CN107609315B - Finite element modeling method for integral structure of prefabricated concrete shear wall - Google Patents
Finite element modeling method for integral structure of prefabricated concrete shear wall Download PDFInfo
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Abstract
The invention discloses a finite element modeling method for an integral structure of a prefabricated concrete shear wall, which mainly comprises the following steps: firstly, establishing a horizontal and vertical connection refined finite element model of a prefabricated wall component, and extracting the mechanical property of a contact surface; secondly, extracting characteristic wall components and establishing a finite element model library of the characteristic wall components; and thirdly, assembling a finite element model of the integral structure of the prefabricated shear wall. The invention simplifies the whole structure model, reduces the number of units, optimizes the analysis path and improves the calculation efficiency. The method establishes the finite element overall structure model which can embody the connection structure characteristics and the stress characteristics of the prefabricated concrete shear wall structure, and solves the problems that the finite element model established by the existing method cannot truly and comprehensively reflect the connection structure characteristics between prefabricated walls, the analysis efficiency is low, the finite element model has poor goodness of fit with an actual structure and the like.
Description
Technical Field
The invention relates to a finite element modeling method for an integral structure of a prefabricated concrete shear wall.
Background
The prefabricated concrete structure is prefabricated in a factory through main components, and is assembled on a construction site, which is a main structural form of modern building industrialization. The structure has the advantages of short construction period, low labor intensity, high construction quality, environmental protection and the like, meets national policies and development requirements of national housing industrialization and building energy conservation and emission reduction, and the shear wall structure is a common structural form in high-rise buildings. In recent years, China pays more attention to the research and application of prefabricated concrete structures. Therefore, the research and application of the integral structure of the prefabricated concrete shear wall become a hot problem in structural engineering.
Students at home and abroad develop multi-azimuth research on wall limbs, connecting beams, double-limb shear walls and the like of the prefabricated concrete shear wall structure, the research on various prefabricated wall bodies mainly takes experimental research as a main part, research objects limited by loading equipment, test fields and the like are mostly reduced-scale components, and the experimental research on the full-size prefabricated reinforced concrete shear wall structure is difficult. In order to deeply research the stress performance of the structure, perform multi-parameter analysis and solve the problems of high test research cost, limited test conditions and the like, the finite element method is the best method recognized at present for analysis.
At present, nonlinear finite element analysis research is carried out on cast-in-place reinforced concrete shear wall components and integral structures, but nonlinear finite element analysis aiming at the integral structures of prefabricated reinforced concrete shear walls is not common, mainly because the structure is complex in modeling, the mechanical property of a contact surface is not clear and the calculation efficiency is low. Therefore, the method for modeling the finite element model of the integral structure of the prefabricated concrete shear wall is very important.
Disclosure of Invention
The invention aims to provide a finite element modeling method for an integral structure of a prefabricated concrete shear wall, which can establish a stress characteristic model of the integral structure of the prefabricated concrete shear wall, provides a modeling method which is simple in operation and high in precision, and realizes finite element analysis on the integral structure of the prefabricated concrete shear wall.
In order to solve the problems in the prior art, the invention adopts the technical scheme that:
the finite element modeling method for the integral structure of the prefabricated concrete shear wall mainly comprises the following steps:
firstly, establishing a horizontal and vertical connection refined finite element model of a prefabricated wall component, and extracting the mechanical property of a contact surface;
secondly, extracting characteristic wall components and establishing a finite element model library of the characteristic wall components;
and thirdly, assembling a finite element model of the integral structure of the prefabricated shear wall.
The first step comprises the following steps:
according to a three-dimensional CAD model of the overall structure of the prefabricated assembly type concrete shear wall, refined finite element modeling is carried out on horizontal and vertical connecting components of all standardized walls in the overall structure of the integrally formed assembly type shear wall, a three-dimensional solid unit C3D8R is adopted to simulate concrete, a three-dimensional truss unit T3D2 simulates reinforcing steel bars, the reinforcing steel bar units are embedded into the concrete to enable the reinforcing steel bar units to work cooperatively, the stress performance of joints of the prefabricated walls is simulated by arranging contact units, and the stress performance of the horizontal and vertical connecting joints of all standardized walls is obtained through analysis.
