Performance recovery of a repaired 4‐storey reinforced concrete structure subjected to shake‐table testing

SHEGAY, Alex; Miura, Kota; Akira, Mikawa; Maeda, Masaki; Seki, Munetoshi

doi:10.1002/eqe.3818

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…In this direction, a few research studies focused on innovative structural solutions that can be easily and quickly repaired in the aftermath of an earthquake. 56,57 For example, Zhang et al 57 investigated simple repairing techniques (i.e., retightening the bolts of the FDs) for a novel steel rocking CB joint with FDs to restore the initial performance without losing strength and stiffness. However, experimental evidence on suitable structural restoring techniques for structural performance recovery is still limited.…”

Section: Introductionmentioning

confidence: 99%

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Pseudo‐dynamic testing, repairability, and resilience assessment of a large‐scale steel structure equipped with self‐centering column bases

Elettore,

Freddi,

Latour

et al. 2024

Earthq Engng Struct Dyn

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Recent destructive seismic events have underlined the need for increasing research efforts devoted to the development of innovative seismic‐resilient structures able to reduce seismic‐induced direct and indirect losses. Regarding steel Moment Resisting Frames (MRFs), the inclusion of Friction Devices (FDs) in Beam‐to‐Column Joints (BCJs) has emerged as an effective solution to dissipate the seismic input energy while ensuring a damage‐free behavior. Additionally, recent studies have demonstrated the benefits of implementing similar damage‐free solutions for Column Bases (CBs). In this context, the authors have recently experimentally investigated a Self‐Centering CB (SC‐CB) aimed at residual drift reduction. Previous experimental tests only focused on the response of isolated SC‐CBs under cyclic loads. Conversely, the present paper advances the research through an experimental campaign on a large‐scale steel structure equipped with the proposed SC‐CBs, providing valuable insights into the global structural response and improved repairability. A set of eight Pseudo‐Dynamic (PsD) tests were conducted considering different records and configurations of the structure. The experimental results highlighted the effectiveness of the SC‐CBs in minimizing the residual interstory drifts and protecting the first‐story columns from damage, thus enhancing the structure's resilience. Moreover, the consecutive PsD tests allowed investigating the effectiveness of the reparation process in restoring the seismic performance of the ‘undamaged’ structure. An advanced numerical model was developed in OpenSees and validated against the global and component‐level experimental results. Incremental Dynamic Analyses were finally performed to investigate the influence of the SC‐CBs on the structure's seismic response while accounting for the record‐to‐record variability.

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Section: Introductionmentioning

confidence: 99%

“…In addition, experimental tests are also essential to evaluate and test the repairability of the structure. In this direction, a few research studies focused on innovative structural solutions that can be easily and quickly repaired in the aftermath of an earthquake 56,57 . For example, Zhang et al.…”

Section: Introductionmentioning

confidence: 99%

Pseudo‐dynamic testing, repairability, and resilience assessment of a large‐scale steel structure equipped with self‐centering column bases

Elettore,

Freddi,

Latour

et al. 2024

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…In addition, a few research studies are currently focusing on repairing methodologies for the structural performance recovery of buildings (e.g., [21]- [22]). For example, Zhang et al [21] demonstrated the efficiency of a simple repairing technique (i.e., re-tightening the bolts of the FDs) applied on a novel steel CB in restoring the initial performance of the structural system without loss of strength and stiffness.…”

Section: Introductionmentioning

confidence: 99%

Resilience Assessment of a two‐storey Steel Structure equipped with Innovative Connections

Elettore,

Freddi,

Latour

et al. 2023

ce papers

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In the last few decades, increasing research efforts have been devoted to the definition of innovative seismic resilient design strategies with the aim of reducing direct and indirect losses. Among others, the use of Friction Devices (FDs) for Beam‐to‐Column joints (BCJs) has emerged as an effective solution to ensure the damage‐free behaviour of steel Moment Resisting Frames (MRFs). Additionally, more recent research studies have revealed the benefits of replacing traditional full‐strength Column Bases (CBs) with innovative CBs promoting the residual drift reduction of steel MRFs. Additionally, several research studies developed and investigated structures that could be easily repaired after an extreme event, promoting a functional recovery of the structures and able to reinstate the original seismic performance in a short time. However, experimental research on suitable structural repair techniques is still marginal and the lack of confidence in the performance of repaired structures are relevant issues contributing to the high demolition rates. In this direction, an experimental campaign has been performed on a large‐scale steel structure equipped with BCJs with FDs and innovative CBs. Several pseudo‐dynamic tests have been performed and at the end of each test, the structure have been repaired by simply loosening the bolts of the FDs. Results demonstrated the effectiveness of repairing methodology.

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Similarity Design Method for Fluid–Structure Models in Underwater Shaking Table and Wave Tests

Chen,

Wu,

Zhao

et al. 2024

Earthq Engng Struct Dyn

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For shaking table tests, it is essential to increase the density of the structure by adding artificial masses, which serves as an equivalent density. This modification ensures adherence to the dynamic similarity criterion. However, for underwater shaking table and wave tests, the density of water cannot change, and an increase in the equivalent density of the structure results in a distortion of the test simulation of the fluid–structure interaction. To solve this problem, an innovative similarity law is proposed for the design of fluid–structure models by changing the cross‐sectional dimensions of the structure. A series of bidirectional underwater shaking table tests and unidirectional wave tests were conducted to validate the proposed similarity law, and the traditional similarity law was analyzed for comparison. The test results indicated that the traditional scale model predicted the hydrodynamic pressure acting on the prototype with an error of approximately 50%. In contrast, the proposed scale model reduced this error to about 10%. Furthermore, the relative errors in predicting the displacement, acceleration, and strain of the prototype using the proposed scale model were all below 15%. This demonstrated the reliability of the proposed similarity law applied in the test design for fluid–structure models in underwater shaking table and wave tests.

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Performance recovery of a repaired 4‐storey reinforced concrete structure subjected to shake‐table testing

Cited by 8 publications

References 19 publications

Pseudo‐dynamic testing, repairability, and resilience assessment of a large‐scale steel structure equipped with self‐centering column bases

Pseudo‐dynamic testing, repairability, and resilience assessment of a large‐scale steel structure equipped with self‐centering column bases

Resilience Assessment of a two‐storey Steel Structure equipped with Innovative Connections

Similarity Design Method for Fluid–Structure Models in Underwater Shaking Table and Wave Tests

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