CN113011054A - Finite element software-based mechanical analysis method for LNG (liquefied Natural gas) full-capacity storage tank - Google Patents
Finite element software-based mechanical analysis method for LNG (liquefied Natural gas) full-capacity storage tank Download PDFInfo
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- 238000013461 design Methods 0.000 claims abstract description 25
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention discloses a finite element software-based mechanical analysis method for an LNG (liquefied natural gas) full-capacity storage tank, which comprises the following steps of: s1, determining the types of all structural units of the storage tank, and establishing a component structure; s2, establishing material attributes of various concrete, steel and cold insulation materials according to the design data, and endowing the material attributes with corresponding structures; s3, assembling the structures of all the parts of the storage tank according to design requirements; s4, selecting corresponding analysis steps and output variables according to the analysis types; s5, dividing the three components of the outer tank, the inner tank and the cold insulation material into grids, and subdividing and encrypting the key parts; s6, establishing interaction relations of all parts of the storage tank model and pile-soil interaction relations; s7, applying various load effects and boundary conditions according to requirements; and S8, after calculation is completed, extracting the internal force of the pile foundation, the outer tank and the inner tank. The invention can accurately reflect the mutual relation of the structures, and can simply and effectively reflect the influence of geological conditions on the pile foundation and the whole storage tank, and the analysis effect is good.
Description
Technical Field
The invention relates to the technical field of mechanical analysis methods of LNG (liquefied natural gas) full-capacity storage tanks, in particular to a mechanical analysis method of an LNG full-capacity storage tank based on finite element software.
Background
Liquefied Natural Gas (LNG) is a high-quality clean energy source, and the main component of the LNG is methane. At present, China is greatly improving energy structures, the specific gravity of natural gas consumption is rapidly increased, the import quantity of LNG is increased year by year, a batch of LNG receiving stations are continuously built in coastal areas of China, and dozens of LNG receiving stations are planned or built.
In an LNG receiving station, an LNG storage tank is a monomer with the highest cost and technology content, and at present, a mainstream LNG storage tank is a full-capacity storage tank. The full-containment can body generally comprises: the concrete outer tank consists of a dome, a wall body, a bearing platform and a pile foundation, the 9% nickel steel inner tank and cold insulation materials consist of glass bricks, asphalt felt, perlite and the like.
At present, the LNG storage tank is developed from a 16-ten-thousand-square large storage tank to a 20-thousand-square, 22-thousand-square and 27-thousand-square ultra-large storage tank, and the material cost is higher and higher; the main stress structures of the storage tank are a concrete outer tank and a 9% nickel steel inner tank, and whether reasonable and reliable mechanical analysis can be carried out on the concrete outer tank and the 9% nickel steel inner tank can determine whether the whole storage tank can be safe and reliable and the cost can be controlled simultaneously. For the special structure, it has become a common practice at home and abroad to use finite element software for stress analysis and even to use a plurality of finite element software for comparison and verification.
The ABAQUS software is one of large-scale general finite element software which is widely applied and has the highest recognition degree at home and abroad, is widely applied to multiple fields of civil construction, machinery, materials, acoustics, electromagnetism and the like, and has higher popularity in domestic colleges and universities, scientific research institutions and engineering companies. Therefore, the method is an important and effective way for mastering the mechanical response rule of the LNG storage tank under different loads, obtaining a stress analysis result and determining the size and the material by combining ABAQUS software to develop a finite element model of the LNG storage tank and perform finite element analysis, and has important significance for improving the design reliability and considering the economy.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide a mechanical analysis method of an LNG (liquefied natural gas) full-capacity storage tank based on finite element software, which can truly reflect pile-soil interaction and extract the internal force of a key position so as to provide important reference for determining the material using amount.
In order to solve the technical problem, the invention provides a finite element software-based mechanical analysis method for an LNG (liquefied natural gas) full-capacity storage tank, which comprises the following steps: and S1, determining the types of the structural units of the storage tank and establishing the component structure.
