Simplified calculation method for mechanical property of FRP-rebar-reinforced concrete beam

Abstract

The invention provides a simplified calculation method for the mechanical property of an FRP-rebar-reinforced concrete beam. The method comprises the steps that a space rectangular coordinate system is built, a material stress-strain expression of the FRP-rebar-reinforced concrete beam is analyzed and calculated, a motion control equation of the FRP-rebar-reinforced concrete beam and the force boundary conditions of the FRP-rebar-reinforced concrete beam are built, and a final calculation model of the FRP-rebar-reinforced concrete beam is solved. By means of the method, the overall bending-resistant mechanical property (a load-deflection curve) of the concrete beam, the FRP-rebar strain, the concrete strain, the depth of the neutral axis of the concrete beam and other local mechanical properties can be accurately calculated, the calculated amount is greatly reduced, and the calculation efficiency is improved.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a method for calculating the mechanical properties of FRP reinforced concrete beams. Background technique [0002] FRP (Fiber Reinforced Polymer fiber reinforced composite material) rib is a new type of material composed of high-strength fiber (carbon fiber, glass fiber, aramid fiber, etc.) and base resin, which is extruded and drawn by a special mold. , strong corrosion resistance, good electromagnetic insulation and so on. Due to the above characteristics, using FRP bars instead of traditional steel bars as reinforcement materials for concrete structures can effectively solve the problem of structural performance degradation caused by steel bar corrosion. Composite structure. [0003] At present, the analysis and calculation of the mechanical properties of FRP reinforced concrete beams are mostly based on the reference and correction of the calculation formula of reinforced c...

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Problems solved by technology

[0003] At present, the analysis and calculation of the mechanical properties of FRP reinforced concrete beams are mostly based on the reference and correction of the calculation formula of reinforced concrete beams, which often cannot truly reflect the working status of FRP reinforced concrete beams

In addition, another important analysis method is the finite element method. However, for the composite structure of FRP reinforced concrete beams, although the calculation results of the finite element model have high precision, the calculation amount is often large, and it cannot be obtained quickly and conveniently. At the same time, the calculation process also faces the problem of non-linear iteration non-convergence

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