INFLUENCE OF PRIOR IN-PLANE DAMAGE ON THE OUT-OF- PLANE RESPONSE OF NON-LOAD BEARING UNREINFORCED MASONRY WALLS UNDER SEISMIC LOAD Bogdan Šakić 1 , Aleksa Milijaš 1 , Marko Marinković 2 , Christoph Butenweg 3 , Sven Klinkel 1 1 Lehrstuhl für Baustatik und Baudynamik, RWTH Aachen University, Mies-Van-der-Rohe- Straße 1, 52074 Aachen, Germany. e -mail: sakic@lbb-rwth.aachen.de, milijas@lbb.rwth-aachen.de, klinkel@lbb.rwth-aachen.de 2 Department of Engineering Mechanics and Theory of Structures, Faculty of Civil Engineering, Uni- versity of Belgrade, Bulevar kralja Aleksandra 73, 11000 Belgrade, Serbia. e-mail: mmarinkovic@grf.bg.ac.rs 3 CWE – Center for Wind and Earthquake Engineering, RWTH Aachen University, Mies-van-der Ro- he-Straße 1, 52074 Aachen, Germany. e-mail: butenweg@lbb.rwth-aachen.de Abstract Reinforced concrete frames with masonry infill walls are popular form of construction all over the world as well in seismic regions. While severe earthquakes can cause high level of damage of both reinforced concrete and masonry infills, earthquakes of lower to medium intensity some- times can cause significant level of damage of masonry infill walls. Especially important is the level of damage of face loaded infill masonry walls (out-of-plane direction) as out-of-plane load cannot only bring high level of damage to the wall, it can also be life-threating for the people near the wall. The response in out-of-plane direction directly depends on the prior in- plane damage, as previous investigation shown that it decreases resistance capacity of the in- fills. Behaviour of infill masonry walls with and without prior in-plane load is investigated in the experimental campaign and the results are presented in this paper. These results are later compared with analytical approaches for the out-of-plane resistance from the literature. Con- clusions based on the experimental campaign on the influence of prior in-plane damage on the out-of-plane response of infill walls are compared with the conclusions from other authors who investigated the same problematic. Keywords: Earthquake Engineering, Unreinforced masonry walls, Out-of-plane load, In- plane damage, Out-of-plane failure. 808 COMPDYN 2021 8 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.) Streamed from Athens, Greece, 28 - 30 June 2021 Available online at www.eccomasproceedia.org Eccomas Proceedia COMPDYN (2021) 808-828 ISSN:2623-3347 © 2021 The Authors. Published by Eccomas Proceedia. Peer-review under responsibility of the organizing committee of COMPDYN 2021. doi:10.7712/120121.8527.18913