Seismic performance of an existing RC structure retrofitted with buckling restrained braces

Castaldo, Paolo; Tubaldi, Enrico; Federico, Selvi; Gioiella, Laura

doi:10.1016/j.jobe.2020.101688

Cited by 47 publications

(22 citation statements)

References 40 publications

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“…Some improvements in terms of acceleration demand reduction can be observed for acceleration value higher than 9 m/s 2 . More details may be found in [56].…”

Section: Seismic Demand Hazard Curvesmentioning

confidence: 99%

Seismic Performance of Structures Equipped With BRB

Castaldo¹,

Tubaldi²,

Gioiella³

2021

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

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Over the years, the buckling restrained braces (BRBs) have more and more become one of the best solutions for retrofitting or upgrading many existing reinforced concrete framed buildings located in areas with a high seismic hazard. The present investigation studies the effectiveness of BRBs used to seismically retrofit a reinforced concrete (RC) building in L'Aquila defining an advanced non-linear 3D model in OpenSees. The seismic performance of the investigated building is assessed developing the following comparisons: before and after the retrofit through BRBs. Adopting a hysteretic model specific for the BRBs, both non-linear static analyses and incremental dynamic analyses under a set of real ground motion records are carried out to build the seismic demand hazard curves. The numerical results highlighted the influence of the BRBs on the seismic performance of the system components also in relation to the effectiveness of the retrofit.

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“…Some improvements in terms of acceleration demand reduction can be observed for acceleration value higher than 9 m/s 2 . More details may be found in [56].…”

Section: Seismic Demand Hazard Curvesmentioning

confidence: 99%

Seismic Performance of Structures Equipped With BRB

Castaldo¹,

Tubaldi²,

Gioiella³

2021

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

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“…The cross-sections of the structural members (i.e., beams and columns) have been realized according to the fiber approach [25], as also developed in [28]. In particular, the mechanical properties of the fibers in each cross-section have been defined differentiating between concrete cover, core and longitudinal reinforcements.…”

Section: Numerical Simulation Of Seismic Response Of the Rc Building ...mentioning

confidence: 99%

Seismic Upgrading of Existing Reinforced Concrete Buildings Using Friction Pendulum Devices: A Probabilistic Evaluation

et al. 2020

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In many countries around the world a huge number of existing reinforced concrete (RC) structures have been realized without account for seismic detailing, even if they are located in areas subjected to high seismicity. In this context, several passive seismic protection techniques have been developed and applied to retrofit these structures such as, for an example, seismic isolation. The aim of this work is to characterize in probabilistic terms the seismic performance of a framed RC building retrofitted by means of sliding friction pendulum (FPS) devices. Specifically, the response of an existing RC building located in a high seismicity area in Italy is investigated. After the description of the main available information about the structure, a non-linear numerical model has been defined by means of fiber-elements approach. Then, non-linear dynamic analyses considering multiple recorded ground motions with the three accelerometric components have been carried out to assess the seismic response of the building with and without the retrofitting intervention composed of FPS isolators. Finally, the results are processed to achieve a probabilistic assessment of the seismic performance of the retrofitting intervention.

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“…The critical influence of the masonry infills on strength, stiffness and ductility of frame structures subjected to seismic actions is an important issue highlighted for several years by the researchers and widely addressed (Papia et al, 2003, Di Trapani et al, 2015. Recently, strategies of improvement of infilled structures' seismic capacity have been studied too, based on the introduction of dissipative devices (Zahrai et al 2015;Castaldo et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Prediction Equations for Out-of-Plane Capacity of Unreinforced Masonry Infill Walls Based on a Macroelement Model Parametric Analysis

et al. 2021

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In the seismic performance assessment of reinforced concrete (RC) frames, a reliable estimation of the capacity of unreinforced masonry (URM) infill walls is of utmost importance to ensure structural safety conditions.With particular attention to the Out-of-Plane (OoP) capacity of URM infill walls after In-Plane (IP) damage, the issue of defining reliable analytical prediction models for the assessment of the capacity is an ongoing study. In this paper, empirical equations are proposed for the evaluation of the infilled frame's OoP capacity, with or without IP damage, based on an extensive numerical parametric analysis, focusing on the influence of the key parameters that govern the mechanical model. The OoP capacity of URM infill walls, considering the variation in their geometrical and mechanical properties, was evaluated by using a macro-element model. The OoP strength was found to be largely influenced by compressive strength, slenderness ratio, aspect ratio, and additionally by the level of IP damage. The reduction of OoP strength and stiffness due to IP damage was largely governed by the strength and the slenderness ratio of the URM infill wall. The reliability of the proposed model was also proved by comparisons with experimental results and some of the analytical models already available in the literature. The proposed equations provide reliable estimates of the OoP capacity, by strongly indicating the suitability of the adopted macro-element model in capturing the OoP response of URM infills.

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Seismic performance of an existing RC structure retrofitted with buckling restrained braces

Cited by 47 publications

References 40 publications

Seismic Performance of Structures Equipped With BRB

Seismic Performance of Structures Equipped With BRB

Seismic Upgrading of Existing Reinforced Concrete Buildings Using Friction Pendulum Devices: A Probabilistic Evaluation

Prediction Equations for Out-of-Plane Capacity of Unreinforced Masonry Infill Walls Based on a Macroelement Model Parametric Analysis

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