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PRECAST CONCRETE COUPLED WALL PRECAST CONCRETE COUPLED WALL SYSTEMS SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee Days April 24, 2004

PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

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Page 1: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

PRECAST CONCRETE COUPLED PRECAST CONCRETE COUPLED WALL SYSTEMSWALL SYSTEMS

Brad Weldon

Yahya C. (Gino) Kurama

University of Notre Dame

PCI Daniel P. Jenny Research Fellowship

PCI Committee Days

April 24, 2004

Page 2: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

REINFORCED CONCRETE COUPLED WALLS

LMw1 Mw2

C=TT

mechanisms of shear resistance in reinforced concrete coupling beams

CD Mw1+Mw2+TL

TL

Coupling Degree

Paulay and Priestley 1991 wall beam wall

Page 3: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

beam

PT tendon

connectionregion

PTanchor

angle wall region

confinementconcrete wall

precast beam

PT tendon

beam

PRECAST CONCRETE COUPLING BEAMS

PT duct

confined concrete

Page 4: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

DEFORMED SHAPE AND COUPLING FORCES

PP

Vcoupling

Vcoupling

dbz

lb

contactregion

gapopening

reference line

beam

Vcoupling Pz

lb

Page 5: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

OBJECTIVES

• Develop new system based on experimental and analytical studies

• Develop seismic design/analysis guidelines and tools, and recommendations for application

Page 6: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

• Steel Coupling Beams Experimental program Analytical model and verification

• Precast Coupling Beams Advantages Parametric studies (DRAIN-2DX) Design approach

OUTLINE

Page 7: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

STEEL BEAM TESTS

Objectives• Investigate

M- behavior• Verify analy. models• Verify design tools

and procedures

• Eleven half-scale coupled wall subassemblages (angle, beam, post-tensioning properties)

W10x68PT strand

L4x8x5/8

ap=140 mm2

(0.217 in2)

lw=1.5 m lb=1.5 m (5 ft) lw=1.5 m

strong floor

fpi=0.6fpu

Elevation View (half-scale)

load block

test wall regionand reaction fixture

Page 8: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

TEST SET-UP

beambeamwallwallregionregion

loading blockloading block

reaction reaction blockblock

actuatorsactuators

Page 9: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee
Page 10: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

ANGLE FRACTURE

Beam rotation = 9%Beam rotation = 9%

Test 2Test 2

Test 5Test 5

Test 5Test 5

Page 11: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

CYCLIC BEHAVIOR OF STEEL COUPLING BEAM applied shear force, kips (kN)

beam chord rotation, %-10 0 10

0

60

-60

measured(267)

(-267)

Page 12: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

ANALYTICAL WALL MODEL (DRAIN-2DX)

Page 13: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

beam chord rotation, %-10 0 10

0

60

-60

applied shear force, kips (kN)

predicted measured(267)

(-267)

VERIFICATION OF MODEL

Page 14: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

POST-TENSIONED COUPLED WALLS

• Unbonded post-tensioning is a promising and feasible method to couple concrete walls (up to 60-65 percent coupling)

• Large self-centering, considerable energy dissipation• Large deformations with little damage• The analytical models and design tools/procedures

work well• Shift focus towards precast beams

Page 15: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

PRECAST ADVANTAGES

• Simpler beam-to-wall joints• Central location of PT strands• Fire and environmental protection• Higher friction resistance against shear sliding• Favorable tolerances for construction • Cost-efficient

Page 16: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

PARAMETRIC STUDY DRAIN-2DX(Half-Scale Subassemblages)

Varied Parameters:

• beam depth

• amount of PT

• angle size

• gage length

• aspect ratio

Beam Depth (in)

Angle PT Strands

Gage Length (in)

Aspect Ratio

14 L8x4x1/2 3 3 3.21

14 L8x4x1/2 3 5 3.21

14 L8x4x1/2 4 3 3.21

14 L8x4x1/2 4 5 3.21

14 L8x4x5/8 3 3 3.21

14 L8x4x5/8 4 5 3.21

18 L8x4x1/2 3 3 2.5

18 L8x4x1/2 3 5 2.5

18 L8x4x1/2 4 3 2.5

18 L8x4x1/2 4 5 2.5

18 L8x4x5/8 3 3 2.5

18 L8x4x5/8 4 5 2.5

Page 17: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

TEST SPECIMENS(Half-Scale)

Beam Depth (in)

AnglePT

Strands

Gage Length

(in)

Aspect Ratio

Parameter

14 L8x4x1/2 3 5 3.21Baseline

Test

14 L8x4x1/2 4 5 3.21 ap

14 L8x4x5/8 4 5 3.21 Angle

18 L8x4x1/2 4 5 2.5Depth,

aspect ratio

Page 18: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

TEST SPECIMEN CROSS-SECTIONS(Half-Scale)

7”

7”

7”

7”

14”

14”

14”

18”

L8x4x1/2

L8x4x1/2

L8x4x1/2

L8x4x5/8

Page 19: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

DRAIN-2DX SPECIMEN BEHAVIOR a

pp

lied

sh

ear

forc

e,

kip

s (

kN

)

ap

pli

ed s

hea

r fo

rce,

ki

ps

(k

N)

app

lied

sh

ear

forc

e,

kip

s (

kN

)

app

lied

sh

ear

forc

e,

kip

s (

kN

)

-8.0 0 8.0 -80

0

80D = 18” L8x4x5/8 PT = 4

(356)

(-356)

-60

60(267)

(-267) -60

60(267)

(-267)

D = 14” L8x4x1/2 PT = 3

D = 14” L8x4x5/8 PT = 4

D = 14” L8x4x1/2 PT = 4

-80

80(356)

(-356)

beam chord rotation, (%)

-8.0 0 8.0 beam chord rotation, (%)

-8.0 0 8.0 beam chord rotation, (%)

-8.0 0 8.0 beam chord rotation, (%)

Page 20: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

FINITE ELEMENT MODEL (ABAQUS)

Page 21: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

DRAIN-2DX VERSUS ABAQUS

beam shear, kips (kN) contact depth/depth

beam rotation, % beam rotation, %

300(1335)

0 7 0 7

DRAIN-2DXABAQUS

DRAIN-2DXABAQUS

1

Page 22: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

MINIMUM PRINCIPAL STRESSES

Page 23: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

MAXIMUM PRINCIPAL STRESSES

Page 24: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

BEAM DESIGN

confined concrete

PT duct

transverse reinforcement

longitudinal reinforcement

thru ducts for angle connection

Page 25: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

BEAM DESIGN

PT duct

confined concrete

longitudinal reinforcement

transverse reinforcement

beam side viewbeam end view

Page 26: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

BEAM TO WALL CONNECTION

wire mesh

PT strand

L8x4x1/2

thru bolt

confined concrete

grout

Page 27: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

CURRENT STATUS

• Finalizing design• Laboratory set-up• Begin testing this summer

Page 28: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee

ACKNOWLEDGMENTS

• Precast/Prestressed Concrete Institute• University of Notre Dame

Industry Participants• Cary Kopczynski & Company• StresCore Inc.• Dywidag Systems International, U.S.A, Inc.• Insteel Wire Products• Dayton/Richmond Concrete Accessories

Page 29: PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee