Steel bridge deck pavement interlayer shear fatigue behavior simulation method based on discrete elements

Abstract

The invention provides a steel bridge deck pavement interlayer shear fatigue behavior simulation method based on discrete elements. The method comprises the following specific steps of firstly, generating the asphalt pavement layer discrete element models with the same sizes and grades according to an indoor test, then generating the steel bridge deck three-dimensional discrete element models, andcombining into a steel bridge deck pavement composite test piece model; secondly, endowing the corresponding mesomechanics parameters to the mutual contact and bonding among a generated coarse aggregate unit, an asphalt mortar unit and a steel bridge deck unit according to the macromechanics parameters; and finally, controlling a loading wall body to continuously adjust the speed by utilizing anFISH language in a PFC3D to realize different forms of periodic loads to carry out fatigue shearing, and real-timely collecting the fatigue loading frequency, the shearing deformation amount and the number and paths of the interlayer crack development in the simulation process, when the shearing deformation amount reaches a limit value, ending the simulation, exporting a data result, and analyzingthe mechanism of the steel bridge deck pavement interlayer shearing fatigue damage.

Description

technical field [0001] The invention belongs to the technical field of steel bridge deck pavement engineering, in particular to a method for simulating shear fatigue behavior between steel bridge deck pavement layers based on discrete elements. Background technique [0002] Among the diseases faced by the steel deck pavement composite structure, the interlayer shear fatigue damage caused by the loose bond between the asphalt pavement and the steel bridge deck bears the brunt. increase, the delamination damage between the asphalt pavement and the steel bridge deck caused by insufficient interlayer bond strength is becoming more and more serious. This kind of damage is not a one-time shear failure, but an interlayer shear fatigue failure under long-term load , which greatly reduces the service life of the pavement. Therefore, it is more necessary to study the shear fatigue failure mechanism of the composite structure of the steel bridge deck pavement. [0003] At present, whe...

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Problems solved by technology

[0002] Among the diseases faced by the steel deck pavement composite structure, the interlayer shear fatigue damage caused by the loose bond between the asphalt pavement and the steel bridge deck bears the brunt. increase, the delamination damage between the asphalt pavement and the steel bridge deck caused by insufficient interlayer bond strength is becoming more and more serious. This kind of damage is not a one-time shear failure, but an interlayer shear fatigue failure under long-term load , which greatly reduces the service life of the pavement. Therefore, it is more necessary to study the shear fatigue failure mechanism of the composite structure of the steel bridge deck pavement

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