<i>Seismic Isolation for Earthquake Resistant Structures</i>

Komodromos, Petros; Stiemer, S. F.

doi:10.1115/1.1421127

Cited by 38 publications

(55 citation statements)

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“…The idea of seismic isolation is rather simple: reduction of the earthquakeinduced inertial loads by shifting the fundamental frequency of the structure out of the dangerous-for-resonance range, Komodromos [2], and concentration of deformation and energy dissipation demands at the isolation system; seismic isolation reduces the inter-storey displacements and floor accelerations of the structure under strong seismic motion. The superstructure remains essentially undeformed, moving like a rigid body, which prevents damage to its structural and non-structural components; see fig.…”

Section: The Isolation Device -Steel Structure Combinationmentioning

confidence: 99%

On the dynamic response of hardening systems

Saar¹

2009

WIT Transactions on the Built Environment

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This paper relates to hardening systems, their response to dynamic forces and their contribution to seismic isolation of buildings' foundations.The free vibration curve for a structure of continuous gradual changing of period and frequency, the dynamic load factor (DLF) for a suddenly applied constant load, and the curve of resonance for a pulsating sinusoidal force, are analyzed from the perspective of a structural engineer, which is essentially different from that of a researcher.The paper suggests a new approach for base seismic isolation, which is a combination of a base isolation device and a hardening steel structure.While the contribution of the isolation device is its characteristically high flexibility, the contribution of the steel structure consists of a smooth reduction of the building's base displacement under a given earthquake.The combined isolation system also provides a gradual limitation of the building's base displacement under an unexpected increase of the earthquake's peak ground acceleration (PGA). Keywords: seismic isolation device, hardening steel structure, smooth reduction of base displacement, limitation of base displacement.

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Section: The Isolation Device -Steel Structure Combinationmentioning

confidence: 99%

On the dynamic response of hardening systems

Saar¹

2009

WIT Transactions on the Built Environment

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“…Seismic isolation is widely considered as an efficient earthquake-resistant design technology to improve the seismic performance of structures (Skinner et al, 1993;Naeim and Kelly, 1999;Komodromos, 2000). Although base isolation decreases the possibility of damage to a building, it induces large relative displacements at the isolation level due to the increased flexibility.…”

Section: Introductionmentioning

confidence: 99%

Effect of Planar Impact Modeling on the Pounding Response of Base-Isolated Buildings

Mavronicola

Polycarpou

Komodromos

2016

Front. Built Environ.

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During strong earthquake excitations, base-isolated buildings may collide, either with the surrounding moat wall or with adjacent buildings if the available clearance is exceeded. This undesirable possibility has been recently investigated by several researchers, adopting various types of force-based impact models. Evidently, an important issue that arises regarding such numerical studies is the way of taking into account potential impacts. This paper parametrically investigates the effects of impact modeling characteristics on the computed overall peak response of a base-isolated building that experiences structural pounding. Specifically, the Kelvin-Voigt impact model and various other modifications of this linear viscoelastic impact model are considered in the conducted analyses. In order to efficiently conduct this investigation, a specially developed software is used. The results indicate that the excitation's and isolator's characteristics do not significantly influence the variation in the normalized peak response of the superstructure. In contrast, the impact parameters can have a significant effect on the superstructures' peak accelerations with overestimations up to 70%. In general, the normalized peak response ratios of the interstory drifts tend to increase as the available seismic gap and the coefficient of restitution decrease, although the magnitude of the deviations is within 5%, which can be considered insignificant.

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“…Thesis, entitled 'Application of Seismic Isolation as a Performance-Based Earthquake-Resistant Design Method', and later published by the WIT Press [1]. This paper presents two special issues of the seismic response of base-isolated buildings that are investigated independently using custom-made software that utilizes advances in software engineering.…”

Section: Introductionmentioning

confidence: 99%

“…1a are elastomeric bearings in which one or more lead plugs are vertically inserted in order to provide a high initial stiffness and an additional hysteretic energy dissipation mechanism. The elastomeric rubber ensures the necessary restoring force to prevent permanent relative displacements at the isolation level, whereas the lead plug dissipates energy hysteretically during severe earthquakes, as it is forced by the steel plates to deform inelastically in shear after exceeding its yield stress [1].…”

Section: Introductionmentioning

confidence: 99%

“…The superstructure of a base-isolated building is oscillating as an almost rigid body, whereas the interstorey deflections and the absolute floor accelerations can be substantially decreased [1][2][3]. Large deformations are confined at the seismic isolation level, where seismic isolators, such as the lead rubber bearings (LRBs), can accommodate cycles of large strains.…”

Section: Introductionmentioning

confidence: 99%

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Computer-aided investigation of special issues of the response of seismically isolated buildings

Mavronicola¹,

Polycarpou²,

Papaloizou³

et al. 2015

Int. J. CMEM

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This paper presents indicative results from the numerical investigation of two special issues of the seismic behaviour of base-isolated buildings, using custom-made software that utilizes modern objectoriented design approaches. The first issue concerns the modelling of the nonlinear behaviour of seismic isolation systems, focusing on the lead rubber bearings (LRBs), which are among the most commonly used seismic isolation systems. In particular, the inaccuracies between the actual behaviour of the LRBs, which can be more precisely represented by the Bouc-Wen model, and the usage of a bilinear inelastic model, which is often used in practice, are assessed through numerical simulations and parametric analyses. The second issue concerns potential pounding of base-isolated buildings with adjacent structures, when the available clearance around a seismically isolated building is limited, during very strong earthquakes. The consequences of potential pounding and the influence of certain parameters on the overall seismic response of base-isolated buildings are also assessed through numerical simulations and parametric analyses using custom-made software.

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Seismic Isolation for Earthquake Resistant Structures

Cited by 38 publications

References 0 publications

On the dynamic response of hardening systems

On the dynamic response of hardening systems

Effect of Planar Impact Modeling on the Pounding Response of Base-Isolated Buildings

Computer-aided investigation of special issues of the response of seismically isolated buildings

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