摘要
为探究变速车辆对弯梁桥爬移的影响,以典型匝道桥为例,分析车辆因素对弯梁桥爬移现象的影响。采用有限元软件ANSYS建立主梁实体模型和双线性弹簧支座模型,形成弯桥整体有限元模型。将该模型与MIDAS/Civil模型进行对比,以验证计算模型的有效性。随后将移动车辆转化为叠加时变径向离心力的竖向荷载,并基于形函数编制荷载文件等效作用于弯梁桥模型。最后进行弯桥爬移的车辆因素分析,分析车辆入桥初速度、车辆加(减)速度、车重等因素对弯梁桥爬移的影响。结果表明,弯梁桥关键截面横向位移随着径向作用力位置的靠近和远离呈先增大后减小的趋势;车辆入桥初速度越大、车重越大,主梁横向位移、跨中截面竖向位移、外侧支座竖向反力及内外侧支座横向反力越大;车辆入桥初速度增大,内侧支座竖向反力减小;车辆减速度(绝对值)越大,主梁横向位移越小,对跨中截面竖向位移及支座反力无影响;车辆入桥初速度及车重是影响弯梁桥爬移的主要因素,车辆减速度变化为次要因素。
To investigate the impact of variable-speed vehicles on the creep of curved girder bridges,a typical ramp bridge was selected as a case study to analyze the influence of vehicle-related factors on this phenomenon.A finite element model of the curved bridge was developed using ANSYS,incorporating a solid main girder model and bilinear spring bearings.The validity of the computational model was verified through comparison with a MIDAS/Civil model.Moving vehicle loads were equivalently transformed into vertical loads superimposed with time-varying radial centrifugal forces.These loads were applied to the curved bridge model using shape functions to generate load files.Subsequently,vehicle-related factors affecting lateral displacement—including initial entry speed,acceleration/deceleration,and vehicle weight—were systematically analyzed.Results indicate that the lateral displacement at key bridge sections initially increases and then decreases as the radial force approaches and moves away from the key sections.Higher initial vehicle entry speeds and greater vehicle weights lead to increased lateral displacement of the main girder,vertical displacement at mid-span sections,vertical reaction forces of outer bearings,and transverse reaction forces of both inner and outer bearings.Conversely,higher initial entry speeds reduce vertical reaction forces of inner bearings.Larger deceleration magnitudes(absolute values)reduce lateral displacement but exhibit negligible effects on mid-span vertical displacement and bearing reactions.Vehicle entry speed and weight are identified as primary influencing factors for lateral displacement,while deceleration plays a secondary role.
作者
刘焕举
张荣
刘宁
LIU Huanju;ZHANG Rong;LIU Ning(School of Civil Engineering,Hebei University of Engineering,Handan,Hebei 056038,China;School of Science and Technology,Woosuk University,Jeonju 565-701,Korea)
出处
《河北工程大学学报(自然科学版)》
2025年第4期70-76,90,共8页
Journal of Hebei University of Engineering(Natural Science Edition)
基金
河北省高等学校科学技术研究项目青年拔尖人才项目(BJ2020012)
国家自然科学基金资助项目(51908178)
陕西省自然科学基金资助项目(2020JM-230)。
关键词
弯梁桥
有限元
变速
移动荷载
爬移
curved beam bridge
finite element
deceleration
moving load
creep
