施工高温作用后CFRP板增强箱梁桥顶板界面有限元分析  

Finite Element Analysis on Interface of Top Plate of Box Girder Bridge Reinforced by CFRP Plate after Construction under High Temperature

作　　者：袁鑫[1,2] 郑伟 Kumar Dabnath SOJIB 孙敏[1] 

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011 [2]东南大学土木工程学院,江苏南京210096 [3]苏州中固建筑科技有限公司,江苏苏州215100 [4]达卡工程技术大学土木工程学院

出　　处：《公路交通科技》2017年第7期44-52,共9页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51508368);国家高技术研究发展计划(八六三计划)项目(2012AA03A204);江苏省省建设厅科技计划项目(2015ZD78);江苏省结构工程重点实验室开放课题项目(ZD1401)

摘　　要：为了研究SMA(沥青玛蹄脂)摊铺高温作用后CFRP板-混凝土界面剥离破坏,采用SMA摊铺的高温作用后的界面有限单元进行剥离破坏准则定义和回归分析。借助大型通用有限元软件MSC.MARC调用界面有限单元并对CFRP板箱梁桥顶板进行有限元模拟。通过有限元分析可以看出:当荷载值比较小时,CFRP板-混凝土界面未产生裂缝,CFRP板与混凝土间黏结性能较好,沿着梁跨中至梁端方向,CFRP板应变值呈递减趋势。随着荷载值增大,在试验梁跨中位置附近,CFRP板-混凝土界面层出现初始剥离,在界面层剥离区域,CFRP板应变值曲线斜率明显下降,CFRP板应变曲线形状近似S形。随着荷载值增加,在剥离区长度范围内,CFRP板S形应变值沿自由端方向扩展逐渐增大,初始剥离一旦开始,荷载值随之骤然下降;在剥离区域,CFRP板应变值维持恒值不变。研究表明:通过定义SMA摊铺高温作用后CFRP板-混凝土界面单元,引入双重剥离破坏准则,CFRP板-混凝土的界面受剪可通过恒定的裂面剪力传递系数来描述,根据箍筋量配置的不同来描述开裂后混凝土受剪行为,混凝土的开裂形态借助开裂应力描述,受拉软化形态借助软化模量描述,较好地模拟了特殊环境下的CFRP板-混凝土界面的剥离破坏过程。In order to research the interface debonding damage between CFRP plate and concrete after high temperature function of SMA （ asphalt mastic ） paving, the debonding failure criteria is defined and the regression analysis is carried out by the interface finite element after the high temperature effect of SMA paving. Interface finite elements are called through the large general finite element software MSC. MARC and the box girder bridge reinforced by CFRP plate are analysed. Through the FE analysis, it can be seen that （ 1 ） when the load value is in smaller value, there is no crack in the interface of CFRP plate and concrete, good bonding performance is appeared between the CFRP plate and concrete, and the strain decreasing trend is appeared in the CFRP plate in the direction of mid-span to beam end ; （2） with the increasing of load, the initial detachment occurred in the CFRP plate and concrete interface near the mid-span of test girder, the strain curve slope of the CFRP plate is obviously felled, and the approximate S-shape is appeared in the strain curve; （3） with the increasing of load, the increasing trend of CFRP plate appeared in the aspect of S- shaped strain along the direction of the free end within the scope of the stripping length, the load is dropped rapidly as the initial debonding appeared; （4） a certain strain value phenomenon is remained in the CFRP plate in the debonding region. The result shows that by defining CFRP plate-concrete interface unit after the high temperature effect of SMA paving, and introducing double stripping failure criterion, the shear behavior of CFRP plate and concrete interface can be described by constant crack surface shear transfer coefficient, the shear behavior of concrete after cracking is described depending on the configuration of stirrup, the cracking form of concrete is described by the cracking stress, the tensile softening form is described by the softening modulus, thus the debonding damage process of the CFRP plate-concrete interface under

关 键 词：桥梁工程 结构增强 有限元 CFRP板 界面单元 混凝土 施工高温 SMA MSC.MARC 

分 类 号：U445.7[建筑科学—桥梁与隧道工程]