Testing and design protocol of dissipative devices for out-of-plane damage

D’Ayala, Dina; Paganoni, Sara

doi:10.1680/stbu.12.00087

Cited by 16 publications

(12 citation statements)

References 7 publications

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“…To design an anti-seismic device, experimental tests and performance checks are crucial. Overviews of existing testing techniques for dissipative devices for damage in masonry buildings due to OOP can be found in (D'Ayala and Paganoni 2014;Paganoni and D'Ayala 2010). As for the strengthening of masonry structures (Paganoni and D'Ayala 2014), also for the improvement of the dissipative behavior, tests are necessary to define the design process.…”

Section: Introductionmentioning

confidence: 99%

Experimental estimation of energy dissipation in rocking masonry walls restrained by an innovative seismic dissipator (LICORD)

Giresini

Solarino

Taddei

et al. 2021

Bull Earthquake Eng

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This paper presents an innovative anti-seismic device for controlling the out-of-plane rocking motion of masonry walls with traditional tie-rods, called LInear COntrolled Rocking Device (LICORD). LICORD is a low-impact box connected to the extremity of the traditional tie-rod designed to mitigate rocking for medium–high intensity earthquakes. Additionally, the paper widens the knowledge about the dynamic behavior of rocking walls through the interpretation of the results of an extensive experimental campaign performed on masonry specimens composed by clay brick and cementitious mortar. Firstly, the LICORD’s single components are tested to identify their stiffness and damping properties. Secondly, free vibration tests provide actual values of coefficients of restitution on free-standing walls and walls restrained by LICORD, where the walls vary for the height to thickness ratio. For the stockier wall, the ratio of experimental/analytical coefficient of restitution varies from 88 to 98%, whereas for the slender wall, the results are less scattered, with a minimum value of 95% and a maximum value of 96%. The restrained walls are characterized by coefficients of restitution from 5 to 25% less than the values found for unrestrained walls, depending on the equivalent viscous coefficient of the shock absorbers. Moreover, LICORD demonstrated to properly absorb and damp the oscillations of the wall and control its rocking motion, strongly reducing the number of impacts and the rotation amplitudes up to 70%. Considerations about the effect of one-sided motion on the assessment of coefficient of restitution are also given. The equivalent viscous damping coefficients are observed to be on the range 4% (unrestrained wall) and 7–20% for walls restrained by LICORD.

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Section: Introductionmentioning

confidence: 99%

Experimental estimation of energy dissipation in rocking masonry walls restrained by an innovative seismic dissipator (LICORD)

Giresini

Solarino

Taddei

et al. 2021

Bull Earthquake Eng

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“…Early work by Corradi et al (2016) suggested that, by using high-strength steel cords embedded in the mortar joints, a reinforced joint repointing could be formed and test results demonstrated that it is possible to increase the masonry shear capacity using this retrofitting method. A similar approach have been recently applied by other researchers (Babaeidarabad et al 2014;D'Ayala and Paganoni 2014;Wang et al 2016;D'Antino et al 2018;D'Ambra et al 2018;Casacci et al 2019). The basic idea is to use an inorganic matrix (i.e.…”

Section: Introductionmentioning

confidence: 99%

Out-of-plane reinforcement of masonry walls using joint-embedded steel cables

Corradi

Speranzini

Bisciotti³

2020

Bull Earthquake Eng

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The out-of-plane mechanism (rocking) of walls often causes fatalities and collapses of historic buildings during earthquakes. This paper addresses the problem of assessing the seismic resistance of walls subjected to out-of-plane bending, before and after reinforcement. A new retrofitting method, consisting in the use of high-strength steel cables fully embedded in the mortar bed joints was studied. An experimental investigation using fullscale brickwork specimens was therefore conducted in an attempt to assess the walls' structural response when these are subject to out-of-plane loads. Test results demonstrated that it is possible to increase the out-of-plane capacity with the proposed method. A simplified macro-element procedure is also presented along with recommendations for the calculation of the walls' capacity before and after the application of the steel cable reinforcement. Predictions of the magnitude of horizontal force required to cause out-of-plane failure using the proposed procedure and quasi-static analysis procedures are compared with the results of laboratory experiments.

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“…According to these documents, the benefits of possible upgrade interventions in terms of seismic performance must be weighed against the impact on the original aesthetic and structural authenticity of the building. A variety of systems are available [10], [11], [12], but technical codes are vague on design procedures and their implementation hardly follows.…”

Section: Introductionmentioning

confidence: 99%

Computational Validation of Dissipative Device for the Seismic Upgrade of Historic Buildings

Melatti¹,

D’Ayala²,

Modolo³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The lack of effective connections between sets of perpendicular walls often determines the local or global failure of heritage structures in case of seismic event. In order to address this problem, the paper focuses on retrofitting systems for masonry structures undergoing seismic load. Particularly, it concerns the behavior of two different types of anchoring stabilization systems that avoid the out-of-plane collapse mechanism of a masonry wall and restore the boxlike behavior. The response of the corner connection between two walls was investigated by numerical simulations. Initially, the model was tested in its original configuration to determine the type and the extent of the failure mode when a base acceleration is imposed. Afterwards, a traditional steel anchoring system was implemented in the corner connection to prevent the relative detachment of the walls for the same seismic input. Finally, a friction-based dissipative device was added to the steel ties to provide ductility to the system by allowing for a controlled relative displacement of the walls and reducing the concentration of stresses. The computational analysis showed that implementation of a dissipative device integrated with traditional steel anchors is effective in delaying the complete failure of the anchoring system. Moreover, it provides energy dissipation capacity through controlled displacement, reducing the stress in the surrounding material and allowing the model to withstand a larger intensity input.

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Testing and design protocol of dissipative devices for out-of-plane damage

Cited by 16 publications

References 7 publications

Experimental estimation of energy dissipation in rocking masonry walls restrained by an innovative seismic dissipator (LICORD)

Experimental estimation of energy dissipation in rocking masonry walls restrained by an innovative seismic dissipator (LICORD)

Out-of-plane reinforcement of masonry walls using joint-embedded steel cables

Computational Validation of Dissipative Device for the Seismic Upgrade of Historic Buildings

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