Steel structure construction optimization method under plateau sunshine environment

Abstract

The invention relates to the technical field of building construction, in particular to a steel structure construction optimization method in a plateau sunshine environment, which comprises the following steps: establishing a thermal analysis finite element model of a steel structure in the plateau sunshine environment; based on the thermal analysis finite element model of the steel structure in the plateau sunshine environment, simulating a temperature field distribution rule of the steel structure in the plateau area in the sunshine environment; and the construction time of the steel structure in the plateau sunlight temperature environment is determined by simulating temperature field distribution and time-varying characteristics of the steel structure in the plateau sunlight temperature environment based on the thermal analysis finite element model. The problems that in the prior art, temperature distribution and change rules of the steel structure in the plateau alpine region are not accurately predicted, and construction time is not scientifically selected can be solved.

Description

Technical Field

[0001] The present application relates to the field of building construction technology, and in particular to a method for optimizing steel structure construction in a plateau sunshine environment. Background Art

[0002] With the widespread application of steel structures in construction projects, especially in high-altitude and cold areas, the judgment of steel structure construction temperature and time has become an important factor affecting project quality and construction progress. The special climatic conditions in plateau areas, such as strong solar radiation, large temperature differences between day and night, and thin air, cause the temperature distribution and changes of steel structures to be highly time-varying and accidental. In this context, the research and development of calculation methods for temperature loads in steel structure construction, especially its applicability in high-altitude and cold areas, has become an important topic in the design and construction of steel structure projects.

[0003] At present, most of the research on temperature loads of steel structure construction focuses on the analysis of temperature changes under conventional environments. The combination of numerical simulation and on-site monitoring has achieved some results. Existing technologies consider the temperature distribution and change laws of steel structures under various physical effects such as thermal radiation and convection heat transfer through finite element analysis and heat conduction equations. Especially under conventional climatic conditions, existing studies have provided a relatively complete temperature load calculation method and construction time prediction model for the engineering design of steel structures.

[0004] Although existing technologies have made certain contributions to temperature analysis of steel structures, they have not been able to fully solve the problem of accurately predicting the temperature distribution and variation of steel structures in high-altitude and cold regions, especially in environments with large sunshine intensity and temperature fluctuations. Due to the inability to comprehensively consider the coupling of multiple environmental factors, existing technologies have great uncertainty in judging the appropriate construction temperature and construction time, especially in plateau areas with special climate and relatively few research results, which leads to inaccurate temperature load values ​​during construction, affecting construction quality and subsequent maintenance. Summary of the invention

[0005] This application provides a method for optimizing steel structure construction under high-altitude sunshine conditions, which solves the problems of inaccurate prediction of temperature distribution and change rules of steel structures in high-altitude cold areas and unscientific selection of construction time in the prior art. This application provides the following technical solutions:

[0006] In a first aspect, the present application provides a method for optimizing steel structure construction under a plateau sunshine environment, the method comprising:

[0007] Establish a thermal analysis finite element model for steel structures under plateau sunshine environment;

[0008] Based on the thermal analysis finite element model of steel structure under the sunshine environment in the plateau, the temperature field distribution law of steel structure under the sunshine environment in the plateau area is simulated;

[0009] Based on the thermal analysis finite element model, the temperature field distribution and time-varying characteristics of the steel structure under the plateau sunshine environment are simulated to determine the construction time of the steel structure under the plateau sunshine temperature environment.

[0010] In a specific implementation scheme, establishing a thermal analysis finite element model of a steel structure under a plateau sunshine environment includes:

[0011] Use CAD software to extract engineering drawing information of steel structures, generate 3D geometric models, determine the 3D coordinates of nodes, and classify and label rods of different cross-sectional sizes;

[0012] Generate a 3D geometric model through the scanning command and export it to IGES file format as input data for subsequent meshing;

[0013] Load the exported IGES file in the HYPERMESH software and perform geometry cleanup, including repairing the intersection and coincidence problems between faces and lines, splitting faces, joining faces, and checking geometric integrity to ensure that the model has no openings or overlaps.

[0014] In a specific implementation scheme, the establishment of a thermal analysis finite element model of a steel structure under a plateau sunshine environment further includes:

[0015] In HYPERMESH software, different meshing rules are used to mesh nodes, bars, plate and shell elements, and surface effect elements separately to ensure that the mesh size matches the thermal analysis requirements;

[0016] Perform quality checks on the initial mesh and optimize low-quality elements to ensure that element shape, side length ratio, and angle meet standards.

