橋梁功能性支承系統耐震性能設計與評估補強方法之研究─總計畫暨子計畫：位移設計法於含功能性支承橋樑耐震性能設計方法之研究(I)
Date Issued
2005
Date
2005
Author(s)
DOI
932625Z002025
Abstract
Investigations on the 1999 Taiwan Chi-Chi earthquake indicate that most of the
bridge columns experienced none to-minor damages except for those bridges
directly crossed by the ruptured faults. Studies show that the functions of the
bearing system, including non-bolted rubber bearings, shear keys and restrainers,
plays an important role for the performance of the bridges during the earthquake.
One of the reason for this unexpected performance is the way of bridge bearing
construction in Taiwan. This paper aims at understanding the effect of bridge
bearing systems and providing a simplified method to estimate the maximum
displacement demand. Experimental studies on friction coefficients of rubber
bearing on non-shrink cement mortar or concrete surface were first carried out. A
SDOF bridge system with rubber bearings were also studied under pseudodynamic
tests and verified by a numerical model. Test results show that, in a
quasi-static state, the friction coefficient of rubber bearing is about 0.2 on three
different contact surfaces. The numerical model is adequate to obtain the global
displacement demand when the rubber bearing is simulated by a frictionpendulum
element with 15-20% reduced shear stiffness during large shear
deformation. Based on the experimental results, this study proposes a simplified
ATC-40 method considering the equivalent friction damping to determine
performance point. The numerical result of a SDOF bridge predicts the maximum
displacement of the bridge deck well when compared with the mean value from
14 nonlinear time-history dynamic analyses. Results of this study help to
understand the damage that may occur to the rubber bearings and bridges columns
under major earthquake ground motions.
Publisher
臺北市：國立臺灣大學土木工程學系暨研究所
Type
report
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