基于大比尺模型试验的连续配筋混凝土路面开裂研究  

Cracking of continuously reinforced concrete pavement based on large-scale model test

作　　者：张雅婷 Jeffery Roesler ZHANG Ya-ting;Jeffery Roesler(School of Environmental and Civil Engineering,Jiangnan University,Wuxi 214122,China;Department of Civil and Environmental Engineering,University of Illinois at Urbana-Champaign,IL 61801,USA)

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122 [2]Department of Civil and Environmental Engineering,University of Illinois at Urbana-Champaign,IL 61801,USA

出　　处：《浙江大学学报（工学版）》2020年第6期1194-1201,共8页Journal of Zhejiang University：Engineering Science

基　　金：江苏省自然科学基金资助项目(BK20190604);中央高校基本科研业务费专项资金资助(JUSRP11937);美国伊利诺伊州公路局资助项目(RR-14-9168).

摘　　要：为控制连续配筋混凝土路面(CRCP)的横向裂缝,修建大比尺模型-连续配筋混凝土梁(CRCB),分析混凝土材料、配筋率、纤维及横向预切缝对CRCP开裂的影响.构建解析模型推导横向裂缝间距和宽度的计算表达式,理论量化不同设计参数对CRCP横向裂缝特征的影响.结果表明:解析结果与现场勘测数据吻合,说明解析法切实可行;横向裂缝随着试验梁龄期增长而发展,且于19个月后趋于稳定;配筋率对裂缝间距和宽度影响较大,采用筋径为22.23 mm(#7号钢筋)的试验梁,其裂缝间距和宽度比采用筋径为19.05 mm(#6号钢筋)的试验梁降低了17%左右;采用轻质混凝土可增大裂缝间距、减小裂缝宽度,为控制冲断提供可能;加入纤维和设置横向预切缝可增大裂缝间距、减小裂缝宽度.A large-scale model,continuously reinforced concrete beam(CRCB),was built to analyze the sensitivity of the transverse crack properties for variations in concrete material,reinforcement ratio and the use of macro fibers and active crack control,in order to control the transverse cracks in continuously reinforced concrete pavement(CRCP).An analytical method to calculate crack spacing and width was established to quantify the impact of the parameters.Results show that the analytical results are consistent with the field measured results,indicating the feasibility of the proposed analytical model.Transverse cracks developed with time and became stable after approximately 19-month construction.Steel content has significant effect on transverse cracks with approximately 17%reduction in both crack spacing and width in the test beam using#7 bar with diameter of 22.23 mm,compared to the test beam with#6 bar of 19.05 mm diameter.Lightweight concrete has potential to reduce punchout since it produces higher crack spacing and smaller crack width.With fibers and active crack control,the test beam shows larger crack spacing and less crack width.

关 键 词：连续配筋混凝土路面(CRCP) 大比尺模型试验 横向裂缝间距 横向裂缝宽度 解析模型 

分 类 号：U416[交通运输工程—道路与铁道工程]