الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
The problem of punching shear in reinforced concrete curved members
jected to concentrated loads has received added emphasis due to its
iportance in construction of Arctic Offshore Structures. Arctic Offshore
tructures generally have a concrete wall that designed to resist the load
sulting from impact of ice. These walls are typically thick and heavily
inforced and sometimes prestressed to improve flexural and shear
pacity.
Results of an experimental investigation on the punching shear
trength of reinforced concrete curved members, representative of the
xterior walls of offshore structure, are presented. Thirteen specimens
were constructed and tested up to failure. Twelve of the specimens were
constructed as curved members (cylindrical segments) having variable ratio
between the radius and the slab thickness (R/h) , the other was cast as flat
plate and used for comparison. All models except the flat one were
restrained against horizontal displacement at the ends. They were tested
under an increasing concentrated load applied on the top surface at the
midpoint through different square plates. Three sizes of loading plates
were used namely 50 x 50 mm, 70 x 70 mm and 100 x 100 mm.
The punching shear strength was found to increase significantly with
the decrease of R/h ratio and with the increase of the size of loading
plate. A comparison is made between various code equations for predicting
the punching shear strength of reinforced concrete slabs and the obtained
results from this study. The examined code equations were found mostly to
be inadequate to predict the strength of curved members.