Experimental device for the durability of frp bars under the coupling effect of tensile stress and environment

Abstract

The invention provides an experimental device of FRP rib durability under stretching stress and environment coupling effect. The experimental device comprises a pull-down plate (1), a positioning plate (7), a pull-up plate (2) positioned between the pull-down plate (1) and the positioning plate (7), four pull rods (3) penetrating through the pull-up plate (20) and arranged between the pull-down plate (1) and the positioning plate (7) through a positioning nut (4), a pair of universal spherical hinges (8) with threaded rods, a sample loading sleeve (10), a glass tube (13) and a temperature controller (15), wherein a thrust augmentation nut (5) is arranged at the bottom of the pull-up plate (2); a spring (6) is arranged between the pull-up plate (2) and the positioning plate (7); holes are respectively formed in the middle parts of the pull-down plate (1) and the pull-up plate (2); the pair of universal spherical hinges (8) with the threaded rods respectively penetrate through the holes in the middle parts of the pull-down plate (1) and the pull-up plate (2) and are connected with the sample loading sleeve (10); a stress sensor (9) is arranged between the universal spherical hinges (8) and the pull-down plate (1); the stress sensor (9) is connected with a data collector (16); the glass tube (13) is connected with the temperature controller (15). The experimental device is high in precision, adjustable in stress level, uniform in stress distribution during the process of applying load for a long time, good in continuity, convenient in temperature control and high in reliability.

Description

technical field [0001] The invention relates to the field of research on the durability of FRP tendons, in particular to a multi-factor durability test method and device for FRP tendons under the coupled action of tensile stress and environment. Background technique [0002] Reinforced concrete structure is widely used in civil engineering, construction and military industry because of its low price, simple construction and excellent performance. However, iron and steel resources are limited, and reinforced concrete structures are facing steel corrosion problems in western salt lakes, South China Sea and offshore projects, which seriously affect the service life of concrete structures. Fiber Reinforced Polymer rebars (FRP rebars for short) have the characteristics of high tensile strength, light weight, non-conductivity, and corrosion resistance, and have become a hot research topic in the engineering field. [0003] FRP bars do not have the corrosion problem of steel bars,...

AI Technical Summary

Problems solved by technology

However, the existing research rarely considers the influence of load stress and environmental coupling on the durability of FRP bars, mainly because the tensile strength of FRP bars is high, and the coupling of stress and environment is difficult to achieve

Some studies use FRP bars to drop heavy objects to apply loads, and put the whole device into a large environmental chamber to achieve coupling. The heavy objects required to achieve the stress level are large in size, and the stress level is difficult to control under the action of buoyancy. In addition, the loading device is in the Easy to damage in corrosive environment, short service life, high cost and low precision

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