摘要
为了减少温度梯度对连续配筋混凝土路面(CRCP)反演分析的影响,对CRCP在极端环境(混凝土板顶与板底温度差值|ΔT|≥13.32℃)下的反演方法进行了修正.采用二维有限元软件ILLISLAB建立在不同温度差值(|ΔT|=4.44,8.88,13.32,17.76℃)和FWD荷载共同作用下的CRCP双车道模型,通过有限元模型得到理论弯沉值,对原有反演方法进行可靠性验证,量化不同温度差值对反演结果的影响.结果表明:当|ΔT|≥13.32℃(24)时,对横向裂缝间距大于3.0 m(10 feet)的CRCP,温度差值引起的反演参数(地基反应模量k值、混凝土弹性模量E和有效厚度heff)误差分别高达66.6%,27.8%和8.5%,难以忽略,进而提出适用于该环境下的反演方法.最后,将其应用到美国芝加哥某收费高速公路的CRCP试验段上,结果表明该路段中混凝土板与基层的层间黏结情况整体较好.
Corrections were made to reduce the error caused by temperature gradient based on the existing continuously reinforced concrete pavement(CRCP)backcalculation method given the condition of temperature difference(|ΔT|≥13.32℃)between the top and bottom of CRCP slab.Multiple finite element models given different combinations of temperature difference(|ΔT|=4.44,8.88,13.32,17.76℃)and FWD(falling weight deflectometer)load were established using ILLISLAB,a 2-D finite element analysis software,to simulate a two-lane CRCP.The study was conducted based on the theoretical deflection values from the finite element model with the main factor being the influence of temperature difference on backcalculated results.The results show that maximum errors in backcalculated results(k-value,E and h eff)reached 66.6%,27.8%and 8.5%,respectively,when temperature difference is greater than 13.32℃given the crack spacing in CRCP being higher than 3.0 m(10 feet),which cannot be ignored and as a result,an updated CRCP backcalculation method given higher temperature gradient condition was developed.The proposed backcalculation method was applied to a field CRCP test section near Chicago with the bonding condition between slab and base assessed to be overall good.
作者
张雅婷
Jeffery Roesler
黄志义
Zhang Yating;Jeffery Roesler;Huang Zhiyi(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Department of Civil and Environmental Engineering,University of Illinois at Urbana-Champaign,IL 61801,USA)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第4期706-712,共7页
Journal of Southeast University：Natural Science Edition
基金
国家留学基金资助项目(201506320161)
国家交通运输部资助项目(2011318806780)
美国伊利诺伊州收费公路局资助项目(RR-14-9168)
关键词
连续配筋混凝土路面
落锤式弯沉仪
反演方法
温度梯度
有效厚度
层间黏结情况
continuously reinforced concrete pavement(CRCP)
FWD(falling weight deflectometer)
backcalculation procedure
temperature gradient
effective thickness
bonding condition
