Bearing capacity assessment and reinforcement calculation method for complex region of existing concrete bridge

Abstract

The invention discloses a bearing capacity assessment calculation method for a complex region of an existing concrete bridge. The method comprises the steps of determining load and boundary conditions of the complex region for diseases such as reinforcement corrosion, concrete cracking, carbonization and the like appearing in the complex region; establishing a pull rod model and a press rod model of the complex region; according to a detection result, further determining reduction coefficients of a pull rod, a press rod and a joint after the diseases are considered; making a calculation according to a pull rod strength control rule, a press rod strength control rule and a joint strength control rule to obtain a minimum bearing capacity value; and finally, according to a bearing capacity assessment result, determining a reinforcement load transfer model, continuously adjusting the positions of the reinforced pull rod, press rod and joint, or continuously increasing the reinforcement amounts of the pull rod and the press rod until the usage requirements are met. According to the method, the problems of inapplicability of a section method in calculating the complex region of concrete, complex calculation for a finite element method and difficulty in arrangement of reinforcement are solved and the bearing capacity of a complex region of an old bridge can be accurately estimated.

Description

technical field [0001] The invention relates to a calculation method for evaluating and reinforcing the bearing capacity of complex areas of existing concrete bridges, belonging to the technical field of bridge engineering Background technique [0002] Existing concrete bridges have different damages due to the joint action of load and adverse environment, mainly manifested as material deterioration (corrosion of steel bars, concrete carbonation, chloride corrosion, etc.) and section damage (cracks, surface damage, etc.) and other diseases. The existence of these factors will lead to a reduction in the bearing capacity of the structure, and its true bearing capacity cannot be obtained through destructive tests because the structure needs to continue to be used. [0003] In 2011, the Ministry of Transport of the People's Republic of China issued the "Regulations for Testing and Evaluation of Highway Bridge Bearing Capacity" (JTG / TJ21-2011). The coefficient evaluation standar...

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Problems solved by technology

[0005] Aiming at the above-mentioned problems encountered in the evaluation and reinforcement of the bearing capacity of complex areas of existing concrete bridges, the patent of the present invention proposes a calculation method for the evaluation and reinforcement of bearing capacity of complex areas of existing concrete bridges, which solves the problem of calculating the complex areas of concrete by section method. Applicability, complex calculation of finite element method, and difficult reinforcement

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