Module-concrete core tube connecting structure based on topological optimization technology and assembling method thereof

Abstract

The invention relates to a module-concrete core tube connecting structure based on a topological optimization technology and an assembling method of the module-concrete core tube connecting structure. An upper layer module beam column unit and a lower layer module beam column unit are fixed to a concrete core tube through a connecting plate and an embedded plate by means of bolt holes and bolts. The connecting plate screenshot is in an L shape, the structure of the connecting plate screenshot is designed through the topological optimization technology, the minimum joint strain energy serves as a target function, the structural form of the connecting plate and a module beam column is optimized, the joint force transmission efficiency is improved, and the material consumption is reduced. The upper module beam column unit and the lower module beam column unit are composed of single-side module beam columns, all the parts are formed by fixedly connecting factory prefabricated parts, and modular design is achieved. During assembly, the connecting plate and the embedded plate are fixed firstly; the lower-layer module beam-column unit and the upper-layer module beam-column unit are sequentially fixed by means of the horizontal part of the connecting plate to form a rigid system; and repeating the process to finish the construction of the whole module system. The reliability, the stability and the anti-seismic performance of the connecting joint are remarkably improved, and meanwhile the construction cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of modular buildings, and in particular to a module-concrete core tube connection node and an assembly method thereof based on topological optimization technology, which are suitable for high-rise and super-high-rise modular buildings. Background Art

[0002] As the construction industry faces labor shortages and increasing environmental pressure, modular buildings, as an integrated and industrialized construction model, have shown great market potential due to their advantages such as rapid construction, cost savings and environmental friendliness. Modular buildings can be divided into pure laminated modular structures and module-lateral force resisting systems according to whether there is a separate lateral force resisting system. Among them, the pure laminated modular structure is composed entirely of modules, which only rely on modules and their connection nodes to resist lateral forces, so it generally does not exceed 8 floors; while in the module-lateral force resisting system, the module can bear part of the load, but it is not the main load-bearing component. Further, according to the different types of lateral force resisting systems, it can be divided into module-frame structure, module-concrete core tube structure and module-pier structure. Among them, the module-frame structure can generally only be applied to multi-story buildings. If a higher building needs to be built, it can generally only adopt the module-concrete core tube structure system. The concrete core tube is generally constructed before the surrounding modular structure, and the construction method of cast-in-place or prefabricated components is adopted. In addition, in order to ensure that the lateral load can be effectively transferred from the module to the core tube, it is necessary to strengthen the stiffness of the module floor system and ensure the reliability of the connection node. However, as buildings develop towards multi-story buildings, modular buildings also encounter greater challenges in terms of structural systems, node connections, and construction techniques.

[0003] For high-rise modular buildings, the connection between the module and the concrete core tube lateral resistance system is crucial to the lateral resistance capacity and safety performance of the overall structure. However, there is currently little research on this type of node, and there are huge difficulties and challenges in practical applications. First, compared with the connection node of the pure module structure, the structure of the module-concrete core tube lateral resistance system connection node is more complicated, especially the connection between multiple modules and the core tube. The static and seismic performance and force transmission mechanism of the module-concrete core tube lateral resistance system connection node are not clear, resulting in the overall design of the structure not being scientific and reasonable, affecting the overall cost. Secondly, the concrete core tube lateral resistance system of high-rise modular buildings is generally a cast-in-place structure, and its settlement characteristics are different from those of the module area. Therefore, the module-concrete core tube lateral resistance system connection node must not only meet the coordinated lateral resistance requirements between the two, but also consider the impact of the vertical settlement difference between the two. At the same time, the connection area is often a weak area that is easily damaged. At present, ordinary steel and concrete and other building materials are mostly used, which is difficult to meet the high-performance development needs of modular buildings. However, the application of high-strength steel in modular buildings is still very rare. In addition, the module-concrete core tube lateral resistance system connection node involves the connection between two different structural systems and material types, and its force transmission mechanism and mechanical model are complex and have many influencing factors.

