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| پرونده دریافت: Behavior of Reinforced Concrete Members Prone to Shear Deformations Part I - |
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 پرونده دریافت: Behavior of Reinforced Concrete Members Prone to Shear Deformations Part I -
ACI STRUCTURAL JOURNAL: Behavior of Reinforced Concrete Members Prone to Shear Deformations Part I - Effect of Confinement
ACI STRUCTURAL JOURNAL
TECHNICAL PAPER
Behavior of Reinforced Concrete Members Prone to Shear
Deformations: Part I—Effect of Confinement
by Suraphong Powanusorn and Joseph M. Bracci
Confinement due to transverse reinforcement is acknowledged to
have a positive influence on enhancing the overall performance of
reinforced concrete (RC) members in terms of strength and
deformability. Significant research in the literature has concentrated
on the effect of confinement in RC members subjected to flexural or
combined flexural/axial forces. Relatively little has been done to
evaluate the effects of confinement on shear-dominated RC members. A
new analytical model under the context of the Modified Compression
Field Theory (MCFT) is developed to incorporate the beneficial
effect of confinement due to transverse reinforcement. Results from
the analytical investigation show good correlation with available
experimental results on RC bent caps, where shear deformations
were considered the dominant action. In addition, the confinement
provided by the out-of-plane horizontal legs of the transverse reinforcement
has a significant effect on the strength and deformability
on shear-dominated RC members.
Keywords: bent caps; confined concrete; shear deformations.
INTRODUCTION
Concrete strength, either in uniaxial or multiaxial loading,
is strongly dependent on the hydrostatic pressure. Generally,
the compressive strength and deformability of concrete
increases as the applied hydrostatic pressure increases. In
seismically active zones, use of seismic hoop reinforcement
in structural joint regions, columns, and beams is required in
modern building codes (ACI Committee 318 2005). The
primary purpose of the seismic hoop reinforcement is to
confine the core concrete and thereby create increased
hydrostatic pressures that allow for significant energy
dissipation by longitudinal reinforcement yielding.
Numerous research studies have focused on the use of
passive and active measures to provide confinement to
reinforced concrete (RC) members for enhancing their axial
and flexural performance, either for rehabilitation or retrofit
of existing structures (Mander et al. 1988). Relatively little
has been done to evaluate the effect of confinement on RC
members prone to shear deformations.
An experimental program was conducted at Texas A&M
University to evaluate the effect of reinforcement details on
the structural performance of RC bent caps where shear was
considered to be the dominant action in the load transfer
mechanism (Bracci et al. 2000; Young et al. 2002). Figure 1
shows the general test setup and existing reinforcement details
for the specimen RC bent caps. The failure mechanism
observed with typical bent cap reinforcement details was
predominantly due to shear failure, although the main
longitudinal reinforcement (top steel) was loaded slightly
beyond the yield limit at failure. When the amount of shear
stirrup reinforcement was increased (using overlapping stirrups,
as shown in Fig. 2), however, the failure load and deformability
of the RC bent cap increased, given the same longitudinal
reinforcement. Because overlapping stirrups have twice the
reinforcement area as a single stirrup, it can be argued that
the increased specimen strength and ductility is attributed to
the stirrups themselves. The data from strain gauges installed
on the stirrups, however, indicate that the stirrups themselves
did not significantly contribute to the strength of RC bent and reinforcement is implicitly taken into account by
tension-stiffening...
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ورژن:
اندازه فايل: 830.08 کیلو بایت
تاریخ ارسال: پنجشنبه، 23 آذر، 1385
دریافت فایل: 90
آدرس اینترنتی: http://censoft.net/Detail.asp?cenID=574
توضیحات:
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