[0017] In a specific implementation scheme, the establishment of a thermal analysis finite element model of a steel structure under a plateau sunshine environment further includes:

[0018] In the finite element calculation software, import the optimized mesh data output by HYPERMESH, and define the material parameters for each type of unit according to the thermal analysis requirements;

[0019] The plate and shell elements are coupled with the surface effect elements to simulate the overall heat transfer characteristics of the steel structure and complete the construction of the thermal analysis finite element model.

[0020] In a specific implementation scheme, the thermal analysis finite element model of the steel structure under the plateau sunshine environment simulates the temperature field distribution law of the steel structure under the sunshine environment in the plateau area, including:

[0021] Select the material of the steel structure as Q355B, define the material properties, and describe the heat conduction behavior of the steel structure in the temperature field;

[0022] The SHELL131 unit is used to simulate the heat conduction of the steel structure, and two layers of SURF152 units are superimposed on the surface to simulate the long-wave radiation between the ground and the air and the convective heat transfer between the airflow;

[0023] Set the solar radiation absorption coefficient, solar constant, atmospheric mass, altitude and shielding effect to calculate the direct and scattered effects of solar radiation;

[0024] Set the surface emissivity and reflection angle coefficient, calculate the long-wave radiation of the ground and atmosphere, and reflect the impact of environmental radiation on the temperature distribution of the steel structure;

[0025] Combined with air temperature, wind speed, altitude and cross-sectional shape of steel components, the convection heat transfer coefficient is calculated and used for thermal analysis.

[0026] In a specific implementation scheme, the thermal analysis finite element model based on the steel structure in the plateau sunshine environment simulates the temperature field distribution law of the steel structure in the plateau area under the sunshine environment, and further includes:

[0027] Based on the finite element method of thermal analysis, combined with the coupling effects of heat conduction, heat radiation and heat convection, a temperature field distribution model of the steel structure is established;

[0028] In the model, the heat transfer processes of heat conduction, heat radiation and convection heat transfer of the steel structure are established separately, and the relevant parameters are set according to the climate environment;

[0029] Mathematical models are used to comprehensively solve the heat transfer processes of heat conduction, heat radiation and heat convection, and the temperature distribution law of steel structures in high-altitude and cold areas under sunlight environment is calculated.

[0030] In a specific possible implementation scheme, the method of simulating the temperature field distribution and time-varying characteristics of the steel structure under the plateau sunshine environment based on the thermal analysis finite element model to determine the construction time of the steel structure under the plateau sunshine temperature environment includes:

[0031] Combined with simulation data, the effects of solar radiation intensity and air convection heat transfer on the temperature of steel structures were analyzed;

[0032] The Pluto index clear sky model is used to calculate the solar temperature field and temperature effect of the steel structure under different initial solar radiation intensities, and the variation range of solar radiation intensity in different months is determined according to the variation law of solar spectrum intensity.

[0033] Analyze the influence of air convection heat transfer coefficient on the sunlight temperature, maximum equivalent stress and maximum deformation of steel structures, and adjust the convection heat transfer coefficient to optimize the model calculation;

[0034] Comprehensively analyze the impact of solar radiation and air convection heat transfer, and determine the appropriate time period for steel structure construction in plateau areas based on the highest annual average temperature in the construction area.

[0035] In the second aspect, the present application provides a steel structure construction optimization system under a plateau sunshine environment, which adopts the following technical solutions:

[0036] A steel structure construction optimization system under plateau sunshine environment, comprising:

[0037] Model building module, used to establish the thermal analysis finite element model of steel structure under plateau sunshine environment;

[0038] Model simulation module, which is used to simulate the temperature field distribution law of steel structures in plateau areas under sunshine environment based on the thermal analysis finite element model of steel structures under plateau sunshine environment;

[0039] The construction optimization module is used to simulate the temperature field distribution and time-varying characteristics of steel structures under plateau sunshine environment based on the thermal analysis finite element model to determine the construction time of steel structures under plateau sunshine temperature environment.

[0040] In a third aspect, the present application provides an electronic device comprising a processor and a memory; the memory stores a program, and the program is loaded and executed by the processor to implement a method for optimizing steel structure construction in a plateau sunshine environment as described in the first aspect.

