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A calculation procedure is described for estimating crack shear stresses and crack slip displacements from average strain measurements made on reinforced concrete panels. Several series of panels, previously tested, are examined and crack shear-slip data are extracted. These data are compared against the predictions of previously developed crack slip models, as well as against an alternative constitutive model proposed herein. Reasonable correlation is found between experimental and calculated values, particularly at near-ultimate load conditions. It is then shown that including crack shear slip behaviour in a computational model results in improved accuracy in terms of predicted load-deformation response and ultimate load capacity for reinforced concrete elements such as panels, beams and shear walls. Further, it is shown that rigorously accounting for crack slip displacements results in a better representation of various subtle aspects of behaviour, such as the failure mode and the capacity of elements to deform and redistribute load.

This article explores the growing phenomenon of public video surveillance and how the law should protect an individual's right to privacy while providing for effective law enforcement. The author considers the positive and negative effects of surveillance and recent technological advancements that currently challenge courts, legislatures, and police forces. Canadian case studies from Kelowna and Edmonton are utilized to examine the role of federal and provincial privacy legislation, while the Supreme Court of Canada's evolving interpretation of s. 8 of the Charter is canvassed through an examination of jurisprudence involving public surveillance technology. Ultimately, the author concludes that public video surveillance is necessary but the law must control its use. Video surveillance via automated collection would resolve the "effectiveness versus privacy" policy debate by minimizing the potential for abuse.

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