混凝土路面传力杆界面应力分析  

Stresses at interfaces between dowels and surrounding concrete

作　　者：李侠[1,2] 

机构地区：[1]西安财经学院管理学院,陕西西安710061 [2]长安大学环工学院,陕西西安710054

出　　处：《四川建筑科学研究》2012年第4期189-193,共5页Sichuan Building Science

基　　金：高等学校博士点科研基金项目(20090205120008)

摘　　要：为了研究混凝土路面传力杆处应力分布规律及接缝传荷能力,建立水泥混凝土横向接缝三维有限元模型,对不同面板厚度、不同传力杆直径工况下的应力分布规律及传力杆松动对接缝传荷能力影响进行分析。研究结果表明:界面混凝土最大主拉应力随面板厚度的增加而降低,最大剪应力随面板厚度增加呈现先增大后减小趋势,界面混凝土最大主拉应力和最大剪应力随传力杆直径的增加均呈现先增大后减小的趋势;传力杆松动情形下,最大主拉应力和最大剪应力变化幅度较小,但接缝传荷能力下降明显,松动间隙由2 cm增大到6 cm时,传荷系数由93.2%降低到76.1%。A detailed three-dimensional finite element model was used to investigate the distribution rule of stresses at interfaces between dowels and surrounding concrete under different thickness of cement concrete pavement and different dowel＇s diameter and load transfer efficiency under different panel thickness, dowel＇s loosened quantity. The results indicate that concrete＇s maximum principal tensile stress at interfaces decrease, that maximum shearing stress increase first and then decrease when panel thickness increases; concrete＇s maximum principal tensile stress and maximum shearing stress at interfaces increase first and then decrease when dowers diameter increases. In case of loosened quantity, the maximum principal tensile stress and maximum shear stress changed little ,but load transfer efficiency decreased significantly. Load transfer efficiency decreases from 93.2% down to 76. 1% when loosened quantity increases from 2 cm to 6 cm.

关 键 词：传力杆接缝 有限元分析 松动间隙 界面混凝土应力 接缝传荷能力 

分 类 号：TU528.1[建筑科学—建筑技术科学]