Numerical Modelling Of Bed-joint Reinforced Masonry Walls Subject To Out-of-plane Car-like Impacts

Summary

The behaviour of reinforced brick masonry walls subject to impact loading was studied.  Dynamic out-of-plane impact tests were performed on reinforced masonry walls under laboratory conditions. The tested walls were constructed to be representative of masonry bridge parapets and varied in length from 9 to 20 m.  The first walls tested were reinforced with 6 mm diameter stainless steel deformed bars placed in the bed-joints.  The loading impulse was designed to approximately simulate that applied by a car accidentally  impacting a wall at mid-length.  In parallel with the tests,  finite element modelling was carried out using LS-DYNA, a three-dimensional non-linear explicit finite element program.  A modelling approach suitable for bed-joint reinforced walls is described in detail.  As for the unreinforced walls modelled previously, a discrete approach was used, whereby individual masonry units were modelled separately using 8-noded brick elements.  The reinforcement was modelled using thin shell elements located in the bed-joints between masonry courses.  The models correctly predict that long (20 m) bed-joint reinforced walls are prone to bedding-plane sliding failures when subject to lateral impacts.  11 refs.

Primary author(s): Burnett S; Gilbert M; Beattie G; Molyneaux T C K; Hobbs B;

                            Sheffield,University; Liverpool,University;

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

            London,4-6 November 2002,p.51-56

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