GA混凝土高温粘弹变形的非线性本构模型  

Nonlinear constititive model research of Guss Asphalt Concrete High Temperature Viscolastic Deformation Based on Dynamic Penetration Test

作　　者：张顺先[1] 张肖宁[1] 魏建明[2] 刘福胜[1] 张吉庆[1] 

机构地区：[1]华南理工大学土木交通学院,广东广州510640 [2]重庆交通大学土木建筑学院,重庆410621

出　　处：《重庆大学学报（自然科学版）》2013年第2期91-95,101,共6页Journal of Chongqing University

基　　金：国家重大科技支撑计划资助项目(2011BAG07B03);国家自然科学基金资助项目(51038004)

摘　　要：采用改进的Burgers模型推导出GA混凝土高温变形性能的粘弹性本构模型,并通过动态贯入度试验(DPT)回归改进的Burgers模型参数及其验证模型的适用性和可靠性。研究结果表明,该模型从本质上揭示模型参数和试验参数对GA高温变形的影响规律,可以有效地预测GA高温条件下永久变形的变化规律;采用DPT能较准确地反映GA混凝土在车辆荷载作用下的实际受力状况,较现有的评价方法有实质性改进;通过在50℃和60℃条件下的DPT试验可知,GA混凝土的高温变形性能对加载时间、温度较敏感,随着荷载作用时间延长和外界环境温度的升高,其变形速率和永久变形量也随着增大。We get the viscoelastic constitutive model of high temperature deformation property about Guss Asphalt （GA） concrete used on the improved Burgers model,through Dynamic Penetration Test （DPT） to regress improved Burgers model parameters,verify model＇s applicability and reliability . The result shows that this model can reveal influent rule of model parameters and experimental parameters on high- temperature deformation of GA, also can predict the permanent deformation variation effectively under high temperature, DPT used can reflect the GA actual stress condition under the vehicle load more accurately, the high temperature deformation property of GA is sensitive to load time and temperature by DPT test under 50℃ and 60℃, the deformation rate and permanent deformation are increasing with load time extension and external environment temperature increased.

关 键 词：GA混凝土 粘弹性本构模型 高温变形 动态贯入度(DPT) 

分 类 号：U414.03[交通运输工程—道路与铁道工程]