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

A technology of diffusion and loading devices, which is applied in the direction of measuring devices, using repeated force/pulsation force to test the strength of materials, instruments, etc., can solve the problems of uneconomical, high power, difficult to achieve repeated rolling of asphalt concrete, etc., to achieve Effects of improving precision and simplifying test conditions

Active Publication Date: 2019-04-30
HOHAI UNIV
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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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  • Auxiliary loading device for simulating stress diffusion effects of pavement layer and application method
  • Auxiliary loading device for simulating stress diffusion effects of pavement layer and application method
  • Auxiliary loading device for simulating stress diffusion effects of pavement layer and application method

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Embodiment Construction

[0047] see Figure 1 to Figure 10 , the auxiliary loading device for simulating the stress diffusion of pavement layers according to an embodiment of the present invention includes a load distribution system, a load transfer system and a viscoelastic contact simulation system connected in sequence.

[0048]The load distribution system includes a horizontal load distribution beam 1 capable of distributing loads to the load transfer system, and is provided with several vertical and horizontal stiffeners.

[0049] The load transfer system includes an odd number of laterally connected load transfer devices 2 in sequence, and each load transfer device 2 includes a connecting top plate 21 connected to the load distribution beam, a hinged bottom plate 22 connected to the viscoelastic contact simulation system, and a connecting top plate 21 and The force-transmitting elastic member 23 between the hinged base plates 22 is preferably a force-transmitting spring. The stiffness coefficien...

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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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N3/02
CPCG01N3/02G01N3/32G01N2203/0005G01N2203/0073
Inventor 王秋东吉伯海叶枝傅中秋
Owner HOHAI UNIV
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