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大跨度公铁两用斜拉-悬索协作体系桥断索动力响应

Dynamic response of cable fracture of long span road-rail cable-stayed suspension bridge

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研究大跨度公铁两用斜拉-悬索协作体系桥在极端作用下发生断索时桥梁结构及桥上列车的动力响应,以G3 铜陵长江公铁大桥为研究对象,建立全桥有限元模型;研究各个位置斜拉索、吊索断裂后桥梁结构的动力响应;研究在列车-桥梁耦合振动作用下,各断索组合工况中桥梁及列车的动力响应.结果表明:斜拉-悬索协作体系桥具有较高的结构刚度及安全冗余;在单根斜拉索、吊索断索后,可保持列车通行;在吊索区域单侧发生 4 根以上断索,可导致连续断索破坏;在斜拉索-吊索交替及斜拉索区域,单侧断索达到 8 根也不会发生连续断索破坏;断索动力放大系数取 2.0 合理,但仅对断索位置附近剩余吊索和斜拉索具有工程应用价值;当断索发生时,若列车经过,列车竖向加速度会发生突变,但仍在安全范围内;剩余斜拉索与吊索动应力增加主要来自于主梁作用,列车作用占比不超过 13%.
Taking the G3 Tongling road-rail bridge as the research object,a finite element calculation model of bridge was established,in order to investigate the dynamic response of the bridge structure and the train on the bridge when the cables were fracturing under extreme action in long span road-rail cable-stayed suspension bridge.Firstly,the dynamic response of the bridge structure after stayed cables or suspender cable fracture was studied.Then,the dynamic response of the bridge and the train under the cable fracture conditions of the train-bridge coupling vibration was studied.Results showed that the cable-stayed suspension bridge had high structural stiffness and safety redundancy.After a single stayed cable or suspender cable fractured,the train could be maintained.Continuous cable fracture might occur when more than four cables were fracturing in one side of the suspender cables area of the bridge.Continuous cable fracture would not occur when eight cables were fracturing in one side of the stayed and suspender cables alternating region and the stayed cables region.Setting the dynamic amplification factor of cable fracture equal to 2.0 was reasonable,but they had engineering application value only for the remaining suspender cables and stayed cables near the fracture cables.When the cable was fracturing,if the train was passing by,the vertical acceleration of the train would change abruptly,but the acceleration was within the safe range.The stress increase of residual stayed cables and suspender cables was mainly due to the action of main girder,and the proportion of train action was less than 13%.

cable-stayed suspension bridgefinite element methodcable fracturedynamic responsetrain-bridge coupled vibration

张兴标、王涛、姚森、叶华文、王路、白伦华

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西南科技大学土木工程与建筑学院,四川绵阳 621010

中铁大桥局集团有限公司,湖北武汉 430050

西南交通大学土木工程学院,四川成都 610031

佛山大学交通与土木建筑学院,广东佛山 528225

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斜拉-悬索协作体系桥 有限元方法 断索 动力响应 列车-桥梁耦合振动

国家自然科学基金资助项目国家自然科学基金资助项目四川省自然科学基金资助项目西南科技大学自然科学基金资助项目

51708468522782192023NSFSC089120zx7125

2024

10.3785/j.issn.1008-973X.2024.09.012

浙江大学学报(工学版)
浙江大学

浙江大学学报(工学版)

CSTPCD北大核心
影响因子：0.625
ISSN：1008-973X
年,卷(期)：2024.58(9)
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