Fatigue loading device for reinforced concrete duration test

Abstract

The invention discloses a fatigue loading device for a reinforced concrete duration test, which comprises a touch screen, a controller, an electric hydraulic pump, an electromagnetic reversing value and a loading component; a hydraulic jack is fixed on the inner side of a baffle of the loading component and a pressure sensor is fixed on the inner side of the other baffle, a plurality of parallel sliding plates capable of sliding and a specimen box consisting of a backing plate with four points being bent and a rubber box are arranged between the two baffles, and specimens are arranged in the specimen box; the touch screen, the controller, the pressure sensor, the electric hydraulic pump and the electromagnetic reversing valve are connected through data cables; and the hydraulic jack is communicated with the electromagnetic reversing valve and the electric hydraulic valve through pipelines. The device can simulate the real working condition that in an actual project, fatigue load, chemical corrosion, dry and wet cycles or freezing-thawing cycles jointly act on concrete components, so that the data obtained by a laboratory has a higher reference value to projects.

Description

technical field [0001] The invention relates to the research and test of the durability performance of reinforced concrete in laboratories and projects under the coupled action of multiple factors, and more particularly relates to a fatigue loading device for reinforced concrete under the coupled action of freeze-thaw cycle and salt solution erosion. Suitable for fatigue testing of reinforced concrete under conditions of freeze-thaw cycles and aggressive saline solutions. Background technique [0002] Under service conditions, reinforced concrete bears fatigue loads in many occasions, especially highway pavements, bridge decks, railway sleepers, airport pavement, etc. have high requirements for the fatigue performance of reinforced concrete materials. At the same time, the fatigue load will also promote the accumulation of corrosion damage to reinforced concrete by aggressive media, thereby accelerating the fatigue failure of reinforced concrete materials. Studies have show...

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Problems solved by technology

However, due to the dependence of fatigue on time, the load spectrum used in the analysis and test must not only give the size of the load valley and peak, but also must give the time increment of the load from the peak (valley) value to the valley (peak) value, if If there is a load holding time, the load and its holding time must be added to the load spectrum, and the persistent load cannot be simply ignored like the conventional fatigue load

[0004] Due to the dependence of fatigue on time, even under the coupling effect of various factors, the period of this kind of test is also very long. If manual loading and unloading is used, it will be a very large amount of labor, and it is difficult to ensure that the load spectrum according to the design The accuracy of loading required by the

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