S2, establishing material attributes of various concrete, steel and cold insulation materials according to the design data, and endowing corresponding structures.
And S3, assembling the structures of all the parts of the storage tank according to design requirements.
And S4, selecting corresponding analysis steps and output variables according to the analysis types.
And S5, meshing the three components of the outer tank, the inner tank and the cold insulation material, and subdividing and meshing the key parts.
And S6, establishing interaction relations of all parts of the storage tank model and pile-soil interaction relations.
And S7, applying various load effects and boundary conditions according to requirements.
And S8, after calculation is completed, extracting the internal force of the pile foundation, the outer tank and the inner tank.
Preferably, the step S1 specifically includes: the pile foundation, the outer tank, the cold insulation structure and the inner tank are respectively built according to requirements by simulating the pile foundation with a beam unit, simulating the outer tank and the cold insulation structure with a solid unit and simulating the inner tank with a shell unit.
Preferably, the step S2 includes: the structure of the outer tank, the structure of the cold insulation structure and the structure of the inner tank are respectively split.
Preferably, the step of subdividing the structure of the outer tank, the structure of the cold insulation structure and the structure of the inner tank respectively specifically comprises the steps of: the outer tank is divided into a bearing platform, a tank wall and a dome; carrying out layering treatment on the inner tank, establishing the properties of concrete and cold insulation structure materials according to density, elastic modulus and Poisson ratio data in design requirements, and endowing corresponding structures with the properties; establishing the section attribute of the beam unit, inputting the pile diameter according to the pile foundation parameters and endowing the pile foundation with the pile diameter; and establishing the properties of the cross sections of the shell units according to the inner tank design parameters, and respectively inputting the thicknesses of the inner tank wall plates to endow the inner tank wall plates with corresponding thicknesses.
Preferably, the step S3 specifically includes: arranging pile foundations by adopting an array method according to a pile foundation arrangement diagram; and combining the pile foundation and the outer tank into a component structure according to the design drawing of the storage tank, and moving the cold insulation material and the inner tank to corresponding positions.
Preferably, the step S4 includes: selecting a corresponding analysis step according to the analysis type, and selecting a static analysis step for constant load, live load, wind load, snow load, prestress load, water pressure/air pressure test, air lift load, pressure maintaining pouring load and hydraulic load under operation/leakage working condition; selecting a heat transfer analysis step for the analysis of the temperature field under the operation/leakage condition, and selecting a thermal coupling analysis step for the thermal coupling analysis effect under the operation/leakage condition; and (3) performing vibration type analysis and reaction spectrum analysis step or time course analysis step in the reaction spectrum analysis on the earthquake action.
Preferably, the step S5 includes: finely dividing the outer tank, the inner tank and the cold insulation material to divide a three-dimensional eight-node reduction integral hexahedral mesh, wherein the distribution density interval is 1-2 m; dividing the outer tank, the inner tank and the cold insulation material into 1m wide areas by taking a horizontal coordinate axis as a central line, and increasing the seed distribution density, wherein the seed distribution density is 0.125 m; the three-dimensional eight-node reduction integral entity unit is adopted for the entity unit, the two-node line unit beam unit is adopted for the beam unit, and the four-node reduction integral shell unit is adopted for the shell unit.
Preferably, the step S6 includes: binding the outer tank and the cold insulation material, and binding the cold insulation material and the inner tank through iron; dividing soil layers under the storage tank according to a geological survey report, determining the elevation and the thickness of each soil layer, calculating the calculation width b of a pile foundation, determining the proportional coefficient m of the horizontal resistance coefficient according to the soil texture condition, and calculating a spring constant k according to the condition that k is zxbxmxmxhwhere z and h are the depth of the position where the spring is located and the thickness of the soil layer respectively; the pile foundation is divided according to soil layers, and two springs with the same spring constant in the horizontal direction are applied to the middle point of each layer of soil.
