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EFFECT OF LARGE OPENINGS IN UNBONDED POST-TENSIONED PRECAST CONCRETE WALLS

Investigating the impact of large openings on precast concrete walls using finite element modeling; includes parametric studies on opening size, location, and prestress level. Future work includes experimental verification and design recommendations.

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EFFECT OF LARGE OPENINGS IN UNBONDED POST-TENSIONED PRECAST CONCRETE WALLS

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  1. EFFECT OF LARGE OPENINGS IN UNBONDED POST-TENSIONED PRECAST CONCRETE WALLS Michael Allen Yahya C. Kurama University Of Notre Dame Notre Dame, IN

  2. ELEVATION anchorage wall panel unbonded PT bar horizontal joint spiral reinforcement foundation

  3. WALL WITH OPENINGS gravity load lateral load opening gap

  4. BASE PANEL compression stresses shear stresses

  5. CRACKING 5 2 1 3 4 3 1 2 5

  6. FINITE ELEMENT MODEL nonlinear plane stress elements truss elements contact elements

  7. ABAQUS VERSUS DRAIN base shear (kips) 1000 yielding state 500 gap opening state ABAQUS DRAIN 0 0.5 1 1.5 2 2.5 roof drift (%)

  8. ABAQUS VERSUS DRAIN contact length / wall length 1.0 ABAQUS DRAIN 0.5 0 0.5 1 1.5 2.5 2 roof drift (%)

  9. BUILDING LAYOUT FOR HIGH SEISMICITY 8 x 24 ft. = 192 ft. gravity load frame lateral load frame hollow- core panels wall N 110 ft. S inverted T-beam column L-beam

  10. WALL WH1CROSS SECTION C L PT bars ap=1.5 in2 (9.6 cm2) fpi=0.60fpu #3 spirals rsp=7% 12 in (31 cm) 10 ft (3 m) half wall length

  11. PARAMETRIC INVESTIGATION • opening size • opening location • prestress level

  12. OPENING SIZE lp=20 feet ho hp=16 feet lo lo 2 feet (0.10 lp) 4 feet (0.20 lp) 6 feet (0.30 lp) 8 feet (0.40 lp) 10 feet (0.50 lp) ho 2 feet (0.13 hp) 4 feet (0.25 hp) 6 feet (0.38 hp) 8 feet (0.50 hp)

  13. OPENING LOCATION lo ho = 6 feet y lo 2 feet (0.10 lp) 4 feet (0.20 lp) 6 feet (0.30 lp) 8 feet (0.40 lp) 10 feet (0.50 lp) y 10 feet (0.63 hp) 8 feet (0.50 hp) 6 feet (0.38 hp)

  14. PRESTRESS LEVEL C L high seismicity medium seismicity

  15. FUTURE WORK • model refinement • experimental verification • parametric investigation • strut-and-tie models • design recommendations

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