CAN FRACTURE MECHANICS PREDICT DAMAGE DUE DISASTER OF STRUCTURES?

Nagesh H.E, G. Appa Rao

Abstract: This paper discusses shortcomings of existing code provisions for design of reinforced concrete structures, and need for application of fracture mechanics in design of such structures. For a structure to perform satisfactorily in case of disastrous incidents, care must be exercised at the time of design of structure itself. Fracture mechanics approach for design of structures ensures rational design maintaining safety with reasonable safety margin. Currently, several national and international codes of practice do not recognize the size effect on strength and serviceability of structures. In the design of structures with concrete, the size effect needs to be incorporated to avoid sudden failures. Generally laboratory based tests have limitation on size of members, which are relatively very small compared to actual large structures whose strength cannot be extrapolated. The incorporation of effect of size and other fracture parameters can yield improvement in the design of members with better prediction of safety margin

Keywords: Fracture mechanics, Size effect, Minimum reinforcement, Ductility, Shear strength.

DOI: https://doi.org/10.15623/ijret.2014.0328016