B.M. NG’ANDU, A.T. VERMELTFOORT and D.R.W. MARTENSEindhoven University of Technology

Bi-axial stress situations arise in shear walls subjected to in-plane loads. Modelling of masonry therefore requires material data on stress-deformation behaviour that takes into account combinations of direct stresses and shear stresses. In order to acquire material data, a test rig previously used for three-dimensional testing of concrete was adapted to allow for 2D testing. Masonry prisms with varying bed joint orientation were tested. Compressive test experience from a previous research programme on the effect of the width of the specimen on compressive strength was also used. From 2D-test results it was concluded that some rotation of the loading platens, especially in specimens with inclined bed joints, occurred. Deformation differences indicated load-eccentricities both in specimens loaded in one and two directions. This study aims at establishing the suitability of the two-jack test rig in a project investigating the possibilities of using calcium silicate units as a structural infill in frames.