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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.

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Presentation on theme: "PRECAST CONCRETE COUPLED WALL SYSTEMS Brad Weldon Yahya C. (Gino) Kurama University of Notre Dame PCI Daniel P. Jenny Research Fellowship PCI Committee."— Presentation transcript:

1 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

2 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

3 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

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

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

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

7 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

8 TEST SET-UP beam wallregion loading block reactionblock actuators

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10 ANGLE FRACTURE Beam rotation = 9% Test 2 Test 5

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

12 ANALYTICAL WALL MODEL (DRAIN-2DX)

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

14 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

15 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

16 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

17 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

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

19 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, (%)

20 FINITE ELEMENT MODEL (ABAQUS)

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

22 MINIMUM PRINCIPAL STRESSES

23 MAXIMUM PRINCIPAL STRESSES

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

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

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

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

28 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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