A combined FRP and selective weakening retrofit for realistic pre-1970's RC structures
A combined FRP and selective weakening retrofit for realistic pre-1970's RC structures
复制标题
结合 FRP 和选择性弱化改造，实现 1970 年代之前的真实 RC 结构
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
H. Varum
中科院分区：
文献类型：
--
作者：
D. Pohoryles;T. Rossetto;J. Melo;H. Varum
现有钢筋混凝土（RC）的比例很大
A large proportion of existing reinforced concrete (RC)
buildings is vulnerable to brittle failure mechanisms
in earthquakes due to inadequate seismic detailing. Efficient and practical retrofit solutions are required to prevent future
losses.
To date, most experimental studies in the field of seismic retrofit with fibre
-
reinforced polymer (FRP) have
concentrated on simplified beam
-
column joint specimens. These often ignore the real practical
challenges incurr
ed by the
presence of a floor slab and transverse beams in retrofitting deficient specimens
. In this study, the results from four cyclic
tests on realistic full
-
scale
typical pre
-
1970’s
beam
-
column joints
with s
labs and transverse beams
are presented
.
Two
realistic retrofit scheme
s
using carbon
CFRP
sheets
are
proposed. The
first
scheme
aims
to improve the duc
tility of the
deficient joint
by
providing continuity of the
column
flexural strengthening through the joint.
The second scheme includes
selective weakening of the slab and aims
to
relocat
e
the
failure mechanism
to the beams
.
The
significance of the
presence
of the slab on the global beha
viour of the sub
-
assembly is confirmed by the experimental findings.
The res
ults highlight
that the proposed
combined
retrofit
and selective weakening scheme
can successfully increase the ductility of the joint by
activating
deformation in
the beams.