Calculating method of large-volume concrete cooling temperature field

Abstract

The invention discloses a calculating method of a large-volume concrete cooling temperature field. The method comprises the following steps: superposing the energy of concrete dissipated by the wall surface of a cooling water pipe onto a conventional fonctionelle; establishing a finite element governing equation of the concrete containing the cooling water pipe through a variational principle based on the composite fonctionelle; and then estimating an equivalent heat emission coefficient of a concrete contact surface based on the thickness and the heat conductivity coefficient of the cooling water pipe. The existence of the cooling water pipe is not considered during the mesh generation; sections intersected with concrete units are found out based on the positions of the cooling water pipe after the mesh is formed, thereby a cooling water pipe mesh is automatically formed. The method does not increase the difficulty in the mesh generation, and precisely considers the temperature change around the cooling water pipe. Therefore, the method is an efficient method for analyzing the cooling effect of the cooling water pipe; and the problems that the conventional methods are too big in the degree of freedom and are unable to be calculated by computers are solved.

Description

technical field [0001] The invention relates to a method for calculating the cooling temperature field of large-volume concrete, which belongs to the technical field of building structure analysis and calculation. Background technique [0002] Water pipe cooling is an important measure to control temperature in mass concrete construction, and the influence of water pipe cooling must be considered when performing simulation calculations of mass concrete structures. At present, there are mainly two methods for the research on this problem: one is the equivalent temperature rise method based on the finite element calculation of the cooling effect of the water pipe, which is currently widely used. However, this method ignores the drastic temperature changes near the water pipes, and obtains an average temperature field; the second is the fine grid algorithm, which considers the actual existence of water pipes, and uses the contact surface between concrete and water pipes as the ...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for calculating the cooling temperature field of large-volume concrete, which solves the problem that the conventional method has too much freedom and cannot be calculated by a computer

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