END PLATE STABILITY IN THERMALLY-IMPROVED CLADDING DETAILS Kara - - PowerPoint PPT Presentation

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END PLATE STABILITY IN THERMALLY-IMPROVED CLADDING DETAILS Kara - - PowerPoint PPT Presentation

Mar 25, 2024 190 likes •385 views

END PLATE STABILITY IN THERMALLY-IMPROVED CLADDING DETAILS Kara Peterman, Ph.D., Assistant Professor Dept. of Civil and Environmental Engineering, University of Massachusetts Amherst Formerly Postdoctoral Research Associate Dept. of Civil and

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SLIDE 1

END PLATE STABILITY IN THERMALLY-IMPROVED CLADDING DETAILS

Kara Peterman, Ph.D., Assistant Professor

  • Dept. of Civil and Environmental Engineering, University of Massachusetts Amherst

Formerly Postdoctoral Research Associate

  • Dept. of Civil and Environmental Engineering, Northeastern University

Mark D. Webster, P.E., SECB, LEED AP BD+C, Senior Staff II – Structures Simpson Gumpertz & Heger, Inc. James D’Aloisio, P.E., SECB, LEED AP BD+C, Principal Klepper, Hahn & Hyatt Jerome F. Hajjar, Ph.D., P.E., CDM Smith Professor and Chair

  • Dept. of Civil and Environmental Engineering, Northeastern University
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SLIDE 2

FUNDING SOURCES IN-KIND FUNDING

SUPPORT

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SLIDE 3

INDUSTRY ADVISORY PANEL

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SLIDE 4

THERMAL BRIDGES AND BREAKS

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SLIDE 5

CLADDING DETAILS

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SLIDE 6

EXPERIMENTAL PROGRAM

FRP CREEP TESTING (PROLONGED LOADING) BOLTED CONNECTIONS WITH NON-STEEL FILLS (MONOTONIC) SLAB- and KICKER-SUPPORTED SHELF-ANGLES (MONOTONIC) ROOF POSTS (MONOTONIC & CYCLIC) CANOPY BEAMS (MONOTONIC & CYCLIC)

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SLIDE 7

CONNECTION

  • Bolt diameter
  • Bolt base metal

material (A325, A307, B8 Class 2/A304-SH1)

  • Posts/beams: base

plate thickness

MEMBER SIZE

  • Shelf angles:

corresponds to insulation requirements

  • Posts/beams:

dependent on loading

MITIGATION STRATEGY

  • FRP shims in bolted

connections

  • Stainless steel shims/HSS

“tube shims”

  • FRP structural member (full
  • r partial replacement)

FRP MATERIAL

  • 3 off-the-shelf pultruded

plates: polyurethane, vinylester, phenolic

  • 2 proprietary products
  • Pultruded shapes all

vinylester

GENERAL COMMENTARY

  • Thermal break mitigation strategy assumed to fit geometric constraints of original detail.
  • Thermal modeling limited to realistic, designed, constructible details.
  • Structural testing involves both “designed” and “over-designed” specimens.

EXPERIMENTAL PROGRAM

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SLIDE 8

TEST MATRIX / ROOF POSTS / CANOPY BEAMS

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SLIDE 9

TEST RIG / ROOF POSTS / CANOPY BEAMS

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SLIDE 10

INSTRUMENTATION PLAN

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SLIDE 11

RESULTS

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SLIDE 12

force [kip] force [kip]

RESULTS

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SLIDE 13

RESULTS

OBSERVED LIMIT STATES Base plate buckling/yielding Bolt tension Bolt bending Bolt tension + bending Shim compression Post/beam buckling Post/beam bending Weld fracture