Preferably, the step S7 includes: applying a fixing and supporting constraint to the pile end; and applying various loads to the model according to needs, wherein constant loads, live loads, wind loads, snow loads, pre-stress loads, water pressure/air pressure tests, air lift top loads, pressure maintaining pouring loads, operation/leakage working condition hydraulic loads and explosive loads can be applied through pressure, operation/leakage working condition temperature field analysis and thermal coupling analysis can be applied through generating heat flux in a load option or creating temperature in a boundary condition option, and seismic action can be applied through inputting a seismic response spectrum or a seismic acceleration time course curve.
Preferably, the step S8 includes: after submitting calculation and finishing, extracting internal force of each key part, and directly extracting axial force, shearing force and bending moment of the beam unit for the internal force of the pile foundation; equivalent stress can be directly extracted from the inner tank; for the solid unit structures of the bearing platform and the dome, extracting radial axial force/bending moment and annular axial force/bending moment in an encrypted area with the width of 1m by adopting a method for extracting axial force and bending moment of the cross section of the pile; and extracting the vertical axial force/bending moment and the circumferential axial force/bending moment in an encrypted area with the width of 1m by adopting a method for extracting the axial force and the bending moment of the cross section of the pile from the tank wall.
The invention has the technical effects that: s1, determining the types of all structural units of the storage tank, and establishing a component structure; s2, establishing material attributes of various concrete, steel and cold insulation materials according to the design data, and endowing the material attributes with corresponding structures; s3, assembling the structures of all the parts of the storage tank according to design requirements; s4, selecting corresponding analysis steps and output variables according to the analysis types; s5, dividing the three components of the outer tank, the inner tank and the cold insulation material into grids, and subdividing and encrypting the key parts; s6, establishing interaction relations of all parts of the storage tank model and pile-soil interaction relations; s7, applying various load effects and boundary conditions according to requirements; and S8, after calculation is completed, extracting the internal force of the pile foundation, the outer tank and the inner tank. All important stressed structures of the full-capacity storage tank can accurately reflect the mutual relation among the structures, and the influence of geological conditions on the pile foundation and the whole storage tank can be simply and effectively reflected; the extraction of the internal force of the entity unit at the key position of the model can be realized, and a more accurate result can be obtained under the conditions of not increasing the number of units and controlling the calculation cost.
Drawings
Fig. 1 is a flowchart of a mechanical analysis method of an LNG full-capacity storage tank based on finite element software according to an embodiment of the present invention.
Fig. 2 is an overall modeling diagram of an LNG storage tank in the finite element software provided in the embodiment of the present invention.
Fig. 3 is an exploded view of a model of an LNG storage tank in finite element software according to an embodiment of the present invention.
Fig. 4 is an overall modeling diagram of an LNG storage tank in the finite element software provided in the embodiment of the present invention.
Fig. 5 is an exploded view of a model of an LNG storage tank in finite element software according to an embodiment of the present invention.
Fig. 6 is an overall view of a model of an LNG storage tank in finite element software according to an embodiment of the present invention.
Fig. 7 is a grid section and an encrypted region of an LNG tank model in finite element software according to an embodiment of the present invention.
Fig. 8 is a pile-soil spring diagram of a model LNG storage tank according to an embodiment of the present invention.
Description of reference numerals: 1-dome, 2-tank wall, 3-bearing platform, 4-pile foundation, 5-bottom and side wall cold insulation material, 6-inner tank wall plate and bottom plate, 7-grid encryption area, and 8-pile soil spring.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
As shown in fig. 1, an embodiment of the present invention provides a method for mechanical analysis of an LNG full-capacity storage tank based on finite element software, where the method includes the steps of: and S1, determining the types of the structural units of the storage tank and establishing the component structure.
Specifically, each structural unit type of the storage tank is determined through finite element software, and the component structure is established through the acquired structural unit types.
