoint PPT Presentation

Oct 02, 2023 46 likes •278 views

AISI NHERI Diaphragm Supplement June 30, 2020 Update to AISI Hernan Castaneda 1 and Kara D. Peterman 2 1 Graduate Research Assistant, University of Massachusetts Amherst 2 Assistant Professor, University of Massachusetts Amherst General Project

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SLIDE 1

AISI NHERI Diaphragm Supplement

June 30, 2020 Update to AISI Hernan Castaneda1 and Kara D. Peterman2

1Graduate Research Assistant, University of Massachusetts Amherst 2Assistant Professor, University of Massachusetts Amherst

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SLIDE 2

General Project Update

  • We are all healthy and productive!
  • Frontloading modeling efforts during Work From Home

Journal paper 1 (joist-ledger connections) on path to publication – coming soon This 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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SLIDE 3

Brack Lab (UMass): Diaphragm Test Rig

Top view Fix End Actuator Free End Specimen Frame Pin Connection Roller Front view Strong Floor

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SLIDE 4

Brack Lab (UMass): Actuator and Roller Connection

Roller Actuator Bracket Attachment Support Beam

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SLIDE 5

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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SLIDE 6

Brack Lab (UMass): Rig – Fix Connection

Rig-Fixed Support

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SLIDE 7

Brack Lab (UMass): Rig – Actuator Connection

Rig-Actuator

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SLIDE 8

Brack Lab (UMass): Rig - Attachments

Rig-Specimen Rig-Actuator Actuator-Support Beam Rig-Fixed Support

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SLIDE 9

Brack Lab (UMass): Rig – Specimen Width Flexibility

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SLIDE 10

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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SLIDE 11

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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SLIDE 12

Brack Lab (UMass): Test Rig

Fix Beam Actuator Support Fix Support Free Beam Transverse Beam Roller Support Estimation of Weight, W:

Test Rig Frame Component W (lbs) (Kg) Free Beam 2834 1286 Fix Beam 2558 1160 2 Transverse Beam 4019 1823 Total 9412 4269 Supports + Attachments + Plates Component W (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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SLIDE 13

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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SLIDE 14

Diaphragm FEM: Contact Interactions

  • Contact behavior:

Clip-Angle Ledger Web Clip-Angle Joist Web Joist 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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SLIDE 15

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 i Node j Connector Element Behavior

Shear

(Tao 2017)

Shear

(Tao 2017)

Pull-Out

(Castaneda 2020)

z x y

Fastener elastic behavior

Fastener Pull-Out 97-54

2 1

Force, P [kN]

3

Displacement, δ [mm]

6 12 18

P1 P2 P3 Ppeak Pfinal

9754-R1 9754-R2 9754-R3 ABAQUS

Experimental response

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SLIDE 16

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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SLIDE 17

“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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SLIDE 18

Diaphragm FEM: Results

Connector Resultant Force Stress Contour Failure @ Corner Fastener Failure @ Side-Lap Fastener

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SLIDE 19

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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SLIDE 20

Diaphragm FEM: Results

Edge Connection @7.5” Field Connection @15”

3/8”

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SLIDE 21

Diaphragm FEM: Results

Joist @ 2ft Joist @ 4ft Joist @ 8ft

Warping Warping Buckling

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SLIDE 22

Diaphragm FEM: Results

Specimen 10ftX8ft: Joist @ 8ft

Ledger Joist

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SLIDE 23

Comments / Questions?

Email me: kdpeterman@umass.edu