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SLIDE 14

BASE PLATE BUCKLING

Presence of FRP shims does not impact base plate stability modes

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SLIDE 15

ROOF POSTS - MEASURED STRENGTH RESULTS BASE PLATE YIELDING SHIM COMPRESSION

Test

Pmax Rf h Mu Pn Pu Pu/Pn Pn PuB PuA PuB + PnA (PuB + PnA)/Pn Name kip

  • in

kip-in kip kip

  • kip

kip kip kip

  • R1

5.334 0.85 21 95.21 17.58 5.33 0.30

  • 15.87

10 25.87

  • R2

8.339 0.85 21 148.85 46.92 8.34 0.18 2315 24.81 10 34.81 0.02 R3 4.39 1 21 92.19 17.58 4.39 0.25

  • 15.37

10 25.37

  • R4

5.567 0.85 21 99.37 17.58 5.57 0.32

  • 16.56

10 26.56

  • R5

8.69 0.85 15 110.80 46.92 8.69 0.19 2315 18.47 10 28.47 0.01 R6 5.88 1 15 88.20 17.58 5.88 0.33

  • 14.70

10 24.70

  • R7

6.88 0.95 21 137.26 46.92 6.88 0.15

  • 22.88

10 32.88

  • R8

9.29 0.95 15 132.38 46.92 9.30 0.20 2315 22.08 10 32.08 0.01 R9 6.438 0.95 15 91.74 46.92 6.44 0.14 1289 15.29 10 25.29 0.02 R10 9.44 0.95 15 134.52 46.92 9.44 0.20 4649 22.42 10 32.42 0.01 R11 9.285 0.95 15 132.31 46.92 9.29 0.20 3074 22.05 10 32.05 0.01 R12 9.041 0.95 15 128.83 46.92 9.04 0.19 3048 21.47 10 31.47 0.01 R13 9.31 0.95 15 132.67 46.92 9.31 0.20 2315 22.11 10 32.11 0.01 R14 8.69 0.95 15 123.83 46.92 8.69 0.19 2315 20.64 10 30.64 0.01 BOLT TENSION BOLT SHEAR BOLT BENDING

Test

Tbn Tuplift Tuplift/Tbn Tn Fact Fact/Tn Mbu Mbn Mbu/Mbn Name kip kip

  • kip

kip

  • kip-in

kip-in

  • R1

39.92 15.87 0.40 47.90 5.33 0.11

  • 2.49

R2 39.92 24.81 0.62 47.90 8.34 0.17 25.02 2.49 10.03 R3 39.92 15.37 0.38 47.90 4.39 0.09

  • 2.49
  • R4

39.92 16.56 0.41 47.90 5.57 0.12

  • 2.49
  • R5

39.92 18.47 0.46 47.90 8.69 0.18 26.07 2.49 10.45 R6 39.92 14.70 0.37 47.90 5.88 0.12

  • 2.49
  • R7

63.83 22.88 0.36 76.60 6.88 0.09

  • 5.98
  • R8

63.83 22.08 0.35 76.60 9.30 0.12 27.89 5.98 4.66 R9 63.83 15.29 0.24 76.60 6.44 0.08 19.31 5.98 3.23 R10 63.83 22.42 0.35 76.60 9.44 0.12 28.32 5.98 4.73 R11 63.83 22.05 0.35 76.60 9.29 0.12 27.86 5.98 4.65 R12 63.83 21.47 0.34 76.60 9.04 0.12 27.12 5.98 4.53 R13 63.83 22.11 0.35 76.60 9.31 0.12 9.31 5.98 1.56 R14 63.83 20.64 0.32 76.60 8.69 0.11 52.14 5.98 8.71

LIMIT STATES / ROOF POSTS

  • Base plate yielding a contributing

factor

  • Bolt bending predominant limit

state

  • Shims not loaded enough to

contribute

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SLIDE 16

LIMIT STATES / CANOPY BEAMS

  • Base plate yielding a

contributing factor for efficiently designed specimens

  • Bolt bending predominant limit

state (though much less so for beams)

