銹蝕RC梁抗彎承載性能及其增強(qiáng)技術(shù)研究
[Abstract]:Reinforced concrete (RC) beam is one of the most widely used basic members in civil engineering field. The yield strength and elastic modulus of RC beams are degraded to different degrees, which greatly weaken the flexural bearing capacity of RC beams. (CFRP) reinforced carbon fiber composites (CFRP) have been widely used in the reinforcement and repair of RC beams by virtue of its advantages of high tensile strength, corrosion resistance and light weight. Therefore, it is necessary to study quantitatively the deterioration law of flexural bearing capacity of corroded RC beams, and to establish the calculation method of flexural bearing capacity of corroded and CFRP reinforced corroded RC beams. The relationship between flexural bearing capacity and reliability index of corroded RC beams strengthened by CFRP is discussed. In addition, in order to demonstrate the inhibition effect of nano-kaolin cement mortar on the secondary corrosion of RC beams, the reinforcement test of corroded RC beams was carried out by using the method of increasing cross section. The specific research contents include the following aspects: (1) the experimental beams with different corrosion rates of main tendons are obtained by artificial electrification, and the distribution and development law of rust expansion cracks of corroded beams are clarified, and the static loading tests are carried out. The bending bearing capacity and other mechanical indexes of corroded and corroded RC beams strengthened by CFRP are obtained. (2) based on the classical laminated beam theory of composite mechanics, the formulas for calculating the flexural bearing capacity of corroded and CFRP strengthened RC beams under linear elastic conditions are established. The corresponding load-deflection relationship is obtained and compared with the experimental data. (3) in the general finite element software of ANSYS, the corresponding static loading models of corroded and corroded RC beams are established. On the basis of comparing the experimental data to prove that the model is reasonable, the finite element method is adopted. The bond-slip law between rusty and CFRP strengthened RC beams is quantitatively analyzed. (4) based on the first-order second-order moment method, the formula for calculating the reliability of flexural bearing capacity of corroded RC beams strengthened by CFRP is established. The law of synergistic variation between reliability index and ultimate load is analyzed, which provides prejudgment and suggestion for concrete strengthening time. With the help of MATLAB GUI toolbox, the corresponding calculation interface of reliability index is compiled. (5) the "rust-strengthening-corrosion-corrosion" history test of the test beam is carried out with three reinforcement methods; In this paper, the variation of secondary corrosion current intensity and the deterioration of flexural bearing capacity of the corroded RC beams are analyzed, and the ability of reinforcing the reinforced cement mortar with nano-kaolin to delay the secondary corrosion process of the corroded RC beams is demonstrated.
【學(xué)位授予單位】:大連海事大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U441
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