Effects of model-based design and loading on responses of base-isolated structures

Dushimimana, Aloys; Niyonseng, Aude Amandine; Decadjevi, Gildas Jesuskpedji

doi:10.18720/mce.92.12

Cited by 1 publication

(4 citation statements)

References 8 publications

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“…Furthermore, comparable values of U tmax are observed for Duzce and Elcentro earthquakes despite of their far different PGAs, hence strongly suggesting that PGA alone cannot characterize earthquake severity. This observation was also previously reported by [32,44]. In fact, displacement response of isolation system under long duration earthquakes was found to be very closely related to the duration and spectrum rather than PGA [2], and far-field earthquakes have been reported to have particular behaviour and hence cannot be characterized by their PGA as commonly adopted for near-fault ground motions [47,48]…”

Section: Superstructure Storey Displacementssupporting

confidence: 84%

“…where the coefficients α o and α 1 can be determined as shown by [32]. The hysteretic force of LCRB, f , can be modelled using the modified visco-plasticity model (Eq.…”

Section: Solution Methodsmentioning

confidence: 99%

“…Fig. 1g), (ii) the stability condition was assured when the stability of the bearing was achieved (that is, when the hysteretic behaviour or the bearing movement was found centred to ensure the movement of the superstructure was aligned with that of the base structure), (iii) the time instants condition was assured when the storey displacements reached their peaks simultaneously (with a 1 s difference tolerance) to ensure the linear rigid body motion, as previously detailed in the study by [32]. These three conditions incorporate both the isolator and the superstructure responses; hence their satisfaction can imply the effective control of an isolated base and superstructure.…”

Section: Structural Model and Optimization Proceduresmentioning

confidence: 99%

“…In fact, near-fault earthquakes were reported to cause hardening of the LCRB as a result of excessive tensile stresses, thereafter leading to large maximum accelerations [52]. Such large tensile stresses in the elastomer may also cause the development of bearing cracks and lead to buckling and rupture, thereby resulting in poor performance of the isolation system [10,32]; and can also cause tension [2] and softening in vertical direction [53]. Therefore, using LCRB alone in the isolation system under strong NF ground motions may, in some cases, be ineffective.…”

Section: Effects Of Coupling Lcrb With Nonlinear Fluid Viscous Dampermentioning

confidence: 99%

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Effects of Building Height and Seismic Load on the Optimal Performance of Base Isolation System

Dushimimana

Mbereyaho

et al. 2023

Arab J Sci Eng

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Seismic isolation has been widely accepted as one of the techniques that can be used to protect structures during earthquake ground motions. However, some challenges still exist such as the optimal control of excessive isolator shear strains imposed by some ground motions. The main purpose of this study was to assess the effects of building height variation and earthquake ground motion type on the optimal performance of the seismic isolation using lead core rubber bearing (LCRB). Nonlinear time history analysis for building models of various storeys isolated by LCRB and exposed to different real earthquakes was performed. To achieve this, the equations governing the motion of the isolated three different building models were presented, and an approach for solving the equations while taking into consideration of the optimized mechanical properties of the LCRB was developed. The LCRB performance was measured in terms of elastomer shear strains, derived after an optimal criterion leading to reliable substructure and superstructure responses was reached. The results showed that the combined effects of the earthquake type and building height significantly affect the substructure responses (maximum isolator displacement, energy dissipation capacity, maximum isolator force) and the superstructure responses (storey shear forces, storey drifts, floor displacements, and floor accelerations), which in some cases lead to a need for adding a fluid damper. In this regard, an attempt to couple the LCRB with nonlinear fluid viscous damper was made, and the performance of the hybrid was assessed. It was generally found that the hybrid can positively improve the substructure responses, thereby reducing the unwanted large elastomer shear strains without adversely affecting the superstructure responses.

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Section: Superstructure Storey Displacementssupporting

confidence: 84%

“…where the coefficients α o and α 1 can be determined as shown by [32]. The hysteretic force of LCRB, f , can be modelled using the modified visco-plasticity model (Eq.…”

Section: Solution Methodsmentioning

confidence: 99%

Section: Structural Model and Optimization Proceduresmentioning

confidence: 99%

Section: Effects Of Coupling Lcrb With Nonlinear Fluid Viscous Dampermentioning

confidence: 99%

See 2 more Smart Citations

Effects of Building Height and Seismic Load on the Optimal Performance of Base Isolation System

Dushimimana

Mbereyaho

et al. 2023

Arab J Sci Eng

Self Cite

View full text Add to dashboard Cite

show abstract

Effects of model-based design and loading on responses of base-isolated structures

Cited by 1 publication

References 8 publications

Effects of Building Height and Seismic Load on the Optimal Performance of Base Isolation System

Effects of Building Height and Seismic Load on the Optimal Performance of Base Isolation System

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