International Institute of Earthquake Engineering and Seismology Journal of Seismology and Earthquake Engineering 1735-1669 15 2 2013 07 01 Experimental Investigation of the Unreinforced Small Masonry Walls under Bidirectional Seismic Loading 121 129 240662 EN Mahmoud Reza Maheri Shiraz University Mohammad Amir Najafgholipour Shiraz University Journal Article 2014 09 29 During an earthquake, a wall is subjected to a three-dimensional acceleration field and undergoes simultaneous in-plane and out-of-plane loading. It is often noted that in the field of brittle material strength, presence of one type of loading on a structural element affects the strength of that element against another type of loading. Considerable number of numerical and experimental studies, carried out to-date to investigate the behaviour of masonry walls under seismic loading, have either considered the in-plane response or the out-of-plane response of the wall separately without due consideration for any possible interaction between the two responses. In this paper, the results of a series of tests with different levels of simultaneous in-plane shear and out-of-plane bending actions on small brick walls constructed with standard high strength mortar are presented. The tests results indicate noticeable interaction between the in-plane shear and out-of-plane bending strengths of brick walls. The interaction curve appears to follow a circular trend. https://www.jsee.ir/article_240662_999bb1cd66f7d288620338be32489ad1.pdf