土木工程专业中英文翻译文摘.doc

Finite element method analysis of a concrete bridge repaired with fiber reinforced plastic laminatesJoseph W.Tedesco, J.Michael Stallings.Mahmoud El-Mihilmy, Department of Civil Engineering,Auburn University,Auburn,AL 36849,USAMartin Peltyn and Early,Reno,NV 89502,USAAbstractMany reinforced concrete bridges throughout the United States on county and state highway systems are deteriorated and/or distressed to such a degree that structural strengthening of the bridge or reducing the allowable truck loading on the bridge by load posting is necessary to extend the service life of the bridge .The structural performance of many of these bridges can be improved through external bonding of fiber reinforced plastic(FRP) laminates or plates.This paper summarizes the results of a comprehensive finite element method(FEM)analysis of a deteriorated reinforced concrete bridge repaired with externally bonded FRP laminates.Static and dynamic analyses of the bridge were conducted for conditions both before and after the FRP repairs,with loading by two identical test trucks of known weight and configuration.The results of the FEM analyses were corroborated with field test data.The results of a parametric study to assess the effects of altering the cross sectional dimensions and material properties of the FRP laminates upon bridge girder deflections and reinforcing steel stresses is also presented.在美国，许多通过各地县，洲际的公路系统的钢筋混凝土桥梁被恶化和/或困扰到这种程度，桥梁结构加固或通过荷载记录减少卡车容许载荷对延长大桥服务年限是必需的。

许多这种桥梁的结构性能，可以通过提高外部FRP碾压与金属的连接本文概述一个广泛运用于恶化的钢筋混凝土桥梁外部FRP碾压维修的有限元分析方法所取得的成果在利用玻璃钢维修前后桥梁静态和动态分析的桥梁被条件所引导，应该利用两个相同重量和外形的汽车装载有限元分析的结果可以通过现场测试的数据来保证变量研究的结果是为了评估对改变交叉组合尺度的影响，玻璃钢碾压材料设备对桥梁的影响与加强钢筋压力同样出现@1999 Elsevier Science Ltd.All rights reserved.@ 1999年科学Elsevier公司版权所有1. IntroductionA significant percentage of the bridges in North America were built after the Second World War.Most of them were originally designed for smaller vehicles, lighter loads and a lower traffic volume than commonly experienced today.Furthermore,over 50% of all bridges in the United States were built before 1940,and approximately 42%of these bridges are considered to be structurally deficient[1].This alarming statistic underscores the importance of developing reliable and cost-effective repair and strengthening techniques for existing bridge structures.第二次世界大战后，在北美建成的大桥中占有重大的比例。

他们中的大多数是根据比现在普通经历的更小的交通工具，驳船的装载量以及更低的交通量来设计的，此外，美国超过50%的桥梁中建于1940年以前， 这些桥中大约又42%被认为结构不完善，这些令人担忧的统计数据强调了发展可靠的，具有综合经济效益的维修以及加固现有桥梁结构技术的重要性In the past,various methods have been used to strengthen bridges and other types of structures.Traditionally,structural rehabilitation has been accomplished by methods such as introducing additional beams to the structure or by strengthening existing beams with externally post-tensioned cables.In recent years,mechanical attachment of steel plates to the tension face of the deficient member has proven to be a successful repair technique for many structures.However,the use of steel plates has many disadvantages,such as corrosion,difficulty in handling the plates,deterioration of the bond at the steel-concrete interface and the requirement of massive scaffolding during installation. 在过去，各种方法已被用来加固桥梁和其他类型的结构，传统上，诸如增设传统梁结构或者通过布置张拉索来加固现有梁等方法来改善结构已经完成，近年来，对多数结构来说，利用钢金属板机械装置张拉外部不完善的部分已经被证实是一种成功的修复技术，然而，钢金属板的使用有很多的缺点，如腐蚀，金属板处理发杂，钢筋混凝土接触面容易退化以及在厚重的脚手架安置过程中要求必备的条件。

Unidirectional fiber reinforced plastic(FRP)sheets made of carbon(CFRP),glass(GFRP)or aramid (AFRP) fibers bonded together with a polymer matrix (e.g.epoxy,polyester,vinylester)are being used as a substitute for steel plates in many repair applications. FRP plates are an attractive solution over steel plates because of their ease in handling,resistance to corrosion,light weight and high strength.Recent experimental[2-5]studies have shown that reinforced concrete beams strengthened with externally bonded FRP laminates can exhibit ultimate load capacities as high as three times their original capacity depending on the steel ratio,concrete strength,FRP ratio,FRP mechanical properties,properties of the bonding agent,and pre-existing level of damage of the beams.由碳（碳纤维复合材料） ，玻璃（玻璃钢）或芳纶（AFRP）有保证的光纤混合一个聚合物基体（如环氧的化合物，聚酯，乙烯基酯）制成的单向纤维增强塑料（玻璃钢）板在很多维修应用中已经被用来替代钢金属板。

FRP金属板是一种比钢金属板更能吸引人的解决方案，因为他们处理简便，耐腐蚀，重量轻和强度高最近实验[ 2-5 ]研究表明，梁在外部通过有保证的FRP碾压来加固的钢筋混凝土梁最后可以承受的最大荷载容许值是最初依靠钢比例，混凝土强度，FRP比例，FRP机械设备，代理连接设备，和梁破坏的现有标准的三倍While laboratory experiments have illustrated the effectiveness of using FRP in repairs,and some field applications of FRP have been reported,there is a lack of test data illustrating the field performance of FRP repairs.The behavior of a repaired bridge is quantified by measurements of vertical deflections, strains in the primary flexural reinforcement,and strains on the surfaces of the FRP plates.Typically, these data are recorded from static and dynamic field tests conducted with test trucks of known weight and configuration.To this end,a research project was conducted for the Alabama Departme。