[0004] Therefore, in the module-concrete core tube structure, the reliability and performance of the connection nodes are crucial to the overall structural safety. Existing research on the connection nodes of the module-concrete core tube lateral resistance system has the problems of complex structure, unclear performance, complexity of material selection and force transmission mechanism, resulting in unscientific and unreasonable structural design, and most of them are not detachable, which affects the cost and safety. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a module-concrete core tube connection structure based on topological optimization technology and its assembly method and application, which can reliably connect different steel module units and concrete core tubes together through the structural design of embedded plates, connecting plates and modules, and take into account the influence of construction errors, and has the characteristics of easy installation, flexible rotation, convenient disassembly and assembly, and strong applicability. It meets the needs of rapid construction and reliable connection of high-rise modular buildings, while taking into account the limitations of construction accuracy and construction technology level, and can also ensure the safety and durability of operation and maintenance in the long-term service stage.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A module-concrete core tube connection node based on topological optimization technology comprises: an embedded plate (3), a connecting plate (2), a connecting bolt (6), an upper module beam column (4), and a lower module beam column (5), which are sequentially connected and arranged with each other; the embedded plate (3) and the vertical part (8) of the connecting plate are respectively provided with horizontal bolt holes (7) for fixed connection at corresponding positions; the horizontal part (9) of the connecting plate, the junction of the upper flange of the middle beam node of the lower module beam column (5) and the junction of the lower flange of the middle beam node of the upper module beam column (4) are all provided with bolt holes (7) for connecting and fixing the three parts; the upper (4) and lower module beam column (5) parts are both composed of two single-side module beam columns (13), and the single-side module beam / column is composed of three parts, namely a module cross beam (10), a module longitudinal beam (12) and a module column (11), and each part is fixedly connected by factory prefabricated components.

[0008] Furthermore, the plate members on the vertical portion (8) of the embedded plate (3) and the connecting plate are kept consistent in length in the horizontal direction, and their upper edges are kept aligned in the vertical direction, and the positions of the bolt holes (7) of the two are in one-to-one correspondence in the horizontal and vertical directions, so that the embedded plate (3) and the connecting plate (2) are fixedly connected to form a rigid system;

[0009] Furthermore, the bolt holes (7) at the junction of the upper flange of the middle beam node of the lower module beam column (5), the bolt holes (7) at the junction of the lower flange of the middle beam node of the upper module beam column (4), and the bolt holes (7) of the horizontal part (9) of the connecting plate are concentric circles of equal diameters that correspond one to one in space. The fixed connection between the upper (4) and lower module beam columns (5) and the connecting plate (2) is achieved through the one-to-one correspondence between the bolt holes (7), forming a rigid system that connects the entire system as a whole.

[0010] Furthermore, the structures of the vertical part (8) and the horizontal part (9) of the connecting plate are iteratively optimized using topology optimization technology, with minimum node strain energy as the objective function, volume fraction ratio as the constraint function, continuum structure variable density method as the optimization algorithm, and "unit density" as the design variable;

[0011] First, an optimization model is established, and then the unit density optimization method is used for iterative calculation. Under the condition of meeting the design requirements, the limit value of the objective function is obtained, and finally the optimal design scheme is obtained; the objective function and design variables are usually volume percentage, strain energy, mode, mass and deformation, etc. The objective function and design variables can be converted to each other without affecting the final optimization result;

[0012] The mathematical model of the optimal design is expressed as:

[0013] Min F(X)=F(x 1 ,x2 ,…,x n )

[0014] Find X=(x 1 ,x 2 ,…,x n ) T ∈R

[0015] St g i (X) = g i (x 1 ,x 2 ,…,x n )≤0i=1,2,…,m

[0016] h j (X) = h j (x 1 ,x 2 ,…,x n )=0j=1,2,…,m

[0017] Where: F(X) is the objective function of the design variable; x 1 ,x 2 ,…,x n is the design variable; g i (X), h j (X) are inequality and equality constraints respectively; m is the number of inequality constraints.

