地震作用下双曲面球型减隔震支座在铁路简支梁桥中的动力行为
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摘要
为研究双曲面球型减隔震支座在铁路简支梁桥中的减隔震效果,采用ABAQUS软件建立8m及25m墩高的铁路简支梁桥有限元模型,进行地震荷载作用下的非线性动力时程分析。通过对有限元计算结果与振动台模型试验结果进行对比,验证有限元模型的正确性。与普通球型钢支座作对比,分析地震作用下双曲面球型减隔震支座的水平滑动位移、竖向位移和竖向荷载变化等动力行为。研究得到双曲面球型减隔震支座在不同地震烈度下的水平滑动位移范围。研究结果表明:相对于普通支座,双曲面球型减隔震支座在大多数情况下,能明显减小顺桥向地震作用造成的简支梁固定端与滑动端之间的竖向相对位移,对轨道结构造成的不利影响更小;双曲面球型支座能显著降低横桥向地震作用造成的支座竖向荷载变化幅值,并有效避免支座滑动面发生脱离碰撞。
To investigate the seismic isolation effect of double spherical seismic isolation(DSSI) bearings in the simply-supported railway bridges, the finite element models(FEM) of those bridges with pier height of 8 m and25 m were established by the ABAQUS software, and were studied by a nonlinear dynamic time-history analysis under earthquakes. Based on the comparison of finite element calculation results and shaking table test results,the correctness of FEM was verified. The dynamic behaviors, including horizontal sliding displacement, vertical displacement and vertical load change of DSSI bearings under earthquakes, were analyzed and compared with the traditional spherical steel bearings. The horizontal sliding displacement range of DSSI bearings under different seismic intensities was obtained. The results show that when compared with the traditional spherical steel bearings, the DSSI bearings can significantly reduce the vertical relative displacement between the fixed end and the sliding end of the simply-supported girder under longitudinal earthquake effects in most cases, and have less detrimental effects on track structure. The DSSI bearings can significantly reduce the amplitude of vertical load of bearing under transverse earthquake effects and can effectively avoid the separation and collision of sliding surface of bearing.
To investigate the seismic isolation effect of double spherical seismic isolation(DSSI) bearings in the simply-supported railway bridges, the finite element models(FEM) of those bridges with pier height of 8 m and25 m were established by the ABAQUS software, and were studied by a nonlinear dynamic time-history analysis under earthquakes. Based on the comparison of finite element calculation results and shaking table test results,the correctness of FEM was verified. The dynamic behaviors, including horizontal sliding displacement, vertical displacement and vertical load change of DSSI bearings under earthquakes, were analyzed and compared with the traditional spherical steel bearings. The horizontal sliding displacement range of DSSI bearings under different seismic intensities was obtained. The results show that when compared with the traditional spherical steel bearings, the DSSI bearings can significantly reduce the vertical relative displacement between the fixed end and the sliding end of the simply-supported girder under longitudinal earthquake effects in most cases, and have less detrimental effects on track structure. The DSSI bearings can significantly reduce the amplitude of vertical load of bearing under transverse earthquake effects and can effectively avoid the separation and collision of sliding surface of bearing.
引文
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[2]Wei B,Yang T H,Jiang L,et al.Effects of friction-based fixed bearings on the seismic vulnerability of a high-speed railway continuous bridge[J].Advances in Structural Engineering,2018,21:643-657
[3]彭天波,李建中,范立础.双曲面球型减隔震支座的开发及应用[J].同济大学学报:自然科学版,2007,35(2):176-180(Peng Tianbo,Li Jianzhong,Fan Lichu.Development and application of double spherical aseismic bearing[J].Journal of Tongji University:Natural Science,2007,35(2):176-180(in Chinese))
[4]彭天波,李建中,范立础.双曲面球型减隔震支座的竖向位移分析[J].同济大学学报:自然科学版,2007,35(9):1181-1185(Peng Tianbo,Li Jianzhong,Fan Lichu.Analysis of vertical displacement of double spherical aseismic bearing[J].Journal of Tongji University:Natural Science,2007,35(9):1181-1185(in Chinese))
[5]顾正伟,钟铁毅,张贞阁.双曲面球型减隔震支座曲线连续梁桥的减隔震[J].中国铁道科学,2011,32(3):47-51(Gu Zhengwei,Zhong Tieyi,Zhang Zhenge.Seismic isolation of curved continuous bridge with double spherical aseismic bearing[J].China Railway Science,2011,32(3):47-51(in Chinese))
[6]刘俊,王合希.双曲面球型减隔震支座在刚构连续梁桥中的应用[J].铁道科学与工程学报,2012,9(3):117-123(Liu Jun,Wang Hexi.Application of double spherical seismic isolation bearing in a rigid frame-continuous girder bridge[J].Journal of Railway Science and Engineering,2012,9(3):117-123(in Chinese))
[7]聂晋涛.客运专线桥梁中减隔震技术应用研究[J].铁道工程学报,2012(3):53-57(Nie Jintao.Research on application of seismic reduction and isolation technology in bridge of passenger dedicated line[J].Journal of Railway Engineering Society,2012(3):53-57(in Chinese))
[8]魏标,李建中.基于位移的非规则梁桥抗震设计[J].土木工程学报,2011,44(8):95-101(Wei Biao,Li Jianzhong.Displacement-based seismic design of irregular continuous bridges[J].China Civil Engineering Journal,2011,44(8):95-101(in Chinese))
[9]魏标,杨添涵,蒋丽忠.轨道结构建模精细化程度对高速铁路连续梁桥地震易损性的影响[J].工程力学,2018,35(4):16-23(Wei Biao,Yang Tianhan,Jiang Lizhong.The effects of model refinement of ballastless tracks on the seismic vulnerability of a continuous bridge on a high-speed railway[J].Engineering Mechanics,2018,35(4):16-23(in Chinese))
[10]Wei B,Yang T,Jiang L,et al.Effects of uncertain characteristic periods of ground motions on seismic vulnerabilities of a continuous track-bridge system of high-speed railway[J].Bulletin of Earthquake Engineering,2018,16(9):3739-3769
[11]庄军生.桥梁支座[M].北京:中国铁道出版社,2015
[12]张永亮,于伟栋,马华军,等.板式无砟轨道系统对不同抗震体系铁路桥梁纵向地震响应的影响[J].中南大学学报:自然科学版,2017,48(10):2738-2744(Zhang Yongliang,Yu Weidong,Ma Huajun,et al.Influence of slab ballastless track on longitudinal seismic response of railway bridge with different seismic systems[J].Journal of Central South University:Science and Technology,2017,48(10):2738-2744(in Chinese))
[13]Wei B,Zuo C,He X,et al.Numerical investigation on scaling a pure friction isolation system for civil structures in shaking table model tests[J].International Journal of Non-Linear Mechanics,2018,98:1-12