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In order to assist with the assessment of reinforced concrete structures with defects, 54 shear tests were performed on beams containing zones of honeycombed concrete. The main variables investigated were the location of the honeycombed zone in the shear span and the strengths of the honeycombed concrete and the parent normal concrete. It was found that a zone of honeycombed concrete anywhere in the shear span could affect shear strength either directly or indirectly by modifying the crack formation.
W. Omar, Universiti Teknologi, Malaysia
L. A. Clark, BEng, PhD, FREng, FIStructE, FICE The University of Birmingham
During the earthquake of 7 September 1999 in Athens, many reinforced concrete (RC) structures (particularly those with an asymmetric in-plan skeleton and a ‘soft ’ ground-floor storey) suffered localised damage that cannot be attributed to defective work. Typical of such damage is the localised failure suffered by vertical structural members at the location of the point of inflection usually situated within their mid-height region.
This type of failure, although compatible with the truss analogy, is not predicted by the methods adopted by the codes of practice through which the truss model is applied in structural-concrete design. As a result, the likelihood of the occurrence of this type of failure is expected to increase with the denser link spacing specified by the earthquake-resistant design clauses of new codes of practice for the critical lengths of linear structural concrete members. This article describes an attempt to identify the causes for this deviation of the real behaviour of structural-concrete members from the code predictions.
Prof. M. D. Kotsovos, Dip Ing, DIC, PhD, DSc
Director Laboratory of Concrete Structures, Department of Civil Engineering, National Technical University of Athens
Prof. M. N. Pavlovic, BEng, MEngSc, PhD, ScD, FIStructE, FICE
Head Concrete Structures, Section,Department of Civil Engineering, Imperial College of Science, Technology and Medicine