陕西省高速公路桥梁疲劳荷载模型  

Fatigue load model of expressway bridges in Shaanxi Province

作　　者：崔磊 姜磊[1] 刘永健[1,2] 熊奕涵 沈振龙 CUI Lei;JIANG Lei;LIU Yongjian;XIONG Yihan;SHEN Zhenlong(School of Highway,Chang’an University,Xi’an,Shaanxi 710064,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]重庆大学土木工程学院,重庆400045

出　　处：《公路交通科技》2025年第4期139-150,178,共13页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(52478125);陕西省留学人员科技活动择优项目(2021-11);中央高校基本科研业务费专项项目(300102213207)。

摘　　要：【目标】车辆荷载作为桥梁承受的主要活载,是准确评估桥梁运营状态的关键,采用现有规范所给的车辆荷载考虑方法,无法准确反映车辆荷载的地域性及时效性。【方法】为精确考虑陕西省车辆荷载地域性及时效性,收集陕西省内包茂、十天、青银、京昆、连霍5条高速公路2011—2023年共计13年交通量数据,对其进行数理统计分析,提出陕西省高速公路桥梁车流量增长模型。收集中国东北、中原、东南沿海地区疲劳荷载谱,根据等效损伤原则建立轴距及轴重分配比例模型,将陕西省实测数据与所建立分配比例模型相结合,建立陕西省高速公路桥梁疲劳荷载谱。同时收集浙江省、贵州省、广西省、山西省等共计10地疲劳荷载谱,依托实际工程建立有限元模型,对各荷载谱代表车型进行影响线加载,引入并求解等效损伤系数对所建立荷载谱进行评估。【结果】连霍高速日均车流量增长率按每年15%考虑。包茂、十天、京昆3条高速日均车流量增长率均按每年10%考虑。青银高速日均车流量增长率按每年5%考虑。【结论】规范标准疲劳车对应等效损伤系数等于1,陕西省疲劳荷载谱对应等效损伤系数等于0.66,对比可知采用规范规定疲劳荷载进行验算会导致结果过于保守。[Objective]Vehicle loads,as the main live loads borne by bridges,are crucial for accurately assessing bridge operational status.The methods for considering vehicle loads,provided in existing specifications,cannot accurately reflect the regional and timeliness characteristics of vehicle loads.[Method]To precisely take into account the regional and timeliness characteristics of vehicle loads in Shaanxi Province,the traffic volume data for total of 13 years from 2011 to 2023 on 5 expressways(i.e.[KG-3],Baotou-Maoming expressway,Shiyan-Tianshui expressway,Qingdao-Yinchuan expressway,Beijing-Kunming expressway,Lianyungang-Huoerguosi expressway)in Shaanxi Province were collected.The data were processed for mathematical statistical analysis.The traffic flow growth model of expressway bridges in Shaanxi Province was put forward.The fatigue load spectra of the northeastern region,central plains region and southeastern coastal region of China were collected.Based on the equivalent damage principle,the models of wheelbase and axle load distribution ratios were established.The measured data in Shaanxi Province were combined with the established distribution ratio models to establish the fatigue load spectra for expressway bridges in Shaanxi Province.Meanwhile,the fatigue load spectra of 10 regions,including Zhejiang Province,Guizhou Province,Guangxi Zhuang Autonomous Region and Shanxi Province,were collected.The finite element models were established relying on actual engineering projects.The influence lines of various load spectra representative vehicles were loaded.The equivalent damage coefficient was introduced and solved to evaluate the established load spectra.[Method]The average daily traffic flow growth rate of Lianyungang-Huoerguosi expressway is considered to be 15%per year.The average daily traffic flow growth rates of Baotou-Maoming expressway,Shiyan-Tianshui expressway,Beijing-Kunming expressway are all considered to be 10%per year.The average daily traffic flow growth rate of Qingdao-Yinchuan expressway is cons

关 键 词：桥梁工程 疲劳荷载谱 交通调查统计 等效损伤系数 车流量增长 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]