S2, establishing material attributes of various concrete, steel and cold insulation materials according to the design data, and endowing corresponding structures.
Specifically, the material properties of various types of concrete, steel and cold insulation materials are established according to the designed data, and corresponding structures are given according to the established material properties of various types of concrete, steel and cold insulation materials. Wherein, the concrete structure, steel structure, cold insulation material structure and the like with corresponding structures.
And S3, assembling the structures of all the parts of the storage tank according to design requirements.
Specifically, according to the corresponding structures given by the obtained concrete, steel and cold insulation materials, the structures of all the parts of the storage tank are assembled according to design requirements, so that the storage tank is convenient to assemble.
And S4, selecting corresponding analysis steps and output variables according to the analysis types.
And S5, meshing the three components of the outer tank, the inner tank and the cold insulation material, and subdividing and meshing the key parts.
Specifically, the grids are divided through the three components of the outer tank, the inner tank and the cold insulation material, the key parts are divided and encrypted, the grids are clearly divided through the grids of the outer tank, the inner tank and the cold insulation material, meanwhile, the grids can be encrypted through the main parts, and the safety of the outer tank, the inner tank and the cold insulation material is high.
And S6, establishing interaction relations of all parts of the storage tank model and pile-soil interaction relations. The interaction relationship between the storage tank model and the pile soil is completely established, and the storage tank model and the pile soil are conveniently known.
And S7, applying various load effects and boundary conditions according to requirements.
And S8, after calculation is completed, extracting the internal force of the pile foundation 4, the outer tank and the inner tank.
The finite element software is ABAQUS finite element software.
In the specific embodiment, the types of all structural units of the storage tank are determined, and a component structure is established; establishing material attributes of various concrete, steel and cold insulation materials according to design data, and endowing the material attributes with corresponding structures; assembling the structures of all parts of the storage tank according to design requirements; selecting corresponding analysis steps and output variables according to the analysis types; dividing the three components of the outer tank, the inner tank and the cold insulation material into grids, and subdividing and meshing key parts; establishing interaction relations of all parts of the storage tank model and pile-soil interaction relations; applying various load effects and boundary conditions according to requirements; and after the calculation is finished, extracting the internal force of the pile foundation 4, the outer tank and the inner tank. All important stressed structures of the full-capacity storage tank can accurately reflect the mutual relation among the structures, and the influence of geological conditions on the pile foundation 4 and the whole storage tank can be simply and effectively reflected; the extraction of the internal force of the entity unit at the key position of the model can be realized, and a more accurate result can be obtained under the conditions of not increasing the number of units and controlling the calculation cost.
In an alternative embodiment of the present invention, as shown in fig. 2 to 8, the step S1 specifically includes: in a Part module (common module), a pile foundation 4 is simulated through a beam unit, an outer tank and a cold insulation structure are simulated through a solid unit, an inner tank is simulated through a shell unit, and the pile foundation 4, the outer tank, the cold insulation structure and the inner tank are respectively established according to design drawing requirements. Wherein, the outer tank comprises a bearing platform 3, a tank wall 2, a dome 1 and the like.
In an alternative embodiment of the present invention, as shown in fig. 2 to 8, the step S2 includes: the structure of the outer tank, the structure of the cold insulation structure and the structure of the inner tank are respectively split. Through carrying out effectual subdivision respectively to outer jar, cold insulation structure and the inner tank of difference to make outer jar, inner tank and cold insulation structure subdivision clear, be convenient for people to know the structure of each outer jar, inner tank and cold insulation structure.
