本文關鍵詞：濕熱環(huán)境下CFL-混凝土界面疲勞本構關系研究　出處：《華南理工大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 濕熱環(huán)境 本構關系 碳纖維薄板(CFL)-混凝土界面 疲勞 粘結—滑移

【摘要】：纖維增強復合材料（Fiber Reinforced Polymer，簡稱FRP）以其材質輕、可設計、強度高、抗疲勞性能好、耐腐蝕和耐久性好等優(yōu)點，已廣泛應用于混凝土結構的加固修復工程中。界面層作為FRP與混凝土之間的過渡層，是從混凝土向FRP傳遞應力的橋梁。以往的實驗研究結果表明，F(xiàn)RP-混凝土界面的剝離破壞是該類加固構件的主要破壞形式之一，而界面層的性能直接影響FRP加固混凝土構件的承載能力和疲勞性能。因此，開展FRP-混凝土界面的疲勞本構關系研究具有重要的科學意義和工程應用價值。 本文采用本課題組發(fā)明的新型FRP片材—碳纖維薄板（Carbon Fiber Laminate，簡稱CFL）與鋼筋混凝土（RC）梁的粘結界面作為研究對象，考慮我國南方和沿海等地區(qū)的濕熱大氣環(huán)境對公路運營橋梁的影響，采用實驗研究與理論分析相結合的方法，探討在濕熱環(huán)境下CFL-混凝土界面的疲勞本構關系。主要研究內容和結論如下： （1）根據廣東地區(qū)的亞熱帶氣候特點，制定相應的濕熱環(huán)境條件，對試件進行環(huán)境預處理，然后通過雙剪疲勞實驗，分別對試件的疲勞壽命、荷載位移曲線、試件相對滑移的演化規(guī)律及峰值荷載下CFL上應變的演化規(guī)律進行了探討。研究結果表明，高溫高濕環(huán)境會使界面的變形增大、疲勞壽命降低，而且極限位移也會增大。 （2）通過對雙剪疲勞實驗全過程的跟蹤和觀測，，發(fā)現(xiàn)在經過濕熱環(huán)境預處理后，CFL-混凝土粘結界面的疲勞破壞過程呈現(xiàn)明顯的三階段演化規(guī)律，即其疲勞破壞由初期的混凝土開裂、界面穩(wěn)定剝離、失穩(wěn)剝離三階段構成。 （3）根據雙剪疲勞實驗結果，初步探明了CFL-混凝土界面粘結強度的退化規(guī)律。在此基礎上，利用雙剪疲勞實驗數(shù)據和Popovics模型，提出了濕熱環(huán)境下CFL-混凝土界面的疲勞本構關系式。
[Abstract]:Fiber Reinforced Polymer (FRP) is a kind of fiber reinforced composite material, which has the advantages of light material, design ability, high strength and good fatigue resistance. Due to its advantages of good corrosion resistance and durability, it has been widely used in the reinforcement and restoration of concrete structures. The interface layer is used as the transition layer between FRP and concrete. The experimental results show that the debonding failure of FRP- concrete interface is one of the main failure forms of this kind of strengthened members. The performance of interface layer directly affects the bearing capacity and fatigue performance of concrete members strengthened by FRP. It is of great scientific significance and engineering value to study the fatigue constitutive relation of FRP-concrete interface. In this paper, a new FRP sheet, carbon Fiber Laminate, is developed by our team. The bond interface between CFL) and RC beams is taken as the research object. The influence of the humid and thermal atmosphere environment on the highway operation bridges in the south and coastal areas of China is considered. In this paper, the fatigue constitutive relationship of CFL- concrete interface under humid and hot environment is studied by combining experimental research with theoretical analysis. The main contents and conclusions are as follows: 1) according to the characteristics of subtropical climate in Guangdong, the corresponding conditions of humid and thermal environment were established, and the samples were pretreated by environmental pretreatment, and then the fatigue life of the specimens was tested by double shear fatigue test. The load-displacement curve, the evolution law of relative slip of specimen and the evolution law of strain on CFL under peak load are discussed. The results show that the deformation of interface will increase in high temperature and high humidity environment. The fatigue life decreases and the limit displacement increases. 2) through tracking and observing the whole process of double shear fatigue experiment, it is found that the fatigue failure process of CFL- concrete bond interface after preconditioning in humid and hot environment shows an obvious three-stage evolution law. That is to say, the fatigue failure consists of three stages: initial crack of concrete, stable exfoliation of interface and unsteady exfoliation. 3) based on the experimental results of double shear fatigue, the degradation law of CFL- concrete interfacial bond strength is preliminarily proved. Based on this, the double shear fatigue test data and Popovics model are used. The fatigue constitutive equation of CFL-concrete interface in humid and hot environment is presented.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441.4

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