The Calculation Method of the Ultimate Bearing Capacity of the Front Section of the Core Beam Strengthened by CFRP Plate

Abstract

The invention provides a calculation method of an ultimate bearing capacity of a normal section of a CFRP (Carbon Fiber Reinforced Plastics) plate strengthened core beam, and belongs to the technical field of beam reinforcement. The calculation method comprises the following steps: step (1), making a basic assumption for a reinforcement process; step (2), calculating a stress-strain relationship of a cross section of a core material in the case of failures of various materials in the reinforced core beam; step (3), calculating the height of a compression zone of the cross section of the core material in the case of failures of various materials; step (4), calculating the height of plastic development of the compression zone of the cross section of the core material in the case of failures of various materials; and step (5), according to height of the compression zone and the height of the plastic development of the compression zone in the case of failures of various materials, calculating a corresponding flexural capacity of the normal section of the strengthened core beam in the case of failures of various materials, and obtaining the ultimate bearing capacity of the normal section of the strengthened core beam considering plastic development. The calculation method of the ultimate bearing capacity of the normal section of the CFRP plate strengthened core beam provided by the invention can effectively calculate the ultimate bearing capacity of the normal section of the CFRP plate strengthened core beam considering the plastic development, and provide a strong theoretical guidance for engineering application.

Description

technical field [0001] The invention belongs to the technical field of beam reinforcement, and relates to a calculation method of the ultimate bearing capacity, in particular to a calculation method of the ultimate bearing capacity of reinforced cored beams. Background technique [0002] The vast majority of ancient Chinese buildings belong to wooden structure buildings. Due to long-term exposure to the sun and rain, termite erosion, and corrosion and aging of component surfaces, the safety of these ancient buildings is decreasing year by year. At present, the reinforcement and repair of wooden components of ancient buildings generally adopts the replacement of whole beams, or grouting filling of holes and cracks. These methods have improved the safety of ancient buildings to a certain extent; their disadvantages are that the beams and columns of the building need to be unloaded before replacing the beams and columns, which has potential safety hazards, and the construction ...

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Problems solved by technology

These methods have improved the safety of ancient buildings to a certain extent; their disadvantages are that the beams and columns of the building need to be unloaded before replacing the beams and columns, which has potential safety hazards, and the construction speed is slow and the cost is high

[0004] There are a large number of theoretical and experimental analyzes at home and abroad for the methods and technologies of wooden beam reinforcement and repair, but basically the reinforcement methods such as directly pasting steel, cloth and ribs on the surface of the original beam members are used to improve the damage. Reinforcement technology with the main goal of bearing capacity or stiffness of the test piece, and the method of reinforcement treatment is one-way, irreversible, and cannot be reinforced twice, and has a great influence on the appearance of wooden beams

What is especially important is that how to conduct systematic research on the structural system design theory of the strengthening technology that can protect the appearance of the building and can be reinforced twice. At present, there is no theoretical basis and analysis and design method to guide engineering applications, let alone The corresponding normative procedures can be followed in accordance with

Especially when calculating the ultimate bearing capacity of strengthened beams, usually only the ultimate bearing capacity of elastic development is considered, and the ultimate bearing capacity of plastic development is not considered, which cannot objectively reflect the performance of reinforced beams and cannot provide a reasonable theoretical basis for engineering applications

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