摘要
泊松比是粘弹性材料力学本构模型的基本输入参数,同时也是有限元分析必须输入的参数。对于粘弹性材料而言,沥青混合料在荷载作用下的变形包含弹性的储能模式部分,还包括由于材料的内粘滞作用造成的耗能模式部分,因此,假设沥青混合料的泊松比为常量显然是不合理的。基于间接拉伸动态模量试验表明:沥青混合料的泊松比在不同的温度与加载频率下是不同的。运用Gauss-Newton迭代法对AASHTO泊松比预估模型进行了修正,并运用最小二乘法构建一个新的泊松比预估模型,验证试验表明新预估模型较修正的AASHTO模型预估效果更好。
Poisson＇s ratio is the basic input parameter of the constitutive model of viscoelastic material mechanics,and it is also the parameter that must be input in finite element analysis. For viscoelastic materials,in the process of loading,deformation of asphalt mixture includes the elastic energy storage model,including energy consumption model,so it is obviously unreasonable to due to assume that the Poisson＇s ratio of asphalt mixture is constant. Being based on the indirect tensile dynamic modulus test,it has shown that the Poisson＇s ratio of asphalt mixture is different under different temperature and frequency,and it has a good correlation with the dynamic modulus. In the end,the AASHTO Poisson＇s ratio prediction model has been modified and a new prediction models has been proposed. The verification test has shown that the new prediction model has better prediction effect than the modified AASHTO model.
作者
刘涛
唐佑绵
范海琪
刘书君
LIU Tao;TANG Yournian;FAN Haiqi;LIU Shujun(Key Laboratory of Highway Engineering Technology in Arid ＆ Desert Region, Ministry of Transport, Xinjiang Institute of Transportation Science, Urumqi 830000;School of Transportation and Logistics, Xinjiang Agricuhural University, Urumqi 830052;Cuangdong Road and Bridge Construction and Development Company Limited, Cuangzhou 510623)
出处
《广东公路交通》
2018年第2期1-6,共6页
Guangdong Highway Communications
基金
交通部西部交通建设科技项目(2011318797600)
新疆维吾尔自治区交通科技项目(201604)
关键词
道路工程
沥青混合料
间接拉伸
动态模量
泊松比
预估模型
road engineering
asphalt mixture
indirect tension
dynamic modulus
Poisson＇s ratio
prediction model
作者简介
刘涛（1962-），男，新疆乌鲁木齐人，研究员，工学博士，硕士研究生导师，研究方向：道路工程，E—mail：L—ta02000@163．com。
