Hybrid FRP (Fiber Reinforced Plastics)-steel composite bar sea sand concrete beam

Abstract

The invention discloses a hybrid FRP (Fiber Reinforced Plastics)-steel composite bar sea sand concrete beam, which comprises sea sand concrete, and a plurality of upper composite bars, a plurality of lower composite bars and a plurality of hoops fixedly arranged in the sea sand concrete. The hoops are uniformly fixed and tied on the outer surfaces of the upper composite bars and the lower composite bars along length directions of the upper composite bars and the lower composite bars; the upper composite bars and the lower composite bars are respectively arranged on the upper end and the lower end of the bar sand concrete, and comprise reinforcing steel bars and FRP fiber cloth coating the outer surfaces of the reinforcing steel bars; the FRP fiber cloth of each upper composite bar is made of the same material or different materials; the FRP fiber cloth of the plurality of lower composite bars adopts at least two materials; the FRP fiber cloth is adhered with the sea sand concrete; the FRP fiber cloth of the lower composite bars comprises at least two of carbon fiber cloth, glass fiber cloth, basalt fiber cloth and aramid fiber cloth. The hybrid FRP-steel composite bar sea sand concrete beam provided by the invention has no need to desalt sea sand, and has good strength and a bearing performance.

Description

technical field [0001] The invention belongs to the field of building engineering structures, in particular to a hybrid FRP-steel composite bar sea-sand concrete beam. Background technique [0002] With the rapid development of my country's economy, the amount of concrete has remained high for many years. According to statistics, the annual output of concrete in my country has exceeded 50% of the world's annual output of concrete for many years. As the fine aggregate of concrete, the main source of sand is river However, because the supply of river sand is limited by resources and the environment, it has been unable to fully meet the needs of engineering construction. For a long time, the massive exploitation of river sand in land river beds and mountains has caused serious ecological and environmental problems. Drawing on the experience of Japan and other developed countries, applying sea sand with properties equivalent to river sand to civil engineering can greatly relieve...

AI Technical Summary

Problems solved by technology

[0003] According to statistics, more than 50% of all buildings in developed countries such as the United Kingdom, the United States, and Japan need to be repaired and reinforced. However, in many of these buildings that need to be reinforced and repaired, the bearing capacity of the beams is reduced due to the corrosion and damage of the steel bars, which makes the houses in danger of collapsing

[0004] FRP bars (Fiber Reinforced Plastics Bars fiber composite materials) have the advantages of corrosion resistance, high tensile strength, low density, light weight, good electromagnetic insulation, and good vibration damping performance, but there are also disadvantages such as material brittleness and high price.

The elastic modulus of existing FRP bars (except high-strength CFRP) is lower than that of steel bars, and its stress-strain relationship is a straight line. When it is used alone in concrete beam structures, FRP bars are prone to brittle failure and in The problem of excessive crack width and deflection in the service state greatly affects the bearing and service performance of FRP reinforced concrete members, and greatly limits the promotion and application of FRP reinforced concrete members in the field of civil engineering

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