Auxiliary loading device for simulating stress diffusion effects of pavement layer and application method

Abstract

The invention discloses an auxiliary loading device for simulating stress diffusion effects of a pavement layer and an application method. The auxiliary loading device comprises a load distribution system, a load transfer system and a viscoelastic contact simulation system, wherein the load transfer system comprises a plurality of load transfer devices; and the load transfer device comprises a connecting roof, a force transfer spring with a different stiffness coefficient, a hinged bottom plate, a connecting chute and a connecting sliding bar. The application method based on the above auxiliary device comprises steps: (1) the stiffness coefficient of each force transfer spring is determined; (2) the auxiliary device is assembled; and (3) fatigue loading is carried out. According to the auxiliary loading device for simulating the stress diffusion effects of the pavement layer and the method, the diffusion effects of the pavement layer on the fatigue load can be well simulated, a test condition is simplified, the fatigue test result obtained based on the auxiliary loading device can well consider the influences of pavement stress diffusion effects on the test result, and the obtainedtest result is made to be closer to the actual operation condition.

Description

technical field [0001] The invention relates to a steel bridge structure fatigue test instrument, in particular to an auxiliary loading device and an application method for simulating the stress diffusion effect of a pavement layer. Background technique [0002] Orthotropic steel bridge decks have been widely used in long-span cable system bridges due to their light weight, high strength, and high flexural and torsional stiffness. However, due to its complex structure, under the influence of factors such as wheel load, welding residual stress, and welding defects, the weld seam is extremely prone to fatigue and cracking. Fatigue cracks are one of the main problems faced by the current bridge engineering community. They are unavoidable and difficult to detect in the early stage, and even lead to bridge collapse accidents in severe cases. Scholars at home and abroad have carried out a large number of experimental studies on the fatigue performance of steel bridge deck welds, ...

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Problems solved by technology

[0005] Purpose of the invention: The present invention provides an auxiliary loading device for simulating the stress diffusion effect of the pavement layer, which solves the problem that the laboratory is difficult to lay asphalt concrete and repeatedly rolls; at the same time, it solves the problem that the existing system equipment requires larger power, uneconomical problems

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