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Low-velocity out-of-plane impact tests on double-wythe unreinforced brick masonry walls instrumented with optical measurements
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.ORCID iD: 0000-0002-9586-8667
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.ORCID iD: 0000-0002-3481-1368
RISE Research Institutes of Sweden, Safety and Transport, Fire and Safety.ORCID iD: 0000-0002-0033-1841
2023 (English)In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 178, article id 104597Article in journal (Refereed) Published
Abstract [en]

Unreinforced brick masonry makes up today a significant piece of the European built environment, including not only residential buildings but also strategically important structures that are not designed to withstand blasts and impacts. Yet, it is difficult to accurately estimate the response of these structures and the extent of damage they sustain during such extreme loading conditions. This paper presents the implementation and discusses the results of laboratory impact tests conducted on natural-scale double-wythe unreinforced brick masonry walls, a typology that is frequently found in Northern Europe. The walls were spanning vertically between two reinforced concrete slabs and were subjected to low-velocity drop-weight pendulum tests in which they were repeatedly hit until the opening of a breach in the centre of the wall. The tests were instrumented with both hard-wired and optical measurements, the latter consisting of high-speed cameras and digital image correlation techniques, to face the difficulty of observing cracks and determining the deflections of the walls with adequate accuracy at the time of the impact. Investigated in these tests were the out-of-plane response of the walls and their capacity to resist the impacts. The axial load applied on the top of the walls was varied for two wall configurations and monitored throughout the tests to study the effect of arching on the failure mechanism produced and number of repeated hits needed to open the breach. Of interest was also the evidence of cracking, more specifically the way it initiated on the undamaged walls and next propagated upon consecutive hits. The data generated from these tests are made available to support further investigations on masonry structures subjected to extreme actions.

Place, publisher, year, edition, pages
2023. Vol. 178, article id 104597
Keywords [en]
Impacts, Masonry, Out-of-plane, Arching, Digital image correlation (DIC), High-speed cameras
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:ri:diva-64373DOI: 10.1016/j.ijimpeng.2023.104597Scopus ID: 2-s2.0-85152227379&OAI: oai:DiVA.org:ri-64373DiVA, id: diva2:1752860
Note

This study was funded by the ÅForsk Foundation, through the ‘Young researcher’ granting scheme, grant agreement n. 20-335.

Available from: 2023-04-25 Created: 2023-04-25 Last updated: 2023-05-26Bibliographically approved

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Godio, MicheleFlansbjer, MathiasWilliams Portal, Natalie

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