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Study on the Calculation Method of the Bearing Capacity of Damaged Beam Bridges

Author: MaJiCheng
Tutor: HuangPingMing；SunShengJiang
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: Roads and bridges Reinforced concrete beams Plant disease FEM Carrying capacity
CLC: U441
Type: Master's thesis
Year: 2010
Downloads: 78
Quote: 2
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Abstract

With China's rapid development of road transport, an increasing number of bridges. However, traffic continued to rise in recent years, more and more heavy the load on the bridge, the bridge presents a number of diseases in a variety of different levels. Various forms of highway bridges, reinforced concrete beam bridge mostly precisely the existence of the most common diseases form a bridge. The main beam bridge bearing components is the upper reinforced concrete beams, disease makes the existence of a bridge carrying capacity reduction, the use of performance degradation, the use of roads and bridges to bring a safety hazard. In order not to affect the normal operation of the bridge, you must battle disease in reinforced concrete girder bridges carrying capacity for proper evaluation and to make the corresponding effective treatment measures. Currently on the bearing capacity of reinforced concrete beams disease and there is no uniform method of calculation, but according to the extent of damage reduction based on individual experience and a rough estimate, calculation accuracy is poor. To be able to propose more effective and rational calculation method, the paper relies on Zhejiang Provincial Communications Department projects \study to consider concrete reinforcement corrosion damage and disease factors bearing capacity of reinforced concrete beams solving method. This research work has the following main items: 1, according to the existing reinforced concrete beam bridge disease situation, the presence of reinforced concrete beams major disease types collate, analyze the formation mechanism of typical diseases and the impact of component characteristics . 2, analysis of bearing capacity of reinforced concrete beams to solve several methods as well as reinforced concrete structure composed of the mechanical properties of the two materials, in-depth study of the constitutive model of reinforced and strengthened guidelines, concrete constitutive models and failure criteria theory, reinforced with the bond between the concrete slip mechanics. 3, discusses the finite element analysis method of reinforced concrete beams capacity to explore the three existing finite element model of choice for analog and concrete reinforcement corrosion damage as a model to analyze the concrete reinforcement corrosion damage and bearing capacity of reinforced concrete beams the impact of proposed two diseases reasonably accurate finite element simulation method. 4, select the existence of concrete and steel corrosion damaged reinforced concrete beams ultimate load test, measurement control section of the loading process stress and deformation, and ultimately bearing capacity. Combined with the actual components, considering concrete reinforcement corrosion damage and mechanical properties of materials and components of the mechanical properties, the use of finite element method to establish the aforementioned diseases carrying capacity analysis model, calculation and analysis of its capacity. Comparative analysis finite element results and test experimental results verify that the finite element method is reasonable and accurate.

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