Searched for: author%3A%22Mirra%2C+M.%22
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Mirra, M. (author), Ravenshorst, G.J.P. (author)
The region of Groningen (NL) has experienced increasing human-induced seismicity caused by gas extraction in the last decades. The local building stock, not designed for seismic loads, consists for more than 50% of unreinforced masonry buildings with timber diaphragms. In this context, a detailed seismic characterization of timber and masonry...
conference paper 2023
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Pagella, G. (author), Mirra, M. (author), Ravenshorst, G.J.P. (author), van de Kuilen, J.W.G. (author)
This work investigated the influence of knots on the compression strength of wooden foundation piles. The study involved 110 pile segments sawn from 18 spruce and 9 pine piles with a mean diameter of approximately 200 mm, and moisture contents above fiber saturation. The mechanical properties were determined performing both full-scale...
conference paper 2023
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Mirra, M. (author), Gerardini, Andrea (author), Ghirardelli, Sergio (author), Ravenshorst, G.J.P. (author), van de Kuilen, J.W.G. (author)
This work presents the application of timber-based retrofitting techniques to a case-study stone masonry church featuring a wooden roof from 18<sup>th</sup> century. From the static point of view, the original roof structure presented a number of undersized structural elements, and its members were poorly or not connected among each other and...
journal article 2023
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Mirra, M. (author), Pagella, G. (author), Gard, W.F. (author), Ravenshorst, G.J.P. (author), van de Kuilen, J.W.G. (author)
In the historic city centre of Amsterdam (NL), the most widespread foundation system consists of wooden piles. With the aim of modelling and predicting remaining service life of these foundations and the piles in particular, one of the possible methods for collecting data and monitoring their condition consists of micro-drilling (MD)...
conference paper 2023
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Mirra, M. (author)
Existing masonry buildings are very frequently part of the architectural context for several countries all over the world. These constructions often feature masonry walls as vertical structural elements, and timber floors and roofs as horizontal components. The often poor characteristics of masonry, along with the in-plane flexibility of the...
doctoral thesis 2022
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Mirra, M. (author), Ravenshorst, G.J.P. (author), de Vries, P.A. (author), Messali, F. (author)
In the province of Groningen (NL), where human-induced earthquakes take place due to gas extraction, a large part of the building stock is composed of brick masonry walls and timber diaphragms. In this framework, timber-masonry connections play a crucial role in the global seismic response of the buildings, but their properties and structural...
journal article 2022
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Mirra, M. (author), Ravenshorst, G.J.P. (author), van de Kuilen, J.W.G. (author)
In the field of seismic retrofitting, a common intervention to improve box-like behaviour in an existing building is the strengthening and stiffening of existing timber floors and roofs. However, these retrofitting methods should be carefully applied, because they change the static scheme and the buildings' response to earthquakes....
conference paper 2021
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Mirra, M. (author), Ravenshorst, G.J.P. (author), de Vries, P.A. (author), van de Kuilen, J.W.G. (author)
Timber diaphragms in existing buildings are often too flexible in their plane, and can thus potentially cause out-of-plane collapses of walls during earthquakes. A very efficient retrofitting method to increase their in-plane stiffness and energy dissipation is the overlay of plywood panels. However, the usual characterization of the floors by...
journal article 2021
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Ravenshorst, G.J.P. (author), van Dalen, J.H. (author), Mirra, M. (author), Steiger, René (author), van de Kuilen, J.W.G. (author)
In this work, the relationship for a socket-type connection in wooden foundation piles is investigated, and a trilinear moment-rotation diagram was determined by means of experiment.<br/>Numerical and analytical models confirmed that the material properties for compression perpendicular to the grain are governing for the connections’ strength...
conference paper 2021
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Mirra, M. (author), Ravenshorst, G.J.P. (author)
The inadequate seismic performance of existing masonry buildings is often linked to the excessively low in-plane stiffness of timber diaphragms and the poor quality of their connections to the walls. However, relevant past studies and seismic events have also shown that rigid diaphragms could be detrimental for existing buildings and do not...
journal article 2021
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Mirra, M. (author), Ravenshorst, G.J.P. (author), van de Kuilen, J.W.G. (author)
Historical or existing buildings are often composed of brick or stone masonry walls, and timber floors and roofs. When these buildings are subjected to earthquakes, the interaction among such structural components is essential to avoid collapse or excessive damage to the constructions. In this framework, a crucial role is played by the...
conference paper 2021
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Mirra, M. (author), Sousamli, M. (author), Longo, M. (author), Ravenshorst, G.J.P. (author)
In the region of Groningen (NL), human-induced earthquakes initiated by gas extraction are causing structural damage. In that area, the building stock is mainly composed of unrein- forced masonry (URM) buildings with light and flexible timber floors and roofs. Thus, an ex- perimental campaign was arranged for assessing the in-plane response of...
conference paper 2021
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Mirra, M. (author), Ravenshorst, G.J.P. (author), van de Kuilen, J.W.G. (author)
In-plane behavior of timber diaphragms is usually characterized by means of an equivalent shear stiffness. However, this value depends on how the stiffness of the floors is evaluated from the experimental tests. Although an increasing number of research studies have provided a deeper insight into the seismic characterization of as-built and...
journal article 2021
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Mirra, M. (author), Ravenshorst, G.J.P. (author), van de Kuilen, J.W.G. (author)
Traditional timber floors cannot normally withstand horizontal seismic loads without large deformations. This may lead to a corresponding out-of-plane collapse of masonry walls in existing buildings. This situation is even more critical in the Netherlands, around the city of Groningen, where human-induced earthquakes started to take place....
journal article 2020
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Mirra, M. (author), Ravenshorst, G.J.P. (author)
This document presents the complete overview on the test results obtained in the 2019 experimental campaign on timber-masonry connections, in as-built and strengthened configurations. The tests have been performed in two phases, the first phase in spring 2019 and the second phase in summer 2019. The aim of this test campaign was to characterize...
report 2019
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Mirra, M. (author), Ravenshorst, G.J.P. (author)
This document presents the interpretation of the test results obtained within the whole 2019 experimental campaign on timber-masonry connections, in as-built and strengthened configurations tested under monotonic, cyclic and dynamic loading. In this document, starting from those results, failure mechanisms are analysed, which could occur in each...
report 2019
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Ravenshorst, G.J.P. (author), Mirra, M. (author)
In this report an experimental pilot study on the seismic response of timber-masonry connections is presented
report 2018
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Ravenshorst, G.J.P. (author), Mirra, M. (author)
This report presents the materials, experiment setups and testing procedures directed at determining the back-bone curves that describe the plank-joist connections of samples extracted from existing unreinforced masonry houses. The last section contains an overview of the results obtained for the different specimens tested. The use of the...
report 2017
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Ravenshorst, G.J.P. (author), Mirra, M. (author)
This report presents the material properties of timber and fasteners specimen extracted from existing unreinforced masonry houses.
report 2017
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Ravenshorst, G.J.P. (author), Mirra, M. (author)
The in-plane strength and stiffness as well as the hysteretic behaviour of timber diaphragms is investigated by performing quasi-static cyclic tests. In this report the behaviour of traditional timber floors and roof configurations was studied representing a typical detached masonry house. The configurations are based on a case study from a...
report 2017
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