Non-linear finite element analysis of face-shell bedded hollow concrete masonry subject to concentrated loads
LccTA 681 S28 1994
LcshConcrete masonry - Materials - Testing
Materials - Fatigue
Strains and stresses
Finite element method
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AbstractFailure of face-shell bedded hollow masonry is completely different from that of solid masonry. Despite that fact, most codes of practice use the same design rules for both types of masonry. In order to develop new design rules for hollow masonry, numerical analyses based on a suitable model can be used to avoid an expensive and time consuming experimental programme. In this study, a non-linear finite element model is developed for face-shell bedded hollow masonry. Geometric and material non-linearities as well as progressive cracking are considered in the model. The behaviour of face-shell bedded hollow masonry is discussed in detail together with the merits and shortcomings of previous numerical models available for this kind of masonry. The current code provisions available for design against concentrated loads acting on hollow masonry are also introduced. The derivation of the proposed non-linear elasto-plastic finite element model is introduced. The material responses of both concrete blocks and mortar joints are modelled by the theory of plasticity using forms of yield surfaces written in terms of the stress invariants. Associated flow and isotropic hardening are used to define the plastic strain and the expansion of these surfaces. Cracking is modelled in two ways: the discrete cracking approach using interface elements to model web cracking and the smeared cracking approach to model in-plane face-shell/mortar joint cracking. The model behaviour is verified by comparing results to known experimental behaviour. First, numerical results are verified against the experimental behaviour of 3-block high hollow prisms. Then, results from simulated tests of seven-course high wallettes subject to concentrated loads are used for further verification. In the latter case, the substructuring technique is introduced to reduce the computational requirements of the finite element analyses. The behaviour and failure of hollow masonry are also discussed in detail from the first application of the load to final failure. The model is then used to analyze larger size walls which are subject to concentrated loads: the effects ofloading plate size and wall dimensions on the behaviour of the wall are discussed.
Bibliography: p. 311-318.