The second step comprises the following steps:
actively simplifying a wall in the integral structure into a quadrilateral characteristic component, establishing a finite element simplified model of the characteristic wall component by adopting an S4R shell unit, reinforcing the wall unit by using a REBAR LAYER command, and interactively inputting geometric parameters and unit material parameters; the geometric parameters of the characteristic wall model refer to the section size and the key point coordinates of the simplified model wall, and the unit material parameters refer to the damage constitutive relation of concrete and reinforcing steel bar rate which is given to the wall concrete unit and the reinforcing steel bar unit;
the third step comprises the following steps:
assembling the built characteristic wall body components through the connecting units, endowing the stress performance of the joint obtained in the first step to each connecting unit, forming a prefabricated shear wall integral structure finite element model matched with the integral structure three-dimensional CAD model, converting the model into an INP file, storing the INP file into an ABAQUS corresponding working directory, and calling the file under an ABAQUS CAE operating interface to directly generate the prefabricated shear wall integral structure finite element model.
The invention has the advantages and effects that:
the finite element modeling method for the integral structure of the prefabricated concrete shear wall comprises the following steps: establishing a component refined finite element model by using an entity unit entity, and solving the stress performance of vertical and horizontal contact surfaces of the prefabricated wall component and the cast-in-place component through an explicit or implicit algorithm; simulating main stressed members such as walls, coupling beams and the like in the whole structure by adopting the layered shell units, respectively endowing concrete and reinforcement rate related damage constitutive models to the concrete units and the reinforcement units in the prefabricated walls, and analyzing to obtain the mechanical and deformation properties of the contact surfaces between the prefabricated walls; adopting the connecting units to simulate the horizontal and vertical contact surfaces of the prefabricated wall member and the cast-in-place wall member, and endowing the contact surface attributes obtained by analysis to the corresponding connecting units; the method is realized by using finite element software ABAQUS. The method adopts the connecting units to simulate the prefabricated components and the seams between the prefabricated components and the cast-in-place components, so that the mechanical and deformation properties of the seam surfaces of the prefabricated wall can be effectively reflected, an overall structure model is simplified, the number of units is reduced, an analysis path is optimized, and the calculation efficiency is improved. The method establishes the finite element overall structure model which can embody the connection structure characteristics and the stress characteristics of the prefabricated concrete shear wall structure, and solves the problems that the finite element model established by the existing method cannot truly and comprehensively reflect the connection structure characteristics between prefabricated walls, the analysis efficiency is low, the finite element model has poor goodness of fit with an actual structure and the like.
Drawings
The invention is described in further detail below with reference to the accompanying drawings:
FIG. 1 is a flow chart of a finite element modeling method for an integral structure of a prefabricated concrete shear wall according to the invention;
FIG. 2 is a schematic diagram of a refined finite element model of an integral structure solid unit of the prefabricated concrete shear wall according to the invention;
FIG. 3 is a schematic diagram of a refined finite element model of a solid element for obtaining the shear resistance of a vertical seam according to the present invention;
FIG. 4 is a schematic diagram of a refined finite element model of a solid element for obtaining the horizontal stress performance of a vertical joint according to the present invention;
FIG. 5 is a schematic diagram of a refined finite element model of a solid element for obtaining the shearing resistance of a horizontal seam according to the present invention;
FIG. 6 is a schematic diagram of a refined finite element model of a solid element for obtaining vertical stress performance of a horizontal seam according to the present invention;
fig. 7 is a simplified assembly diagram of prefabricated wall elements according to the present invention.
Wherein: the prefabricated wall body 1 is a prefabricated wall body, the cast-in-place wall body at the vertical joint 2 is a connecting unit of the vertical joint 3, and the connecting unit of the horizontal joint 4.
Detailed Description
The present invention is further described in detail with reference to the following specific examples, but the scope of the present invention is not limited by the specific examples, which are defined by the claims. In addition, any modification or change that can be easily made by a person having ordinary skill in the art without departing from the technical solution of the present invention will fall within the scope of the claims of the present invention.
