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Research on Applicable Type of Concrete Bridges Based on the Cracks

Author: JiangZuo
Tutor: MiaoZhangMu；JiangXiangLin
School: Wuhan University of Technology
Course: Naval Architecture and Ocean Engineering
Keywords: Reinforced concrete bridge Fracture parameters Bridges Selection Regression analysis
CLC: U448.33
Type: Master's thesis
Year: 2011
Downloads: 59
Quote: 0
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Abstract


Reinforced concrete structure, carrying capacity, temperature performance, low cost, and at the same time can play the advantages of high tensile strength and compressive strength of concrete reinforced, has been widely used in the field of bridge engineering. However, the bridge has been built the prevalence of the disease (such as cracks, etc.) premature phenomenon of structural damage or even collapse. Modern bridge construction in order to avoid or mitigate such problems occur, more from the late remedy for such problems to be addressed. However, the remedies are not fundamentally solve the problem of diseases frequently appear, like cracks in this type of disease is not a single improve the quality of the materials and improved construction techniques will be able to avoid it with a structure type, structure force status are closely links. Therefore, it is necessary in the design phase for these diseases prevention design, by selecting appropriate bridge type as much as possible to avoid or delay the emergence of diseases, and to improve the durability of the bridge structure, extend the bridge life. Firstly, the mechanism of cracks as a starting point, starting from the point of view of the structure carrying capacity on the basis of the analysis of bridge cracks form and the reasons, details the common form of structural cracks and non-structural cracks and its causes. And analysis derived In all bridges disease, flat-slab cracking is the most common and on the bridge structure negatively affect this conclusion in the form of a larger disease, decided to bridge disease as the main contents of this paper in the form of. And the importance of bridge assessment described instructions on the the bridge assessment cracks evaluation, and fracture evaluation indicators were analyzed and summarized as a basis for guidance bridges selection of practical significance and its feasibility. On this basis, further analysis of the impact of the cracks in the bridge structure factors and their associated sensitive characteristics come to the the bridge structure associated with cracks evaluation sensitive factors. In addition, get 64 bridge cracks data regression analysis, draw bridges cracks indicators with the distribution curve of the span, the distribution curve and draw a comparative analysis, summarizes obtained sensitive bridge structure factors classified 64 bridges, the fracture parameters of similar bridges with the span of the distribution law. Finally, through the study of the distribution curve with span bridges derived fracture parameters, the cracks in the structure-sensitive factors and fracture parameter the crack data aggregation with the same bridge span distribution law with regression analysis to investigate the the particular structural form of the maximum crack width and the relative fracture length distribution with span envelope curve and the curve equation formula, and drawn from the basis of the the bridge selection program based on the fracture parameters.

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridges: the material points > Concrete bridge
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