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| STUDY ON BASE ISOLATION ON THE SEISMIC RESPONSE OF SIMPLY-SUPPORTED BEAM BRIDGE |
| ZHANG Jun，YAN Gui-ping |
| Dept-of Civil Eng，Northern Jiaotong University |
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Abstract In this paper，a nonlinear model for time-step analysis of simply-supported beam bridges subjected to earthquake motions was developed. The focus of the study was on elastomeiic isolations with lead cores. The hysteretic behavior of isolators and the column was taken into account by tiilinear and bilinear model respectively. The nonlinear analysis showed that，contrary to linear theory prediction，the use of isolators does not necessarily increase the displacement of the superstructure. Furthermore，it was showed that properly designed isolators could reduce both the ductility demand and internal force in RC bridge columns substantially.
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Received: 12 October 2000
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[1]范立础，桥梁抗震[M].同济大学出版社.
[2]Billings I J，Kirkcaldie D K. Base isolation of bridges in N ew Zeal an [ C ]. Proceedings US-NZ Workshop on Seismic Resistance of Highway Bridges. 1985.
[3]Mayes R L. Current applications of sesmic base isolation in U. S. bridges [ C ]. Proceedings US-NZ Workshop on Seismic Resistance of Highway Bridges. 1985.
[4]“九五”国家重点科技攻关计划专题.高速铁路线桥结构 与技术条件(标准）的研究报告之十二：高速铁路中小跨 度桥梁桥式合理布置和合理结构的研究[R].北方交通大学土建学院.
[5]Takeda T Nielson N N，Sosen M A. Reinfored Concrete Res p on se to Sim ulated Earth qu ake [ C ]. Pr oc. of ASCE， Dec. 1970，96(st 12): 2557-2573.
[6] Robinson W H. Leadubber hysteretic bearings suitable fo r pro tecting s t ructures duri ng ear th quake [ J ]. Earthquake Eng. Struct. Dyn，1982，（ 10): 593-604.
[7] 李建中，辛学中.连续梁桥减震、隔震体系非线性地震反应分析[J].地震工程与工程振动，1998，（3).
[8] H'v ang J S，Lin Y C. Quasi-static and dynamic hysteresis o f le ad -ru bb er seis mi c i so la ti o n bearings [ J]. J. Chinese Institute of Civil and Hydraulic Engineering， 1998，10 (3): 515-524.
[9] Saiidi M，M a rag aki s E，Gri ff in G. Effect o f b as e is o la ti on on the seismic response of ulutiolumn bridges [ J ]. Structural Enginering and Mechanics，1999，8(4): 411 -419.
[10] Turking ton D H，Carr A J Seismic design of bridges on lead~rubber bearing [J]. J. ASCE，1989，115(12): 3000?3016. |
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2000, Vol. 17 