  • Shims not loaded enough to

contribute

CANOPY BEAMS - MEASURED STRENGTH RESULTS BASE PLATE YIELDING SHIM COMPRESSION

Test

Pmax Rf h Mu Pn Pu Pu/Pn Pn PuB PuA PuB + PnA (PuB + PnA)/Pn Name kip

  • in

kip-in kip kip

  • kip

kip kip kip

  • C1

4.887 0.8 57 222.85 15.89 4.89 0.31 37.14 37.14

  • C2

5.807 0.8 51 236.93 15.89 5.81 0.37 2315 39.49 39.49 0.02 C4 4.539 0.8 57 206.98 15.89 4.54 0.29 34.50 34.50

  • C5

4.858 0.8 51 198.21 15.89 4.86 0.31 2315 33.03 33.03 0.01 C7 6.213 0.95 57 336.43 42.42 6.21 0.15 56.07 56.07

  • C8

7.04 0.95 51 341.09 42.42 7.04 0.17 2315 56.85 56.85 0.02 C9 6.752 0.95 51 327.13 42.42 6.75 0.16 1289 54.52 54.52 0.04 C10 7.236 0.95 51 350.58 42.42 7.24 0.17 4649 58.43 58.43 0.01 C11 6.962 0.95 51 337.31 42.42 6.96 0.16 3074 56.22 56.22 0.02 C12 7.176 0.95 51 347.68 42.42 7.18 0.17 3048 57.95 57.95 0.02 C13 7.032 0.95 51 340.70 42.42 7.03 0.17 2315 56.78 56.78 0.02 C15 6.804 0.95 51 329.65 42.42 6.80 0.16 2315 54.94 54.94 0.02 BOLT TENSION BOLT SHEAR BOLT BENDING

Test

Tbn Tuplift Tuplift/Tbn Tn Fact Fact/Tn Mbu Mbn Mbu/Mbn Name kip kip

  • kip

kip

  • kip-in

kip-in

  • C1

89.81 37.14 0.41 107.78 4.89 0.05

  • 8.42
  • C2

89.81 39.49 0.44 107.78 5.81 0.05 17.42 8.42 2.07 C4 89.81 34.50 0.38 107.78 4.54 0.04

  • 8.42
  • C5

89.81 33.03 0.37 107.78 4.86 0.05 14.57 8.42 1.73 C7 113.47 56.07 0.49 136.17 6.21 0.05

  • 14.18
  • C8

113.47 56.85 0.50 136.17 7.04 0.05 21.12 14.18 1.49 C9 113.47 54.52 0.48 136.17 6.75 0.05 20.26 14.18 1.43 C10 113.47 58.43 0.51 136.17 7.24 0.05 21.71 14.18 1.53 C11 113.47 56.22 0.50 136.17 6.96 0.05 20.89 14.18 1.47 C12 113.47 57.95 0.51 136.17 7.18 0.05 21.53 14.18 1.52 C13 113.47 56.78 0.50 136.17 7.03 0.05 7.03 14.18 0.50 C15 113.47 54.94 0.48 136.17 6.80 0.05 40.82 14.18 2.88

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SLIDE 17

Shelf Angles

THERMAL MODELING STRUCTURAL TESTING FEM VALIDATION DESIGN RECOMMENDATIONS

Roof Posts Canopy Beams Bolted Connections With FRP Fills Flatwise Comp. Creep of FRP Ancillary Bolts + Materials

Limit states to account for increased eccentricities on connection, shim compression, bolt bending. Limit states to account for increased eccentricities on connection, shim compression, bolt bending. Limit states to account for increased eccentricities on connection, shim compression, bolt bending. Reduction of 20% recommended for FRP fills >=1”(comparable to steel fill spec) New test standard developed; reduction of 60% recommended for FRP to account for creep. Development of creep factor underway. Tech Note in development for guidelines on specifying and designing with stainless steel bolts. 77-92% 1-30% 1-30% No detriment No detriment No detriment Up to 20% strength & 84% stiffness loss Creep happens

PROJECT-LEVEL RESULTS

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SLIDE 18

THANK YOU QUESTIONS?