斜拱肋倾角变化对斜靠式拱桥地震响应的影响
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摘要
以某钢管混凝土斜靠式拱桥为例,建立了空间杆系有限元计算模型,研究了斜靠式拱桥斜拱肋倾角变化对拱桥基频、地震内力和位移响应的影响.研究结果表明:随着斜拱肋倾角的增大,斜靠式拱桥的侧向刚度显著提高、主拱肋和斜拱肋在横桥向地震作用下的轴力和面内弯矩均有不同程度的减小;而在纵桥向地震作用下,斜拱肋倾角变化对主拱肋的轴力和面内弯矩影响较小.
Take certain concrete-filled steel tube leaning-type arch bridge as an example,a three dimension finite element model with beam element is established in this paper.The influence of variation of incline angle of inclined arch rib on fundamental frequency,seismic internal force and displacement of the bridge is studied.A series of results can be obtained from this study: ①The lateral stiffness of arch bridge could improve obviously with the increase of inclined angle for arch rib;②Both the axial force and in-plane bending moment of main and inclined arch ribs would decrease with the increased inclined angle of arch rib under transverse seismic excitation.However,less effect of such variations on axial force and in-plane bending moment of main arch rib is found when the bridge is under longitudinal seismic excitation.
Take certain concrete-filled steel tube leaning-type arch bridge as an example,a three dimension finite element model with beam element is established in this paper.The influence of variation of incline angle of inclined arch rib on fundamental frequency,seismic internal force and displacement of the bridge is studied.A series of results can be obtained from this study: ①The lateral stiffness of arch bridge could improve obviously with the increase of inclined angle for arch rib;②Both the axial force and in-plane bending moment of main and inclined arch ribs would decrease with the increased inclined angle of arch rib under transverse seismic excitation.However,less effect of such variations on axial force and in-plane bending moment of main arch rib is found when the bridge is under longitudinal seismic excitation.
引文
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[2]肖汝诚,孙海涛,贾丽君,等.昆山玉峰桥-首座大跨度无推力斜靠式拱桥的设计研究[J].土木工程学报,2005,38(1):78-83.
[3]邱文亮,黄财良,邓安泰.钢管混凝土倾角对拱肋稳定性影响的研究[J].公路交通科技,2004,21(4):53-55.
[4]陈淮,孙应桃.斜靠式拱桥拱肋倾角变化对稳定性能的影响[J].铁道科学与工程学报,2009,6(1):21-24.
[5]陈淮,王艳,董建华,等.康富钢管混凝土拱桥振动特性分析[J].世界地震工程,2003,19(4):51-56.
[6]陈淮,朱倩,李静斌,等.结构参数变化对斜靠式拱桥动力特性的影响[J].中国公路学报,2009,22(1):47-52.
[7]李静斌,葛素娟,陈淮.5跨连续中承式钢管混凝土拱桥抗震性能分析[J].世界地震工程,2005,21(3):110-115.
[2]肖汝诚,孙海涛,贾丽君,等.昆山玉峰桥-首座大跨度无推力斜靠式拱桥的设计研究[J].土木工程学报,2005,38(1):78-83.
[3]邱文亮,黄财良,邓安泰.钢管混凝土倾角对拱肋稳定性影响的研究[J].公路交通科技,2004,21(4):53-55.
[4]陈淮,孙应桃.斜靠式拱桥拱肋倾角变化对稳定性能的影响[J].铁道科学与工程学报,2009,6(1):21-24.
[5]陈淮,王艳,董建华,等.康富钢管混凝土拱桥振动特性分析[J].世界地震工程,2003,19(4):51-56.
[6]陈淮,朱倩,李静斌,等.结构参数变化对斜靠式拱桥动力特性的影响[J].中国公路学报,2009,22(1):47-52.
[7]李静斌,葛素娟,陈淮.5跨连续中承式钢管混凝土拱桥抗震性能分析[J].世界地震工程,2005,21(3):110-115.
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