[0018] The pre-processing of the optimization analysis requires finite element modeling and setting boundary conditions and loads, and defining design variables, optimization objectives and constraints in the optimization module; the OptiStruct optimization module uses a small step iteration method to seek the optimal solution, and determines whether the optimal solution is reached by comparing the parameters between two adjacent steps. If the optimal solution is reached, the optimization is completed and the cycle ends; otherwise, the iteration continues according to the parameters of the current state until the optimal solution is obtained; the structure of the connecting plate (2) is designed based on its optimization effect. In addition, the vertical part (8) and the horizontal part (9) of the connecting plate (2) are processed and manufactured separately in the factory. The vertical part needs to be adjusted to a certain length according to the on-site construction error, and then the vertical part (8) and the horizontal part (9) are welded to ensure that the upper and lower module units can be smoothly connected to the concrete core tube;

[0019] Furthermore, the longitudinal beam unit (12) and the cross beam unit (10) in the upper (4) and lower module beam columns are optimized by iterative optimization using topology optimization technology, with the minimization of the maximum principal stress of the node material as the objective function, the volume fraction ratio as the constraint function, the continuum structure variable density method as the optimization algorithm, and the unit "unit density" as the design variable;

[0020] First, an optimization model is established, and then the unit density optimization method is used for iterative calculation. Under the condition of meeting the design requirements, the limit value of the objective function is obtained, and finally the optimal design solution is obtained.

[0021] The mathematical model of optimal design can be expressed as:

[0022] Objective function:

[0023] Min max(σ 1i )

[0024] Constraint function:

[0025] σ 1i ≤σ max

[0026] Displacement≤Displacement max

[0027] V min ≤V i ≤V max

[0028] Where: 1i is the maximum principal stress of element i; σ max is the maximum principal stress allowed by the material; Displacement is the displacement of the structure; Displacement max is the maximum displacement allowed by the structure; V min is the minimum permissible value of the volume fraction; V i represents the relative volume occupied by unit i; V max is the maximum allowed value of the volume fraction.

[0029] The pre-processing of optimization analysis requires finite element modeling and setting boundary conditions and loads, and defining design variables, optimization objectives and constraints in the optimization module. The OptiStruct optimization module uses a small step iteration method to seek the optimal solution. By comparing the parameters between two adjacent steps, it is determined whether the optimal solution is reached. If the optimal solution is reached, the optimization is completed and the cycle ends; otherwise, it continues to iterate according to the parameters of the current state until the optimal solution is obtained.

[0030] Furthermore, the assembly method of the module-concrete core tube connection structure based on topology optimization technology comprises the following steps:

[0031] 1) Pour the concrete core tube and place the embedded plate, exposing the end of the embedded plate with the bolt hole and close to the surface of the core tube;

[0032] 2) According to the height requirement of the building structure, the lower beam-column module unit (5) is installed. It is worth noting that the lower beam-column module unit on the first floor of the building structure is connected to the foundation;

[0033] 3) According to the construction error, measure the top elevation of the lower beam-column module unit (5) and adjust the height of the vertical part (8) of the connecting plate. Weld the vertical part (8) and the horizontal part (9) of the connecting plate;

[0034] 4) Install the connection plate (2), and connect it to the embedded end plate (3) and the lower module beam-column unit (5) through bolts (6);

[0035] 5) placing the upper beam-column module unit (4), connecting the upper beam-column module unit (4) and the horizontal part of the connection plate (2) with bolts (6), completing the construction of the first module-concrete core tube connection node, and realizing the connection between the module units and the concrete core tube (1);

[0036] 6) Install subsequent modules in a similar manner to complete the construction of the entire module-concrete core tube connection structure.

[0037] Beneficial Effects The module-concrete core tube connection node based on topology optimization technology provided by the present invention has the following advantages:

[0038] 1. The present invention connects the embedded plate (3), the connecting plate (2), the connecting bolts (6), the upper module beam column (4) and the lower module beam column (5) in sequence through modular design, thereby achieving standardization and reliable connection of each component. The precise arrangement of the bolt holes (7) ensures the rigid connection between the embedded plate (3) and the connecting plate (2), and between the connecting plate (2) and the module beam / column, simplifies the installation process, improves the construction efficiency, and enhances the reliability, stability and lateral force resistance of the overall structure.

