1 Professor of Structural Masonry and Head of Department of Civil and Structural Engineering, UMIST, Manchester, M60 IQD, UK
2 PhD student, Department of Civil and Structural Engineering
UMIST, Manchester, M60 I QD, UK
Lecturer, Mazandaran University, Iran
ABSTRACT
The viscoelastic behaviour of masonry has been studied using 18 instrumented short columns with cavity box sections of either concrete blockwork or clay brickwork. Measurements of the axial moisture movement, creep strain and prestress force for two years have provided the basis for a method of calculation of long-term strains in the masonry and change of post-tensioning force in the tendons. Comparisons of the experimental results with theoretical predictions such as those given by the Ross model have been made. A semi-empirical time-dependent relationship is proposed, which gives a suitable fit to measured prestress change and a good prediction for three environmental conditions.
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