Establishment method of temperature field model of steel box girder bridge road system under high temperature asphalt concrete paving

Abstract

The invention provides a method for establishing a temperature field model of a steel box beam bridge road system under high-temperature asphalt concrete paving. The model comprises a paving layer (1), a steel bridge panel (2), U-shaped ribs (4) and diaphragm plates (5). An interface thermal resistor (3) is arranged between the paving layer (1) and the steel bridge panel (2) and is used for reflecting a barrier effect of an adhesive layer in an adhesive layer-paving composite structure on temperature transfer. The method comprises the following steps: acquiring the optimal interface thermal resistance by using a test-numerical simulation mixed parameter analysis method and combining a numerical optimization technology; establishing an actual bridge numerical model, setting a movable temperature load (6) to simulate the paving construction process, and calculating and analyzing the temperature field distribution condition of the steel box beam bridge road system. The method mainly depends on finite element modeling, a thermal insulation effect of the adhesive layer can be well reflected, and the paving construction process can be really simulated. Compared with field measurement, the method is simple and feasible, different working conditions can be simulated, and the temperature field distribution condition of the steel box beam bridge road system can be accurately reflected.

Description

technical field [0001] The invention relates to a method for establishing a model, in particular to a method for establishing a temperature field model of a steel box girder bridge road system under high-temperature asphalt concrete paving. Background technique [0002] Orthotropic steel box girder bridge pavement has a higher temperature during paving. For example, the paving temperature of epoxy asphalt concrete (EA) generally requires 110°C-130°C, while the paving temperature of cast asphalt concrete (GA) The temperature can be as high as 200°C-240°C. Such a high temperature, coupled with the large thermal conductivity and anisotropic effect of the steel bridge deck, will inevitably cause the steel bridge deck structure to be subjected to high temperature within the paving construction range, resulting in local temperature deformation, thus burying the early stage of the pavement layer. Hidden danger. At the same time, the temperature deformation of the steel bridge dec...

AI Technical Summary

Problems solved by technology

When building the simulation model of the steel box girder bridge pavement system, the bonding layer is too thin, which brings difficulties to the establishment of the finite element unit

However, the barrier effect of the adhesive layer on heat conduction will bring errors to the numerical calculation, which cannot be ignored

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