[0039] 2. The embedded plate (3) and the connecting plate (2) have the same length in the vertical direction, their upper edges are aligned, and the bolt holes (7) are located one by one, ensuring accurate alignment during installation and reducing construction errors. This design achieves a rigid connection between the embedded plate (3) and the connecting plate (2), forming a stable rigid system and improving the lateral force resistance and earthquake resistance of the overall structure.

[0040] 3. The horizontal part of the connecting plate (2) and the bolt holes (7) of the upper and lower module beams / columns are designed in concentric circles, ensuring that the positions of the bolt holes (7) correspond one to one, simplifying the installation process and improving the construction efficiency. Through the rigid connection of the bolt holes (7), the upper (4) and lower module beams (5) and the connecting plate (2) are firmly connected, and the lateral force resistance and stability of the overall structure are enhanced.

[0041] 4. Through the design method based on topological optimization technology, the structural form of the connecting plate (2) is optimized with the minimum node strain energy as the objective function, which significantly improves the mechanical properties and lateral force resistance of the node. Topological optimization technology reduces the amount of material used, reduces the deadweight of the structure and the construction cost, meets the requirements of green buildings and sustainable development, and ensures the stability and safety of the connecting plate (2) in a complex stress environment.

[0042] 5. By adjusting the height of the vertical portion (8) of the connecting plate (2), the influence of the cumulative construction error is eliminated, and the smooth connection between the module unit, the connecting plate and the concrete core tube is effectively ensured.

[0043] 6. The upper (4) and lower modular beam-column units (5) are both composed of single-side modular beams / columns (13), which are composed of modular cross beams (10), modular longitudinal beams (12) and modular columns (11), thus realizing modular design and being able to flexibly adapt to the needs of different building structures. Each part of the modular beam / column is formed by the fixed connection of prefabricated components in the factory, which reduces the complexity of on-site construction and improves construction efficiency.

[0044] 7. Through the design method based on topological optimization technology, the structural form of the modular beam / column is optimized with the minimization of the maximum principal stress of the node material as the objective function, which significantly improves the mechanical properties and lateral force resistance of the node. Topological optimization technology reduces the amount of materials used, reduces the deadweight of the structure and the construction cost, meets the requirements of green buildings and sustainable development, and ensures the stability and safety of the modular beam / column in a complex stress environment.

[0045] 8. The steps of the assembly method are clear and well-defined, with a high degree of standardization, which reduces construction errors and improves construction efficiency. The influence of construction errors is fully considered during the assembly process, and the reliability and stability of the connection nodes are ensured through precise bolt hole (7) arrangement and modular design. The modular assembly method and standardized design reduce construction costs and meet the needs of rapid construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the assembly of the module-concrete core tube connection structure based on the topology optimization technology of the present invention;

[0047] Figure 2 It is a detailed diagram of the position of the connecting plate of the present invention;

[0048] Figure 3 It is a left view of the node assembly of the present invention;

[0049] Figure 4 is a schematic diagram of the connecting plate 2 of the present invention;

[0050] Figure 5It is a schematic diagram of the upper and lower beam modules of the present invention;

[0051] Figure 6 It is a schematic diagram of the topology optimization of the connection plate of the present invention;

[0052] Figure 7 It is a schematic diagram of the connection effect between the connecting plate 2 and the embedded plate.

[0053] Description of reference numerals:

[0054] 1. Core tube; 2. Connecting plate; 3. Embedded plate; 4. Upper module beams and columns; 5. Lower module beams and columns; 6. Connecting bolts; 7. Bolt holes; 8. Vertical part of connecting plate; 9. Horizontal part of connecting plate; 10. Module cross beam; 11. Module column; 12. Module longitudinal beam; 13. Single-side module beams and columns. DETAILED DESCRIPTION

[0055] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0056] like Figures 1 to 3 As shown, a module-concrete core tube connection structure based on topological optimization technology includes a core tube 1, an embedded plate 3, a connecting plate 2, a connecting bolt 6, an upper module beam-column unit 4 and a lower module beam-column unit 5. The five are rigidly connected by optimizing the shape of the connecting parts, the size and layout of the bolt holes, so as to achieve standardization and reliable connection of the components. The installation process is simplified, the construction efficiency is improved, and the reliability, stability and lateral force resistance of the overall structure are enhanced.

