桥面铺装层脱空区积水冻胀应力特性分析  

Analysis of Frost-heave Stress Characteristic in Void Area ofBridge Deck Pavement

作　　者：董磊 Dong Lei(The 5 Engineering Co.,Ltd.,China Railway 18th Bureau,Beijing 100070,China)

机构地区：[1]中铁十八局集团第五工程有限公司,北京100070

出　　处：《市政技术》2020年第6期59-62,共4页Journal of Municipal Technology

摘　　要：为研究冻胀作用导致桥面铺装层的破坏规律,应用有限元软件ABAQUS研究了铺装层内不同长度的脱空区积水结冰后的力学响应特征。结果表明:脱空区的冻胀使得桥面表面产生水平拉应力,且最大值随脱空区长度的增加而先增加后减小,当脱空区长度为16 cm时桥面表面水平拉应力达到最大值为5.36 MPa;脱空区正上方的应力较复杂,随脱空区冻胀尺寸的增大,桥面表面的水平拉应力先增加后减小,而桥面底面(脱空区上部)先出现了拉应力后出现了压应力;铺装层表面的竖向位移随脱空区冻胀尺寸的增大而增大;冻胀使得脱空区的尖端产生应力集中现象,当脱空区长度为8 cm时应力集中最严重,此时的竖向拉应力值达到最大为10.7 MPa,易使层间脱离。This paper analyzes the destructive law of frost-heave action to the bridge deck pavement.After road water frozen,a finite element software ABAQUS was used to discover its mechanical characteristic in void areas of different lengths.Results show that the bridge surface emerged horizontal tensile stress because of the void areas’frost-heave.Firstly,the horizontal tensile stresses increased with increasing void area length,then decreases.It reached its maximum 5.36 MPa when void area length is 16 cm.The stress above the void area is complicated:with increasing size of void area,the bridge surface horizontal tensile stress increased firstly,then decreased.The tensile stress followed by pressure stress under the bridge surface(the void area above).Vertical displacement of the pavement surfaces increased with the frost-heave’s in void area.The tip of void area emerged stress concentration.When the void area length was 8 cm,came the most stress concentration and the vertical tensile stress reached its maximum value 10.7 MPa which could easily cause interlaminar detachment.

关 键 词：桥梁 桥面铺装 面层脱空 应力分析 数值模拟 冻胀模拟 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]