橋梁畢業(yè)設(shè)計(jì)外文翻譯---碳纖維復(fù)合材料修復(fù)混凝土橋梁結(jié)構(gòu)的詳述及應(yīng)用-橋梁設(shè)計(jì)-在線瀏覽
2025-07-30 13:38本頁面
【正文】 that limit the service life of bridges. These factors include but not limited to chemical attacks, corrosion of reinforcing steel bars, carbonation of concrete, and chemical reaction of aggregate. If bridges were not well maintained, these factors may lead to a structural deficiency, which reduces the margin of safety, and may result in structural failure. In order to rehabilitate and/or strengthen deteriorated existing bridges, thorough evaluation should be conducted. The purpose of the evaluation is to assess the actual condition of any existing bridge, and generally to examine the remaining strength and load carry capacity of the bridge. 1 Associate Professor, Syracuse University, . 2 Lecturer, Sripatum University, Thailand. 2 One attempt to restore the original condition, and to extend the service life of concrete bridges is by the use of carbon fiber reinforced polymer (CFRP) posites. In North America, Europe and Japan, CFRP has been extensively investigated and applied. Several design guides have been developed for strengthening of concrete bridges with CFRP posites. However, there appear to be very limited guides on repair of deteriorated concrete bridges with CFRP posites. This paper presents guidelines for repair of deteriorated concrete bridges, along with proper detailing. Evaluation, nondestructive testing, and rehabilitation of deteriorated concrete bridges with CFRP posites are presented. Successful application of CFRP posites requires good detailing as the forces developed in the CFRP sheets are transferred by bond at the concreteCFRP interface. The effect of detailing on ductility and behavior of CFRP strengthened concrete bridges will also be discussed and presented. 2 Deteriorated Concrete Bridges Durability of bridges is of major concern. Increasing number of bridges are experiencing significant amounts of deterioration prior to reaching their design service life. This premature deterioration considered a problem in terms of the structural integrity and safety of the bridge. In addition, deterioration of a bridge has a considerable magnitude of costs associated with it. In many cases, the root of a deterioration problem is caused by corrosion of steel reinforcement in concrete structures. Concrete normally acts to provide a high degree of protection against corrosion of the embedded reinforcement. However, corrosion will result in those cases that typically experience poor concrete quality, inadequate design or construction, and harsh environmental conditions. If not treated a durability problem, . corrosion, may turn into a strength problem leading to a structural deficiency, as shown in Figure1. 3 Figure1 Corrosion of the steel bars is leading to a structural deficiency 3 Nondestructive Testing of Deteriorated Concrete Bridge Piers In order to design a successful retrofit system, the condition of the existing bridge
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