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Method for predicting FRP-concrete beam interface crack length under variable amplitude fatigue

A concrete beam, crack length technology, applied in the direction of testing material strength by applying repeated force/pulsation force, testing material strength by applying stable tension/compression, measuring devices, etc., can solve the problem that there is no effective test method for the extension length of interface cracks , There are few researches on the fatigue performance of the reinforced interface with variable amplitude, etc.

Active Publication Date: 2020-10-30
JINAN UNIVERSITY
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Problems solved by technology

At present, most of the domestic and foreign research on FRP-strengthened concrete beams is focused on statics and constant-amplitude fatigue performance, and there are few studies on the variable-amplitude fatigue performance of the reinforced interface. no valid test method

Method used

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  • Method for predicting FRP-concrete beam interface crack length under variable amplitude fatigue
  • Method for predicting FRP-concrete beam interface crack length under variable amplitude fatigue
  • Method for predicting FRP-concrete beam interface crack length under variable amplitude fatigue

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Embodiment

[0060] This embodiment discloses a method for predicting the crack length of the FRP-concrete beam interface under variable amplitude fatigue, such as figure 1 As shown, the steps are as follows:

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Abstract

The invention discloses a method for predicting an FRP-concrete beam interface crack length under a variable amplitude fatigue. The method comprises the steps of firstly applying a static load to a static load test piece, and obtaining the ultimate bearing capacity of the FRP-concrete beam during damage, designing the maximum load of constant-amplitude fatigue according to the static load bearingcapacity, applying a constant-amplitude fatigue load to the constant-amplitude fatigue test loading test piece, and obtaining a stress-fatigue life relation curve under constant-amplitude fatigue according to test data, then applying a crossed variable-amplitude fatigue load to the variable-amplitude fatigue test loading test piece for testing, and predicting the crossed variable-amplitude fatiguelife of the test piece by correcting a Miner criterion according to test data and the obtained stress-fatigue life relation curve, and finally, designing a crack propagation length prediction formula, and substituting the crossed variable-amplitude fatigue life into the formula to obtain an interface crack length prediction value of the test piece under crossed variable-amplitude fatigue. The FRP-concrete interface crack propagation length under the crossed variable-amplitude fatigue can be accurately measured.

Description

technical field [0001] The invention relates to the technical field of performance testing of FRP-strengthened concrete beams, in particular to a method for predicting the crack length of an FRP-concrete beam interface under variable-amplitude fatigue. Background technique [0002] With the continuous development of the transportation industry, the requirements for bridge roads are getting higher and higher, and some of the existing bridge roads are concrete building structures many years ago, which cannot meet the current transportation requirements after many years of service. Therefore, these Building reinforcement is imperative. Currently, Fiber Reinforced Polymer (FRP) is introduced into the reinforcement of building structures. Attaching FRP to the bottom of the beam is the main way to strengthen the concrete beam. The FRP material is pasted on the surface of the concrete beam through resin glue to form a new reinforced beam. The reinforced beam is actually loaded by ...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/32G06F30/20G06F17/18G06F119/14
CPCG01N3/08G01N3/32G06F30/20G06F17/18G01N2203/0003G01N2203/0005G01N2203/0073G01N2203/0066G06F2119/14Y02T90/00
Inventor 袁鸿罗光云曾岚刘畅
Owner JINAN UNIVERSITY
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