【摘要】 应用ABAQUS有限元软件建立了路桥过渡段地基、路堤与路面动力计算的三维模型。交通荷载表达为反复移动的作用于路面局部区域的均布荷载(移动荷载)形式,并编制为VDLOAD子程序。通过ABAQUS有限元standard与explicit计算模块,分析了车速90 km/h、阻尼比5%、胎压700 kPa条件下单次与多次循环荷载作用下过渡路段动应力、位移与裂纹发展的变化规律。分析认为,随着开放交通后道路使用时间的增长,路桥过渡段差异沉降的累计将导致裂纹贯穿整个路面结构层,道面损坏程度加剧,致使道路服务性水平进一步下降,从而影响道路的正常使用。更多还原

【Abstract】 A 3D finite element model has been presented to investigate the dynamic response of transition zone between the bridge and highway.The traffic load is regarded as a periodically moving load and has been implemented into ABAQUS code as a user subroutine VDLOAD.The dynamic stress,displacement and pavement cracking in transition zone under one cycle or some cycles are closely studied by using ABAQUS standard and explicit module.It can be concluded that the accumulation of the bridge-approach settlement makes pavement cracking under traffic loading;and the pavement will fracture completely as the cracking runs through the pavement structure.So,the service level of highway will be degraded again.更多还原