Rubber aggregate concrete beam for FRP bar structure

A technology of rubber aggregates and concrete beams, applied in truss structures, joists, girders, etc., can solve problems such as difficulty in meeting specification requirements and comfort requirements, low crack resistance, etc., to reduce black pollution and improve ultimate bearing capacity strength, improving ductility

Pending Publication Date: 2021-01-12
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

[0003] Research shows that the crack width of FRP-reinforced concrete beams under static load is wider than that of reinforced concrete beams, and the crack resistance is low

Method used

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  • Rubber aggregate concrete beam for FRP bar structure
  • Rubber aggregate concrete beam for FRP bar structure

Examples

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Example Embodiment

[0024]Examples:

[0025](1) Control the strength grade of rubber aggregate concrete. Material strength is the key to structural design, and fine control of material strength is conducive to the reliability and safety of structural design. GB 50010-2010 "Specification for Design of Concrete Structures" stipulates that when the strength grade of steel bars in reinforced concrete beams is HRB400, the concrete strength grade shall not be lower than C25. Therefore, it is necessary to find suitable methods to ensure the preparation of rubber aggregate concrete with the same strength level as ordinary concrete.

[0026](2) Determine the mixing method of rubber aggregate. There are two general design methods for the mix ratio of rubber aggregate concrete: the first is the equal volume of rubber particles to replace fine aggregate, the equal volume of rubber particles to replace coarse aggregate, and the equal volume of rubber particles to replace part of fine aggregate and part of coarse aggregat...

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Abstract

The invention discloses a rubber aggregate concrete beam for an FRP bar structure. By aiming at the problems that the crack width and deflection of an FRP bar common concrete beam are large under theaction of static loads, and the brittleness characteristic is quite remarkable during destroying, common concrete is replaced with structural rubber aggregate concrete with large deformability and excellent crack resistance in order to improve the bending performance of the FRP bar concrete beam under the action of static loads. The rubber aggregate concrete beam for the FRP bar structure comprises a steel bar frame and poured concrete. The steel bar frame comprises steel bar frame vertical bars, FRP tension bars and steel bar stirrups, hooks are arranged at the two ends of each FRP tension bar correspondingly, and the hooks and the FRP tension bars are bound in a crossed manner through glass fiber bundles or nylon ropes and sealed through epoxy resin glue. Structural rubber aggregate concrete is adopted as the concrete. The FRP bars and the structural rubber aggregate concrete are combined to form the rubber aggregate concrete beam for the FRP bar structure.

Description

Technical field[0001]The invention relates to the technical field of FRP bar concrete structures in civil engineering, and in particular to a new type of composite structure system, that is, a rubber aggregate concrete beam for FRP bar structures.Background technique[0002]The structural damage caused by corrosion of steel bars in concrete structures seriously threatens the long-term safety of reinforced concrete structures and restricts the healthy development of concrete structures. Fiber reinforced composite material ribs (Fiber Reinforced Polymer, hereinafter referred to as FRP ribs) are composed of multiple continuous long fibers (such as glass fiber, carbon fiber, aramid fiber, etc.) and a resin matrix (unsaturated polyester, polyethylene resin, polypropylene, etc.) ) It is made by mixing in a certain proportion and adding some auxiliary materials (such as initiators, accelerators, etc.) through a series of processing techniques such as pultrusion. Because FRP bars have good co...

Claims

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Application Information

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IPC IPC(8): E04C3/02E04C3/20
CPCE04C3/02E04C3/20
Inventor 赵秋红王菲刘凯
Owner TIANJIN UNIV
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