Fragility curves and seismic demand hazard analysis of rocking walls restrained with elasto‐plastic ties

Solarino, Fabio; Giresini, Linda

doi:10.1002/eqe.3524

Cited by 20 publications

(11 citation statements)

References 33 publications

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“…The original contribution of the paper consists in highlighting the influence of the geometric parameters of the façade and of its interlocking restraints with sidewalls on the church façade vulnerability to out-of-plane mechanisms with a large-scale approach. The results of this study may be a great support in assessing the reduction of seismic vulnerability together with the use of earthquake-resistant devices [15,16].…”

Section: Introductionmentioning

confidence: 66%

Fragility Curves for Rocking Masonry Façades of Churches: A Sensitivity Study of Vulnerability Parameters

Argiento,

Casapulla,

Ceroni

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Out-of-plane failure of façades is one of the most distinctive local mechanisms in masonry churches recognizable in the aftermath of a seismic event. The purpose of this paper is to derive large-scale fragility curves for masonry church façades using incremental static analysis, and to assess the influence of some parameters on their vulnerability. According to the displacement-based approach, pushover analysis is carried out considering both the geometric nonlinearities and the stabilizing contribution of frictional resistances exerted by the church sidewalls. The seismic demand is derived using acceleration-displacement response spectra (ADRS) for different limit states, obtained according to the Italian seismic code. The analyses are addressed with reference to a large sample of masonry churches generated starting from the geometric parameters of a reduced sample of churches hit by the seismic event of 21 st August 2017 in the Ischia Island (Italy). Several geometric aleatory variables, i.e. the length, the height and the thickness of the façade, are treated by means of the Monte Carlo simulation (MCS) to generate a numerical sample of 400 facades. Considering two limit states for rocking (moderate and severe motion), fragility curves are derived for these facades subjected to the same single ground motion scaled at different values of PGA, using incremental static analysis (ISA) and multiple stripe analysis (MSA). Finally, on the same sample of 400 facades, the sensitivity of the fragility curves to the friction coefficient, the length of masonry units and the position of the façade mass center is investigated.

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Section: Introductionmentioning

confidence: 66%

Fragility Curves for Rocking Masonry Façades of Churches: A Sensitivity Study of Vulnerability Parameters

Argiento,

Casapulla,

Ceroni

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Therefore, several analyses carried out on historic masonry buildings [10,11] as well as precast concrete structures [8] simply consider zero tensile resistance at joints as if they are mortarless (dry) joints. Furthermore, the typical strategies to improve the masonry capacity are the consolidation techniques with tie-rods or strength anchors [12,13] or the use of tie roads in particular to improve the stability of vaults or support walls [14].…”

Section: Introduction 1segmentation Of Masonry Curved Structures Throughout Historymentioning

confidence: 99%

Joint Layout Design: Finding the Strongest Connections within Segmental Masonry Arched Forms

Mousavian

Casapulla

2022

Infrastructures

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Segmental arched forms composed of discrete units are among the most common construction systems, ranging from historic masonry vaults to contemporary precast concrete shells. Simple fabrication, transport, and assembly have particularly made these structural systems convenient choices to construct infrastructures such as bridges in challenging environmental conditions. The most important drawback of segmental vaults is basically the poor mechanical behaviour at the joints connecting their constituent segments. The influence of the joint shape and location on structural performances has been widely explored in the literature, including studies on different stereotomy, bond patterns, and interlocking joint shapes. To date, however, a few methods have been developed to design optimal joint layouts, but they are limited to extremely limited geometric parameters and material properties. To remedy this, this paper presents a novel method to design the strongest joint layout in 2D arched structures while allowing joints to take on a range of diverse shapes. To do so, a masonry arched form is represented as a layout of potential joints, and the optimization problems developed based on the two plastic methods of classic limit analysis and discontinuity layout optimization find the joint layout that corresponds to the maximum load-bearing capacity.

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“…Similarly, Marotta et al (2021) have derived parametric fragility curves for churches, based on the damage observed on 21 mechanisms, taking into account vulnerability factors that worsen or improve the seismic response. On the other hand, fragility functions for single local mechanisms have been derived for both church façades (Giresini et al 2018;Solarino and Giresini 2021) and unreinforced masonry buildings (Nale et al 2021), using nonlinear dynamic analyses and probabilistic approaches. Notwithstanding, the literature on this topic is still rather limited, and the specific relevance of each mechanism on the damage to the whole church is still an open issue.…”

Section: Introductionmentioning

confidence: 99%

Damage assessment in single-nave churches and analysis of the most recurring mechanisms after the 2016–2017 central Italy earthquakes

Ceroni

Casapulla

Cescatti

et al. 2022

Bull Earthquake Eng

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Assessment of churches based on empirical data at a territorial scale is a suitable tool to have an overview of the seismic behaviour of this peculiar structural typology and to evaluate their current state of vulnerability. Fragility and vulnerability curves are also aimed to perform the analysis of different seismic scenarios. The paper presents a detailed typological analysis of 633 single-nave churches, as a selected subset of the database previously examined by the authors, with the aim of evaluating more in detail the influence of some parameters, such as masonry typology, church dimensions and presence of the bell tower, on the vulnerability of the overall church. Then, specific analyses are carried out to assess the influence played by single mechanisms on the definition of the overall damage index, with the focus of providing qualitative evaluations and explicit vulnerability and fragility curves related to the most recurring and significant collapse mechanisms. This is an original contribution of the paper in the field of the vulnerability assessment of churches, since nowadays little information is available in the literature about the damage levels related to specific mechanisms, while most attention is still focused on global damage.

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Fragility curves and seismic demand hazard analysis of rocking walls restrained with elasto‐plastic ties

Cited by 20 publications

References 33 publications

Fragility Curves for Rocking Masonry Façades of Churches: A Sensitivity Study of Vulnerability Parameters

Fragility Curves for Rocking Masonry Façades of Churches: A Sensitivity Study of Vulnerability Parameters

Joint Layout Design: Finding the Strongest Connections within Segmental Masonry Arched Forms

Damage assessment in single-nave churches and analysis of the most recurring mechanisms after the 2016–2017 central Italy earthquakes

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