CN103132709A - Method to replace reinforcing mesh piece with fiber reinforce plastic (FRP) ribs - Google Patents

Abstract

The invention provides a method to replace a reinforcing mesh piece with fiber reinforce plastic (FRP) ribs. The method includes the steps of confirming physical parameters of the to-be-replaced reinforcing mesh piece, choosing the FRP ribs, building a first mathematic model based on the principle that rigidity of an FRP rib mesh piece and rigidity of the reinforcing mesh piece in the same direction are identical; building a second mathematic model based on the principle that the total interval of the FRP rib mesh piece and the total interval of the reinforcing mesh piece are equal; plugging the physical parameters of the reinforcing mesh piece into the first mathematic model and the second mathematic model to obtain the physical parameters of the FRP rib mesh piece; and finishing on-site binding of the FRP rib mesh piece based on the obtained physical parameters of the FRP rib mesh piece. Rigidity equality is carried out on existing concrete reinforcement parameters to obtain the design parameters of the FRP rib, secondary design by means of repeated use of loading conditions is avoided, and quick design is achieved through simple mathematic substitution.

Description

Utilize the FRP muscle to replace the method for reinforced mesh

Technical field

The present invention relates to the arrangement of reinforcement technology of FRP muscle in concrete in the Construction of Civil Engineering process, relate in particular to a kind of method that the FRP of utilization muscle replaces reinforced mesh.

Background technology

Use at present the structure of reinforced mesh arrangement of reinforcement for saline-alkali environment, marine environment etc., due to chlorion and weather environmental attack, the durability of structure can not be guaranteed.The maintenance cost in later stage that long-term maintenance cost has caused a large amount of increases.FRP has the large characteristics of radiation hardness, corrosion resistant, specific modulus and specific strength, and the scope of application in civil engineering is more and more wider.The present invention aims to provide and a kind ofly utilizes the FRP muscle to replace reinforcing bar at above high density corrosion area to strengthen concrete method for designing.

Summary of the invention

For overcoming the existing defective of prior art, now provide a kind of FRP of utilization muscle to replace the method for reinforced mesh, this arrangement of reinforcement technology can improve the durability of concrete structure in ocean engineering, saline-alkali environment.The method is applicable to directly bear the reinforcement structure of pressure-acting, and convenient parameter calculation is quick, the save design time.

The present invention utilizes the FRP muscle to replace the method for reinforced mesh, comprises but order is not limited to following steps:

Determine the physical parameter of reinforced mesh to be replaced;

Choose the FRP muscle;

Set up the first Mathematical Modeling based on FRP muscle net sheet with the principle that the same directional stiffness of reinforced mesh equates;

Set up the second Mathematical Modeling based on FRP muscle net sheet with the principle that the total spacing of the layout of reinforced mesh equates;

With described the first Mathematical Modeling of the physical parameter substitution of described reinforced mesh and the second Mathematical Modeling, and then try to achieve the physical parameter of described FRP muscle net sheet;

Complete the on-the-spot colligation of FRP muscle net sheet based on the physical parameter of described FRP muscle net sheet of trying to achieve.

Set up described the first Mathematical Modeling by described step:

Determine the physical parameter of reinforced mesh to be replaced, described physical parameter comprises: diameter Ds, the interval S s on both direction, radical N _SAnd modulus E _s

Choose the FRP muscle, determine its modulus E _frpAnd set its physical parameter: diameter is D _frp, spacing is S _frp, radical N _frpAnd modulus E _frp

Obtain formula based on FRP muscle net sheet with the principle that the same directional stiffness of reinforced mesh equates

Wherein: the rigidity of section Ks=EsAs of reinforcing bar, the rigidity of section K of FRP muscle _frp=E _frpA _frpAnd further introduce modular ratio

Namely

For reinforced mesh, the area on each direction

For FRP muscle net sheet, the area on each direction

Set up thus described the first Mathematical Modeling:

Set up described the second Mathematical Modeling by described step:

