{"type": "FeatureCollection", "features": [{"id": "20.500.11850/631801", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-23T16:25:02Z", "type": "Journal Article", "created": "2023-09-05", "title": "Application of the \u0395xtended KDamper to the Seismic Protection of Bridges: Design Optimization, Nonlinear Response, SSI and Pounding Effects", "description": "Open AccessThe paper investigates the seismic performance of a novel passive vibration isolation and damping device termed Extended KDamper (EKD). The concept is applied to a representative two-span highway bridge, initially designed on conventional seismic isolation (CSI) bearings. An optimization process is developed and executed to design the EKDs, underscoring the importance of accounting for seismic motion variability. Compared to CSI, the incorporation of EKDs leads to a 40% to 70% reduction in deck drifts. In contrast to the CSI bridge, which may sustain excessive bearing shear strains when subjected to the most adverse seismic motions within the examined set, the bearings of the EKD bridge never exceed the 200% threshold. Through the use of nonlinear 3D time-history analyses, it is demonstrated that the nonlinearity of the EKD elements may result in residual deck drifts. The nonlinear EKDs exhibit a variation in maximum drifts and accelerations on the order of\u2009\u00b120% compared to the preliminary (linear elastic) design for the examined set of spectrum-compatible motions. The increased accelerations result from the stiffening of the negative stiffness elements (NSEs), being more pronounced for seismic motions that entail large displacement demands. With the aid of a fully nonlinear 3D model of the entire soil \u2013 foundation \u2013 structure system, the effects of soil-structure interaction (SSI) are explored and shown to significantly influence the seismic response of the system. Deck collision with the abutments restricts the movement of the deck and pier; however, it compromises the performance of the EKDs and leads to a substantial increase in deck accelerations. Overall, EKDs may facilitate a more economical design and enhanced seismic performance, particularly for displacement-sensitive structures like rail bridges.", "keywords": ["negative stiffness", "bridges", "Seismic isolation; bridges; KDamper; negative stiffness; earthquakes; vibration control", "KDamper", "vibration control", "Seismic isolation", "earthquakes"]}, "links": [{"href": "https://www.tandfonline.com/doi/pdf/10.1080/13632469.2023.2250463"}, {"href": "https://doi.org/20.500.11850/631801"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Earthquake%20Engineering", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "20.500.11850/631801", "name": "item", "description": "20.500.11850/631801", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/20.500.11850/631801"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-09-05T00:00:00Z"}}, {"id": "10.1016/j.engstruct.2024.118894", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-23T16:15:57Z", "type": "Journal Article", "created": "2024-09-06", "title": "Experimental testing and numerical validation of the \u0395xtended KDamper: A negative stiffness-based vibration absorber", "description": "ISSN:0141-0296", "keywords": ["Seismic isolation; Negative stiffness; Damping mechanisms; Experimental validation; Vibration absorber; KDamper", "0103 physical sciences", "02 engineering and technology", "01 natural sciences", "0201 civil engineering"]}, "links": [{"href": "https://doi.org/10.1016/j.engstruct.2024.118894"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Engineering%20Structures", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.engstruct.2024.118894", "name": "item", "description": "10.1016/j.engstruct.2024.118894", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.engstruct.2024.118894"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-12-01T00:00:00Z"}}, {"id": "10.1016/j.soildyn.2018.12.017", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-23T16:16:55Z", "type": "Journal Article", "created": "2019-01-09", "title": "Modeling of high damping rubber bearings under bidirectional shear loading", "description": "Abstract   The behavior of high damping rubber bearings is highly complex. The models that are currently available are generally limited to unidirectional motion and, in most cases, difficult to extend to general bidirectional loading. One of the major limitations is their inability to characterize the behavior of the bearings at different levels of shear deformation. In the present work, a set of bidirectional models are presented, obtained by combining relatively simple bi-dimensional formulations. The models are calibrated over a set of unidirectional test data and are shown to accurately describe the response of the bearings at low, intermediate and high strain levels using a single set of parameters. Validation is carried out using bidirectional displacement-controlled tests available in the literature and numerical simulations are performed of a base-isolated building subjected to free vibration and bidirectional earthquake excitation.", "keywords": ["ta212", "high damping rubber bearings (HDRB)", "mathematical modeling", "02 engineering and technology", "Seismic Isolation", "01 natural sciences", "0201 civil engineering", "0104 chemical sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.soildyn.2018.12.017"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Dynamics%20and%20Earthquake%20Engineering", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soildyn.2018.12.017", "name": "item", "description": "10.1016/j.soildyn.2018.12.017", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soildyn.2018.12.017"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-03-01T00:00:00Z"}}, {"id": "10.1080/13632469.2023.2250463", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-23T16:18:05Z", "type": "Journal Article", "created": "2023-09-05", "title": "Application of the \u0395xtended KDamper to the Seismic Protection of Bridges: Design Optimization, Nonlinear Response, SSI and Pounding Effects", "description": "Open AccessThe paper investigates the seismic performance of a novel passive vibration isolation and damping device termed Extended KDamper (EKD). The concept is applied to a representative two-span highway bridge, initially designed on conventional seismic isolation (CSI) bearings. An optimization process is developed and executed to design the EKDs, underscoring the importance of accounting for seismic motion variability. Compared to CSI, the incorporation of EKDs leads to a 40% to 70% reduction in deck drifts. In contrast to the CSI bridge, which may sustain excessive bearing shear strains when subjected to the most adverse seismic motions within the examined set, the bearings of the EKD bridge never exceed the 200% threshold. Through the use of nonlinear 3D time-history analyses, it is demonstrated that the nonlinearity of the EKD elements may result in residual deck drifts. The nonlinear EKDs exhibit a variation in maximum drifts and accelerations on the order of\u2009\u00b120% compared to the preliminary (linear elastic) design for the examined set of spectrum-compatible motions. The increased accelerations result from the stiffening of the negative stiffness elements (NSEs), being more pronounced for seismic motions that entail large displacement demands. With the aid of a fully nonlinear 3D model of the entire soil \u2013 foundation \u2013 structure system, the effects of soil-structure interaction (SSI) are explored and shown to significantly influence the seismic response of the system. Deck collision with the abutments restricts the movement of the deck and pier; however, it compromises the performance of the EKDs and leads to a substantial increase in deck accelerations. 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