Floor response spectra in isolated structures subjected to earthquakes weaker than the design earthquake-Part I: Isolation with high-damping rubber bearings

2010 ◽  
Vol 18 (6) ◽  
pp. 635-659 ◽  
Author(s):  
Tatjana Isaković ◽  
Jaka Zevnik ◽  
Matej Fischinger
Keyword(s):  
Response Spectra ◽  
Floor Response Spectra ◽  
High Damping Rubber Bearings ◽  
Isolated Structures ◽  
High Damping Rubber ◽  
Design Earthquake ◽  
Rubber Bearings

scholarly journals Seismic Responses of NPP Structures Considering the Effects of Lead Rubber Bearing

2020 ◽  
Vol 10 (6) ◽  
pp. 6500-6503
Author(s):  
D. D. Nguyen ◽  
C. N. Nguyen
Keyword(s):  
Cross Sections ◽  
Nuclear Power ◽  
Low Frequency ◽  
Time History ◽  
Response Spectra ◽  
Floor Response Spectra ◽  
Lead Rubber Bearing ◽  
Isolated Structures ◽  
Rubber Bearings ◽  
Lumped Masses

Abstract-This study investigates the effects of Lead Rubber Bearings (LRBs) on Floor Response Spectra (FRS) of Nuclear Power Plant (NPP) structures. Three main structures in the Advanced Power Reactor 1400 (APR1400) NPP including the reactor containment building, an internal structure, and an auxiliary building were numerically developed in SAP2000. The structures were modeled using beam stick elements, and lumped masses were assigned to beam element nodes. All equivalent section properties of beam elements were calculated based on the designed cross-sections of the structures. A series of 40 ground motions with response spectra scaled to match the NRC 1.60 spectrum were utilized in numerical time-history analyses. Finally, a thorough comparison of FRS was conducted at different elevations of the structures, considering both with and without LRB. Numerical results showed that the FRS of base-isolated structures at higher elevations was significantly reduced compared to non-isolated structures. However, at lower elevations, the FRS was higher for the base-isolated structures compared to the non-isolated ones. Additionally, at a low-frequency range, roughly smaller than 3 Hz, the FRS of base-isolated structures was always greater than that of the non-isolated ones.

Seismic response prediction of base-isolated structures with high damping rubber bearings

2015 ◽  
Vol 39 (1) ◽  
pp. 12-25
Author(s):  
Yin-Han Yang ◽  
Jenn-Shin Hwang ◽  
Shiang-Jung Wang ◽  
Chia-Yi Shiau ◽  
Nobuo Murota
Keyword(s):  
Seismic Response ◽  
Response Prediction ◽  
High Damping Rubber Bearings ◽  
Isolated Structures ◽  
High Damping Rubber ◽  
Rubber Bearings

Seismic Analysis and Comparison of Different Base Isolation Systems for a Multi-Storey RC Building with Irregularities in Plan

2012 ◽  
Vol 594-597 ◽  
pp. 1788-1799 ◽  
Author(s):  
Donato Cancellara ◽  
Fabio de Angelis
Keyword(s):  
Base Isolation ◽  
Seismic Analysis ◽  
Cyclic Behavior ◽  
Isolation System ◽  
High Damping Rubber Bearings ◽  
Fixed Base ◽  
Base Isolation System ◽  
High Damping Rubber ◽  
Isolation Systems ◽  
Rubber Bearings

In the present paper the dynamic nonlinear analysis for a 3D base isolated structure is illustrated. A base isolated reinforced concrete building is designed and verified according to the European seismic codes such that the superstructure remains almost completely elastic and the nonlinear elements are localized only in the base isolation system. Nonlinear hysteretic models have been adopted to reproduce the cyclic behavior of the isolators. Two different base isolation systems are considered and their performances are compared for evaluating the behaviour of a base isolated building, highly irregular in plan, in presence of a seismic excitation defined with recorded accelerograms which characterize the bi-directional ground motions. The isolation system has been realized with a combination in parallel of elastomeric bearings and sliding devices. In the first analyzed isolation system we have used the High Damping Rubber Bearings (HDRB) and in the second analyzed isolation system we have used the Lead Rubber Bearings (LRB). Finally a comparative analysis between the base isolated structure with hybrid base isolation systems and the conventional fixed base structure is detailed.

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