Survey And Analysis Of Crack Of Cable-stayed Bridge High Tower Column

Traditional methods of artificial observation and measurement are often applied to crack monitoring of the tower of the operation cable-stayed bridge. However, due to the high cost of traditional methods, long time, traffic suspension and the over-100m tower, the traditional methods are hard to arrive some important parts to observe their health status which would impact correct analysis and evaluation of the tower. This thesis aims to real-time monitoring of the tall tower of cable-stayed bridge through the crack monitoring system with video collection.Finiting element simulation and analysis of internal forces of the tower structure with cracks information, the development and causes of cracks is analyzed,and the feasibility of security of the tall tower assessed is illustrateed.Through a detailed analysis of existing common filtering algorithms, the scope for a variety of filtering algorithms and image characteristics of crack, median filtering method is proposed in the present thesis. The binary image for the crack segmentation, image stitching technology, crack vector technology and reproduction technology of crack image simulation are adopted to realize crack monitoring information processing. A survey of information structural cracks of reinforced concrete tower through the internal forces and structural deformation conditions of the tower structure is conducted to analyze the causes of its fracture. By analyzing the relationship between the crack basic parameters and the external load of tower structures, the relations among the crack width, length and security of the tower are further studied,based on the constitution of concrete and steel materials, which analyzes the whole process of crack development of the tower structure.The thesis describes the model of the tower structural framework and finite element model theory and proposes the method of realization of model simulation of tower structure of cable-stayed bridge; it also proposes finite element method of crack width of reinforced concrete tower structure on the basis of generalization and summarization the finite element calculation method of crack width of diffuse model proposed by Song Yupu and Zhao Guofan and consideration of the role of concrete and steel strain.After combining the digital image processing technology, crack monitoring information processing technology, internal force analysis and the security of tower structure with establishing simulation finite element model, the present thesis has though out how to conduct assessment of a tall tower cable-stayed bridge health status , decrease accidents to a large extent, improve bridge maintenance, management, and actively promote the development of intelligent bridge.