In an alternative embodiment of the present invention, as shown in fig. 2 to 8, the step of dividing the structures of the outer tank, the cold insulation structure and the inner tank respectively specifically includes: the outer tank is divided into a bearing platform 3, a tank wall 2 and a dome 1; carrying out layering treatment on the inner tank, establishing the properties of concrete and cold insulation structure materials according to density, elastic modulus and Poisson ratio data in design requirements, and endowing corresponding structures with the properties; building the section attribute of the beam unit, inputting the pile diameter according to the parameters of the pile foundation 4 and endowing the pile foundation 4 with the pile foundation; and establishing the section attributes of the plurality of shell units according to the design parameters of the inner tank, respectively inputting the thicknesses of the 2 plates of the inner tank wall, and endowing the corresponding 2 plates of the inner tank wall. The structures of the outer tank, the inner tank and the cold insulation structure are clearly split, and analysis is facilitated.
In an alternative embodiment of the present invention, as shown in fig. 2 to 8, the step S3 specifically includes: in an Assembly module, arranging the pile foundation 4 by an array method according to a pile foundation 4 arrangement diagram; the pile foundation 4 and the outer tank are combined into a component structure according to the design drawing of the storage tank, and the cold insulation material and the inner tank are moved to corresponding positions.
Specifically, the pile foundations 4 are arranged by an array method according to a pile foundation 4 arrangement diagram; the pile foundations 4 are combined with the outer vessel into one component structure according to the tank design drawing, and the bottom and side wall cold insulation 5 and the inner vessel wall plates and bottom plate 6 are moved to the corresponding positions.
In an alternative embodiment of the present invention, the step S4 includes: in the Step module, selecting corresponding analysis steps according to the analysis types, and selecting Static General (Static) analysis steps for Static loads such as constant loads, live loads, wind loads, snow loads, prestress loads, hydraulic pressure/air pressure tests, air-lift top loads, pressure-maintaining pouring loads, operation/leakage working condition hydraulic loads and the like. A Heat transfer analysis step is selected for analyzing the temperature field of the operation/leakage condition, and a Coupled temp-displacement analysis step is selected for analyzing the thermodynamic coupling of the operation/leakage condition. For the seismic action, the analysis step of Response Spectrum is carried out by Frequency (vibration mode analysis) and Response Spectrum (Response Spectrum) or by Dynamic, impricit (time course analysis). Therefore, different analysis steps are selected according to different analysis types, so that all important stressed structures of the full-capacity storage tank can accurately reflect the mutual relation among the structures, and the influence of geological conditions on the pile foundation 4 and the whole storage tank can be simply and effectively reflected; the extraction of the internal force of the entity unit at the key position of the model can be realized, so that the analysis effect is better.
In an alternative embodiment of the present invention, as shown in fig. 2 to 8, the step S5 includes: in the Mesh module, finely dividing an outer tank (comprising a pile foundation 4), an inner tank and cold insulation materials to divide a three-dimensional eight-node reduction integral (3D8R) hexahedral Mesh, wherein the seed distribution density is preferably 1m-2 m; dividing the outer tank, the inner tank and the cold insulation material into 1m wide areas by taking a horizontal coordinate axis as a central line, and increasing the seed distribution density, wherein the seed distribution density is 0.125 m; the three-dimensional eight-node reduction integral (C3D8R) solid unit is adopted for the solid unit, the spatial two-node line unit (B31) beam unit is adopted for the beam unit, and the four-node reduction integral (S4R) shell unit is adopted for the shell unit.
In an alternative embodiment of the present invention, as shown in fig. 2 to 8, the step S6 includes: binding an outer tank and a cold insulation material, and binding the cold insulation material and an inner tank through iron in an Interaction module; dividing soil layers under the storage tank according to a geological survey report, determining the elevation and the thickness of each soil layer, calculating the calculation width b of the pile foundation 4, determining the proportional coefficient m of the horizontal resistance coefficient according to the soil texture condition and the technical specification of the building pile foundation 4, and calculating the constant k of the spring 8 according to the condition that k is the depth of the position of the spring 8 and the thickness of the soil layer; the pile foundation 4 is divided according to the soil layers, and two springs 8 with the same spring 8 constant in the horizontal direction are applied to the middle point of each layer of soil.