As shown in fig. 1 and 2, a finite element modeling method for an integral structure of a prefabricated concrete shear wall comprises the following steps:
firstly, establishing a horizontal and vertical connection refined finite element model of the prefabricated wall body 1 member, and extracting the mechanical property of the contact surface, as shown in fig. 3, 4, 5 and 6. According to a three-dimensional CAD model of the integral structure of the prefabricated assembly type concrete shear wall, refined finite element modeling is carried out on horizontal and vertical connecting members of all standardized walls in the integral structure of the integrally formed assembly type shear wall, a three-dimensional solid unit C3D8R is adopted to simulate concrete, a three-dimensional truss unit T3D2 simulates reinforcing steel bars, the reinforcing steel bar units are embedded into the concrete to enable the reinforcing steel bar units to work cooperatively, the stress performance of joints of the prefabricated walls is simulated by arranging contact units, and the stress performance and the damage process of a test piece are analyzed by adopting a monotone loading mode through an explicit or implicit calculation method, so that the stress performance of the joints of the horizontal and vertical connecting members of all standardized walls is obtained.
And secondly, extracting the characteristic wall body component and establishing a finite element model library of the characteristic wall body component. Actively simplifying a wall in the integral structure into a quadrilateral characteristic component, establishing a finite element simplified model of the characteristic wall component by adopting an S4R shell unit, reinforcing the wall unit by using a REBAR LAYER command, and interactively inputting geometric parameters and unit material parameters; the geometric parameters of the characteristic wall model refer to the section size and the key point coordinates of the simplified model wall, and the unit material parameters refer to the damage constitutive relation of concrete and reinforcing steel bar rate which is given to the wall concrete unit and the reinforcing steel bar unit.
And thirdly, assembling a finite element model of the integral structure of the prefabricated shear wall, as shown in fig. 7. The built characteristic wall body components are assembled through the connecting units 3 of the vertical seams and the connecting units 4 of the horizontal seams, the stress performance of the seams obtained in the first step is endowed to each connecting unit, a prefabricated assembly type shear wall integral structure finite element model matched with the integral structure three-dimensional CAD model is formed, the model is converted into an INP file and stored into an ABAQUS corresponding working catalog, and the prefabricated assembly type shear wall integral structure finite element model can be directly generated by calling the file under the ABAQUS CAE running interface.
This is further illustrated below with reference to an embodiment:
in a prefabricated reinforced concrete shear wall structure, a whole full-size prefabricated concrete shear wall structure with vertical joints and horizontal joints is selected as a research object, as shown in fig. 7.
According to the three-dimensional CAD model of the prefabricated assembly type concrete shear wall overall structure, entity unit refined finite element models are respectively established for connecting components of the horizontal and vertical stress performance of the vertical seams of the standardized wall body in the overall assembly type shear wall overall structure, as shown in figures 3 and 4. The method comprises the steps of simulating concrete by using a three-dimensional solid unit C3D8R, simulating reinforcing steel bars by using a three-dimensional truss unit T3D2, embedding the reinforcing steel bar units into the concrete to enable the reinforcing steel bar units to work cooperatively, simulating the stress performance of the joints of the prefabricated wall body by using a contact unit, analyzing the stress performance and the damage process of a test piece by using an explicit or implicit calculation method and a monotone loading mode, and obtaining the stress performance of the joints of the horizontal and vertical connecting pieces of each standardized wall body.
The prefabricated wall components and the cast-in-place wall 2 components at the vertical seams in the integral structure are actively simplified into quadrilateral characteristic components, as shown in fig. 7. Establishing a finite element simplified model of the characteristic wall member by adopting an S4R shell unit, carrying out reinforcement on the wall unit through a REBAR LAYER command, and simultaneously interactively inputting geometric parameters and unit material parameters; the geometric parameters of the characteristic wall model refer to the section size and the key point coordinates of the simplified model wall, and the unit material parameters refer to the damage constitutive relation of concrete and reinforcing steel bar rate which is given to the wall concrete unit and the reinforcing steel bar unit.
