Method for efficiently and accurately predicting laminated wood beam ultimate bending moment used for FRP (Fiber Reinforced Plastic) enhancement structure

Abstract

The invention discloses a method for efficiently and accurately predicting a laminated wood beam ultimate bending moment used for an FRP (Fiber Reinforced Plastic) enhancement structure. The method can judge whether a compression resistance area of a beam body is subjected to plastic yield or not through a strain distribution or stress distribution diagram of the section of the beam body and also can carry out the fine tuning of an interpolation position of a neutral axis through judging whether the tensile stress resultant force and the compression stress resultant force of the bending compression resistance area of the beam body meet a static determinacy balance condition so as to calculate the ultimate bending moment borne on the beam body during bending damage failure according to a real position coordinate of the central axis. On one hand, manpower and material resource consumption in an actual measurement process of a traditional method can be saved, and errors generated in a measurement process are eliminated; and on the other hand, a complex calculation process of the traditional method can be saved so as to realize the quick and accurate measurement of the laminated wood beam ultimate bending moment used for the FRP enhancement structure.

Description

Technical field [0001] The invention relates to the technical field of building materials engineering, in particular to a method for efficiently and accurately predicting the ultimate bending moment of a laminated timber beam for an FRP reinforced structure. Background technique [0002] During the load-bearing process of structural glulam wooden beams, the force conditions of different parts of the beam body are different. For this reason, the position of the laminates should be reasonably optimized according to the force law inside the beam body to ensure that the inferior materials are used for small and the good materials are used for the best. FRP (Fiber Reinforced Polymer, fiber reinforced polymer) reinforced laminated timber beam can significantly improve the flexural mechanical strength of the beam. The cost of FRP materials is relatively high. In the process of strengthening the laminated timber beams for the structure, it should be reasonably reinforced according to th...

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Problems solved by technology

[0004] At present, when the factory inspects beam products, it often samples the ultimate bending moment of the beam to evaluate the actual application level of the beam, and more parameters are involved in sampling the ultimate bending moment of the beam. And these parameters are obtained by manual measurement; in addition, in the construction process of the wooden structure building, the appropriate beam body will be selected according to the actual load-bearing and span requirements, which involves the size and specification of the beam body, the tree species used for the beam body, and the beam body. The technical parameters such as the reinforcement ratio of the body and the thickness of the buffer wood layer are also measured manually; it can be seen that the parameters involved in the calculation of the traditional method are all measured manually, resulting in high manpower and material costs.

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