For reinforced mesh, the spacing total length L that on each direction, reinforcing bar distributes _s=(Ns-1) Ss

For FRP muscle net sheet, the spacing total length L that the FRP muscle on each direction distributes _frp=(N _frp-1) S _frp

Set up the second Mathematical Modeling: L based on FRP muscle net sheet with the principle that the total spacing of layout on each direction of reinforced mesh equates _s=(Ns-1) Ss=L _frp=(N _frp-1) S _frp

With the physical parameter diameter Ds of described reinforced mesh, the interval S s on both direction, radical N _SAnd modulus Es respectively described the first Mathematical Modeling of substitution and the second Mathematical Modeling, and then try to achieve the physical parameter of described FRP muscle net sheet $D_{\mathrm{frp}}=\sqrt{\frac{N_S}{{\mathrm{\λ}}_E{N}_{\mathrm{frp}}}}\·D_S,$ $S_{\mathrm{frp}}=\frac{S_S(N_S-1)}{N_{\mathrm{frp}}-1},$ $N_{\mathrm{frp}}=\frac{D_S^2{N}_S}{D_{\mathrm{frp}}^2{\mathrm{\λ}}_E}.$

The present invention makes its beneficial effect that has be owing to adopting above technical scheme:

The present invention carries out the rigidity equivalence to existing steel concrete arrangement of reinforcement parameter, thereby obtains the design parameters of FRP muscle self, has avoided reusing loading condition and has carried out Secondary Design, has only realized rapid Design by easy mathematics replacement.This method obtains FRP muscle design parameters take the design parameters of existing reinforced mesh as the basis fast on the basis of the supporting capacity that fully guarantees structure, realized simultaneously the large characteristics of radiation hardness, corrosion resistant, specific modulus and specific strength.

Description of drawings

Fig. 1 is the schematic diagram of existing reinforced mesh;

Fig. 2 is the schematic diagram of FRP muscle net sheet of the present invention.

The specific embodiment

For the benefit of to the understanding of structure of the present invention, describe below in conjunction with drawings and Examples.

In conjunction with Fig. 1 and shown in Figure 2, the present invention utilizes the FRP muscle to replace the method for reinforced mesh, and its step comprises:

Determine the physical parameter of reinforced mesh to be replaced: diameter Ds, the interval S s on both direction, radical NS and modulus Es;

Choose the FRP muscle, determine its modulus E _frpAnd set its physical parameter: diameter is D _frp, spacing is S _frp, radical N _frpAnd modulus E _frp

Before and after reinforced mesh is replaced by FRP muscle net sheet, its unidirectional rigidity must equate, i.e. the rigidity of section Ks=EsAs of all reinforcing bars and the rigidity of section K of all FRP muscle in the same way in the same way _frp=E _frpA _frpEquate EsAs=E _frpA _frp, this formula can be deformed into And further introduce modular ratio ${\mathrm{\λ}}_E=\frac{E_{\mathrm{frp}}}{E_s},$ Namely $A_{\mathrm{frp}}=\frac{A_s}{{\mathrm{\λ}}_E};$

For reinforced mesh, the area on each direction

For FRP muscle net sheet, the area on each direction

Bring parameter in conjunction with modular ratio, set up thus the first Mathematical Modeling:

Then to the calculating of extracting square root of the first Mathematical Modeling both sides, and with the first Mathematical Modeling two ends simultaneously divided by

The FRP muscle diameter of trying to achieve is

To the first Mathematical Modeling both sides simultaneously divided by D _frp ², the design radical of the FRP muscle that can calculate is N _frp, its formula is $N_{\mathrm{frp}}=\frac{D_S^2{N}_S}{D_{\mathrm{frp}}^2{\mathrm{\λ}}_E}.$

For reinforced mesh, the spacing total length L that on each direction, reinforcing bar distributes _s=(Ns-1) Ss, for FRP muscle net sheet, the spacing total length L that the FRP muscle on each direction distributes _frp=(N _frp-1) S _frp, based on FRP muscle net sheet and the principle that the total spacing of the layout of reinforced mesh equates, set up the second Mathematical Modeling: L _s=(Ns-1) Ss=L _frp=(N _frp-1) S _frp, then carry out the equation conversion, obtain the spacing design objective S of FRP _frp, its design formulas is

Physical parameter based on the FRP muscle net sheet of trying to achieve is completed the on-the-spot colligation of FRP muscle net sheet, thereby draws the method for utilizing the FRP muscle to replace reinforced mesh.

