The contribution of steel wallposts to out-of-plane behavior of non-structural masonry walls

Jough, Fooad Karimi Ghaleh

doi:10.1007/s11803-023-2161-4

Cited by 1 publication

(1 citation statement)

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“…Becker and Ezazi's study revealed that double-layer isolation by increasing upper-story displacement by 19% can reduce the relative displacement of the first story by 48% (Becker & Ezazi, 2016. Kim and Kang at a mid-story isolated tall building controlled by MR damper used multi-objective optimization to decrease the inter-story drifts (Kim & Kang, 2019). In the realm of seismic behavior and risk assessment, providing second layer of control to the system also leads to a significant stride in addressing uncertainties inherent in seismic events (Karimi Ghaleh Jough & Ghasemzadeh, 2023). The dynamic and unpredictable nature of seismic behavior necessitates a nuanced understanding of uncertainties, a focal point explored in many researches (Babaei & Zarfam, 2019;Karimi Ghaleh Jough & Beheshti Aval, 2018;Karimi Ghaleh Jough & Şensoy, 2020;Karimi Ghaleh Jough et al, 2021;Dithurson et al 2023).…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Evaluation of Tuned Vertical Isolation System for Seismic Risk Mitigation

Babaei,

Karimi Ghaleh Jough

2024

Journal of Applied Engineering Sciences

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Vertical isolation by dividing the building into two soft and stiff sub-systems benefits from the period shifts and the damping mechanism across the height. However, the displacement demand imposed on the soft sub-system is less applicable in congested urban areas. As a result, in this study, a hybrid system of vertical isolation system benefiting from a tuned soft subsystem divided into upper and lower portions is investigated. A parametric linear 3-Degree of Freedom (DoF) model of the system incorporating mass and frequency ratio of the sub-systems was introduced and analyzed by response spectrum in MATLAB. A closed-form solution for the system frequency and mode shapes was also established. Response spectrum analysis indicates increasing the Tuned Mass Damper (TMD)’s fundamental period to 2.5 times the soft sub-system’s, reduces its displacement to more than 40 percent. The Multi Degree of Freedom (MDoF) model of the system is parametrically generated in MATLAB. Time history analysis of the building subjected to 40 records with 2 and 10 percent probabilities of exceedance in 50 years compared with conventional vertical isolation reveals the lower soft sub-system displacement can be reduced up to 45 percent by shifting drift to upper stories. The innovative tuned vertical isolation by demonstrating superior control performance as comprises lower floors’ drift may be an applicable solution for adjacent high- and low-rise buildings.

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