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A method of pasting frp cloth to enhance the impact resistance of concrete filled steel pipe piers

A steel pipe concrete, anti-impact technology, applied in the direction of bridges, bridge materials, bridge construction, etc., can solve the problems of electric corrosion of steel pipes, affecting the reinforcement effect, etc., to achieve the effect of ensuring normal work, reducing deflection, and avoiding building collapse

Active Publication Date: 2022-01-04
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the concrete-filled steel tube pier is in an outdoor environment. If the CFRP cloth is directly wound and pasted, affected by water vapor, the carbon fiber in the CFRP cloth is likely to cause electrical corrosion to the steel pipe, thereby affecting the reinforcement effect.

Method used

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  • A method of pasting frp cloth to enhance the impact resistance of concrete filled steel pipe piers
  • A method of pasting frp cloth to enhance the impact resistance of concrete filled steel pipe piers
  • A method of pasting frp cloth to enhance the impact resistance of concrete filled steel pipe piers

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Such as Figure 1-3 As shown, the concrete-filled steel pipe pier 5 (φ600mm, steel pipe wall thickness 12mm) is at its location, and the maximum impact force that may be suffered comes from the impact of an 8.5t car out of control. The finite element program is used to calculate the When the vehicle 9 collides at a speed of 140km / h, the impact of the concrete filled steel tube pier 5.

[0046] In this embodiment, after calculation, under the impact of a vehicle 9 with a weight of 8.5t at a speed of 140km / h, the pier 5 does not produce plastic deformation, and only a small deflection occurs at the collision position 8, so the middle layer of CFRP cloth uses 1 layer, the winding positions are at the top 6 of the column, the foot of the column 7 and the collision position 8, and the winding width of the hybrid FRP cloth at the three places is 500mm. The column foot 7 is the part where the concrete-filled steel pipe pier 5 is connected to the lower foundation 13, and the c...

Embodiment 2

[0055] Such as Figure 1-3 As shown, the concrete-filled steel pipe pier 5 (φ600mm, steel pipe wall thickness 12mm) is at its location, and the maximum impact force that may be suffered comes from the impact of a 40t car out of control. Using the finite element program, the vehicle 9 with a weight of 40t is calculated at 140km / h The impact situation of the concrete filled steel tube pier 5 under the impact of speed h.

[0056] In this embodiment, it is calculated that under the impact of a vehicle 9 with a weight of 40 t at a speed of 140 km / h, the concrete-filled steel pipe pier 5 is seriously damaged, and cannot effectively support the superstructure. The impact situation of the concrete-filled steel pipe pier 5 when the mass of the vehicle 9 with a weight of 40 t is reduced to 20 t is calculated by simulation. When the impact occurred, the concrete-filled steel pipe pier 5 was not severely damaged. After the impact, the concrete-filled steel pipe pier 5 still had a support...

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Abstract

The invention discloses a method for enhancing the impact resistance of concrete-filled steel tube bridge piers by pasting FRP cloth. The impact force received by the CFST pier and the plastic deformation under the impact force, according to the plastic deformation of the CFST pier, the interlayer mixed FRP fabric is wound and pasted on the column top, column foot and collision action position of the CFST pier. at least one. The invention can enhance the collision damage resistance performance of the bridge pier, reduce the local plastic deformation of the bridge pier after the collision occurs, ensure the normal operation of the upper structure of the bridge pier, and avoid the possible collapse of the building and casualties after the impact. The interlayer mixed FRP cloth used in the present invention is only partially wound and pasted on the concrete-filled steel tube pier, which can save the consumption of the FRP cloth while achieving the enhancement effect, and is economical and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of improving the performance of existing structures, and in particular relates to a method for pasting FRP cloth to enhance the anti-collision performance of concrete filled steel tubular bridge piers. Background technique [0002] Concrete-filled steel pipe piers, compared with traditional reinforced concrete piers, have the advantages of high bearing capacity, good ductility, light weight, convenient construction, and significant comprehensive economic benefits. The North Railway Station Bridge and so on all adopt steel pipe concrete piers. [0003] During its service period, the piers of highway bridges may be subjected to various collision loads, especially vehicle collisions. Bridge piers are important load-bearing components of bridges and some elevated structures. Once damaged or deformed, it will affect the transmission of the vertical load of the bridge or elevated structure in a local or even overall range,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/02E01D101/40
CPCE01D19/02E01D2101/40
Inventor 胡波刘宇洋
Owner HEFEI UNIV OF TECH
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