[0041] In a fourth aspect, the present application provides a computer-readable storage medium, in which a program is stored. When the program is executed by a processor, it is used to implement a method for optimizing steel structure construction in a plateau sunshine environment as described in the first aspect.

[0042] In summary, the beneficial effects of this application include at least:

[0043] 1) By establishing a thermal analysis finite element model under the sunshine environment of the plateau, multiple factors such as solar radiation, air convection heat transfer and thermal radiation are comprehensively considered, and the temperature field distribution law of steel structures in the high-cold areas of the plateau can be accurately simulated. The existing technology fails to fully consider these factors, resulting in inaccurate temperature distribution predictions. This solution fills this gap through a high-precision thermal analysis finite element model, ensuring accurate prediction of the temperature field, especially in the special climate and data-deficient environment of the plateau, which can provide a more scientific and reliable basis for steel structure construction.

[0044] 2) Through accurate calculation of steel structure temperature load and scientific selection of construction time, this application can effectively avoid construction defects caused by uneven temperature or inappropriate construction temperature. For example, excessive temperature difference can cause deformation of steel, stress concentration and other problems, thereby affecting the stability of the structure. Through precise temperature simulation and reasonable construction time optimization, this technical solution can reduce these adverse effects, ensure the quality and stability of the steel structure during construction, and thus improve the efficiency and accuracy of later maintenance. This not only reduces the temperature-related problems that may occur during the construction process, but also improves the long-term safety and durability of the steel structure.

[0045] By establishing a thermal analysis finite element model, simulating the temperature field distribution law of the steel structure under the sunshine environment and determining the appropriate construction time. By establishing a thermal analysis finite element model that comprehensively considers the effects of solar radiation, thermal convection and thermal radiation coupling, the temperature distribution law and time-varying characteristics of the steel structure in the plateau and cold regions are comprehensively analyzed, and the influence of solar radiation intensity and air convection heat exchange on the temperature effect of the steel structure are clarified. Combined with the simulation data, avoid the time period with significant negative temperature effects, select the time period with higher temperature balance as the optimal construction time, and refer to the highest annual average temperature in the construction area to scientifically optimize the construction temperature and time. The present invention solves the problems of inaccurate prediction of the temperature distribution and change law of steel structures in plateau and cold regions and unscientific selection of construction time in the prior art, and effectively improves the construction quality and later maintenance efficiency.

[0046] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a flow chart of the method for optimizing steel structure construction under high altitude sunshine environment in the embodiment of the present application.

[0048] Figure 2 It is a schematic diagram of the process of constructing the finite element model in the embodiment of the present application.

[0049] Figure 3 It is a flow chart of simulating the temperature field distribution law of steel structures in plateau areas under sunlight environment in the embodiment of the present application.

[0050] Figure 4 This is a result diagram of the sunshine temperature field and temperature effect of the steel structure under different initial solar radiation intensities in the embodiment of the present application calculated by the Pluto index clear sky model.

[0051] Figure 5 This is a calculation result diagram of the air convection heat transfer in the embodiment of the present application calculated by the Pluto index clear sky model.

[0052] Figure 6 It is a structural block diagram of the steel structure construction optimization system in the plateau sunshine environment in the embodiment of the present application.

[0053] Figure 7 It is a block diagram of an electronic device for optimizing steel structure construction under a plateau sunshine environment in an embodiment of the present application. DETAILED DESCRIPTION

[0054] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0055] Optionally, the present application uses the steel structure construction optimization method under the plateau sunshine environment provided in each embodiment as an example for use in an electronic device, where the electronic device is a terminal or a server. The terminal may be a mobile phone, a computer, a tablet computer, etc. This embodiment does not limit the type of electronic device.

[0056] Reference Figure 1 , is a flow chart of a method for optimizing steel structure construction under a plateau sunshine environment provided by an embodiment of the present application, the method comprising at least the following steps:

[0057] Step S101: Establish a thermal analysis finite element model of the steel structure under a plateau sunshine environment.

[0058] In step S101, under the coupling of solar short-wave radiation, long-wave radiation from the atmosphere and surrounding environment, and air convection heat transfer, the temperature distribution law and time-varying characteristics of the steel structure are highly accidental, which brings some uncertainty to the design temperature load value of the steel structure building and the calculation of the closing temperature during construction, especially in the high-altitude and cold regions with special climate and lack of research results. Since the field test cannot comprehensively monitor the overall sunshine temperature changes of the steel structure, and even more cannot comprehensively monitor the sunshine temperature response of the structure, it is necessary to establish a finite element model to comprehensively analyze the sunshine temperature field distribution law and time-varying characteristics of the steel structure in the high-altitude and cold regions, and provide a reference for the engineering design verification and high-precision construction of the steel structure building.

