Towards Rational Design Method for Strengthening of Concrete Structures by External Bonding
Keywords:Strengthening, concrete structure, external bonding, overlay, steel plate, FRP laminate, IC debonding, concrete cover separation.
AbstractMany 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.
Zhang, D., Ueda, T. and Furuuchi, H., Fracture Mechanisms of Polymer Cement Mortar (PCM)- Concrete Interfaces, Journal of Engineering Mechanics, ASCE (to be printed).
Zhang, D., Ueda, T. and Furuuchi, H., Average Crack Spacing of Overlay-Strengthened RC Beams, Journal of Materials in Civil Engineering, ASCE, 23(10), October 2011, pp. 1460-1472, DOI: 10.1061/(ASCE)MT.1943-5533.0000316. [CrossRef]
Zhang, D., Ueda, T. and Furuuchi, H., Intermediate Crack Debonding of Polymer Cement Mortar Overlay-Strengthened RC Beam, Journal of Materials in Civil Engineering, ASCE, 23(6), June 2011, pp. 857-865, DOI: 10.1061/(ASCE)MT.1943-5533.0000240. [CrossRef]
Zhang, D., Ueda, T. and Furuuchi, H., Concrete Cover Separation Failure of Overlay-strengthened Reinforced Concrete Beams, Construction and Building Materials, 26(1), 2012, pp. 735-745, DOI: 10.1016/j.conbuildmat.2011.06.082. [CrossRef]
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