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

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Presentation transcript:

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

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

WALL WITH OPENINGS lateral load gravity load opening gap

BASE PANEL compression stresses shear stresses

CRACKING

FINITE ELEMENT MODEL truss elements contact elements nonlinear plane stress elements

ABAQUS VERSUS DRAIN base shear (kips) roof drift (%) DRAIN yielding state gap opening state ABAQUS

ABAQUS VERSUS DRAIN roof drift (%) contact length / wall length ABAQUS DRAIN

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

WALL WH1 CROSS SECTION 12 in (31 cm) 10 ft (3 m) half wall length #3 spirals  sp =7% PT bars a p =1.5 in 2 (9.6 cm 2 ) f pi =0.60f pu C L

PARAMETRIC INVESTIGATION opening size opening location prestress level

OPENING SIZE hoho 2 feet (0.13 h p ) 4 feet (0.25 h p ) 6 feet (0.38 h p ) 8 feet (0.50 h p ) lolo 2 feet (0.10 l p ) 4 feet (0.20 l p ) 8 feet (0.40 l p ) 6 feet (0.30 l p ) 10 feet (0.50 l p ) lolo hoho h p =16 feet l p =20 feet

OPENING LOCATION lolo y 10 feet (0.63 h p ) 8 feet (0.50 h p ) 6 feet (0.38 h p ) lolo 2 feet (0.10 l p ) 4 feet (0.20 l p ) 8 feet (0.40 l p ) 6 feet (0.30 l p ) 10 feet (0.50 l p ) y h o = 6 feet

PRESTRESS LEVEL C L high seismicity medium seismicity

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