[0057] The structure of the connecting plate 2 is iteratively optimized by using topology optimization technology, taking the minimum node strain energy as the objective function, the volume fraction ratio as the constraint function, the continuum structure variable density method as the optimization algorithm, and the "unit density" as the design variable. Specifically, the cross section of the connecting plate 2 is "L" shaped, and the horizontal part 9 and the vertical part 8 are welded together after being processed separately in the factory. In this embodiment, the vertical part is close to an isosceles trapezoid, and the horizontal part is a rectangle.

[0058] Bolt holes are provided at the intersection of the embedded plate 3, the vertical part 8 of the connecting plate, the horizontal part 9 of the connecting plate, and the flanges of the upper and lower module beams / columns to ensure the consolidation of the module beams / columns and the connecting plate 2. The upper and lower module beam-column units are composed of two single-sided module beams / columns 9, each of which is composed of a module cross beam 10, a module longitudinal beam 12, and a module column 11, and each part is consolidated by prefabricated components in the factory.

[0059] During assembly, the concrete core tube 1 will first be poured on the construction site to ensure that its strength and geometric dimensions meet the design requirements, and that the embedded plate 3 is in the designed position so that one end of the pre-installed bolt hole is exposed and close to the surface of the core tube 1. Use measuring tools to check the position and elevation of the embedded plate 3 to ensure that the error between it and the design drawing is controllable, and also provide measured data support for adjusting the vertical part 8 of the connecting plate.

[0060] Subsequently, the installation position of the lower beam-column module unit 5 is determined according to the height requirements of the building structure, especially the lower module beam-column unit of the first floor needs to be firmly connected to the foundation. The lower module beam-column unit 5 is hoisted to the designed position using lifting equipment to ensure its horizontality and verticality. After hoisting in place, the module unit is fixed with temporary supports or clamps to prevent it from shifting during the subsequent installation process.

[0061] After that, use the total station to measure the top elevation of the lower beam-column module unit 5 to ensure that the error with the design elevation is controllable. After installation, measure the top elevation of the lower module unit, determine the appropriate height of the vertical part 8 of the connecting plate based on the measurement results, and adjust it. Then, weld the vertical part 8 and the horizontal part 9 of the connecting plate to reduce the influence of construction errors and ensure that the connecting plate 2 can be smoothly connected with the embedded plate 3 and the module unit.

[0062] Install the connecting plate 2, making sure it corresponds to the bolt holes 7 of the embedded plate 3 and the module unit. Use the connecting bolts 6 to fix the connecting plate to the embedded plate 3 and the lower module beam-column unit 5 to form a rigid system. Ensure that the connection is firm and check the alignment of the connecting plate 2 with the embedded plate 3 and the module unit.

[0063] Finally, use the lifting equipment to lift the upper module beam-column unit 4 to the designed position, ensuring that it is aligned with the horizontal part 9 of the connecting plate. Use bolts 6 to fix the upper module beam-column unit 4 to the horizontal part 9 of the connecting plate, ensuring that the positions of the bolt holes 7 correspond one to one. Ensure that the connection is firm, and check the alignment of the upper module beam-column unit 4 and the horizontal part 9 of the connecting plate.

[0064] Follow the above steps to install the subsequent module units in sequence. Each time you install a layer of module units, you need to measure the elevation, process the connection plates, install the connection plates and fix the module units. After all the module units are installed, check the entire structure as a whole to ensure the firmness and alignment of each connection point, check the tightening torque of the bolts, and ensure that all connection points meet the design requirements.

