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

Gino, Diego; Anerdi, Costanza; Castaldo, Paolo; Ferrara, Mario; Bertagnoli, Gabriele; Giordano, Luca

doi:10.3390/app10248980

Cited by 12 publications

(9 citation statements)

References 30 publications

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“…This paper assumes that the axis of symmetry of the friction pendulum intersects the vertical line of the friction surface at O, P is the center of gravity of slider A and slider B, the length of OP is R, and the inclination of the friction surface is θ. So, the horizontal sliding displacement of the slider can be expressed as D = Rsinθ, W is the structural gravity of the friction pendulum, the two sliders are subjected to positive pressures T 1 and T 2 and ring spring support forces N 1 and N 2 , F is the horizontal restoring force of the two friction pendulum bearings' combined force, f 1 and f 2 are the friction forces on the slider, and K v is the stiffness of the ring spring [27,28].…”

Section: Horizontal Seismic Isolation Performance Of the Ring Spring-...mentioning

confidence: 99%

Research on the Seismic Isolation Effect of the Ring Spring–Friction Pendulum Bearing in the Dakai Underground Subway Station

Zhang

Jia

2023

Applied Sciences

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During strong earthquakes, the vertical seismic force becomes an essential factor affecting shallow underground structures that cannot be ignored. In this situation, it is proposed that ring spring–friction pendulum two-way seismic isolation bearings be set up at the bottom of such structures. Targeting the Dakai underground station and the Kobe earthquake, a soil-structure force model was established based on the damage to the underground structure and dynamic simulation was carried out using Abaqus software. The advantages of the ring spring–friction pendulum bearing over the ring spring bearing alone and the friction pendulum bearing alone were compared. The simulation results showed that the structure displayed a good seismic isolation effect in both horizontal and vertical directions after setting the ring spring–friction pendulum bearing. The deflection in the midspan of the roof reduced to less than 5 cm, the horizontal relative displacement of the structure reduced to less than 3 cm, there was no obvious damage to the structure, the axial pressure ratio of the mid-pillar reduced to less than 0.5, the axial force on the mid-pillar reduced by more than 50%, and the shear force reduced by more than 30%. In addition, by comparing the damage to the structure after setting the annular spring bearing and the friction pendulum bearing, we found that a vertical seismic isolation device is more crucial than a horizontal seismic isolation device for shallow underground structures. Setting a vertical damping device can make the structure retain part of the ductility and reduce the damage to the structure, so the ground vertical seismic mitigation design should be strengthened when a shallow underground structure is designed.

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Section: Horizontal Seismic Isolation Performance Of the Ring Spring-...mentioning

confidence: 99%

Research on the Seismic Isolation Effect of the Ring Spring–Friction Pendulum Bearing in the Dakai Underground Subway Station

Zhang

Jia

2023

Applied Sciences

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“…This leads to a large group of structural typologies that presents substantial weakness to the accelerations induced by ground motions [4]. Over the years, with the aim to improve the seismic response of RC buildings, the adoption of isolation systems as the friction pendulum devices (FPS) has been widely investigated [5]- [6]. In the same context, the presence of masonry infills in RC buildings can affect significantly their behavior and extensive investigations are available in literature [7]- [8].…”

Section: Introductionmentioning

confidence: 99%

“…The RC structure of the building has been modelled by means fiber-based cross section approach using the software SAP2000 [11]. The non-linear dynamic analyses have been exploited selecting 21 natural ground motions according to [5]- [6] each one characterized by the three accelerometric components. In particular, the structure supposed to have fixed-base (FB) and isolated-base (BI) has been analyzed considering the case of bare and masonry infilled frames configurations.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Effect of Masonry Infills on Response of Rc Buldings Equipped With FPS Devices: A Case Study

Gino,

Miceli,

Ricioppo

et al. 2023

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

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The assessment of existing structures and infrastructures located in areas with a relevant seismic hazard is one of the challenges for engineers over the last years. With reference to buildings built during 60's and 70's, most of them was realized as reinforced concrete (RC) framed structures disregarding seismic design issues in comparison to the current specifications. In order to enhance the seismic response to seismic actions of existing RC structures, over the years, the isolation system adopting friction pendulum (FP) devices turned out to be one of the most diffused. The aim of this work is to investigate the influence of the retrofitting intervention performed using single-concave friction pendulum devices (FPS) on the seismic response on an existing framed reinforced concrete building located in high seismicity region. The existing building presents both in plane and in elevation irregularities also related to the masonry infills. The effect of the masonry infills on the performance of the building is evaluated in probabilistic terms and useful recommendations for assessment of such kind of structures are reported.

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“…To address these problems, the provisions for earthquake-resistant structures outlined in ACI 318-19 [ 6 ] require the transverse reinforcement of a column to be anchored with 135° hooks and set stricter provisions on spacing. Many studies have been conducted to upgrade the seismic performance of existing RC buildings [ 7 , 8 , 9 ]. Analytical models for RC elements have been developed to improve the accuracy of seismic evaluation [ 10 ], and theoretical and numerical approaches for damage modeling of concrete structureshave also been discussed [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Existing Reinforced Concrete Columns with Non-Seismic Details under Low Axial Loads

Choi

Lee

2022

Materials

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Reinforced concrete (RC) columns of old existing buildings are vulnerable to earthquakes because the hoops comprising their transverse reinforcement are widely spaced and anchored using 90° hooks. This study extensively evaluated the seismic behavior of RC columns with such non-seismic details. Experiments were conducted by applying lateral cyclic loads to five full-scale column specimens with various transverse reinforcement details subjected to low axial loads. The experimental results demonstrated that the internal transverse crosstie had a significant confinement effect in the non-seismic detailed columns with 90° hoop anchor hooks. In addition, the lateral load–drift relationships, ductilities, and energy dissipation capabilities of the columns were not significantly affected by the hoop spacing or anchor hook angle when a low axial load was applied up to a drift ratio of 3.5% before failure. The evaluation model based on ASCE/SEI 41-17 was then shown to approximate the initial stiffness, maximum strength, and post-peak strength reduction behavior of the non-seismically reinforced column. This study was based on the experimental behavior of single column members, and it needs to be extended to research on frame structures in which columns are connected to beams and slabs.

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

Cited by 12 publications

References 30 publications

Research on the Seismic Isolation Effect of the Ring Spring–Friction Pendulum Bearing in the Dakai Underground Subway Station

Research on the Seismic Isolation Effect of the Ring Spring–Friction Pendulum Bearing in the Dakai Underground Subway Station

Evaluation of the Effect of Masonry Infills on Response of Rc Buldings Equipped With FPS Devices: A Case Study

Seismic Behavior of Existing Reinforced Concrete Columns with Non-Seismic Details under Low Axial Loads

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