Shaking Table Test of a Friction Sliding System on a Concrete Member with Variable Curvature Fabricated by a Three-dimensional Printer

Brito, Miguel B.; Akiyama, Mitsuyoshi; Seto, T.; Honda, Riki; Ishigaki, Naomitsu

doi:10.1080/13632469.2021.1991515

Cited by 9 publications

(1 citation statement)

References 26 publications

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“…However, communication with engineers in Peru (Prof. Marcial Blondet, video conference, February 10, 2021) and Cuba (Dr. Dario Candebat Sánchez, telephone conversation, February 2, 2021) has revealed that, in many low-income countries, these materials are not available at a low cost. Brito, Ishibashi, and Akiyama ( 2019 , 2020 , 2021 ) used concrete-steel friction interfaces and concave surfaces of varying geometry as inexpensive bearings for bridges. Restoring force was provided through gravity, and the measured friction coefficient was in the range of 0.3, which, even though it is higher than the friction coefficient of common Teflon-steel bearings, could be an improvement in comparison to conventional design.…”

Section: Introductionmentioning

confidence: 99%

Experimental Parametric Study and Phenomenological Modeling of a Deformable Rolling Seismic Isolator

Katsamakas

Vassiliou

2023

Journal of Earthquake Engineering

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This paper presents an extensive experimental study of a low-cost, high-performance seismic isolator comprising a deformable sphere rolling on concrete surfaces. Polyurethane spheres, with and without steel core, rolling on flat or spherical concrete plates, are investigated. Lateral cyclic tests under large displacements demonstrated a rolling friction coefficient between 3.7% and 7.1%. When tested in a shake table under 1170 ground motions, the isolators substantially reduced the acceleration transmitted to the superstructure (to less than 0.15 g) while maintaining reasonable peak and negligible residual displacements. A phenomenological model was calibrated on the lateral cyclic tests and predicted the shake table tests with reasonable accuracy.

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Section: Introductionmentioning

confidence: 99%

Experimental Parametric Study and Phenomenological Modeling of a Deformable Rolling Seismic Isolator

Katsamakas

Vassiliou

2023

Journal of Earthquake Engineering

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Life-Cycle Risk, Resilience, and Sustainability of Individual and Spatially Distributed Structures

Frangopol,

Akiyama

2024

Lecture Notes in Civil Engineering

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Field investigations after recent large earthquakes have confirmed that several structures were severely damaged and collapsed not only by the earthquake, but also by the subsequent tsunami, landslide, or fault displacement. Effect of material degradation due to chloride attack on structural performance should be considered when structures are located in a harsh environment. In addition, climate change has produced typhoons and hurricanes with extreme intensity in recent years. Sea-level rise could cause severe storm surges and tsunamis, and global warming is accelerating the deterioration of structures. When structures are exposed to these different types of hazards, it can be difficult to ensure their safety and additional performance indicators such as risk and resilience are needed. Several lessons were learned about the importance of investigating individual structures from the perspective of ensuring network functionality. A probabilistic life-cycle framework for quantifying the loss of functionality of road networks including bridges is needed. A risk-based decision-making approach at the network level is required to identify the dominant hazard and the vulnerable structures that require strengthening and retrofitting. After a catastrophic event, the functionality of transportation networks can be significantly degraded, resulting in catastrophic economic impacts. To quantify the promptness of recovery, it has become common to use the concept of resilience. In addition, the economic, environmental, and social impacts of disaster waste management systems need to be examined in terms of sustainability. Consequences related to resilience and sustainability need to be investigated and implemented in the risk assessment of road networks under multiple hazards. Life-cycle design and assessment methodologies can incorporate risk, resilience, sustainability and multiple hazards, learning from the lessons of past disasters. This keynote paper provides an overview of measures to ensure the functionality of individual and spatially distributed structures under multiple hazards from the perspectives of reliability, risk, resilience and sustainability.

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Experimental and numerical investigation on seismic performance of novel cable-restraining composite rubber bearings for highway bridges

Zhong,

Guo,

Dang

et al. 2024

Engineering Structures

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Shaking Table Test of a Friction Sliding System on a Concrete Member with Variable Curvature Fabricated by a Three-dimensional Printer

Cited by 9 publications

References 26 publications

Experimental Parametric Study and Phenomenological Modeling of a Deformable Rolling Seismic Isolator

Experimental Parametric Study and Phenomenological Modeling of a Deformable Rolling Seismic Isolator

Life-Cycle Risk, Resilience, and Sustainability of Individual and Spatially Distributed Structures

Experimental and numerical investigation on seismic performance of novel cable-restraining composite rubber bearings for highway bridges

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