论文信息 - Size effect in concrete beams

Size effect in concrete beams

Abstract This paper will report on an experimental investigation into the size effect in the strength of hardened cement paste (nominal compressive strength 40 MPa) and high strength concrete (nominal compressive strength 110 MPa) as measured in three point bending. The aim of the investigation is to judge the range of applicability of the various size effect formulae available in the literature. With this aim in mind, the failure loads have been analysed according to the size effect formulae of Bazant and of Karihaloo for the notched beams and according to those of Bazant and of Carpinteri for the unnotched beams. The results of this analysis will be presented. Improvements to Karihaloo’s size effect formula will also be proposed.

Bhushan Lal Karihaloo | Q. Z. Xiao | H. M. Abdalla | B. Karihaloo | Q. Xiao

[1] Bhushan Lal Karihaloo,et al. Higher order terms of the crack tip asymptotic field for a wedge-splitting specimen , 2001 .

[2] F. H. Wittmann,et al. Boundary effect on concrete fracture induced by non-constant fracture energy distribution , 2001 .

[3] B. Karihaloo. Fracture mechanics and structural concrete , 1995 .

[4] Alberto Carpinteri,et al. Size effects on tensile fracture properties: a unified explanation based on disorder and fractality of concrete microstructure , 1994 .

[5] Bhushan Lal Karihaloo,et al. Approximate Green's functions for singular and higher order terms of an edge crack in a finite plate , 2002 .

[6] Z. Bažant. FRACTURE MECHANICS OF CONCRETE STRUCTURES , 1992 .

[7] Z. Bažant,et al. Scaling of quasibrittle fracture: asymptotic analysis , 1997 .

[8] Z. Bažant. Size Effect in Blunt Fracture: Concrete, Rock, Metal , 1984 .

[9] Bhushan Lal Karihaloo,et al. Higher order terms of the crack tip asymptotic field for a notched three-point bend beam , 2001 .

[10] Bhushan Lal Karihaloo,et al. Size effect in shallow and deep notched quasi-brittle structures , 1999 .

[11] Alberto Carpinteri,et al. Fractal nature of material microstructure and size effects on apparent mechanical properties , 1994 .

[12] B. Karihaloo,et al. Size effect in the strength of concrete structures , 2002 .

[13] A. Carpinteri. Scaling laws and renormalization groups for strength and toughness of disordered materials , 1994 .