[0059] In the implementation, based on the thermal analysis finite element method, according to the engineering drawings of the steel structure, using the powerful data exchange capabilities between the modeling software, meshing software and finite element calculation software, a thermal analysis finite element model of the plate-shell-surface effect unit of the steel structure was established. The modeling method is as follows Figure 2 shown.

[0060] Specifically, first use CAD software to model and extract engineering drawing information. Use CAD software to import plane drawings of steel structures and extract the three-dimensional coordinates of nodes based on the drawings. Classify and annotate rods of different cross-sectional sizes. Generate a complete three-dimensional geometric model through the scanning command based on the three-dimensional coordinates and classification information of the nodes. Determine the origin coordinates of the three-dimensional model and adjust them according to actual needs to ensure that they are consistent with the origin of the finite element model. Export the generated three-dimensional geometric model in IGES file format to provide input data for subsequent finite element meshing.

[0061] Secondly, load the exported IGES file in the HYPERMESH software. Perform geometric cleanup on the imported 3D model, including: splitting faces to reduce model complexity, repairing intersections between faces and lines, splicing faces, and checking geometric integrity to ensure that the model has no openings or overlaps. Then perform meshing. According to the geometric characteristics of different areas and thermal analysis requirements, set the mesh size and division rules. First, divide the meshes of nodes and rods, and then divide the meshes of plates, shells, and surface effect units. Test the initially divided mesh to check whether its shape and size meet the quality standards. Check the mesh quality (such as unit shape, side length ratio, angle, etc.), and perform local optimization to eliminate low-quality units.

[0062] Finally, the optimized mesh data in HYPERMESH is exported as CDB file format for use in finite element calculation software. In the finite element software, the properties of each type of unit are defined according to the thermal analysis requirements, including material parameters such as thermal conductivity, specific heat capacity, and density. The plate and shell units are coupled with the surface effect units to simulate the overall heat transfer characteristics of the steel structure. Thus, the construction of the thermal analysis finite element model is completed.

[0063] Step S102: simulating the temperature field distribution law of the steel structure in the plateau area under the sunshine environment based on the thermal analysis finite element model of the steel structure in the plateau sunshine environment.

[0064] In step S102, based on the thermal analysis finite element method, a plate-shell-surface effect unit thermal analysis finite element model including the coupled effects of heat conduction, thermal radiation and thermal convection is established for the sunlight temperature effect of steel structures in high-altitude and cold areas. In the modeling software, the material of the steel structure is first selected as Q355B. The material properties include thermal conductivity, specific heat capacity, density, elastic modulus, Poisson's ratio and linear expansion coefficient. These parameters jointly determine the thermal conduction behavior of steel in the temperature field. In addition, the characteristics of the surface coating of the steel structure are described by setting the thermal conductivity, radiation absorption and emission characteristics of the surface coating.

[0065] In the meshing software, SHELL131 units are selected to simulate the heat conduction behavior of steel, and the meshing is optimized by setting the unit type to ensure that the model can accurately reflect the changes in temperature gradients. Two layers of SURF152 units are superimposed on the surface of the SHELL131 unit, one layer is used to simulate the long-wave radiation of the ground and air, and the other layer is used to simulate the convective heat exchange with the airflow. The direct and scattered effects of solar radiation are comprehensively calculated by setting the solar radiation absorption coefficient, solar constant, atmospheric mass, altitude, and the shielding effect of the rods. At the same time, the long-wave radiation of the ground and the atmosphere is quantified by the surface emissivity and ground reflection angle coefficient parameters to reflect the influence of environmental radiation on the temperature distribution of the steel structure.

[0066] The calculation of the convective heat transfer coefficient combines factors such as air temperature, wind speed, altitude, and the cross-sectional shape and size of steel components. The altitude plays a key role in the change of air density and convection intensity. By reasonably adjusting the density and unit shape of the mesh division, the accuracy of the model and the balance of calculation efficiency are ensured. All material properties and thermodynamic parameters are uniformly assigned after the mesh division is completed, and exported as CDB format files for subsequent finite element calculation software.