The present invention carries out the rigidity equivalence to existing steel concrete arrangement of reinforcement parameter, thereby obtains the design parameters of FRP muscle self, has avoided reusing loading condition and has carried out Secondary Design, has only realized rapid Design by easy mathematics replacement.This method obtains FRP muscle design parameters take the design parameters of existing reinforced mesh as the basis fast on the basis of the supporting capacity that fully guarantees structure, realized simultaneously the large characteristics of radiation hardness, corrosion resistant, specific modulus and specific strength.

Claims (4)

1. method of utilizing the FRP muscle to replace reinforced mesh is characterized in that comprising but order is not limited to following steps:

Determine the physical parameter of reinforced mesh to be replaced;

Choose the FRP muscle;

Set up the first Mathematical Modeling based on FRP muscle net sheet with the principle that the same directional stiffness of reinforced mesh equates;

Set up the second Mathematical Modeling based on FRP muscle net sheet with the principle that the total spacing of the layout of reinforced mesh equates;

With described the first Mathematical Modeling of the physical parameter substitution of described reinforced mesh and the second Mathematical Modeling, and then try to achieve the physical parameter of described FRP muscle net sheet;

Complete the on-the-spot colligation of FRP muscle net sheet based on the physical parameter of described FRP muscle net sheet of trying to achieve.

2. the method for claim 1 is characterized in that setting up described the first Mathematical Modeling by described step:

Determine the physical parameter of reinforced mesh to be replaced, described physical parameter comprises: diameter Ds, the interval S s on both direction, radical N _SAnd modulus E _s

Choose the FRP muscle, determine its modulus E _frpAnd set its physical parameter: diameter is D _frp, spacing is S _frp, radical N _frpAnd modulus E _frp

Obtain formula based on FRP muscle net sheet with the principle that the same directional stiffness of reinforced mesh equates

Wherein: the rigidity of section Ks=EsAs of reinforcing bar, the rigidity of section K of FRP muscle _frp=E _frpA _frpAnd further introduce modular ratio

Namely

For reinforced mesh, the area on each direction

For FRP muscle net sheet, the area on each direction

Set up thus described the first Mathematical Modeling:

3. method as claimed in claim 2 is characterized in that setting up described the second Mathematical Modeling by described step:

For reinforced mesh, the spacing total length L that on each direction, reinforcing bar distributes _s=(Ns-1) Ss

For FRP muscle net sheet, the spacing total length L that the FRP muscle on each direction distributes _frp=(N _frp-1) S _frp

Set up the second Mathematical Modeling: L based on FRP muscle net sheet with the principle that the total spacing of layout on each direction of reinforced mesh equates _s=(Ns-1) Ss=L _frp=(N _frp-1) S _frp

4. method as claimed in claim 3, is characterized in that: with the physical parameter diameter Ds of described reinforced mesh, the interval S s on both direction, radical N _SAnd modulus Es respectively described the first Mathematical Modeling of substitution and the second Mathematical Modeling, and then try to achieve the physical parameter of described FRP muscle net sheet $D_{\mathrm{frp}}=\sqrt{\frac{N_S}{{\mathrm{\λ}}_E{N}_{\mathrm{frp}}}}\·D_S,$ $S_{\mathrm{frp}}=\frac{S_S(N_S-1)}{N_{\mathrm{frp}}-1},$ $N_{\mathrm{frp}}=\frac{D_S^2{N}_S}{D_{\mathrm{frp}}^2{\mathrm{\λ}}_E}.$

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