地震动速度脉冲对减隔震连续梁桥纵向地震响应的影响
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摘要
本文分别选取台湾集集和Imperial Valley地震中有、无速度脉冲效应的两类实际地震记录作为地震动输入,基于一座实际连续梁桥,通过SAP2000软件建立有限元分析模型,以铅芯橡胶支座、拉索减震支座为研究对象,以非减震体系为对比,系统考察了速度脉冲对减隔震连续梁桥纵向地震响应的影响。结果表明:速度脉冲对非减震以及减隔震连续梁桥的纵向地震响应均有放大作用;在速度脉冲作用下,与非减震桥梁结构相比,虽然铅芯橡胶支座能较大程度减小地震内力响应,但支座变形能力无法满足变形需求,而拉索减震支座在实现减小桥梁地震内力响应的同时仍具有较好的限位能力,重视力与位移之间的平衡,具有较好的减隔震效果。
Three pulse-like and three non-pulse-like near-fault ground motions used as input waves are selected from Taiwan Chi-Chi and Imperial Valley earthquake records. A continuous beam bridge is selected as background to build finite element models by SAP2000. Compared with non-seismic isolated bridge,leader rubber bearing( LRB) and cable-sliding friction aseismic bearing( CSFAB) are selected as research objects to comprehensively inspect the seismic response of seismic isolated bridge using the two bearings. The result shows that the velocity pulse effect would magnify the longitudinal seismic response of both non-seismic isolated and seismic isolated bridge. When under velocity pulse,compared with non-seismic isolated bridge,although the LRB can achieve high isolated rate,the ability to deform cannot satisfy the need of deformation. CSFAB can both reduce the internal force and show good performance on restricting the displacement,valuing the balance between internal force and displacement,representing excellent isolation effect.
Three pulse-like and three non-pulse-like near-fault ground motions used as input waves are selected from Taiwan Chi-Chi and Imperial Valley earthquake records. A continuous beam bridge is selected as background to build finite element models by SAP2000. Compared with non-seismic isolated bridge,leader rubber bearing( LRB) and cable-sliding friction aseismic bearing( CSFAB) are selected as research objects to comprehensively inspect the seismic response of seismic isolated bridge using the two bearings. The result shows that the velocity pulse effect would magnify the longitudinal seismic response of both non-seismic isolated and seismic isolated bridge. When under velocity pulse,compared with non-seismic isolated bridge,although the LRB can achieve high isolated rate,the ability to deform cannot satisfy the need of deformation. CSFAB can both reduce the internal force and show good performance on restricting the displacement,valuing the balance between internal force and displacement,representing excellent isolation effect.
引文
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[3]Buckle I G,Mayes R L.Seismic isolation:History,application,and performance—a world view[J].Earthquake Spectra,1990,6(2):161-201.
[4]倪永军,朱晞.近断层地震的加速度峰值比和反应谱分析[J].北京交通大学学报,2004,28(4):1-5.
[5]李爽,谢礼立.近场脉冲型地震动对钢筋混凝土框架结构影响[J].沈阳建筑大学学报(自然科学版),2006,22(3):406-410.
[6]孙颖,陈天海,卓卫东,等.长周期地震动作用下隔震连续梁桥地震反应特性研究[J].工程力学,2016,33(s1):244-250.
[7]叶鑫,李雪红,徐秀丽,等.近场长周期地震动对减隔震连续梁桥的地震响应的影响研究[J].公路工程,2014,39(1):135-139.
[8]袁万城,王斌斌.拉索减震支座的抗震性能分析[J].同济大学学报(自然科学版),2011,39(8):1126-1131.
[9]袁万城,李涵,田圣泽,等.桥梁拉索减震支座研发及应用[J].结构工程师,2015,31(6):86-90.
[10]黄石.考虑温度作用效应的长联多跨桥梁抗震设计[D].上海:同济大学,2015.
[11]Liao W I,Loh C H,Wan S.Earthquake responses of RC moment frames subjected to near-fault ground motions[J].The Structural Design of Tall and Special Buildings,2001,10(3):219-229.
[12]Baker J W.Quantitative classification of near-fault ground motions using wavelet analysis[J].Bulletin of the Seismological Society of America,2007,97(5):1486-1501.
[13]王江波,贺金海,袁万城.近场地震作用下采用拉索减震支座桥梁纵向地震响应特性[J].结构工程师,2012,28(5):82-88.