Sea sand concrete beam with mixed reinforcements of fiber reinforced plastics (FRP)-steel composite bars and FRP bars and construction method thereof

Abstract

The invention discloses a sea sand concrete beam with mixed reinforcements of fiber reinforced plastics (FRP)-steel composite bars and FRP bars. The sea sand concrete beam comprises sea sand concrete, the FRP-steel composite bars, the FRP bars, erection bars and a plurality of stirrups, wherein the FRP-steel composite bars, the FRP bars, the erection bars and the stirrups are fixedly arranged in the sea sand concrete. The FRP-steel composite bars and the FRP bars are arranged at the lower end of the sea sand concrete, and the erection bars are arranged at the upper end of the sea sand concrete. The lengths of the FRP-steel composite bars and the FRP bars are arranged along the length of the sea sand concrete. The stirrups are evenly and fixedly connected to the outer surfaces of the FRP-steel composite bars, the FRP bars and the erection bars in a bound mode in the direction of the lengths of the FRP-steel composite bars and the erection bars. The FRP-steel composite bars comprise steel bars and FRP fiber cloth, wherein the outer surfaces of the steel bars are wrapped with the FRP fiber cloth. The FRP fiber cloth is bonded with the sea sand concrete. The invention further discloses a construction method of the sea sand concrete beam with the mixed reinforcements of the fiber reinforced plastics (FRP)-steel composite bars and the FRP bars. According to the sea sand concrete beam with the mixed reinforcements of the fiber reinforced plastics (FRP)-steel composite bars and the FRP bars and the construction method thereof, sea sand does not need to be subjected to desalting treatment, the strength is high, and the bearing property is good.

Description

technical field [0001] The invention belongs to the field of building engineering structures, in particular to a sea-sand concrete beam with mixed reinforcement of FRP-steel composite bars and FRP bars and a construction method thereof. Background technique [0002] With the continuous development of science and technology in our country and the breakthroughs in the field of construction engineering, more and more new building materials have entered people's lives. Although my country has a large population base, the per capita share of natural resources is very small. As a component of the structure, concrete plays an indispensable role in the construction of projects, and river sand is one of the aggregate components for preparing concrete. It mainly comes from the excavation of riverbeds and mountains on land. In recent years, a large amount of mining of river sand has caused serious damage to the ecological environment of the riverbed and its surroundings. The resources...

AI Technical Summary

Problems solved by technology

However, the traditional treatment methods for sea sand desalination and desalination are extremely cumbersome, and the desalination treatment takes a long time and is inefficient, wasting a lot of fresh water resources, human and financial resources

[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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