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Steel bridge deck slab corrosion fatigue coupling test method and device for same

A steel bridge deck, corrosion fatigue technology, applied in measuring devices, weather resistance/light resistance/corrosion resistance, and optical devices to transmit sensing components, etc. Effective and reliable test data

Active Publication Date: 2019-10-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The present invention aims to solve the problem that the current structural performance test device for orthotropic steel bridge decks usually only considers the effect of a single factor of fatigue and does not consider the coupling effect of corrosion fatigue, resulting in inaccurate results, and proposes a method that fully considers the coupling effect of corrosion fatigue, A device that can well simulate the corrosion of steel in a real atmospheric environment, a coupling test method for steel bridge deck corrosion fatigue and its device

Method used

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  • Steel bridge deck slab corrosion fatigue coupling test method and device for same
  • Steel bridge deck slab corrosion fatigue coupling test method and device for same
  • Steel bridge deck slab corrosion fatigue coupling test method and device for same

Examples

Experimental program
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Effect test

Embodiment 1

[0033] With reference to accompanying drawing, the test method of steel bridge deck corrosion fatigue coupling test device of the present invention may further comprise the steps:

[0034] 1) Install the fabricated segmental orthotropic steel bridge deck full-scale model in the laboratory, arrange fiber grating sensors, and paste filter paper: the steel bridge deck is manufactured and processed in the factory and transported back to the fatigue laboratory for installation. Orthotropic steel bridge decks fixed in the fatigue laboratory. After the installation is completed, fiber grating strain sensors are arranged at equal intervals of 2mm within 30cm of the weld to monitor the corrosion near the weld of the steel bridge deck; secondly, the stress monitoring position is determined according to the hot spot extrapolation method and the fiber grating strain sensors are arranged And the fiber grating temperature sensor, in order to prevent the sensor from being corroded, apply epo...

Embodiment 2

[0040] With reference to accompanying drawing, realize the device of the test method described in embodiment 1, comprise hydraulic jack 34, test loading beam 35, rubber support 20, transmission pipeline support 13, pipeline 3, infrared lamp tube 24, water tank 1, booster pump 6. It is characterized in that: the hydraulic jack 34 acts on the test loading beam 35, and a single rubber support 20 with an area of ​​200mm×300mm is placed between the test loading beam 35 and the test model to simulate a single tire passing through the pavement Wheel load; the transmission pipeline support 13 is fixed on the ground parallel to the bridge deck model weld seam by connecting bolts 16, the pipeline 3 equipped with the sprayer 25 is fixed on the transmission pipeline support 13 by a clamp, and the transmission pipeline support is below the pipeline 3 Binding plank 23 on 13, infrared lamp tube 24 is installed on the plank 23; Place a water tank 1 that 3.5% sodium chloride solution 2 is house...

Embodiment 3

[0053] In this example, a Q345qd steel orthotropic steel bridge deck foot of Q345qd steel with a thickness of 14 mm for the cover plate, a thickness of 12 mm for the lower wing, a thickness of 10 mm for the diaphragm, a size of U-rib of 300 mm×280 mm×8 mm, and a center distance of U-rib of 600 mm is selected. The scale model is used as the experimental object to explain the design idea of ​​the test device and the corrosion fatigue coupling scheme.

[0054] 1. Design and implementation of corrosion fatigue test device:

[0055] ⑴Design and production of spray system

[0056] The spray system mainly includes a water tank, a booster pump, a ppr water pipe with a diameter of 20mm, an ordinary fire pipe with a diameter of 25mm for supporting the ppr pipe, and an intelligent control system (for controlling the time of spraying). After the position of the orthotropic steel bridge deck is determined, the water pipe support pipe is installed, and the position of the support pipe is a...

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Abstract

The invention discloses a steel bridge deck slab corrosion fatigue coupling test method. The steel bridge deck slab corrosion fatigue coupling test method comprises the steps of: 1) installing a manufactured sectional orthotropic steel bridge deck slab full-scale model, arranging fiber grating sensors and adhering filtering paper in a laboratory; 2) establishing a corrosion-fatigue coupling effectprocess time matching relationship; 3) installing a sprayer corrosion device; 4) designing a sectional orthotropic steel bridge deck slab full-scale model corrosion-fatigue coupling test; 5) and acquiring data of the sectional orthotropic steel bridge deck slab full-scale model corrosion-fatigue coupling test. The invention further comprises a device for implementing the steel bridge deck slab corrosion fatigue coupling test method. The steel bridge deck slab corrosion fatigue coupling test method solves the problem of indoor accelerated corrosion of the sectional orthotropic steel bridge deck slab full-scale model, fully considers the coupling effect, of a corrosive medium and alternating stress, which is closer to an environment in which an orthotropic steel bridge deck slab in servicelocates, and has valid and reliable test data; meanwhile, the device is simple and feasible in operation, convenient to operate, low in cost and easy to popularize.

Description

technical field [0001] The present invention and a steel bridge deck corrosion fatigue coupling test method and device thereof [0002] technical background [0003] In the welded structure of orthotropic steel bridge deck, the joints between the steel bridge deck and the longitudinal stiffeners and diaphragms are connected by a large number of weld structures, the structural structure is complex, and the weld toe area of ​​the welded structure has different geometric dimensions. Continuous, the stress near it changes greatly, and there is stress concentration at the weld toe. Under the direct action of traffic loads, the welded joints of orthotropic steel deck decks are prone to structural damage. The corrosion fatigue failure of orthotropic steel bridge decks is the phenomenon of fatigue fracture under the coupled action of alternating stress and corrosive medium. The present invention is described by taking an orthotropic steel bridge deck as an example. The corrosion f...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N3/56G01N3/06G01D5/26
CPCG01D5/268G01N3/068G01N3/56G01N17/00G01N17/006G01N2203/0005G01N2203/0073G01N2203/024G01N2203/0641G01M5/0025G01M5/0041G01M5/0091G01M11/083G01N3/32
Inventor 叶肖伟陈织文钱昕何余良
Owner ZHEJIANG UNIV
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