Method for realizing seismic reinforcement of pier by the aid of carbon fibers

A carbon fiber and carbon fiber cloth technology, used in bridge reinforcement, bridges, bridge parts, etc., can solve the problems of imperfect improvement of the overall mechanical performance of the structure, complicated process construction, etc., and achieve remarkable reinforcement effect, simple construction process, and ideal effect. Effect

Inactive Publication Date: 2012-09-12
陈兴冲 +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current bridge reinforcement project, there are reinforcement technologies such as outsourcing concrete enlarging section method, bonding steel method, and changing structural system reinforcement method, but these reinforcement methods are relatively complicated in construction and ar

Method used

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  • Method for realizing seismic reinforcement of pier by the aid of carbon fibers
  • Method for realizing seismic reinforcement of pier by the aid of carbon fibers
  • Method for realizing seismic reinforcement of pier by the aid of carbon fibers

Examples

Experimental program
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Effect test

Embodiment

[0026] A method of carbon fiber seismically reinforced bridge pier, comprising:

[0027] ① Pier body surface treatment

[0028] Grind and smooth the surface of the pier where carbon fiber is to be pasted. Determine the scope of reinforcement according to the seismic design code. Within the scope of reinforcement, if there are large unevenness on the surface or wide cracks, it should be filled with high-strength mortar containing fibers. In the case of concrete crushing at the root of the pier, the Smash the root concrete and fill it with high-strength mortar. If it is a rectangular pier, the four corners should be ground into 2-3cm rounded corners to facilitate the sticking and force bearing of carbon fiber cloth. And ensure a minimum 20cm overlap length of carbon fiber cloth on the surface of the platform to ensure that the carbon fiber at the root will not peel off under load

[0029] ② Brush primer

[0030] After the surface treatment of the pier body, a layer of primer...

experiment example

[0044] In the test, the pier before reinforcement had obvious cracks when it was loaded to 40KN, the concrete at the bottom of the pier was crushed at 80KN, and reached the ultimate horizontal bearing capacity at 91KN. If the bridge pier reinforced with carbon fiber cloth is loaded to 60KN, some carbon fibers will start to peel off, and the cap will have tiny cracks, and the maximum horizontal bearing capacity will reach 177KN. From Figure 5 The force-displacement skeleton curve diagram (dotted line is before reinforcement, and solid line is after reinforcement) can be seen: the present invention can obviously improve the seismic bearing capacity and the ductility of bridge piers.

[0045] Figure 6 is the force-displacement hysteretic curve of the unreinforced pier, Figure 7 is the force-displacement hysteresis curve of the reinforced pier. Figure 6 and Figure 7 From the comparison, it can be clearly seen that the force-displacement hysteresis curve of the reinforced ...

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Abstract

The invention relates to a method for realizing seismic reinforcement of a pier by the aid of carbon fibers. The method includes the steps: a, treating the surface of a pier body by filling fiber-containing high-strength mortar into an uneven position of the surface of the pier body and trowelling the uneven position; b, coating epoxy resin adhesives on the pier body to serve as a trowelling layer; c, pasting longitudinal carbon fiber fabrics on the pier body; d, pasting transverse carbon fiber fabrics; e, treating the root of the pier after the adhesives on longitudinal carbon fibers and transverse carbon fibers are completely solidified; and f, planting steel bars and pouring concrete into a bearing platform. Large tensile stress is resisted by pasting the longitudinal carbon fiber fabrics, development of transverse cracks is suppressed, core concrete crushing can be effectively restrained by the transverse carbon fiber fabrics, and shearing resistance is improved. A carbon fiber surface at the lapping position of the root of the pier body and the bearing platform is treated by steel plate battens, the steel bars are planted and the concrete is poured in the lapping length direction of surface carbon fibers of the bearing platform, wholeness of the pier in stress is improved, and the purpose of seismic reinforcement is achieved. The seismic reinforcement technique is simple in operational process, convenient in construction, small in occupied space and fine in reinforcement effect, and the additional load of the structure is not increased.

Description

technical field [0001] The invention belongs to the technical field of anti-seismic strengthening of engineering, and specifically relates to a bridge pier reinforced with carbon fiber, which improves the anti-seismic performance of the pier structure, thereby resisting earthquake damage. Background technique [0002] Bridges are generally built to cross valleys, rivers, or to cross certain traffic obstacles, and they play an important role in transportation. Once an earthquake occurs, bridges with insufficient earthquake resistance will be severely damaged or even collapsed, resulting in interruption of traffic, obstruction of goods delivery, and huge secondary disasters. This has been exemplified in earthquakes in recent years. However, as the main load-bearing part of the bridge, the bridge pier is the first to be tested by the earthquake when an earthquake occurs. Therefore, it is necessary to carry out seismic reinforcement for some existing bridge piers with insufficie...

Claims

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Application Information

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IPC IPC(8): E01D22/00E01D19/02
Inventor 陈兴冲丁明波吴刚范增昱张鹏翔刘伟博
Owner 陈兴冲
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