Method for calculating carbonization depth of concrete beam

Abstract

The invention discloses a method for calculating the carbonization depth of a concrete beam, which comprises the following steps of S1, fitting the square root of the carbonization depth and the carbonization time of the concrete beam under the coupling action of repeated load and carbonization erosion to obtain a formula of the carbonization depth, S2, fitting the square root of the carbonization depth and the carbonization time of the concrete beam which is not subjected to fatigue damage due to carbonization erosion at the same time period to obtain the carbonization coefficient of the concrete which is not subjected to fatigue damage, S3, calculating to obtain a fatigue damage influence coefficient and a fatigue damage degree, and establishing a relational expression between the two, S4, expressing the carbonization coefficient k0 of the concrete without fatigue damage by adopting the carbonization coefficient kP in the corrected Papadakis formula, and S5, substituting into the formula in S1 to obtain a calculation formula of the carbonization depth of the concrete beam. The invention provides a method for calculating the carbonization depth of a concrete beam. The method can effectively, accurately and quantitatively calculate the carbonization depth of the concrete beam under the coupling action of repeated load and carbonization erosion.

Description

technical field [0001] The invention relates to the technical field of evaluating the carbonation depth of concrete, in particular to a calculation method for the carbonation depth of concrete beams. Background technique [0002] The concrete beams in actual operation are not only subjected to the repeated action of vehicle loads, but also to the continuous erosion of external carbon dioxide. The repeated action of the vehicle load will lead to the continuous occurrence or development of the original micro-cracks and pores inside the concrete. These pores and cracks provide a convenient channel for carbon dioxide to enter the interior of the concrete, causing fatigue damage to the concrete, thereby accelerating the carbonation process. However, the quantitative characterization of fatigue damage in concrete is still an immature field, especially for concrete beams after repeated bending and tensile stresses. [0003] Based on the fatigue damage degree defined by the residua...

AI Technical Summary

Problems solved by technology

Repeated loading at even low stress levels can lead to fatigue growth of microcracks and pores in the concrete, further accelerating the carbonation of reinforced concrete beams

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