In an alternative embodiment of the present invention, as shown in fig. 2 to 8, the step S7 includes: in the Load module, fixing and supporting constraints are applied to the pile end; various loads are applied to the model according to needs, wherein constant loads, live loads, wind loads, snow loads, prestress loads, water Pressure/air Pressure tests, air lift top loads, Pressure maintaining pouring loads, operation/leakage working Condition hydraulic loads and explosion loads can be applied through Pressure (Pressure), operation/leakage working Condition temperature field analysis and thermal coupling analysis can be applied through heat flux (heat flux) in a load (Creat load) option or temperature in a Boundary Condition (Creat Boundry Condition) creation option, and seismic action can be applied through input of a seismic response spectrum or a seismic acceleration time-course curve.
In an alternative embodiment of the present invention, as shown in fig. 2 to 8, the step S8 includes: after submitting calculation and finishing, extracting internal force of each key part, and directly extracting axial force, shearing force and bending moment of the beam unit for the internal force of the pile foundation 4; equivalent stress can be directly extracted from the inner tank; for the solid unit structures of the bearing platform 3 and the dome 1, extracting the radial axial force/bending moment and the circumferential axial force/bending moment of the 1m wide encryption area 7 by adopting a method for extracting the axial force and the bending moment of the pile section; and extracting the vertical axial force/bending moment and the circumferential axial force/bending moment of the 1m wide encryption area 7 from the tank wall 2 by adopting a method for extracting the axial force and the bending moment of the pile section. The internal force value can be used for reinforcement calculation, crack checking and the like.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A mechanical analysis method of an LNG full-capacity storage tank based on finite element software is characterized by comprising the following steps: the method comprises the following steps:
s1, determining the types of all structural units of the storage tank, and establishing a component structure;
s2, establishing material attributes of various concrete, steel and cold insulation materials according to the design data, and endowing the material attributes with corresponding structures;
s3, assembling the structures of all the parts of the storage tank according to design requirements;
s4, selecting corresponding analysis steps and output variables according to the analysis types;
s5, dividing the three components of the outer tank, the inner tank and the cold insulation material into grids, and subdividing and encrypting the key parts;
s6, establishing interaction relations of all parts of the storage tank model and pile-soil interaction relations;
s7, applying various load effects and boundary conditions according to requirements;
and S8, after calculation is completed, extracting the internal force of the pile foundation, the outer tank and the inner tank.
2. The finite element software-based mechanical analysis method for an LNG storage tank according to claim 1, wherein the step S1 specifically comprises:
the pile foundation, the outer tank, the cold insulation structure and the inner tank are respectively built according to requirements by simulating the pile foundation with a beam unit, simulating the outer tank and the cold insulation structure with a solid unit and simulating the inner tank with a shell unit.
3. The finite element software-based mechanical analysis method for an LNG full-capacity storage tank as claimed in claim 2, wherein the step S2 comprises:
the structure of the outer tank, the structure of the cold insulation structure and the structure of the inner tank are respectively split.
4. The finite element software-based mechanical analysis method for the LNG full-capacity storage tank as claimed in claim 3, wherein the step of respectively dividing the structure of the outer tank, the structure of the cold insulation structure and the structure of the inner tank comprises the following steps:
the outer tank is divided into a bearing platform, a tank wall and a dome;
carrying out layering treatment on the inner tank, establishing the properties of concrete and cold insulation structure materials according to density, elastic modulus and Poisson ratio data in design requirements, and endowing corresponding structures with the properties;
establishing the section attribute of the beam unit, inputting the pile diameter according to the pile foundation parameters and endowing the pile foundation with the pile diameter;
and establishing the properties of the cross sections of the shell units according to the inner tank design parameters, and respectively inputting the thicknesses of the inner tank wall plates to endow the inner tank wall plates with corresponding thicknesses.