[0067] Among them, steel is very sensitive to temperature changes, and steel structures exposed to the natural environment are very likely to exchange heat with the surrounding environment. Steel structures achieve dynamic thermal balance under the combined action of three heat transfer modes: heat conduction, heat convection, and heat radiation. In heat conduction, based on the heat balance equation of energy conservation, the finite element method can be used to calculate the node temperature and derive other thermal parameters. The matrix equation of nonlinear thermal analysis is:

[0068]

[0069] Where: [K(T)] is the heat transfer matrix, including convection coefficient, thermal conductivity and emissivity; {T} is the node temperature vector; [C(T)] is the specific heat capacity matrix, considering the change of structural internal energy; is the temperature derivative matrix with respect to time; {Q(t)} is the node heat flux vector. The thermal conductivity of steel is about 34 times that of concrete. The thermal conductivity can be used to objectively evaluate the thermal conductivity of different materials. From a microscopic perspective, heat conduction is the phenomenon of heat transfer caused by the thermal motion of microscopic particles such as atoms, molecules, and free electrons inside or between objects. Heat conduction will only occur inside an object or between objects in contact when there is a temperature difference, and the direction of heat conduction follows the second law of thermodynamics.

[0070] Among them, in thermal radiation, assuming that the steel is a uniform isotropic material with no internal heat source, the heat conduction differential equation in the Cartesian coordinate system can be established based on the first law of thermodynamics and Fourier's law of heat conduction:

[0071]

[0072] Where: k is the thermal conductivity of steel, which is 49.8W / (m·℃); ρ is the density of steel, which is 7850kg / m 3 ; c is the specific heat capacity of steel, which is 465J / (kg·℃).

[0073] To calculate the temperature distribution of the steel structure under transient heat conduction, the thermal conduction differential equation is solved under the initial conditions and boundary conditions. The initial condition is the temperature distribution at the initial test time, which can be expressed as:

[0074]

[0075] Where: t is temperature; x, y, z are spatial coordinates; T is time.

[0076] In thermal convection, under the action of solar radiation, the surface temperature of steel components in the natural environment will be higher than the air temperature. While the heat is transferred, the air on the surface of the steel components is heated and rises continuously, air flow occurs, and the sunlight temperature on the surface of the steel components decreases. This is the air convection heat transfer of the steel components. The convection heat transfer can be calculated according to Newton's cooling formula:

[0077] Φ=Ah(t w -t f )=Aq c

[0078] Where: Φ is the convective heat transfer, unit W; A is the surface area of ​​the steel component, unit m 2 ; h is the surface convection heat transfer coefficient, unit W / (m 2 ·℃); t w and t f are the surface temperature of the steel component and the air temperature, in °C; q c is the heat flux density of convective heat transfer, in W / m 2 .

[0079] The convective heat transfer coefficient is the premise for accurately calculating the convective heat transfer, and is affected by the flow cause, flow state, whether the fluid has phase change, geometric factors of the heat transfer surface, and the thermophysical properties of the fluid. In order to obtain the accurate convective heat transfer coefficient of steel structures in high-altitude and cold areas, referring to existing research results, combined with structural morphology and climate environment, the convective heat transfer coefficient of steel structure partitions in high-altitude and cold areas is comprehensively determined to be 23~40W / (m 2 ·℃).

[0080] The process by which an object with a temperature above absolute zero exchanges heat with the surrounding environment in the form of electromagnetic waves is called thermal radiation. The amount of thermal radiation per unit area of ​​an object can be calculated according to the Stefan-Boltzman law:

[0081] q r =εσT 4

[0082] Where: q r is the heat flux density of thermal radiation, in W / m 2 ; σ is the Stefan-Boltzman constant, which is 5.67032×10 -8 W / (m 2 ·K 4 ) ; T is the surface temperature of the object, the unit is K; σ is the surface emissivity of the object, and the emissivity of building steel is 0.75~0.85.

[0083] The thermal radiation of steel structures in the natural environment mainly includes short-wave radiation from the sun, long-wave radiation from the air and the surrounding environment. The steel structure is located in a location with few existing buildings and surrounded by mountains, so only the long-wave thermal radiation of the air and the ground on the structure is considered. The amount of long-wave radiation from the air and the ground received by the surface of the steel structure can be calculated according to the following formula:

[0084]

[0085] Where: q lwr is the long-wave thermal radiation heat flux density of air and ground, in W / m 2 ; σ is the Stefan-Boltzman constant, which is 5.67032×10 -8 W / (m 2 ·K 4 ); fg and ε fa are the radiation emissivity of air and the radiation emissivity of the ground respectively; F wg and F wa are the radiation angle coefficients of the ground and sky respectively; T, T g and T a They are the structure temperature, ground temperature and air temperature.