[0065] Example 1

[0066] In order to verify the stiffness and bearing capacity performance of the module-concrete core tube connection node based on topology optimization technology in the present invention, the present invention performs detailed calculation and analysis through a specific example. During the calculation process, it is assumed that Q235 steel is used as the main material, and its material parameters are as follows:

[0067] To ensure the bearing capacity of the optimized combined node, the density is 7.850g / cm 3 The elastic modulus of the steel used is 206GPa, the shear modulus is 79GPa, the tensile yield strength is 235MPa, and the shear strength is 130MPa.

[0068] (1) Topological optimization analysis of the connecting plate

[0069] As a key force transmission component in the node, the design of the connecting plate directly affects the overall performance of the node. The present invention uses topology optimization technology to optimize the design of the connecting plate, takes node strain energy minimization as the objective function, and uses the volume fraction ratio as the constraint condition to perform iterative optimization through the continuum structure variable density method.

[0070] Assume that the volume dimensions of the vertical part 8 of the connecting plate are 600×300×20 mm, the long side dimension of the horizontal part of the connecting plate is 600 mm, the short side dimension is 320 mm, and the two sides in the horizontal direction are smoothly transitioned by symmetrical double-sided arc gradients with a radius of 640 mm and a length of 412 mm. Figure 6 shown.

[0071] The mathematical model of the optimal design is expressed as:

[0072] Min F(X)=F(x 1 ,x 2 ,…,x n )

[0073] Find X=(x 1 ,x 2 ,…,x n ) T ∈R

[0074] St g i (X) = g i (x 1 ,x 2 ,…,x n )≤0i=1,2,…,m

[0075] h j (X) = h j (x 1 ,x 2 ,…,x n )=0j=1,2,…,m

[0076] Where: F(X) is the objective function of the design variable; x 1 ,x 2 ,…,x n is the design variable; g i (X), h j (X) are inequality and equality constraints respectively; m is the number of inequality constraints;

[0077] After topology optimization, the changes are shown in the following table:

[0078]

[0079] Note: Relative error = 0.003993%

[0080] It can be seen from the table that after topology optimization, the mass and volume of the connecting plate are reduced by 17.83% and 17.72% respectively. This not only optimizes the geometric shape of the connecting plate and reduces stress concentration, but also ensures the structural stability and load transfer efficiency of the connecting plate under complex stress environments, while meeting the lightweight design goal of topology optimization.

[0081] (2) Upper and lower module beam-column units

[0082] As the main load-bearing components in modular buildings, the upper and lower modular beam-column units are also optimized using topology optimization technology. The optimization goal is to minimize the maximum principal stress of the node material, and the constraint condition is the volume fraction ratio.

[0083] Assume that the cross-sectional dimensions of the square steel tubes used to make the initial modular columns and beams are 160×10 mm, the length of the modular cross beam is 440 mm, the length of the modular column is 610 mm, and the length of the modular longitudinal beam is 500 mm. Figure 5 shown.

[0084] The mathematical model of optimal design can be expressed as:

[0085] Objective function:

[0086] Min max(σ 1i )

[0087] Constraint function:

[0088] σ 1i ≤σ max

[0089] Displacement≤Displacement max

[0090] V min ≤V i ≤V max

[0091] Where: 1i is the maximum principal stress of element i; σ max is the maximum principal stress allowed by the material; Displacement is the displacement of the structure; Displacement max is the maximum displacement allowed by the structure; V min is the minimum permissible value of the volume fraction; V i represents the relative volume occupied by unit i; V max is the maximum allowed value of the volume fraction.

[0092] After topology optimization, the quality and volume of the upper and lower module beam-column units have also been significantly improved. The comparison before and after optimization is shown in the following table:

[0093]

[0094] Note: Relative error = 0.000014%

[0095] It can be seen that: (1) After topological optimization, the mass and volume of the connection plate and the upper and lower module beam-column units have been significantly improved, and the material consumption has been reduced from 42.74% to 3.4%, while ensuring the mechanical properties of the node. (2) Topological optimization technology not only improves the mechanical properties of the node, but also significantly reduces the material consumption and construction costs, which meets the requirements of green buildings and sustainable development. (3) According to the specific design case, the size parameters of the connection plate and the upper and lower module beam-column units can be adjusted to meet the overall requirements of the building size.

