橋梁畢業(yè)設計外文翻譯--碳纖維復合材料修復混凝土橋梁結構的詳述及應用-wenkub.com
2025-05-06 13:37 本頁面
【正文】 在極易被腐蝕的環(huán)境中，防腐蝕的碳纖維復合材料體系應當被應用，以便成功的修復受損的混凝土橋梁。鋼筋的銹蝕可能會導致混凝土橋梁的構件發(fā)生彎曲或者剪切破壞。 圖 3 碳纖維復合材料混 凝土墩柱彎剪強度的加強 由于鋼筋的銹蝕而導致的鋼筋截面面積的損失和混凝土保護層的損壞是混凝土橋梁構件損壞的根本原因。然而，在交通荷載作用下，結構在破壞之前 且全局的形變在可接受的程度內，碳纖維復合材料板與混凝土基質之間局部的脫膠是被允許的。纖維以其獨特的結構性能使兩者良好復合。 5 碳纖維復合材料修復受損橋梁的應用 碳纖維復合材料的應用 延長了既有混凝土橋梁的使用年限而變得越來越引人注目。 如果上述提供的信息，不足以用來進行高水平的評估。 質量和耐久性試驗方法包括：鋼筋銹蝕率 — 現場試驗，現場檢測剖面氯化物，驗定鋼筋銹蝕率，測試鋼筋電阻率，現場測定 堿質與粒料反應活性 ，混凝土堿度測定（碳化測定），混凝土的滲透性（現場滲透性試驗）。 圖 2 混凝土橋墩可見缺陷正面圖 為了針對特殊情況選擇最合適的無損檢測，應該明確測試的目的。 評價現有橋梁的元素或體系需要 翻看 asbuilt圖紙 ，才能準確的評估出現有橋梁的狀況，如圖2所示。通常由混凝土保護層預防受力筋的腐蝕。越來越多的橋梁在達到設計使用年限之前出現令人側目的破損。本文通過合適的例子給出了修復受損混凝土梁橋的準則，列出了評估、無損檢測、碳纖維復合材料復原受損混凝土橋梁。 應用碳纖維復合材料可以 恢復混凝土橋梁最初的狀況并延長其使用年限。這些因素包括但又不僅限于化學物的侵蝕，受力鋼筋的銹蝕，混凝土的碳化，化學物質的聚合反應。然而，采用碳纖維復合材料修復 受損 混凝土橋梁的指導和規(guī)范還非常有限。 rebar corrosion rate – field test, chloride profile field test, rebar corrosion analysis, rebar resistivity test, alkalisilica reactivity field test, concrete alkalinity test (carbonation field test), concrete permeability (field test for permeability). 4 Nondestructive Evaluation of Deteriorated Concrete Bridge Piers The process of evaluating the structural condition of an existing concrete bridge consists of collecting information, . drawings and construction amp。 and to extend the service life of concrete bridges is by the use of carbon fiber reinforced polymer (CFRP) posites. There appear to be very limited guides on repair of deteriorated concrete bridges with CFRP posites. In this paper, guidelines for nondestructive evaluation (NDE), nondestructive testing (NDT), and rehabilitation of deteriorated concrete bridges with CFRP posites are presented. The effect of detailing on ductility and behavior of CFRP strengthened concrete bridges are also discussed and presented. KEYWORDS: Concrete deterioration, corrosion of steel, bridge rehabilitation, CFRP posites. 1 Introduction There are several destructive external environmental factors 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. 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 b
畢業(yè)設計相關推薦
鄂ICP備17016276號-1