[0086] The final steel structure thermal analysis finite element model can accurately simulate the temperature field distribution of steel structures in high-altitude cold areas under sunlight. Figure 3 As shown in the figure, the comprehensive analysis of heat conduction, heat radiation and heat convection provides an important basis for the optimal design of steel structures in plateau areas.

[0087] Step S103, simulating the temperature field distribution and time-varying characteristics of the steel structure under the plateau sunshine environment based on the thermal analysis finite element model to determine the construction time of the steel structure under the plateau sunshine temperature environment.

[0088] In step S103, after completing step S101 to establish a thermal analysis finite element model and step S102 to simulate the distribution law of the sunlight temperature field, the influence of factors such as solar radiation intensity and air convection heat transfer on the temperature effect of the steel structure is analyzed in combination with the simulation data to determine the appropriate construction time in the plateau area.

[0089] Specifically, solar radiation is the main heat source that causes the steel structure to heat up. Taking the Shigatse area as an example, its solar spectrum intensity gradually increases from January to July and gradually weakens from August to December. Taking the initial solar radiation intensity of 1750W / m in March as an example, 2 As a benchmark, according to the variation law of solar spectrum intensity in Xigaze area, the variation range between adjacent months is 3.5%. The sunshine temperature field and temperature effect of steel structure under different initial solar radiation intensity are calculated by using the Pluto index clear sky model. The results are as follows: Figure 4 As shown, the maximum values ​​of the sunshine temperature field and temperature effect appear in July when the solar radiation intensity is the highest, and the change pattern is consistent with the change of solar radiation intensity, indicating that the sunshine temperature effect has a significant correlation with the solar radiation intensity. As the initial solar radiation intensity increases, the change pattern of the maximum sunshine temperature of the steel structure is obviously different from the maximum equivalent stress and maximum deformation. The change characteristics of the maximum equivalent stress are obviously different from the maximum deformation. The reason is that there is a large negative temperature effect in the steel structure in the morning, and this negative temperature effect is usually not balanced by the positive temperature effect of sunshine until around 10:00. Therefore, it can be concluded that 0:00-10:00 is not the best construction time for steel structures in plateau areas.

[0090] In addition, air convection heat transfer will make the sunlight temperature of the steel structure approach the air temperature, and will also increase the negative temperature difference between the night temperature and the air temperature, so it is one of the important factors affecting the structural temperature. Figure 5As shown in the figure, with the increase of air convection heat transfer coefficient, the maximum sunshine temperature, maximum equivalent stress and maximum deformation of the steel structure gradually decrease, but the negative temperature effect gradually increases, among which the maximum equivalent stress decreases the most. This shows that strong air convection heat transfer in high-cold areas can weaken the warming effect of sunshine. When the convection heat transfer coefficient decreases, the maximum temperature of the steel structure shows an increasing trend at all times; before 10:00, the maximum equivalent stress of the structure changes less and the smaller the convection heat transfer coefficient, the smaller the maximum equivalent stress; after 10:00, the smaller the convection heat transfer coefficient, the greater the maximum equivalent stress. Comprehensively analyzing the influence of solar radiation and air convection heat transfer, in order to ensure that the initial temperature after the structure is formed can better balance the plateau sunshine temperature effect and the high-cold negative temperature effect, the selection of construction temperature should refer to the highest annual average temperature in the city where the construction area is located. Construction should avoid the period of 0:00-10:00 to reduce the adverse effects of negative temperature. Combined with the balance between the effect of sunlight temperature and air convection heat transfer conditions, the time period with significant sunlight warming effect and high temperature balance is preferred. Finally, by combining the simulation results of step S102 with the construction environment data, step S103 clarifies the basis for selecting the construction time, providing a scientific basis for optimizing the construction time of steel structures in plateau areas.

