摘要
利用ANSYS有限元分析软件建立沥青路面结构有限元分析模型,计算了不同行车速度条件下轮隙中心处和荷载作用面正下方的路表弯沉响应规律,研究弯沉和行车速度的关系;然后考虑不同荷载水平,分析重载条件下的路表弯沉响应。研究表明,沥青路面动态弯沉和静态弯沉之间存在显著差异,移动荷载(车速为30 km/h)作用下路表弯沉为静载作用下路表弯沉的50%左右;随行车速度增加,路表弯沉峰值减小,且峰值出现时间出现滞后;超载60%和140%时,弯沉等效的轴载换算系数分别为0.93和1.03,大于规范给出非标准轴载按弯沉等效的轴载换算系数0.87。
In order to study the influence of vehicle speed on pavement deflection under vehicle load,a finite element model of asphalt pavement structure was developed in ANSYS.The relationship between pavement deflection and vehicle speed was analyzed.Then different axle loads were considered,in order to study the effect of heavy load on pavement deflection.The results show that,pavement deflection under moving load has significant difference with that considering statistic load.When 30 km / h vehicle speed is considered,the pavement deflection is about 50% of that considering statistic load;pavement deflection decreases with the increases in vehicle speed and a hysteresis of the deflection peak value is observed;when 60% and 140% overloads are considered,the axle load exchange coefficients based on deflection equivalent are 0.93 and 1.03,which is greater that specified in the asphalt pavement design guide.
出处
《公路工程》
北大核心
2013年第4期196-198,206,共4页
Highway Engineering
关键词
有限元
移动荷载
弯沉
轴载
finite element
moving load
deflection
axle load
