System and method for testing stress performance of combined bridge deck under action of eccentric load

Abstract

The invention relates to a system and a method for testing the stress performance of a combined bridge deck under the action of eccentric load. The system comprises a loading assembly, a loading tool, a combined bridge deck test piece and a ground anchor tool.The combined plate element can reflect the mechanical properties of the actual combined bridge deck; the eccentric distance is set by adjusting the relative distance between the centroids of the upper and lower end plates and the centroid of the combined plate element; the actuator drives the loading tool and the test piece to jointly deform so as to realize load transmission, and large-tonnage tension and compression loading is carried out on the combined bridge deck slab test piece by setting the loading rate and the load value of the actuator during a test; and finally, the eccentric stress performance index of the combined bridge deck can be obtained according to test data. Compared with the prior art, the test method has the advantages that the size of the combined bridge deck test piece can be greatly reduced, the stress of the test piece is clear, the test process is simple and convenient, the result is credible, the test method is suitable for eccentric tension and compression tests with different loading tonnages and different eccentric distances, the tool is simple in structure and can be repeatedly used, and the test cost is saved.

Description

technical field [0001] The invention relates to the technical field of eccentric load test devices for composite bridge decks, in particular to a system and method for testing the mechanical performance of composite bridge decks under eccentric loads. Background technique [0002] The bridge deck is the key component of the bridge that directly bears the vehicle load. Combining high-performance concrete and steel bridge decks to form composite bridge decks can improve the stiffness and fatigue resistance of bridge decks. Then, the stress of the bridge deck is complex, and it is also an important part of the bending resistance of the bridge girder. With the continuous emergence of cement-based composite materials with high mechanical properties, composite bridge deck structures are more and more used in bridges. [0003] At present, tests on the mechanical performance of composite bridge decks mainly focus on the mechanical characteristics of composite bridge deck systems, ...

AI Technical Summary

Problems solved by technology

Although there are many eccentric loading devices and methods for structural columns in the existing patents, most of them are only suitable for eccentric compression, or the loading tonnage cannot be too large due to the complexity of the device

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