[0091] In summary, this application establishes a thermal analysis finite element model, simulates the temperature field distribution law of steel structures in a sunshine environment, and determines the appropriate construction time. By establishing a thermal analysis finite element model that comprehensively considers the effects of solar radiation, thermal convection, and thermal radiation coupling, the temperature distribution law and time-varying characteristics of steel structures in plateau and cold regions are comprehensively analyzed, and the influence of solar radiation intensity and air convection heat exchange on the temperature effect of steel structures is clarified. Combined with simulation data, avoid time periods with significant negative temperature effects, select time periods with higher temperature balance as the optimal construction time, and refer to the highest annual average temperature in the construction area to scientifically optimize construction temperature and time. The present invention solves the problems of inaccurate prediction of temperature distribution and change laws of steel structures in plateau and cold regions and unscientific selection of construction time in the prior art, and effectively improves construction quality and later maintenance efficiency.

[0092] Figure 6 This is a structural block diagram of a steel structure construction optimization system under a plateau sunshine environment provided by an embodiment of the present application. The device includes at least the following modules:

[0093] Model building module, used to establish the thermal analysis finite element model of steel structure under plateau sunshine environment;

[0094] Model simulation module, which is used to simulate the temperature field distribution law of steel structures in plateau areas under sunshine environment based on the thermal analysis finite element model of steel structures under plateau sunshine environment;

[0095] The construction optimization module is used to simulate the temperature field distribution and time-varying characteristics of steel structures under plateau sunshine environment based on the thermal analysis finite element model to determine the construction time of steel structures under plateau sunshine temperature environment.

[0096] For relevant details, refer to the above method embodiment.

[0097] Figure 7 4 is a block diagram of an electronic device provided by an embodiment of the present application. The device at least includes a processor 401 and a memory 402.

[0098] The processor 401 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 401 may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor 401 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 401 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 401 may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning.

[0099] The memory 402 may include one or more computer-readable storage media, which may be non-transitory. The memory 402 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 402 is used to store at least one instruction, which is used to be executed by the processor 401 to implement the steel structure construction optimization method under the plateau sunshine environment provided by the method embodiment of the present application.

[0100] In some embodiments, the electronic device may further optionally include: a peripheral device interface and at least one peripheral device. The processor 401, the memory 402 and the peripheral device interface may be connected via a bus or a signal line. Each peripheral device may be connected to the peripheral device interface via a bus, a signal line or a circuit board. Schematically, the peripheral devices include but are not limited to: a radio frequency circuit, a touch display screen, an audio circuit, and a power supply.

[0101] Of course, the electronic device may also include fewer or more components, which is not limited in this embodiment.

[0102] Optionally, the present application also provides a computer-readable storage medium, in which a program is stored, and the program is loaded and executed by a processor to implement the method for optimizing steel structure construction in a plateau sunshine environment of the above-mentioned method embodiment.

[0103] Optionally, the present application also provides a computer product, which includes a computer-readable storage medium, in which a program is stored, and the program is loaded and executed by a processor to implement the method for optimizing steel structure construction in a plateau sunshine environment of the above-mentioned method embodiment.

[0104] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for optimizing steel structure construction under plateau sunshine environment, characterized in that: The method comprises: Establish a thermal analysis finite element model for steel structures under plateau sunshine environment; Based on the thermal analysis finite element model of steel structure under the sunshine environment in the plateau, the temperature field distribution law of steel structure under the sunshine environment in the plateau area is simulated; Based on the thermal analysis finite element model, the temperature field distribution and time-varying characteristics of the steel structure under the plateau sunshine environment are simulated to determine the construction time of the steel structure under the plateau sunshine temperature environment.

2. The method for optimizing steel structure construction under plateau sunshine environment according to claim 1 is characterized in that: The thermal analysis finite element model of the steel structure under the plateau sunshine environment is established as follows: Use CAD software to extract engineering drawing information of steel structures, generate 3D geometric models, determine the 3D coordinates of nodes, and classify and label rods of different cross-sectional sizes; Generate a 3D geometric model through the scanning command and export it to IGES file format as input data for subsequent meshing; Load the exported IGES file in the HYPERMESH software and perform geometry cleanup, including repairing the intersection and coincidence problems between faces and lines, splitting faces, splicing faces, and checking geometric integrity to ensure that the model has no openings or overlaps.

3. The method for optimizing steel structure construction under plateau sunshine environment according to claim 2 is characterized in that: The thermal analysis finite element model of the steel structure under the plateau sunshine environment also includes: In HYPERMESH software, different meshing rules are used to mesh nodes, bars, plate and shell elements, and surface effect elements separately to ensure that the mesh size matches the thermal analysis requirements; Perform quality checks on the initial mesh and optimize low-quality elements to ensure that element shape, side length ratio, and angle meet standards.