[0096] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A module-concrete core tube connection structure based on topology optimization technology, characterized in that: include: Core tube (1), embedded plate (3), connection plate (2), connection bolts (6), upper module beam-column unit (4), lower module beam-column unit (5); The connecting plate (2) has an L-shaped cross section, and both the horizontal and vertical parts are provided with threaded holes; The embedded plate (3) is arranged in the wall of the core tube (1), and the embedded plate (3) is connected to the vertical part of the connecting plate through bolt holes and connecting bolts; The upper and lower module beam-column units are simultaneously connected to the horizontal part of the connection plate through bolt holes and connection bolts; The connecting plate (2) structure is optimized through iterative optimization using topology optimization technology, with the minimum node strain energy as the objective function, the volume fraction ratio as the constraint function, the continuum structure variable density method as the optimization algorithm, and the unit density as the design variable; the upper and lower module beam-column mid-beam units are optimized through iterative optimization using topology optimization technology, with the minimization of the maximum principal stress of the node material as the objective function, the volume fraction ratio as the constraint function, the continuum structure variable density method as the optimization algorithm, and the unit density as the design variable.

2. According to the topology optimization technology-based module-concrete core tube connection structure of claim 1, it is characterized in that: The lower module beam-column unit (5), the connection plate (2) and the upper module beam-column unit (4) are connected by bolts after aligning the bolt holes in the horizontal part of the connection plate, the bolt holes at the junction of the upper flange of the middle beam node of the lower module beam-column unit (5) and the bolt holes at the junction of the lower flange of the middle beam node of the upper module beam-column unit (4). The above connection method connects the embedded plate (3), the connection plate (2) and the upper and lower module beam-column units into one.

3. A module-concrete core tube connection structure based on topology optimization technology according to claim 1 or 2, characterized in that: The vertical parts of the embedded plate (3) and the connecting plate are consistent in length in the horizontal direction, and their upper edges are aligned in the vertical direction. The positions of the bolt holes of the two are in one-to-one correspondence in the horizontal and vertical directions, so that the embedded plate (3) and the connecting plate (2) are fixedly connected in the vertical direction to form a rigid system.

4. A module-concrete core tube connection structure based on topology optimization technology according to claim 1 or 2, characterized in that: The bolt holes at the junction of the upper flange of the beam node of the lower module beam-column unit (5), the bolt holes at the junction of the lower flange of the beam node of the upper module beam-column unit (4), and the bolt holes (7) in the horizontal part of the connecting plate are more than one set of concentric circles of equal diameter corresponding to each other in space. The fixed connection between the upper and lower module beam-column units and the connecting plate (2) is achieved through the one-to-one correspondence between the bolt holes, forming a rigid system to connect the entire system as a whole.

5. According to the topology optimization technology-based module-concrete core tube connection structure of claim 1, it is characterized in that: The structural optimization process of the connecting plate (2) is as follows: First, an optimization model is established, and then the unit density optimization method is used for iterative calculation. Under the condition of meeting the design requirements, the limit value of the objective function is obtained, and finally the optimal design scheme is obtained; the objective function and design variables include but are not limited to volume percentage, strain energy, mode, mass and deformation, and the objective function and design variables can be converted to each other without affecting the final optimization result; The mathematical model of the optimal design is expressed as: Let F(X)=F(x1,x2,…,x n ) Find X=(x1,x2,…,x n ) T ∈R S.t g i (X)=g i (x1,x2,…,x n )≤0i=1,2,…,m h j (X)=h j (x1,x2,…,x n )=0j=1,2,…,m Where: F(X) is the objective function of the design variables; x1, x2,…, x n is the design variable; g i (X), h j (X) are inequality and equality constraints respectively; m is the number of inequality constraints; The pre-processing of the optimization analysis requires finite element modeling and setting boundary conditions and loads, and defining design variables, optimization objectives and constraints in the optimization module; the OptiStruct optimization module adopts a small step iteration method to seek the optimal solution, and judges whether the optimal solution is reached by comparing the parameters between two adjacent steps. If the optimal solution is reached, the optimization is completed and the cycle ends; otherwise, the iteration continues according to the parameters of the current state until the optimal solution is obtained; the structure of the connecting plate (2) is designed based on its optimization effect.

