Optimum friction pendulum system for near-fault motions

The friction pendulum system (FPS), a type of base isolation technology, has been recognized as a very efficient tool for controlling the seismic response of a structure during an earthquake. However, previous studies have focused mainly on the seismic behavior of base-isolated structures far from active earthquake faults. In recent years, there have been significant studies on the efficiency of the base isolator when subjected to near-fault ground motions. It is suggested from these studies that the long-duration pulse of near-fault ground motions results in significant response of a base-isolated structure. In view of this, an advanced base isolator called the variable curvature friction pendulum system (VCFPS) is proposed in this study. The radius of the curvature of VCFPS is lengthened with an increasing of the isolator displacement. Therefore, the fundamental period of the base-isolated structure can be shifted further away from the predominant period of near-fault ground motions. Finite element formulations for VCFPS have also been proposed in this study. The numerical results show that the base shear force and story drift of the superstructure during near-fault ground motion can be controlled within a desirable range with the installation of VCFPS. Therefore, the VCFPS can be adopted for upgrading the seismic resistance of the structures adjacent to an active fault.

Download Full-text

Influence of the bilateral coupled effect of the bearing on the seismic response of the structure isolated by friction pendulum system

2010 International Conference on Mechanic Automation and Control Engineering ◽

10.1109/mace.2010.5535307 ◽

2010 ◽

Author(s):

Wang Jian-qiang ◽

Zhao Jun ◽

Ding Yong-gang

Keyword(s):

Seismic Response ◽

Pendulum System ◽

Coupled Effect ◽

Friction Pendulum ◽

Friction Pendulum System

Download Full-text

Component and shaking table tests for full-scale multiple friction pendulum system

Earthquake Engineering & Structural Dynamics ◽

10.1002/eqe.598 ◽

2006 ◽

Vol 35 (13) ◽

pp. 1653-1675 ◽

Cited By ~ 43

Author(s):

C. S. Tsai ◽

Wen-Shin Chen ◽

Tsu-Cheng Chiang ◽

Bo-Jen Chen

Keyword(s):

Full Scale ◽

Shaking Table ◽

Shaking Table Tests ◽

Pendulum System ◽

Friction Pendulum ◽

Friction Pendulum System

Download Full-text

A comparative study of base isolation devices in light rail transit structure featured with lead rubber bearing and friction pendulum system

MATEC Web of Conferences ◽

10.1051/matecconf/201819502013 ◽

2018 ◽

Vol 195 ◽

pp. 02013

Author(s):

Santi Nuraini ◽

Asdam Tambusay ◽

Priyo Suprobo

Keyword(s):

Seismic Isolation ◽

Time History ◽

Light Rail ◽

Rail Transit ◽

Light Rail Transit ◽

Pendulum System ◽

Rubber Bearing ◽

Lead Rubber Bearing ◽

Friction Pendulum ◽

Friction Pendulum System

Advanced nonlinear analysis in light rail transit (LRT) structures has been undertaken to examine the influence of seismic isolation devices for reducing seismic demand. The study employed the use of two types of commercially available bearings, namely lead rubber bearing (LRB) and friction pendulum system (FPS). Six LRT structures, designed to be built in Surabaya, were modelled using computer-aided software SAP2000, where each of the three structures consisted of three types of LRB and FPS placed onto the pier cap to support the horizontal upper-structural member. Nonlinear static pushover and dynamic time history analysis with seven improved ground motion data was performed to gain improved insights on the behavioural response of LRT structures, allowing one to fully understand the supremacy of seismic isolations for protecting the structure against seismic actions. It is shown that both devices manage to isolate seismic forces, resulting in alleviation of excessive base shear occurring at the column. In addition, it is noticeable that the overall responses of LRB and FPS shows marginal discrepancies, suggesting both devices are interchangeable to be used for LRT-like structures.

Download Full-text