CN-122021096-A - Steel structure temperature effect control method based on coatings with different thermal properties

Abstract

The invention relates to a steel structure temperature effect control method based on coatings with different thermal properties, which comprises the steps of S1, numerical simulation of a temperature field, S2, surface partitioning of a steel member, S3, coating mapping, S4, and coating effect verification. According to the invention, the three-dimensional temperature field under the effect of sunlight is accurately simulated, and the surface of the steel structure is subjected to zoning and coating scheme optimization, so that the temperature difference of the steel structure under the sunlight condition can be remarkably reduced, the deformation caused by uneven temperature is reduced, and the stress safety of the structure in the construction process and the subsequent service process is ensured.

Inventors

• ZHU JINSONG
• LU JUNXIONG
• Gao Change
• SUN YADAN

Assignees

• 天津大学

Dates

Publication Date

20260512

Application Date

20251203

Claims (4)

1. 1. A steel structure temperature effect control method based on coatings with different thermal properties is characterized by comprising the following steps: S1, performing numerical simulation on a temperature field, namely modeling and defining the outer surface of the structure by using finite element computing software ABAQUS according to the structure by using a four-node heat transfer quadrilateral shell unit DS4, defining parameters such as solar radiation intensity, wind speed, structural material radiation absorptivity and the like by using a FILM subprogram, inputting the thermal performance parameters of the steel structure into a model, defining the solar radiation condition of each outer surface by using DFLUX subprograms based on a three-dimensional shielding algorithm, and realizing the refined simulation on the three-dimensional temperature field of the arch rib under the action of sunlight; S2, partitioning the surface of the steel member, namely introducing a member surface partitioning mechanism, and partitioning the surface of the member according to different angles of external normal vectors of the surface of the steel member; S3, coating mapping, namely introducing a measurement index after mass data of the finite element simulation temperature field is processed through the python script: ; ; Wherein: For each of the zone temperatures representative value, The script automatically screens the moment with the maximum measurement index, and maps each subarea temperature set to a radiation absorptivity set of the thermal insulation coating according to linearity; S4, verifying the coating effect, namely carrying the coating thermal performance parameters determined by each partition into DFLUX subprograms, and obtaining a steel structure temperature field result controlled by using the coating through finite element simulation.
2. 2. The method for controlling the temperature effect of a steel structure based on different thermal performance coatings according to claim 1, wherein the ABAQUS subroutine simulates the temperature load and the temperature effect generated by 24h sunlight.
3. 3. The method for controlling the temperature effect of the steel structure based on the coating with different thermal properties according to claim 1, wherein the python language compiling script is used for carrying out secondary development on an ABAQUS post-processing part, the python language is used for carrying out the ABAQUS post-processing part, extracting the simulation result of the temperature field language and the temperature effect of each partition, and achieving the purposes of automatically classifying data, calculating and outputting a measurement index.
4. 4. The method for controlling the temperature effect of the steel structure based on the coating with different thermal properties according to claim 1, wherein the partition of S2 comprehensively considers the relationship between the external normal vector angle of the surface of the steel member and the 24h solar position change to cope with different direct solar radiation surfaces at different moments.

Description

Steel structure temperature effect control method based on coatings with different thermal properties Technical Field The invention belongs to the technical field of steel structure safety, and particularly relates to a steel structure temperature effect control method based on coatings with different thermal properties. Background Along with the rapid development of modern engineering technology, steel structures are widely applied to the fields of high-rise buildings, large-span space structures, industrial plants, large-span bridges and the like due to the advantages of light weight, high strength, convenient construction, high recycling rate and the like. However, the steel has large heat conductivity coefficient and small specific heat, is extremely sensitive to external temperature change, and particularly in a complex service environment, the structural performance is easily affected by temperature. Under the action of sunlight load, solar radiation received by the surface of the steel structure is unevenly distributed due to differences of orientation, shielding and surface optical properties, so that a remarkable uneven temperature field is formed on the member, the uneven temperature field not only causes additional deformation of the structure, such as beam end displacement, cylinder inclination and overall deflection increase, but also generates larger temperature self-stress in the member, and connection looseness, local buckling and fatigue cracks can be caused by long-term action, so that the structural safety and the use function are seriously threatened. Aiming at the problems, the invention provides a steel structure temperature effect control method based on a surface function coating. Disclosure of Invention The invention aims to overcome the defects of the prior art, provides a steel structure temperature effect control method based on coatings with different thermal properties, obtains structure temperature field distribution by establishing a three-dimensional sunlight-convection-radiation coupling thermal analysis model, and provides a bridge surface partition criterion and each partition coating scheme based on the structure temperature field distribution, so as to realize active adjustment of solar radiation absorption and long wave radiation heat dissipation, weaken uneven temperature fields of the structure, reduce generated internal stress and ensure the safety and durability of the steel structure in a whole life cycle. The invention solves the technical problems by the following technical proposal: a steel structure temperature effect control method based on coatings with different thermal properties comprises the following steps: S1, performing numerical simulation on a temperature field, namely modeling and defining the outer surface of the structure by using finite element computing software ABAQUS according to the structure by using a four-node heat transfer quadrilateral shell unit DS4, defining parameters such as solar radiation intensity, wind speed, structural material radiation absorptivity and the like by using a FILM subprogram, inputting the thermal performance parameters of the steel structure into a model, defining the solar radiation condition of each outer surface by using DFLUX subprograms based on a three-dimensional shielding algorithm, and realizing the refined simulation on the three-dimensional temperature field of the arch rib under the action of sunlight; S2, partitioning the surface of the steel member, namely introducing a member surface partitioning mechanism, and partitioning the surface of the member according to different angles of external normal vectors of the surface of the steel member; S3, coating mapping, namely introducing a measurement index after mass data of the finite element simulation temperature field is processed through the python script: ; ; Wherein: For each of the zone temperatures representative value, The script automatically screens the moment with the maximum measurement index, and maps each subarea temperature set to a radiation absorptivity set of the thermal insulation coating according to linearity; S4, verifying the coating effect, namely carrying the coating thermal performance parameters determined by each partition into DFLUX subprograms, and obtaining a steel structure temperature field result controlled by using the coating through finite element simulation. Furthermore, the ABAQUS subroutine simulates the temperature load, temperature effects, produced by 24h sunlight. And the python language compiling script carries out secondary development on the ABAQUS post-processing part, the python language is used for carrying out the ABAQUS post-processing part, the temperature field language temperature effect simulation result of each partition is extracted, and the purposes of automatically classifying data, calculating and outputting a measurement index are realized. And moreover, the partition of S2 comprehensively