Strain And Curvature Diagrams Of Eccentrically Loaded Masonry Specimens

Summary

Deformation in masonry due to eccentric compression was studied, looking at the effects of joint imperfections due to "rounding of the bed joint".  Often only the central area  of a masonry unit is bonded and openings develop at the edges.  Previous studies have shown that this causes a non-uniform strain distribution in concentrically loaded specimens.  Masonry specimens 25 mm wide were cut from couplets.  Wire cut and soft mud bricks were used.  The specimens made from soft mud bricks were cracked during preparation. Nevertheless, they were used to study the closing effect of cracks. Specimens were cyclically loaded with eccentricities of -32, -16, 0, 16 and 32 mm.  A moving seating arrangement was used to allow for free horizontal movement of the loaded bottom surface of the specimen.  After some initial settlement, the load eccentricity remained constant.  Deformations observed through laser interferometry confirmed the uneven strain distribution.  The bending stiffness was affected by the variation in mortar properties. Moment/curvature diagrams showed a shift when changing from positive to negative rotation.  5 refs.

Primary author(s): Vermeltfoort A T

                            Eindhoven,Technical University

Source: Masonry (9). Proc.6th Int.Masonry Conf.

            London,4-6 November 2002,p.523-530

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