Derakhshan, H.Lumantarna, R.Dizhur, D.Ingham, J.M.2014-12-102014-12-102010Proceedings of the 8th International Masonry Conference, 2010, pp.1-10http://hdl.handle.net/2440/87995A field testing programme was developed to investigate the out-of-plane behaviour of as-built unreinforced masonry (URM) walls of four different buildings. The buildings were between approximately 80 to 130 years old, and had different masonry materials and construction forms. The objective of the testing programme was to compare the as-built wall behaviour with that studied using laboratory-based samples and to provide data with which to evaluate current seismic assessment guidelines. In total, 10 tests were performed on seven URM walls, with the out-of-plane force being uniformly applied to the wall surface. Several tests were repeated with original and modified support conditions, and the results from different tests were analysed to identify the effect of different wall boundary conditions. In particular, the effects of a concrete ring beam used at the floor levels of a URM building and the effects of wall anchorage to the building diaphragms by means of grouted steel rods were investigated. A behavioural model previously obtained through laboratory testing was proven to be effective for prediction of the cracked wall behaviour. Out-of-plane wall resistance was compared to the appropriate seismic demand of each site, and the results of the comparison were used to evaluate the NZSEE 2006 out-of-plane wall seismic evaluation method. The study showed that the evaluation method was conservative in most cases, but overestimated the wall strength in areas with high seismicity. Based on the test observations it was concluded that a dual strengthstability based criteria has the greatest potential to provide economical wall assessment results compared to current stability based criteria. Two of the tests were performed on two-way spanning walls, and the results showed that the two-way action significantly increased the wall resistance.enCopyright status unknownUnreinforced masonry; out-of-plane; in-situ testing; one-way; two-way; seismic assessment; wallConference paper0030016814144176Derakhshan, H. [0000-0003-1859-4700]