PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama Univers

PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama Univers www.phwiki.com

PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama Univers

Kahn, Mike, Contributer has reference to this Academic Journal, PHwiki organized this Journal 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 REINFORCED CONCRETE COUPLED WALLS L Mw1 Mw2 C=T T mechanisms of shear resistance in rein as long as ced concrete coupling beams CD Mw1+Mw2+TL TL Coupling Degree Paulay in addition to Priestley 1991 wall beam wall PRECAST CONCRETE COUPLING BEAMS beam PT tendon connection region PT anchor angle wall region confinement concrete wall precast beam PT tendon beam PT duct confined concrete

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DEFORMED SHAPE AND COUPLING FORCES P P Vcoupling Vcoupling db z lb contact region gap opening reference line beam V coupling @ Pz l b OBJECTIVES Develop new system based on experimental in addition to analytical studies Develop seismic design/analysis guidelines in addition to tools, in addition to recommendations as long as application Steel Coupling Beams Experimental program Analytical model in addition to verification Precast Coupling Beams Advantages Parametric studies (DRAIN-2DX) Design approach OUTLINE

STEEL BEAM TESTS Objectives Investigate M-q behavior Verify analy. models Verify design tools in addition to procedures Eleven half-scale coupled wall subassemblages (angle, beam, post-tensioning properties) W10x68 PT str in addition to 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 region in addition to reaction fixture TEST SET-UP beam wall region loading block reaction block actuators

ANGLE FRACTURE Beam rotation = 9% Test 2 Test 5 Test 5 CYCLIC BEHAVIOR OF STEEL COUPLING BEAM applied shear as long as ce, kips (kN) beam chord rotation, % -10 0 10 0 60 -60 measured (267) (-267) ANALYTICAL WALL MODEL (DRAIN-2DX)

beam chord rotation, % -10 0 10 0 60 -60 applied shear as long as ce, kips (kN) predicted measured (267) (-267) VERIFICATION OF MODEL POST-TENSIONED COUPLED WALLS Unbonded post-tensioning is a promising in addition to feasible method to couple concrete walls (up to 60-65 percent coupling) Large self-centering, considerable energy dissipation Large de as long as mations with little damage The analytical models in addition to design tools/procedures work well Shift focus towards precast beams PRECAST ADVANTAGES Simpler beam-to-wall joints Central location of PT str in addition to s Fire in addition to environmental protection Higher friction resistance against shear sliding Favorable tolerances as long as construction Cost-efficient

PARAMETRIC STUDY DRAIN-2DX (Half-Scale Subassemblages) Varied Parameters: beam depth amount of PT angle size gage length aspect ratio TEST SPECIMENS (Half-Scale) TEST SPECIMEN CROSS-SECTIONS (Half-Scale) 7” 7” 7” 7” 14” 14” 14” 18” L8x4x1/2 L8x4x1/2 L8x4x1/2 L8x4x5/8

DRAIN-2DX SPECIMEN BEHAVIOR applied shear as long as ce, kips (kN) applied shear as long as ce, kips (kN) applied shear as long as ce, kips (kN) applied shear as long as ce, kips (kN) -8.0 0 8.0 -80 0 80 D = 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, (%) FINITE ELEMENT MODEL (ABAQUS) DRAIN-2DX VERSUS ABAQUS beam shear, kips (kN) contact depth/depth beam rotation, % beam rotation, % 300 (1335) 0 7 0 7 DRAIN-2DX ABAQUS DRAIN-2DX ABAQUS 1

MINIMUM PRINCIPAL STRESSES MAXIMUM PRINCIPAL STRESSES BEAM DESIGN confined concrete PT duct transverse rein as long as cement longitudinal rein as long as cement thru ducts as long as angle connection

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BEAM DESIGN PT duct confined concrete longitudinal rein as long as cement transverse rein as long as cement beam side view beam end view BEAM TO WALL CONNECTION wire mesh PT str in addition to L8x4x1/2 thru bolt confined concrete grout CURRENT STATUS Finalizing design Laboratory set-up Begin testing this summer

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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