Method for testing salt spray corrosion resistance of steel wire in stress state

Abstract

The invention relates to a method for testing salt spray corrosion resistance of a steel wire in a stress state, which comprises the following steps: 1) penetrating a steel wire through a top plate and an anchor cup, and upsetting the upper end of the steel wire; 2) screwing a loading nut into a steel wire loading screw, and placing the tail end of the steel wire loading screw on a screw positioning mechanism on the lower surface of the top plate; 3) enabling a bottom plate to be aligned with the bottom ends of the steel wire and the steel wire loading screw to be inserted in, adjusting the distance between the top plate and the bottom plate by screwing the loading nut, and pre-tightening; 4) penetrating the steel wire into the anchor cup below the bottom plate, and heading the lower end of the steel wire; 5) marking the steel wire or pasting a strain gauge on the steel wire, screwing a locking nut, and loading the steel wire to 45%-70% of steel wire breaking load; and 6) finally, placing an assembled device into a salt mist box to be subjected to a salt mist test. According to the method, the loading screw is matched with the top plate and the bottom plate which are arranged in parallel to fasten the steel wire and maintain the stress state, so that the problem that the steel wire cannot maintain the stress state for a long time can be solved.

Description

technical field [0001] The invention belongs to the technical field of steel wire testing, in particular to a method for testing the salt spray corrosion resistance of steel wire under stress. Background technique [0002] Since the reform and opening up, the construction of long-span bridges in our country has entered a stage of rapid development, especially long-span cable-stayed bridges and suspension bridges are in the ascendant, and my country's bridge design and construction levels have entered the advanced ranks. But there are also some problems, one of which is the lack of durability and safety of bridge cable structures. At the same time, our country is building a conservation-oriented society. Improving the durability of engineering structures is an effective measure to save resources in engineering construction, and extending the service life of projects is the greatest resource saving. With the development of material technology, the corrosion of bridge cables i...

AI Technical Summary

Problems solved by technology

However, the traditional salt spray test method cannot simulate the stress corrosion under the complex stress conditions above the steel wire, so the test results have certain limitations for the evaluation of the cable durability of the actual bridge.

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