Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effective base isolation combining low-friction curved surface sliders and hysteretic gap dampers
Abstract The re-centering capability represents a fundamental property of any effective isolation system. Indeed, a potential residual displacement after an earthquake, besides affecting the serviceability of the construction, may also result in increased peak displacements during aftershocks and future events. In curved surface sliders (CSSs), energy dissipation and re-centering capability are two competing aspects influenced by the friction coefficient and the state of lubrication of the sliding pad. On the one hand, the large energy dissipation capability of high-friction CSSs contributes to mitigate the displacement demand during strong events but negatively affects the re-centering behavior. On the other hand, low-friction CSSs exhibit a better re-centering behavior, but are expected to undergo large displacements that, in turn, imply large dimensions in plan and pose problems of possible pounding between adjacent buildings and damage of nonstructural elements, lifelines and utilities crossing the isolation joint. The present study proposes an efficient base-isolation system that combines low-friction CSSs with hysteretic gap dampers. The latter device introduces supplemental energy dissipation only when the displacement of the isolation system exceeds a threshold or initial gap while not being engaged otherwise. The mechanical properties of the gap damper are designed to provide a target energy dissipation such that the displacement demand of low-friction CSSs can be kept to the same level as that of high-friction CSSs. A parametric study comprising a series of nonlinear response history analyses and different CSS characteristics demonstrates that the supplemental dissipative mechanism of the gap damper does not impair the re-centering capability of the CSS isolators. These outcomes are additionally validated by comparing numerical simulations of a 3D base-isolated case-study frame with shake-table test results. The proposed base-isolation system efficiently combines satisfactory energy dissipation, which reduces the displacement demand, with high re-centering capability resulting in negligible residual displacements.
Highlights Effective base isolation layout combining low-friction CSSs and hysteretic gap dampers. Gap dampers introduce supplemental energy dissipation beyond a threshold displacement. Satisfactory energy dissipation, high re-centering capability and reduced displacement. Displacement demand is comparable or even lower than high-friction CSSs. Elimination of undesirable effects typical of high-friction CSSs at low-intensity earthquakes.
Effective base isolation combining low-friction curved surface sliders and hysteretic gap dampers
Abstract The re-centering capability represents a fundamental property of any effective isolation system. Indeed, a potential residual displacement after an earthquake, besides affecting the serviceability of the construction, may also result in increased peak displacements during aftershocks and future events. In curved surface sliders (CSSs), energy dissipation and re-centering capability are two competing aspects influenced by the friction coefficient and the state of lubrication of the sliding pad. On the one hand, the large energy dissipation capability of high-friction CSSs contributes to mitigate the displacement demand during strong events but negatively affects the re-centering behavior. On the other hand, low-friction CSSs exhibit a better re-centering behavior, but are expected to undergo large displacements that, in turn, imply large dimensions in plan and pose problems of possible pounding between adjacent buildings and damage of nonstructural elements, lifelines and utilities crossing the isolation joint. The present study proposes an efficient base-isolation system that combines low-friction CSSs with hysteretic gap dampers. The latter device introduces supplemental energy dissipation only when the displacement of the isolation system exceeds a threshold or initial gap while not being engaged otherwise. The mechanical properties of the gap damper are designed to provide a target energy dissipation such that the displacement demand of low-friction CSSs can be kept to the same level as that of high-friction CSSs. A parametric study comprising a series of nonlinear response history analyses and different CSS characteristics demonstrates that the supplemental dissipative mechanism of the gap damper does not impair the re-centering capability of the CSS isolators. These outcomes are additionally validated by comparing numerical simulations of a 3D base-isolated case-study frame with shake-table test results. The proposed base-isolation system efficiently combines satisfactory energy dissipation, which reduces the displacement demand, with high re-centering capability resulting in negligible residual displacements.
Highlights Effective base isolation layout combining low-friction CSSs and hysteretic gap dampers. Gap dampers introduce supplemental energy dissipation beyond a threshold displacement. Satisfactory energy dissipation, high re-centering capability and reduced displacement. Displacement demand is comparable or even lower than high-friction CSSs. Elimination of undesirable effects typical of high-friction CSSs at low-intensity earthquakes.
Effective base isolation combining low-friction curved surface sliders and hysteretic gap dampers
De Domenico, Dario (Autor:in) / Gandelli, Emanuele (Autor:in) / Quaglini, Virginio (Autor:in)
26.11.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Static and Dynamic Friction in Curved Surface Sliders
| British Library Conference Proceedings | 2010
| British Library Conference Proceedings | 2012
| Springer Verlag | 2024