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The Structural Engineer

The behaviour of brick masonry shear walls has been investigated over many years. Their strength is usually defined in terms of the average shear and normal stresses on the bed joints, regardless of the testing techniques adopted. This paper presents an analytical approach predicting the failure of shear walls using a biaxial stress failure criterion developed from tests on brickwork panels. A computer model is used, which reproduces the non-linear behaviour of masonry produced by progressive cracking. The theoretical results are compared with experimental tests performed on shear wall panels subjected to combined compression and racking load. The influence of test method on the ‘masonry’ shear strength is discussed. W. Samarasinghe, A.W. Page and Professor A.W. Hendry

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The Structural Engineer

The paper is concerned with the analysis of the behaviour of screwed fastenings subjected to repeated loading that can lead to fatigue. Earlier experiments have shown that, in the process of repeated loading, considerable discrepancies in the behaviour of identical fastenings can be observed which cannot always be accounted for in terms of loading data alone. It is postulated that these discrepancies are due to the different character of the development of plastic deformations in the process of loading which determines whether the failure observed is caused by -high-cyclic fatigue -low-cyclic fatigue -an increase of plastic deformations This relation also has significant consequences for the experimental establishment of the design strength of a fastening, because it determines whether the approach ‘from above’ (reduction of the ultimate strength) or ‘from below’ (limitation of the plastic allowable deformation) should be chosen. The theoretical interpretation is verified by the author’s experiments. M. Strnad

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