預應力CFRP及預緊螺栓聯合加固RC梁力學形為研究
[Abstract]:At present, the application of prestressed CFRP reinforcement technology in the construction of harmful bridge reinforcement is an excellent supplement to the bridge strengthening method, which improves the deficiency of the existing bridge reinforcement methods. The prestressed CFRP technique can increase the ultimate bearing capacity of the bridge, improve the mechanical properties of the bridge, restrain the crack development, reduce the deflection of the bridge, and improve the effective utilization ratio of the carbon fiber cloth. However, there are some problems in the application of the bridge reinforcement technology in the actual bridge strengthening project, which is mainly manifested in the prestressed tensioning system of carbon fiber cloth (the existing tension equipment and anchor device are complicated to operate and occupy a large space. Major damage to the bridge itself and other problems) and construction technology. In this paper, a new tensioning system is designed and developed on the basis and principle of the existing tensioning system and combining with the characteristics of the carbon fiber cloth itself. Design and manufacture of 9 6 m long test beams for large scale experimental research, more close to the actual bridge engineering; The new tension system was used to reinforce 8 test beams with prestressed carbon fiber sheets, and 8 test beams were strengthened with single layer, double layer and three layers of carbon fiber sheets respectively. The initial prestressing force applied is 25% and 75% respectively. 8 test beams are anchored by mechanical anchoring steel plate and 8 test beams are subjected to four point bending loading with self-made reaction frame. The test results show that the new carbon fiber tensioning system can apply the initial stress to the carbon fiber cloth, and the installation and operation of the equipment is convenient and the construction efficiency is high. The reinforced concrete beams strengthened with prestressed CFRP and prestressing bolts can effectively improve the ultimate bearing capacity of the strengthened beams, increase the flexural stiffness of the strengthened beams, reduce the deflection deformation, and restrain the crack development. The carbon fiber sheet can give full play to the high strength performance and improve the mechanical properties of the bridge. Through the analysis and study of mechanical properties of RC beams strengthened with prestressed carbon fiber sheets, the ultimate bearing capacity and deflection of RC beams are analyzed and compared by theoretical calculation and experimental results. The theoretical calculation is in good agreement with the experimental results. The stress mechanism of prestressed carbon fiber cloth and pre-tightening bolt is summarized. This reinforcement technique is used to design and reinforce the K137128 channel in Dongping section of Jihe High Speed G35 Line. The effect is remarkable, and the reinforcement construction technology based on this new tension system is summarized.
【學位授予單位】:山東大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U445.72
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