Masonry walls with irregular texture of L’Aquila (Italy) seismic area: validation of a method for the evaluation of masonry quality

Rovero, Luisa; Alecci, Valerio; Mechelli, J.; Tonietti, Ugo; Stefano, Mario De

doi:10.1617/s11527-015-0650-2

Cited by 43 publications

(22 citation statements)

References 26 publications

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“…The first studies for assessing the seismic vulnerability of buildings already included the analysis of this typology of structures [14,18]. Recent studies have improved these methodologies in order to give a better estimation of the mechanical performance of this typology of building [31,32].…”

Section: Damage Grade Descriptionmentioning

confidence: 99%

Estimation of the Buildings Seismic Vulnerability: A Methodological Proposal for Planning Ante-Earthquake Scenarios in Urban Areas

2018

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Featured Application: Geographic Information System (GIS) estimation of ante-earthquake scenarios through a more functional and standardized method of seismic vulnerability evaluation of reinforced concrete buildings in urban areas. Abstract:In spite of the enhancements related to building construction, many regions still present a major level of seismic risk as a consequence of the high vulnerability of the urban configuration of their cities. An improved method to assess the seismic vulnerability of buildings in urban areas is proposed in this contribution in order to advance the management of seismic emergency scenarios. The methodology, mainly based on the cadastral database, allows for a more standardized implementation as a function on the typological, structural, and urban parameters of the buildings, reducing the level of uncertainties linked to these methodologies and giving continuity to the different RISK-UE published works. The generalization of the method to any urban area has also been improved by means of removing the parameters whose calibration is associated with a specific area. The methodology has been put into practice in the urban area of the city of Lorca (SE Spain), in the aftermath of the earthquake of 11 May 2011, due to the availability of well-documented data reported from this seismic event. The proposal, when it is combined with Geographic Information System (GIS) techniques, provides valuable information for the planning and management of post-earthquake emergency situations.

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Section: Damage Grade Descriptionmentioning

confidence: 99%

Estimation of the Buildings Seismic Vulnerability: A Methodological Proposal for Planning Ante-Earthquake Scenarios in Urban Areas

2018

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“…Such local behavior can be investigated by considering limit analysis and/or rocking approaches. For what concerns the first ones, collapse mechanisms are analyzed to define force and displacement capacities of walls and masonry arches, for which strengthening by means of traditional and innovative techniques improves also the global structural behavior . Rocking approaches generally apply when dealing with out‐of‐plane modes.…”

Section: Introductionmentioning

confidence: 99%

In situ free‐vibration tests on unrestrained and restrained rocking masonry walls

Giresini

Sassu

Sorrentino

2018

Earthq Engng Struct Dyn

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Summary In the out‐of‐plane assessment of rocking walls, a relevant and yet uncertain aspect is the influence of energy dissipated during motion due to impacts and restraints, such as a floor or tie rods. Therefore, in situ rocking tests on unrestrained and restrained unreinforced masonry walls, made of composite (rubble + blockwork) masonry, were performed and analyzed. The restraint is given by steel springs of assigned stiffness, simulating a floor connected to full‐scale (4 × 1 × 0.6 m3) specimens from a dismantling building. The specimens are displaced from a static equilibrium position and released, allowing to evaluate energy dissipation. The coefficient of restitution is estimated as the square root of consecutive peak velocities of the same sign, to take into account nonhomogeneities in walls. For unrestrained walls, experimental coefficients of restitution vary between 81 and 88% of analytical ones, confirming the latter as conservative. For restrained configurations, experimental coefficients of restitution are between 74% and 83% of analytical values of unrestrained walls. Hence, an additional energy damping can be ascribed to the springs. Equivalent viscous damping ratios of a nonlinear rocking system are calculated by considering a velocity logarithmic decrement, resulting between 6% and 8% (unrestrained condition) and between 8% and 10% (restrained condition). An analytical formula is proposed for estimating the coefficient of restitution for restrained walls if the dynamic properties of the unrestrained wall and the horizontal restraint are known. Finally, the relevance of a refined estimation of energy dissipation is discussed by means of numerical time history analyses.

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“…5). The phenomenon is relevant from seismic point of view [2][3][4], but it could be activated also by extreme climatic scenarios [5,6]. It can be reduced by temporary preventive steel rods [7] and evaluating the density of energy dissipated [8].…”

Section: Discussionmentioning

confidence: 99%

“…In most cases wide stocks of similar constructions are featured by different ages, constructive properties and maintenance levels. Recent destructive earthquakes that affected Italian territory displayed that seismic deficiencies of buildings are associated to a wide number of structural aspects, together local geotechnical features [1,2]. On the other hand, the management of a large number of social houses requires specific strategies to choice the buildings in which to address the attention of structural analysis.…”

Section: Introductionmentioning

confidence: 99%

Seismic response of a stock of social housings in Italy with r.c. and masonry materials.

Bonannini¹,

Cinotti²,

Puppio³

et al. 2017

Proceedings of the Second International Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2017)

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Masonry walls with irregular texture of L’Aquila (Italy) seismic area: validation of a method for the evaluation of masonry quality

Cited by 43 publications

References 26 publications

Estimation of the Buildings Seismic Vulnerability: A Methodological Proposal for Planning Ante-Earthquake Scenarios in Urban Areas

Estimation of the Buildings Seismic Vulnerability: A Methodological Proposal for Planning Ante-Earthquake Scenarios in Urban Areas

In situ free‐vibration tests on unrestrained and restrained rocking masonry walls

Seismic response of a stock of social housings in Italy with r.c. and masonry materials.

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