Testing apparatus and method for fatigue cracking of pavement on steel bridge

Abstract

The invention provides a testing apparatus for fatigue cracking of a pavement on a steel bridge. A test piece is installed on the testing apparatus. The testing apparatus is characterized by comprising a testing platform used for applying load and a testing model used for simulating stress of the test piece, wherein the testing model comprises a support base which is equipped with at least two columns, loading plates are arranged on the columns, and the loading plates are fixed with the test piece through clamps. The invention further provides a testing method for fatigue cracking of the pavement on the steel bridge. The method comprises the following steps: determining the size of the test piece according to the size of the testing platform and load limit; fixing the fabricated test piece and the loading plates together through the clamps; applying load on the testing model by using the testing platform; and predicating the technical state of a pavement layer through displacement observation, foil gauge observation and DIC digital image processing of the state of the test piece in the process of testing, and evaluating the cracking fatigue life of the pavement layer.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a test device and method for simulating the fatigue cracking state of steel bridge deck pavement under real stress conditions. Background technique [0002] The cracking and failure of long-span steel box girder bridge deck pavement has always been a difficult problem in the road industry in our country. Once the pavement materials with excellent performance in many indoor tests and excellent crack resistance are applied to the actual bridge deck pavement, serious cracks often occur. The reason is that the indoor evaluation test cannot accurately and reasonably reflect the actual stress conditions of the pavement, and the core of the problem lies in the lack of test devices that can correctly simulate the structural characteristics and deformation characteristics of the pavement and steel bridge deck. [0003] In the performance design and evaluation process of tradit...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and insufficiencies of the existing pavement fatigue cracking test device, design and develop a test device that can simulate the actual stress state of the steel bridge deck pavement, and is used to study the steel bridge deck pavement Fatigue cracking characteristics under vehicle loads, so as to evaluate the crack resistance of the pavement and predict the fatigue life of the pavement

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