A base isolation system for structures subject to extreme seismic events characterized by anomalous values of intensity and frequency content

Cancellara, Donato; Angelis, Fabio De

doi:10.1016/j.compstruct.2016.09.002

Cited by 35 publications

(9 citation statements)

References 16 publications

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“…Inter-story drifts, base shear, and isolator displacements of the original as well as the retrofitted silo have been compared. The seismic performances of the multi-storey building made of reinforced concrete provided with two types of isolation devices such as lead rubber bearings (LRBs) and high damping hybrid seismic isolator (HDHSI) are compared [7]. A nonlinear dynamic analysis delineates HDHSI base isolation system provides good seismic protection to the multi-storey RC building.…”

Section: Introductionmentioning

confidence: 99%

Effects of Fundamental Natural Time Periods on the Seismic Performance of Base Isolated Multistory Buildings

Pandian

suresh²,

2023

Preprint

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This research is mainly dealt with determining the effectiveness of base isolation in multiple degree of freedom systems (MDOF) of different fundamental natural time periods (FNTP). Base isolation devices avert the detrimental ground shaking to maximum extends and mitigates the lateral forces caused by earthquakes. In this research, it is intended to study about under what circumstances base isolation system will be effective in reducing the lateral forces caused by earthquakes. Every MDOF system will be having its own FNTP with respect to its mass, stiffness and damping matrices. In order to determine the effectiveness of base isolation, five number of five-story buildings of different FNTP, i.e., 0.4 sec, 0.8 sec, 1.2 sec, 1.6 sec and 2.0 sec had been selected. Different FNTP were obtained by maintaining constant mass as well as damping matrices while changing stiffness matrix for each building. Subsequently, comparison was made between the structural responses of buildings with and without providing base isolation. Finally, it was found out that a building of lower FNTP was performing well when it was provided with base isolation.

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Section: Introductionmentioning

confidence: 99%

Effects of Fundamental Natural Time Periods on the Seismic Performance of Base Isolated Multistory Buildings

Pandian

suresh²,

2023

Preprint

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“…The working principle of isolation is to reduce the seismic forces transmitted to the structure by the rigid elements in the vertical direction, and by flexible elements in the horizontal direction placed in the building base; and to absorb the seismic energy and movements. The technical advantages of this method are shown experimentally [1,2], numerically [3,4] and by finite-element models [2]. In addition, some researchers [5] evaluated the seismic isolation method comparatively by performing non-linear analyses with the help of static analyzing programs.…”

Section: Introductionmentioning

confidence: 99%

Installation and Maintenance Principles of Seismic Isolators: Erzurum Health Campus

Sagiroglu¹,

Maali²,

Aydın³

2018

TOCIEJ

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Background:The objective of isolation is to reduce the seismic forces transmitted through the structure using active and/or passive insulation systems.Seismic isolators, which are passive insulation systems and are placed between the foundation of the structure and the structure, are discussed throughout this study. Isolators consist of rubber layers that have horizontal flexibility, steel layers that increase rigidity and a lead or ball core, which increases vertical stiffness. Installation and maintenance of seismic isolators require great care in order not to exceed the displacements/section forces envisaged at the design of the structure during the earthquake.Objective:Installation and maintenance principles of the friction pendulum type isolators used in Erzurum Health Campus (hospital) are presented throughout this study. While the seismic isolators are anchoraged to directly concrete in the general application, they are placed between two steel plates of type S355J2 in this application, because of cold-weather conditions. To evaluate this condition, it is investigated the models with and without steel plate and compared to each other.Methodology:The models with and without steel plate were formed using finite-element method to compare the stress distributions on the isolator.Conclusion:The results demonstrated that the model with steel plates occur the uniform stress through surface and keep under control deformation of cross-section in the reinforced concrete.

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“…The main contribution of this work comes from the observation that passive base‐isolation systems are hysteretic . It is well known that these systems are dissipative, and their energy dissipation comes from the hysteresis effect of these devices . But being passive, they lack the benefits of active control.…”

Section: Introductionmentioning

confidence: 99%

“…[19][20][21][22] It is well known that these systems are dissipative, and their energy dissipation comes from the hysteresis effect of these devices. [19][20][21][22] But being passive, they lack the benefits of active control. The contribution of this work is precisely to take advantage of an hysteretic energy dissipator but increasing its efficiency with its active realization.…”

Section: Introductionmentioning

confidence: 99%

Hysteretic active control of base-isolated buildings

Pozo

Vidal

Garcia

et al. 2018

Struct Control Health Monit

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Summary In this work, an active control law for base‐isolated buildings is proposed. The crucial idea comes from the observation that passive base‐isolation systems are hysteretic. Thus, an hysteretic active control strategy is designed in a way that the control force is smooth and limited by a prescribed bound. Furthermore, given a specific actuator with a physically limited maximum force and maximum rate of change, it is proven that the design parameters in the contributed control law can be chosen such that the control signal inherently satisfies the actuator constraints. Eight different ground‐acceleration time‐history records and a model of a 5‐story building are used to study and compare the performance of a passive pure friction damper alone, with the addition of the proposed active control. Numerical analysis demonstrates that our control strategy effectively mitigates base displacement and shear without an increase in superstructure drift or acceleration.

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A base isolation system for structures subject to extreme seismic events characterized by anomalous values of intensity and frequency content

Cited by 35 publications

References 16 publications

Effects of Fundamental Natural Time Periods on the Seismic Performance of Base Isolated Multistory Buildings

Effects of Fundamental Natural Time Periods on the Seismic Performance of Base Isolated Multistory Buildings

Installation and Maintenance Principles of Seismic Isolators: Erzurum Health Campus

Hysteretic active control of base-isolated buildings

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