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

A technology for simplifying calculations of concrete beams, applied in the field of civil engineering, can solve problems such as non-convergence of nonlinear iterations, inability to obtain calculation results quickly and conveniently, and difficulty in truly reflecting the working status of FRP reinforced concrete beams

Inactive Publication Date: 2018-02-27
CHONGQING UNIV
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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 el

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

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Embodiment 1

[0074] This embodiment discloses a simplified calculation method for the mechanical properties of FRP-reinforced concrete beams, including the following steps:

[0075] 1) see Figure 1 ~ Figure 3 , the space Cartesian coordinate system o-xyz is established with the intersection point o of the symmetry axis and the neutral axis of the cross-section of the FRP reinforced concrete beam A end as the origin. Wherein, let the axis of symmetry of the cross section be the z-axis, and the downward direction be positive. The neutral axis is the y-axis. The length direction of the FRP reinforced concrete beam before deformation is the x-axis, and the direction pointing to the B end is positive.

[0076] 2) see Figure 4 , analyze and calculate the material stress and strain expression of any point x, z on the xz section of the FRP reinforced concrete beam. Among them, the calculation criteria are as follows:

[0077] (a) The axial displacement u of the concrete beam C , lateral di...

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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...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20G06F2119/06
Inventor 孙瑞李少鹏潘勇军谢波
Owner CHONGQING UNIV
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