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Mechanical modelling of quasi-brittle shear failure

Hoiseth K. V.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, no 1

221-243

The present paper deals with masonry subjected to combined compression and shear. The purpose of the study was to demonstrate the capability of numerical simulations to reproduce the essential mechanical behaviour, as observed by experiments. A coarse 3-dimensional element mesh was used to study the mechanical behaviour of the Fixed Smeared Crack model, in combination with various shear retention descriptions, and the Rotating Smeared Crack model. The obtained shear-stress/deformation relationships, before onset of cracking, showed that the applied elastic stiffness was somewhat too low, when compared to the average of the test results. This was not due to the geometric modelling, as a coarse mesh should yield a too stiff behaviour. The reason was likely that Young's modulus was taken from uniaxial tests with specimens of another batch than the ones used in the combined compression and shear experiments. With the Rotating Smeared Crack model, a limit load and subsequent global softening was obtained. In the first instance, this was due to rotation of the crack directions, such that increasing shear stress produced crack-planes in the joint element which approached the horizontal orientation, i.e. parallel to the interface between units and joint. Subsequently, the softening behaviour was achieved by a realistic description for compressive states of stress.