Influence of historic roof structures on the seismic behaviour of masonry structures

Keller, Alexandra; Parisi, Maria Adelaide Vittoria; Tsakanika, Eleftheria; Moșoarcă, Marius

doi:10.1680/jstbu.19.00098

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…For the models, the timber elements of the roof structures were modelled 1D members and the masonry walls as orthotropic 2D elements. Concerning the material properties, it was decided to use code-based mechanical properties for the timber (D18) and the historic masonry [11], since only few laboratory tests have been performed on historic timber and brick in Timisoara.…”

Section: Characteristics Of the Modelsmentioning

confidence: 99%

“…Considering this observations, a study has been performed in Timisoara, concerning the effect of three representative roof structure types on the seismic behaviour of a characteristic historic masonry building from the 18 th century by evaluating the out of plane displacement of the walls, their damage level and the internal forces by also highlighting the effect of the decay of the timber elements on this behaviour [11].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Historic Timber Roof Structures on the Structural Behaviour of Masonry Buildings during Seismic Events

Keller¹,

Moșoarcă²

2021

12th International Conference on Structural Analysis of Historical Constructions

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Roofs are complex elements of heritage structures which are not only meant to protect the building from exterior methodological factors but are also defining the skyline of a city while highlighting the importance and aesthetics of the building they belong to. However, in seismic areas, roof structures prove out to either trigger the out-of-plane behaviour of historic masonry buildings [1] or reduce the horizontal displacement, depending on their type and their connection to the masonry walls [2]. The study is therefore aiming do highlight the effect of common roof structure types from Timisoara, a city placed in the western part of Romania, subjected to shallow earthquakes, on the seismic behaviour of a local type of masonry structure, with a ground-floor and 2 upper floors, from the 18th century.Throughout the study, three different types of roof structures were placed on the same masonry building and the out-of-plane horizontal displacement, inter-story drift, damage level and internal forces were assessed. The main scope of the study is to highlight how the chosen roof structures from the 18 th , 19 th and 20 th century, would influence the behaviour of a masonry building during seismic events. Detailed numerical simulations using finite element models of the building and the three roof structures were performed in order to obtain the four assessed parameters, which prove that, depending on the connection to the masonry walls and the state of conservation of the timber elements, roof structures would significantly improve the seismic behaviour of historic masonry buildings in this area.

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Section: Characteristics Of the Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Historic Timber Roof Structures on the Structural Behaviour of Masonry Buildings during Seismic Events

Keller¹,

Moșoarcă²

2021

12th International Conference on Structural Analysis of Historical Constructions

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“…The roof structures, placed on the buildings facing the street were very rigid, being composed of two layers of structural elements in the transversal direction (interior strutting device and exterior rafters connected by a collar beam) and diagonal elements placed between the rafters in the longitudinal direction [4,5]. The buildings also had steel straps in the transversal direction connecting the exterior walls.…”

Section: The Structure and Its State Of Conservationmentioning

confidence: 99%

Preserving Historic Bearing Structures by Prudent Integration in New Structures

Moșoarcă¹,

Stoian²,

Florea³

et al. 2021

12th International Conference on Structural Analysis of Historical Constructions

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For the effective consolidation of damaged historic load-bearing structures, it is necessary for the designer to understand the causes of the damage but also to know and apply the most effective consolidation methods, in order not to affect the cultural value of the building. The problem becomes even more complex for the designer when it is desired only to keep a damaged area of a historic building, which was part of an aggregate of historic buildings. Keeping this area is needed because buildings have been seismically interacting over the past 150 years, and it is necessary to maintain the static equilibrium of the building aggregate.In most cases, in order to safeguard a damaged historic building, is achieved by consolidating the structural elements composing the building, resulting in extensive consolidation areas, long construction periods and expensive and hard to implement solutions. Additionally, it is challenging to predict the response of the building over time to various actions without continuous monitoring, which is difficult to achieve, because of the disturbance on building occupants. The paper presents an alternative solution of safeguarding interventions on a historic building,damaged by settlement and earthquakes, through its prudent connection to the load-bearing structure of a new building. The building is located in the St. Gheorghe Square in Timisoara, Romania, located in the Banat seismic area with a peak ground acceleration of 0,20g [1]. This alternative solution saves the historic building from the total demolition, has the advantage of minimal consolidation interventions, but also preserves the historical balance between the buildings of the aggregate. The efficiency of the alternative solution is highlighted by a comparative presentation of the internal forces and deformations recorded in different areas

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“…Studies performed on different roof structures from Timisoara brought forward that in the 18th and 19th century, roof structures were highly connected from an urban, architectural and philosophical point of view to their surroundings and to the building they belong to [15][16][17][18]. Since the city significantly developed at the beginning of the 20th century and roofs had an important role in defining the aesthetics and monumentality of the new buildings, an multi and inter-disciplinary analysis was also performed on the Löffler Palace, an imposing 20 th century palace which could highlight the importance of also consider urban planning principles, architectural and philosophical principles during the assessment of historic timber roof structures.…”

Section: Introductionmentioning

confidence: 99%

Interdisciplinary Assessment, Analysis and Diagnosis of a Historic Timber Roof Structure From the 20th Century

Isopescu¹,

Keller²,

Stoian³

et al. 2021

12th International Conference on Structural Analysis of Historical Constructions

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Historic roof structures are complex systems which cannot be assessed individually but need a more holistic approach, in order to understand them as a whole. The great variety of contexts in which the building and its roof were placed, of architectural styles which ultimately influence the shape of the roof but also the diversity of technical solutions used by the craftsman to respond to these needs and its state of conservation, make a multidisciplinary approach necessary. While 18th and 19th century roof structures from Timisoara, a city from the western part of Romania, proved out to be complex structures which a high value from urban planning, architectural, symbolical and structural point of view, the 20th century is a period of transition with a wide array of influences, mix of styles and technological improvement of the structures.Therefore, based on the roof structure of the Löffler Palace, built between 1912Palace, built between -1913 in the historic centre of the city, the paper tries to highlight that roof structures from this period are also far more than structural systems. Based on a thorough historical analysis and visual inspection of the structure, by using a multidisciplinary assessment procedure [1], the paper shows that 20th century roof structures are closely related to the building they belong, to their context and have a significant philosophical/symbolic and aesthetical value.At the same time, the procedure also addresses the role of assessment, diagnosis, conservation and maintenance, the structural integrity of the roof, its influence on the seismic behaviour of the historic building, highlighting the connection between the roof, the building and its environment.

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Influence of historic roof structures on the seismic behaviour of masonry structures

Cited by 7 publications

References 17 publications

Effect of Historic Timber Roof Structures on the Structural Behaviour of Masonry Buildings during Seismic Events

Effect of Historic Timber Roof Structures on the Structural Behaviour of Masonry Buildings during Seismic Events

Preserving Historic Bearing Structures by Prudent Integration in New Structures

Interdisciplinary Assessment, Analysis and Diagnosis of a Historic Timber Roof Structure From the 20th Century

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