An efficient and accurate method for predicting the ultimate bending moment of glulam timber beams for frp reinforced structures

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 material engineering, in particular to a method for efficiently and accurately predicting the ultimate bending moment of glulam beams used in FRP reinforced structures. Background technique [0002] During the load-bearing and bending process of glulam timber beams for structural purposes, the stress on different parts of the beam body is different. For this reason, the orientation of the laminates should be rationally optimized according to the force law inside the beam body, so as to ensure that inferior materials can be used in small quantities and high-quality materials can be used in large quantities. FRP (Fiber Reinforced Polymer, fiber-reinforced polymer) reinforced glulam wood beams can significantly improve the bending strength of the beam body. The cost of FRP materials is relatively high. In the process of strengthening the structural glulam timber beams, the reinforcement should be r...

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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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