Towards Rational Design Method for Strengthening of Concrete Structures by External Bonding
Abstract: Many infrastructures
need to be repaired or strengthened due to various reasons, such as unexpected
deterioration and changes in performance requirement. This paper presents the
following recent achievements by the authors’ group on design method for
flexural strengthening of concrete structures by external bonding; (i) fracture
characteristics of interface between substrate concrete and cementitious
overlay, (ii) crack spacing of flexural strengthened beams, which affects
debonding strength, (iii) strengths of intermediate crack (IC) debonding and
end peeling, (iv) strength of concrete cover separation, and (v) effectiveness
of strengthening by external bonding. A unified approach for flexural
strengthening by steel plate, fiber reinforced polymer lami¬nate and
cementitious overlay, for both intermediate crack (IC) debonding, including end
peeling, and concrete cover separation is pre¬sented with consideration of
crack spacing in the streng¬thened members. Appropriate interfacial
rough¬¬¬ness to achieve efficient interface bond property is clari¬fied and the
concept of effectiveness of strengthen¬ing is proposed for better strengthening
design.
Keywords: Strengthening,
concrete structure, external bonding, overlay, steel plate, FRP
laminate, IC debonding, concrete cover separation
laminate, IC debonding, concrete cover separation
Author: Ueda, T., Zhang, D.,
Furuuchi, H.
Journal Code: jptsipilgg120039