And assembling the prefabricated shear wall integral structure finite element model as shown in figure 7. Assembling the established characteristic wall components through a connecting unit Slide-Plane, associating Elasticity with the Plasticity when a connecting unit parameter model is set, endowing the stress performance of the joint obtained in the first step to each connecting unit to form a prefabricated shear wall integral structure finite element model matched with the integral structure three-dimensional CAD model, converting the model into an INP file, storing the INP file into an ABAQUS corresponding working catalog, and calling the file under an ABAQUS CAE running interface to directly generate the prefabricated shear wall integral structure finite element model.
And applying boundary displacement and seismic waves to the simplified finite element model of the prefabricated shear wall structure, performing finite element calculation analysis, extracting relevant data, and further analyzing. Through analysis, the method solves the problems that the finite element model established by the existing method cannot truly and comprehensively reflect the characteristics of the connection structure between prefabricated walls, the analysis efficiency is low, the goodness of fit between the finite element model and the actual structure is poor, and the like.
The invention is not to be considered as limited to the specific embodiments thereof, and all changes and equivalents that can be made by a person skilled in the art without departing from the spirit and principle of the inventive concept are intended to be embraced therein.
Claims (1)
1. The finite element modeling method for the integral structure of the prefabricated assembled concrete shear wall is characterized by mainly comprising the following steps of:
firstly, establishing a horizontal and vertical connection refined finite element model of a prefabricated wall component, and extracting the mechanical property of a contact surface;
secondly, extracting characteristic wall components and establishing a finite element model library of the characteristic wall components;
thirdly, assembling a finite element model of the integral structure of the prefabricated shear wall;
the first step comprises the following steps:
according to the three-dimensional CAD model of the integral structure of the prefabricated assembly type concrete shear wall, carrying out refined finite element modeling on horizontal and vertical connecting components of each standardized wall body in the integral structure of the integrally-assembled assembly type shear wall;
the stress performance of the joints of the prefabricated wall is simulated by arranging the contact units, and the stress performance of the joints of the horizontal and vertical connecting pieces of each standardized wall is obtained through analysis;
simulating concrete by adopting a three-dimensional solid unit C3D8R, simulating a steel bar by using a three-dimensional truss unit T3D2, and embedding the steel bar unit into the concrete to enable the steel bar unit to work cooperatively;
the second step comprises the following steps:
actively simplifying a wall in the integral structure into a quadrilateral characteristic component, establishing a finite element simplified model of the characteristic wall component by adopting an S4R shell unit, reinforcing the wall unit by using a REBAR LAYER command, and interactively inputting geometric parameters and unit material parameters;
the third step comprises the following steps:
assembling the built characteristic wall body components through the connecting units, endowing the stress performance of the joint obtained in the first step to each connecting unit, forming a prefabricated shear wall integral structure finite element model matched with the integral structure three-dimensional CAD model, converting the model into an INP file, storing the INP file into an ABAQUS corresponding working directory, and calling the file under an ABAQUS CAE operating interface to directly generate the prefabricated shear wall integral structure finite element model.
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| CN110532580A (en) * | 2019-01-25 | 2019-12-03 | 中国建筑股份有限公司 | A kind of half refined numerical simulation method of prestressing force prefabricated concrete structure node |
| CN110008625B (en) * | 2019-04-16 | 2022-12-20 | 广东华坤建设集团有限公司 | Finite element analysis research method for structural mechanical property of prefabricated part of fabricated building |
| CN110955989B (en) * | 2019-10-31 | 2024-04-05 | 中国二十冶集团有限公司 | Integral structure finite element modeling method for fabricated precast concrete shear wall |
| CN113177253A (en) * | 2021-05-11 | 2021-07-27 | 安徽建筑大学城市建设学院 | Nonlinear analysis method of novel laminated shear wall |
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| WO2016046796A2 (en) * | 2014-09-26 | 2016-03-31 | Universita' Degli Studi Di Padova | Dissipative connection with optimized stiffness and strength for joining construction elements |
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