%0 Generic
%A Pohoryles, DA
%A Rossetto, T
%A Melo, J
%A Varum, H
%D 2017
%F discovery:1540115
%T A combined FRP and selective weakening retrofit for realistic pre-1970's RC structures
%U https://discovery.ucl.ac.uk/id/eprint/1540115/
%X 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.
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