\r朱劲松^{1, 2}，香 超¹，祁海东\r³\r
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AuthorsHTML:\r朱劲松^{1, 2}，香 超¹，祁海东\r³\r
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AuthorsListE:\rZhu Jinsong^{1, 2}，Xiang Chao¹，Qi Haidong\r³\r
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AuthorsHTMLE:\rZhu Jinsong^{1, 2}，Xiang Chao¹，Qi Haidong\r³\r
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Unit:\r1. 天津大学建筑工程学院，天津 300072；
2. 滨海土木工程结构与安全教育部重点实验室(天津大学)，天津 300072；
3. 怀来县市政建设管理处，怀来 075400\r
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Unit_EngLish:\r1. School of Civil Engineering，Tianjin University，Tianjin 300072，China；
2. Key Laboratory of Coast Civil Structure Safety(Tianjin University)，Ministry of Education，Tianjin 300072，China；
3. Municipal Construction Administration Department of Huailai，Huailai 075400，China\r
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Abstract_Chinese:\r考虑移动车辆荷载对桥梁结构的冲击力是公路桥梁结构设计的重要内容之一．为研究大跨度公路悬索桥各构件冲击作用的影响因素及其敏感性，以官厅水库特大桥主桥为依托进行分析．基于车桥耦合振动原理，采用三轴11 自由度车辆模型，分析了车速、桥面不平顺度、车重及横向加载位置对桥梁各构件冲击系数的影响．分析成果表明，桥面不平顺度对桥梁各构件冲击系数有显著影响；车速对冲击系数的影响主要与桥梁各构件的卓越振动频率有关，车速增大并不一定导致冲击系数增大；车重持续增加使冲击系数减小且减幅逐渐降低；横向加载位置的不同对各纵梁横桥向挠度冲击系数的影响有明显区别，随着汽车加载位置的靠近，各纵梁的挠度冲击系数逐渐减小；影响因素的敏感性排序为：桥面不平顺度＞车速＞横向加载位置＞车重．\r
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Abstract_English:\rThe impact force of a loaded moving vehicle on the structure of a highway bridge needs to be considered during structural design. The Guanting reservoir bridge is analyzed to determine the influencing factors of the impact coefficients of long-span highway suspension bridge components and their sensitivities. On the basis of the vehiclebridge coupled vibration principle，the influences of vehicle speed，bridge surface roughness，vehicle weight，and transverse loading position on the impact coefficient of each bridge component were analyzed using the 11 DOFs spatial vehicle model. The analysis results show that the roughness of the bridge has a significant influence on the impact coefficient of each component. The influence of speed on the impact coefficient is mainly related to the excellent vibration frequency of bridge components，and the increase in the speed of the vehicle does not necessarily lead to the increase in the impact coefficient. The increase in the vehicle weight leads to the gradual decrease in the impact coefficient. The effect of different lateral loading positions on the impact coefficient of the deflection of each beam in transverse direction is obviously different. The impact coefficient of deflection of each beam decreases as the vehicle’s loading position. The sensitivity of the influencing factors is in the following order：bridge surface roughness＞vehicle speed＞lateral loading＞vehicle weight.\r
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Keyword_Chinese:冲击系数；悬索桥；车桥耦合振动；影响因素；敏感性\r

Keywords_English:impact coefficient；suspension bridge；vehicle-bridge coupled vibration；influencing factor；sensitivity\r


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