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)-wenkub
2023-05-18 13:38:07 本頁(yè)面
【正文】 , 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 should be thoroughly evaluated. Evaluation of existing bridge elements or systems involves review of the asbuilt drawings, as well as accurate estimate of the condition of the existing bridge, as shown in Figure2. Depending on the purpose of evaluation, nondestructive tests may involve estimation of strength, salt contents, corrosion rates, alkalinity in concrete, etc. Figure2 Visible concrete distress marked on an elevation of a concrete bridge pier Although most of the nondestructive tests do not cause any damage to existing bridges, some NDT may cause minor local damage (. drilled holes amp。 coring) that should be repaired right after the NDT. These tests are also referred to as partial destructive tests but fall under nondestructive testing. In order to select the most appropriate nondestructive test for a particular case, the 4 purpose of the test should be identified. In general, there are three types of NDT to investiga
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