Full-Scale Tests and Analytical Modeling of High-Damping Rubber Bearings Under Two Horizontal Directional Loading

Yamamoto, Masao; Minewaki, Shigeo; Yoneda, Harumi; Higashino, Masahiko; Wada, Akira

doi:10.3130/aijs.74.639

Cited by 19 publications

(12 citation statements)

References 2 publications

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“…From observation of the results shown in Figures and , the authors assumed that the restoring force is composed of a force directed to the origin and another force approximately opposite to the direction of movement, and proposed a rate‐independent model . The model identification procedure is as follows: Define a vector approximately in the direction of motion by using only the trajectory of displacement. Decompose the restoring force to a force F r directed to the origin and another force F s parallel to the above defined vector. Identify the magnitudes of F r and F s , separately. Compose the forces, F r and F s , in vector form.…”

Section: Analytical Modelingmentioning

confidence: 99%

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Nonlinear behavior of high‐damping rubber bearings under horizontal bidirectional loading: full‐scale tests and analytical modeling

Yamamoto

Minewaki

Yoneda

et al. 2012

Earthq Engng Struct Dyn

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SUMMARY Horizontal bidirectional loading tests are conducted for real‐sized high‐damping rubber (HDR) bearings with diameters of 700 mm (HDR700) and 1300 mm (HDR1300). The hysteresis loops of these bearings under bidirectional horizontal loadings are compared with those under unidirectional loadings. The results show that the bearing force measurement in the primary direction of loading increases when there is displacement in the orthogonal direction. Unusually, the maximum restoring force in the orthogonal direction to the primary loading direction occurs near zero displacement. On the basis of the observations of the restoring forces, a rate‐independent model is proposed. This model simulates well the test results under both bidirectional loading and unidirectional loading. It can reproduce the irregular restoring forces characteristics around zero displacement as described above. Bidirectional loading induced twist deformation in the HDR bearings that increased local shear strains. This phenomenon results in an early failure as observed in HDR700. The additional shear strain is estimated based on the twist deformation measured by video image analysis. The comparison of the nominal total shear stress demonstrates that the increase of shear stress because of bidirectional loading occurs when the average shear strain is larger than about 200%. The larger the shear strain, the greater the bidirectional effect. It is shown that the nominal total shear stress of average strain of 350% under bidirectional circular loading pattern is approximately the same as the average shear strain of 400% under unidirectional loading. This means that the average shear strain of 350% under a bidirectional circular loading corresponds to a local shear strain of 400%. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Analytical Modelingmentioning

confidence: 99%

“…From observation of the results shown in Figures 7 and 8, the authors assumed that the restoring force is composed of a force directed to the origin and another force approximately opposite to the direction of movement, and proposed a rate-independent model [17]. The model identification procedure is as follows:…”

Section: Model Identification Proceduresmentioning

confidence: 99%

Nonlinear behavior of high‐damping rubber bearings under horizontal bidirectional loading: full‐scale tests and analytical modeling

Yamamoto

Minewaki

Yoneda

et al. 2012

Earthq Engng Struct Dyn

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“…General rubber bearings with high damping efficiency such as LRB and high damping rubber bearing (HDR) cause torsional deformation when subjected to bi‐directional loading. This is due to the inconsistency of the directions of the restoring force and the damping force . The torsion of LRB is relatively small compared to that of HDR and both sectional shapes of the bearing (circular or square) and the number of lead plugs do not significantly influence the amount of torsional deformation of LRB .…”

Section: Introductionmentioning

confidence: 99%

“…The effect of torsional behavior on the maximum shear strain of the LRB component in bi‐directional loading shall be quantitatively evaluated because the fundamental concept of FSLRB is to initiate sliding before the LRB component exhibits an excessive shear strain. Moreover, the significance of both bi‐directional dynamic loading and the utilization of actual‐size specimens in isolation device testing is widely known as a result of progress in experimental studies . Considering the aforementioned facts, the authors conducted a variety of tests, including bi‐directional dynamic loading tests of actual‐size FSLRB specimens.…”

Section: Introductionmentioning

confidence: 99%

Practical application of lead rubber bearings with fail‐safe mechanism

Hamaguchi

Wake

Yamamoto

et al. 2019

Japan Architectural Review

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The results of dynamic and quasi‐static loading tests for scaled and full‐scale Lead Rubber Bearing with Fail‐Safe mechanism, an alternative isolation bearing that consists of a conventional lead rubber bearing and a slider bearing in series, are discussed. The test results show that the torsional behavior of the lead rubber bearing component in bi‐directional loading does not significantly affect the limit state of the bearing. Moreover, both dynamic and static friction coefficients are estimated with high accuracy by utilizing a newly proposed effective surface pressure instead of the conventional mean surface pressure. The proposed bearing can be used in practical applications in an isolation system with a high seismic safety margin.

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“…Therefore, measures that reduce the seismic responses of bridge structures are of considerable importance. Seismic isolation achieves high seismic performance for the seismic safety of bridge structures (Yamamoto et al, 2009). Rubber bearings are standard components of these bridge isolation systems.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Test on a Simply Supported Bridge With High-Damping Rubber Bearings

Yang

Cai

Lai

et al. 2020

Front. Built Environ.

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In this study, hybrid simulation techniques are used to test earthquake excitation on a supported bridge with High-damping rubber (HDR) bearings, which are widely used in girder bridges. It is impractical to make a full-scale or large-scale test of a whole bridge in the laboratory and substructure hybrid simulation techniques can overcome these scale issues to some extent. Using the software framework OpenFresco, the study involved a continuous exchange of data between a numerical model and a physical specimen. An experimental bearing element is introduced to the HDR bearings, and the remainder of the structure is modeled with beam-column elements for numerical analysis. These hybrid simulation results match the analytical results under the designated earthquake excitation. Therefore, this technique reproduces the seismic performance of a simply supported bridge with HDR bearings. This series of dynamic hybrid simulations of a simply supported bridge provides useful insights into the selection of HDR bearings. The study analyses and discusses the mechanical properties of these HDR bearings when subject to earthquake excitations.

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Full-Scale Tests and Analytical Modeling of High-Damping Rubber Bearings Under Two Horizontal Directional Loading

Cited by 19 publications

References 2 publications

Nonlinear behavior of high‐damping rubber bearings under horizontal bidirectional loading: full‐scale tests and analytical modeling

Nonlinear behavior of high‐damping rubber bearings under horizontal bidirectional loading: full‐scale tests and analytical modeling

Practical application of lead rubber bearings with fail‐safe mechanism

Hybrid Test on a Simply Supported Bridge With High-Damping Rubber Bearings

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