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SUMMARY:Punching Shear Resistance of Slab-Column Connections under Monoton
 ic and Reversed Cyclic Loading
DTSTART:20101018T121500
DTSTAMP:20260427T230607Z
UID:88535cfc65475d4104bbc041b11b0627becf40cd5bc8511475db5e95
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Gustavo J. Parra-Montesinos\, Univ. of Michigan\nFlat pl
 ates or flat slabs are commonly used in reinforced concrete framed constru
 ction. The achievement of a uniform floor bottom surface and greater clear
  story height compared to regular beam-column frames makes this type of co
 nstruction economical and architecturally appealing. The lack of beams\, h
 owever\, requires that special attention be paid to preventing punching sh
 ear failures in the connections between the slab and the supporting column
 s. For several decades the use of drop panels or capitals was the preferre
 d option to increase the punching shear strength of slab-column connection
 s. In the past few years\, however\, solutions that do not require a chang
 e in the slab thickness have become popular\, such as the use of shear rei
 nforcement in the form of headed studs.\nResults from experimental researc
 h aimed at evaluating the effectiveness of two types of shear reinforcemen
 t in slab-column connections\, headed studs and hooked steel fibers\, will
  be presented. (...)\nTest results indicate that hooked steel fibers are e
 ffective as punching shear reinforcement in slab-column connections. Under
  monotonically increased load\, the use of fiber reinforcement in the conn
 ection region led to a substantial increase in shear strength with the pot
 ential of changing the slab failure mode from brittle shear failure to duc
 tile flexural failure. Contrary to observations made by other researchers\
 , the use of shear stud reinforcement did not lead to an increase in conne
 ction shear strength compared to slabs without shear reinforcement. After 
 punching\, however\, the slabs with headed studs exhibited a relatively gr
 adual strength decay compared to a nearly total loss of strength in the sl
 abs without shear reinforcement.\nUnder a gravity shear ratio of ½ and bi
 -axial lateral displacement reversals\, the use of fiber reinforcement all
 owed the slab to exhibit substantial flexural yielding prior to failing in
  punching shear\, which occurred at drifts on the order of 3%. On the othe
 r hand\, the slab-column connection with shear stud reinforcement failed i
 n punching shear at a drift of approximately 1.6%. This failure was charac
 terized by a breakout failure of the concrete engaged by the second line o
 f studs\, accompanied by severe bending of the rail supporting the studs.
LOCATION:GC F1 11
STATUS:CONFIRMED
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