4. The method for optimizing steel structure construction under plateau sunshine environment according to claim 2 is characterized in that: The thermal analysis finite element model of the steel structure under the plateau sunshine environment also includes: In the finite element calculation software, import the optimized mesh data output by HYPERMESH, and define the material parameters for each type of unit according to the thermal analysis requirements; The plate and shell elements are coupled with the surface effect elements to simulate the overall heat transfer characteristics of the steel structure and complete the construction of the thermal analysis finite element model.

5. The method for optimizing steel structure construction under plateau sunshine environment according to claim 1, characterized in that: The thermal analysis finite element model of steel structure under plateau sunshine environment simulates the temperature field distribution law of steel structure under plateau sunshine environment, including: Select the material of the steel structure as Q355B, define the material properties, and describe the heat conduction behavior of the steel structure in the temperature field; The SHELL131 unit is used to simulate the heat conduction of the steel structure, and two layers of SURF152 units are superimposed on the surface to simulate the long-wave radiation between the ground and the air and the convective heat transfer between the airflow; Set the solar radiation absorption coefficient, solar constant, atmospheric mass, altitude and shielding effect to calculate the direct and scattered effects of solar radiation; Set the surface emissivity and reflection angle coefficient, calculate the long-wave radiation of the ground and atmosphere, and reflect the impact of environmental radiation on the temperature distribution of the steel structure; Combined with air temperature, wind speed, altitude and cross-sectional shape of steel components, the convection heat transfer coefficient is calculated and used for thermal analysis.

6. The method for optimizing steel structure construction under plateau sunshine environment according to claim 5 is characterized in that: The thermal analysis finite element model based on the steel structure in the plateau sunshine environment simulates the temperature field distribution law of the steel structure in the plateau area under the sunshine environment, and further includes: Based on the finite element method of thermal analysis, combined with the coupling effects of heat conduction, heat radiation and heat convection, a temperature field distribution model of the steel structure is established; In the model, the heat transfer processes of heat conduction, heat radiation and convection heat transfer of the steel structure are established separately, and the relevant parameters are set according to the climate environment; Mathematical models are used to comprehensively solve the heat transfer processes of heat conduction, heat radiation and heat convection, and the temperature distribution law of steel structures in high-altitude and cold areas under sunlight environment is calculated.

7. The method for optimizing steel structure construction under plateau sunshine environment according to claim 1, characterized in that: The method of simulating the temperature field distribution and time-varying characteristics of the steel structure under the plateau sunshine environment based on the thermal analysis finite element model to determine the construction time of the steel structure under the plateau sunshine temperature environment includes: Combined with simulation data, the effects of solar radiation intensity and air convection heat transfer on the temperature of steel structures were analyzed; The Pluto index clear sky model is used to calculate the solar temperature field and temperature effect of the steel structure under different initial solar radiation intensities, and the variation range of solar radiation intensity in different months is determined according to the variation law of solar spectrum intensity. Analyze the influence of air convection heat transfer coefficient on the sunlight temperature, maximum equivalent stress and maximum deformation of steel structures, and adjust the convection heat transfer coefficient to optimize the model calculation; Comprehensively analyze the impact of solar radiation and air convection heat transfer, and determine the appropriate time period for steel structure construction in plateau areas based on the highest annual average temperature in the construction area.

8. A steel structure construction optimization system under plateau sunshine environment, characterized in that: include: Model building module, used to establish the thermal analysis finite element model of steel structure under plateau sunshine environment; Model simulation module, which is used to simulate the temperature field distribution law of steel structures in plateau areas under sunshine environment based on the thermal analysis finite element model of steel structures under plateau sunshine environment; The construction optimization module is used to simulate the temperature field distribution and time-varying characteristics of steel structures under plateau sunshine environment based on the thermal analysis finite element model to determine the construction time of steel structures under plateau sunshine temperature environment.

9. An electronic device, characterized in that: The device includes a processor and a memory; a program is stored in the memory, and the program is loaded and executed by the processor to implement a method for optimizing steel structure construction in a plateau sunshine environment as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The storage medium stores a program, which, when executed by a processor, is used to implement a method for optimizing steel structure construction in a plateau sunshine environment as described in any one of claims 1 to 7.

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