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

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REINFORCED CONCRETE COUPLED WALLS L M w1 M w2 C=T T mechanisms of shear resistance in reinforced concrete coupling beams CD M w1 +M w2 +TL TL Coupling Degree Paulay and Priestley 1991 wall beam wall

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beam PT tendon connection region PT anchor angle wall region confinement concrete wall precast beam PT tendon beam PRECAST CONCRETE COUPLING BEAMS PT duct confined concrete

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DEFORMED SHAPE AND COUPLING FORCES P P V coupling dbdb z lblb contact region gap opening reference line beam V coupling Pz l b

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OBJECTIVES Develop new system based on experimental and analytical studies Develop seismic design/analysis guidelines and tools, and recommendations for application

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Steel Coupling Beams Experimental program Analytical model and verification Precast Coupling Beams Advantages Parametric studies (DRAIN-2DX) Design approach OUTLINE

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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) W10x68 PT strand L4x8x5/8 a p =140 mm 2 (0.217 in 2 ) l w =1.5 m l b =1.5 m (5 ft) l w =1.5 m strong floor f pi =0.6f pu Elevation View (half-scale) load block test wall region and reaction fixture

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TEST SET-UP beam wallregion loading block reactionblock actuators

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ANGLE FRACTURE Beam rotation = 9% Test 2 Test 5

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CYCLIC BEHAVIOR OF STEEL COUPLING BEAM applied shear force, kips (kN) beam chord rotation, % measured (267) (-267)

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ANALYTICAL WALL MODEL (DRAIN-2DX)

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beam chord rotation, % applied shear force, kips (kN) predicted measured (267) (-267) VERIFICATION OF MODEL

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POST-TENSIONED COUPLED WALLS Unbonded post-tensioning is a promising and feasible method to couple concrete walls (up to 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

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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

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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 14L8x4x1/ L8x4x1/ L8x4x1/ L8x4x1/ L8x4x5/ L8x4x5/ L8x4x1/ L8x4x1/ L8x4x1/ L8x4x1/ L8x4x5/ L8x4x5/8452.5

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TEST SPECIMENS (Half-Scale) Beam Depth (in) Angle PT Strands Gage Length (in) Aspect Ratio Parameter 14L8x4x1/ Baseline Test 14L8x4x1/ apap 14L8x4x5/ Angle 18L8x4x1/ Depth, aspect ratio

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TEST SPECIMEN CROSS-SECTIONS (Half-Scale) 7” 14” 18” L8x4x1/2 L8x4x5/8

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DRAIN-2DX SPECIMEN BEHAVIOR applied shear force, kips (kN) applied shear force, kips (kN) applied shear force, kips (kN) applied shear force, kips (kN) D = 18” L8x4x5/8 PT = 4 (356) (-356) (267) (-267) (267) (-267) D = 14” L8x4x1/2 PT = 3 D = 14” L8x4x5/8 PT = 4 D = 14” L8x4x1/2 PT = (356) (-356) beam chord rotation, (%) beam chord rotation, (%) beam chord rotation, (%) beam chord rotation, (%)

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FINITE ELEMENT MODEL (ABAQUS)

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DRAIN-2DX VERSUS ABAQUS beam shear, kips (kN) contact depth/depth beam rotation, % 300 (1335) 0707 DRAIN-2DX ABAQUS DRAIN-2DX ABAQUS 1

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MINIMUM PRINCIPAL STRESSES

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MAXIMUM PRINCIPAL STRESSES

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BEAM DESIGN confined concrete PT duct transverse reinforcement longitudinal reinforcement thru ducts for angle connection

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BEAM DESIGN PT duct confined concrete longitudinal reinforcement transverse reinforcement beam side viewbeam end view

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BEAM TO WALL CONNECTION wire mesh PT strand L8x4x1/2 thru bolt confined concrete grout

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CURRENT STATUS Finalizing design Laboratory set-up Begin testing this summer

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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

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