a[mm]/l - Memorial University of Newfoundland DAI

ZC = penmeterof the column
The rhear penmeter for a rcczangle column a located at distance 1 25 d out from rhe
column. for a ctxular column tr located ! 25 d out from the column.
Manouk and Hursan (1991) tnvert~gaed the rtruelurxl behavnor of narmrl-
strength and hlgh-nrength concrete slabs wnrh respect la punching reraaance The result
,huwed that h~gh-strength cuncrra erh~btcs r more bnrtie fanlure than normal-nrengrn
concrete The rerearchen have also lndicvted that the Mae's Equnuon (2.41 cmnot he
mommended to predict the punchtng shew capilctty of hsgh-strength concrete sldhs The
punchlng renrtance 13 proponlonal ro rhc cuhlc mot of concrelc camprerrlve strength
Therefore. the assumpeon of the Bnr~rh coder e better than the use of rqusre mat of the
concrele strength as even an the present Nonh Amencan coder such as ACI-318 (1995)
md CSA A33.3-94 (1994).
Gardner and Shva (19961 eonnned the use of cuble mat of compresswe strength
uslng rhetr expenmental resulls regarding the punehlng rhear of a two-way flat relnfarced
concrele slab. An emplncal method urmg u shear penmeter amund rhe lodded area war
prerenrcd. The cmpnncal recommended equatlan was expressed as follows:
where. v. = ult!mate shear rtreor
v, = nommal rhear stress
V. = ulumate rhexfome
tr = penmelcr of loaded m a
d = effectwe depth of the slab