5. The finite element software-based mechanical analysis method for an LNG storage tank according to claim 1, wherein the step S3 specifically comprises:
arranging pile foundations by adopting an array method according to a pile foundation arrangement diagram;
and combining the pile foundation and the outer tank into a component structure according to the design drawing of the storage tank, and moving the cold insulation material and the inner tank to corresponding positions.
6. The finite element software-based mechanical analysis method for an LNG full-capacity storage tank as claimed in claim 1, wherein the step S4 includes:
selecting a corresponding analysis step according to the analysis type, and selecting a static analysis step for constant load, live load, wind load, snow load, prestress load, water pressure/air pressure test, air lift load, pressure maintaining pouring load and hydraulic load under operation/leakage working condition;
selecting a heat transfer analysis step for the analysis of the temperature field under the operation/leakage condition, and selecting a thermal coupling analysis step for the thermal coupling analysis effect under the operation/leakage condition;
and (3) performing vibration type analysis and reaction spectrum analysis step or time course analysis step in the reaction spectrum analysis on the earthquake action.
7. The finite element software-based mechanical analysis method for an LNG full-capacity storage tank as claimed in claim 1, wherein the step S5 includes:
finely dividing the outer tank, the inner tank and the cold insulation material to divide a three-dimensional eight-node reduction integral hexahedral mesh, wherein the distribution density interval is 1-2 m;
dividing the outer tank, the inner tank and the cold insulation material into 1m wide areas by taking a horizontal coordinate axis as a central line, and increasing the seed distribution density, wherein the seed distribution density is 0.125 m;
the three-dimensional eight-node reduction integral entity unit is adopted for the entity unit, the two-node line unit beam unit is adopted for the beam unit, and the four-node reduction integral shell unit is adopted for the shell unit.
8. The finite element software-based mechanical analysis method for an LNG full-capacity storage tank as claimed in claim 1, wherein the step S6 includes:
binding the outer tank and the cold insulation material, and binding the cold insulation material and the inner tank through iron;
dividing soil layers under the storage tank according to a geological survey report, determining the elevation and the thickness of each soil layer, calculating the calculation width b of a pile foundation, determining the proportional coefficient m of the horizontal resistance coefficient according to the soil texture condition, and calculating a spring constant k according to the condition that k is zxbxmxmxhwhere z and h are the depth of the position where the spring is located and the thickness of the soil layer respectively;
the pile foundation is divided according to soil layers, and two springs with the same spring constant in the horizontal direction are applied to the middle point of each layer of soil.
9. The finite element software-based mechanical analysis method for an LNG full-capacity storage tank as claimed in claim 1, wherein the step S7 includes:
applying a fixing and supporting constraint to the pile end;
and applying various loads to the model according to needs, wherein constant loads, live loads, wind loads, snow loads, pre-stress loads, water pressure/air pressure tests, air lift top loads, pressure maintaining pouring loads, operation/leakage working condition hydraulic loads and explosive loads can be applied through pressure, operation/leakage working condition temperature field analysis and thermal coupling analysis can be applied through generating heat flux in a load option or creating temperature in a boundary condition option, and seismic action can be applied through inputting a seismic response spectrum or a seismic acceleration time course curve.
10. The finite element software-based mechanical analysis method for an LNG full-capacity storage tank as claimed in claim 1, wherein the step S8 includes:
after submitting calculation and finishing, extracting internal force of each key part, and directly extracting axial force, shearing force and bending moment of the beam unit for the internal force of the pile foundation;
equivalent stress can be directly extracted from the inner tank;
for the solid unit structures of the bearing platform and the dome, extracting radial axial force/bending moment and annular axial force/bending moment in an encrypted area with the width of 1m by adopting a method for extracting axial force and bending moment of the cross section of the pile;
and extracting the vertical axial force/bending moment and the circumferential axial force/bending moment in an encrypted area with the width of 1m by adopting a method for extracting the axial force and the bending moment of the cross section of the pile from the tank wall.
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