6. The module-concrete core tube connection structure based on topology optimization technology according to claim 5 is characterized in that: The vertical part (8) and the horizontal part (9) of the connecting plate (2) are processed and manufactured separately in a factory, and welded together after adjusting the height on site, wherein the vertical part is close to an isosceles trapezoid, and the horizontal part is a rectangle with both sides in the horizontal direction smoothly transitioned by symmetrical bilateral arc gradients, and threaded holes are symmetrically distributed on it; the horizontal part is provided with a chamfer to ensure that the end size can meet the load-bearing requirements, and the other end does not extend out of the module beam flange to affect the aesthetics of the module unit.

7. The module-concrete core tube connection structure based on topology optimization technology according to claim 1 is characterized in that: The upper and lower modular beam-column units are both composed of two single-sided modular beams / columns (13), wherein the single-sided modular beams / columns (13) include a modular cross beam (10), a modular longitudinal beam (12) and a modular column (11), and the ends of the three are aligned and fixed as a whole.

8. The module-concrete core tube connection structure based on topology optimization technology according to claim 1 or 7, characterized in that: The module unit uses square steel tubes as side columns and I-beams as longitudinal and transverse beams, which can create construction space for connecting different modules; stiffening ribs are set in the core area of ​​the connection node of the I-beam.

9. The module-concrete core tube connection structure based on topology optimization technology according to claim 1 or 7, characterized in that: The optimization process of the upper and lower module beam-column mid-beam unit structure is as follows: First, the optimization model is established, and then the unit density optimization method is used for iterative calculation. Under the condition of meeting the design requirements, the limit value of the objective function is obtained, and finally the optimal design solution is obtained; The mathematical model of optimal design can be expressed as: Objective function: Min max(s 1i ) Constraint function: s 1i ≤σ max Displacement≤Displacement max In min ≤V i ≤V max Where: 1i is the maximum principal stress of element i; σ max is the maximum principal stress allowed by the material; Displacement is the displacement of the structure; Displacement max is the maximum displacement allowed by the structure; V min is the minimum permissible value of the volume fraction; V i represents the relative volume occupied by unit i; V max is the maximum permissible value of the volume fraction; The pre-processing of the optimization analysis requires finite element modeling and setting boundary conditions and loads, defining design variables, optimization objectives and constraints in the optimization module; the OptiStruct optimization module uses a small step iteration method to seek the optimal solution, and determines whether the optimal solution is reached by comparing the parameters between two adjacent steps. If the optimal solution is reached, the optimization is completed and the cycle ends; otherwise, the iteration continues according to the parameters of the current state until the optimal solution is obtained.

10. The assembly method of a module-concrete core tube connection structure based on topology optimization technology according to claim 1 is characterized in that: Here are the steps: 1) Casting the concrete core tube and placing the embedded plate (3), exposing the end of the embedded plate with the bolt hole close to the surface of the core tube; 2) installing the lower beam-column module unit (5) according to the height requirement of the building structure; wherein the lower beam-column module unit of the first floor of the building structure is connected to the foundation; 3) According to the construction error, measure the top elevation of the lower beam-column module unit (5), and adjust the height of the vertical portion (8) of the connecting plate according to the construction error; then weld the vertical portion (8) and the horizontal portion (9) of the connecting plate; 4) Install the connection plate (2), fix the vertical part of the connection plate (2) to the embedded plate, and fix the lower module beam-column unit (5) through the connection plate and the embedded plate (3); 5) placing an upper layer beam-column module unit (4) above the lower layer module beam-column unit (5), and connecting the upper layer module beam-column unit (4) and the horizontal part of the connecting plate (2) with bolts to achieve connection between the module units and with the concrete core tube (1); 6) Install subsequent modules in the same way.

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