自锚式斜拉-悬吊协作体系桥动力分析
|
摘要
自锚式斜拉-悬吊协作体系桥是一种新近出现的国内外研究尚少的桥型.以大连港航道桥设计方案为背景,利用空间有限元模型通过与地锚式桥的动力特性对比分析,得出大跨径自锚式斜拉-悬吊协作体系桥具有主梁竖向弯曲振型总是优先出现等新的动力特点;针对主跨主缆易于振动的特征提出了采用斜向交叉拉索的抑振措施,并给出其最优设置位置为0.287 5跨度处;利用反应谱方法对该桥型的动力性能初步匡算表明,该新型体系桥的地震响应较大,其抗震设计应引起足够的重视.
Self-anchored cable-stayed suspension bridge,as a new type of bridge,is rarely investigated.Based on spatial finite element model,dynamic characteristics of the Dalian Harbor′s sea-route bridge belonging to long span self-anchored cable-stayed suspension bridge are obtained and some new dynamic traits such as preferential appearance of the vertical bending modes for girder are shown in comparison with those of earth-anchored cable-stayed suspension bridge.The vibration-restraining measure setting intersecting inclined cables is proposed because the main cables in the main span are subject to vibration and the most reasonable setting position,which is 0.287 5 position of the main span,is given.The dynamic property is preliminarily analyzed with response spectrum method and the results show that the seismic responses of the kind of bridge are greater so that the anti-seismic design should be paid more attention to.
Self-anchored cable-stayed suspension bridge,as a new type of bridge,is rarely investigated.Based on spatial finite element model,dynamic characteristics of the Dalian Harbor′s sea-route bridge belonging to long span self-anchored cable-stayed suspension bridge are obtained and some new dynamic traits such as preferential appearance of the vertical bending modes for girder are shown in comparison with those of earth-anchored cable-stayed suspension bridge.The vibration-restraining measure setting intersecting inclined cables is proposed because the main cables in the main span are subject to vibration and the most reasonable setting position,which is 0.287 5 position of the main span,is given.The dynamic property is preliminarily analyzed with response spectrum method and the results show that the seismic responses of the kind of bridge are greater so that the anti-seismic design should be paid more attention to.
引文
[1]肖汝城,贾丽君,薛二乐,等.斜拉-悬吊协作体系桥的设计探索[J].土木工程学报,2000,33(5):46-51
[2]杨光华,蔡义前.乌江吊拉组合索桥——一种新的桥型及施工方法[J].公路,2001,3(3):1-6
[3]肖汝城,项海帆.斜拉-悬吊协作体系桥力学特性及其经济性能研究[J].中国公路学报,1999,12(3):43-48
[4]张启伟,冯敏补韦.自锚式混凝土悬索桥的动力分析[J].同济大学学报,2004,12:1562-1566
[5]刘春城,张哲,石磊.自锚式悬索桥的纵向地震反应研究[J].武汉理工大学学报,2002,26(5):607-610
[6]MIYAZAKI M,YAMADA H.Stay-cable systemsof long span suspension bridges for coupled flutter[C]∥Proceedings of 2nd European and AfricanConference on Wind Engineering.Genoa:ServiziGrafici Editoriali,1997:1529-1536
[7]YONEDA M,OHNO K,NAKAZAKI S.Effects ofasymmetrically added temporary mass on thewindward side of the deck on the compound flutterspeed of an ultra long span suspension bridge[J].JStruct Eng,JSCE,1996,42A7:535-546
[8]范立础.桥梁抗震[M].上海:同济大学出版社,1997
[9]杨玉民,袁万城,范立础.上海地区地震动及场地效应对桥梁抗震的影响[J].同济大学学报,2000,28(3):348-352
[2]杨光华,蔡义前.乌江吊拉组合索桥——一种新的桥型及施工方法[J].公路,2001,3(3):1-6
[3]肖汝城,项海帆.斜拉-悬吊协作体系桥力学特性及其经济性能研究[J].中国公路学报,1999,12(3):43-48
[4]张启伟,冯敏补韦.自锚式混凝土悬索桥的动力分析[J].同济大学学报,2004,12:1562-1566
[5]刘春城,张哲,石磊.自锚式悬索桥的纵向地震反应研究[J].武汉理工大学学报,2002,26(5):607-610
[6]MIYAZAKI M,YAMADA H.Stay-cable systemsof long span suspension bridges for coupled flutter[C]∥Proceedings of 2nd European and AfricanConference on Wind Engineering.Genoa:ServiziGrafici Editoriali,1997:1529-1536
[7]YONEDA M,OHNO K,NAKAZAKI S.Effects ofasymmetrically added temporary mass on thewindward side of the deck on the compound flutterspeed of an ultra long span suspension bridge[J].JStruct Eng,JSCE,1996,42A7:535-546
[8]范立础.桥梁抗震[M].上海:同济大学出版社,1997
[9]杨玉民,袁万城,范立础.上海地区地震动及场地效应对桥梁抗震的影响[J].同济大学学报,2000,28(3):348-352
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心