Fabricated lattice type steel reinforced concrete composite structure and design and construction method

Abstract

The invention relates to a fabricated lattice type steel reinforced concrete composite structure and a design and construction method, the structure is a concrete frame-shear wall structure or a concrete frame-core tube structure, and the fabricated lattice type steel reinforced concrete composite structure comprises a prefabricated column, a prefabricated shear wall, a prefabricated beam and a floor slab; the prefabricated columns, the prefabricated shear walls and the prefabricated beams all comprise lattice type frameworks and encased concrete, the lattice type frameworks are composed of longitudinal stress steel ribs and transverse batten materials, main bodies of the lattice type frameworks are embedded in the encased concrete, and the ends of the main bodies of the lattice type frameworks are provided with outwards-extending steel rib sections. The prefabricated columns, the prefabricated shear walls and the prefabricated beams are connected on site through the overhanging steel rib sections to form joints. Compared with the prior art, the structure performance and economical efficiency are excellent, the connection mode and integrity are efficient and reliable, the construction speed is increased, the application adaptability and flexibility are wide, and the construction controllability and quality guarantee are good.

Description

Technical Field

[0001] This invention relates to the field of prefabricated civil engineering technology, and in particular to a prefabricated lattice-type steel-reinforced concrete composite structure and its design and construction methods. Background Technology

[0002] With the continuous advancement of industrialized construction, prefabricated buildings have been widely used in low-rise and mid-rise buildings due to their advantages such as short construction cycle, high resource utilization rate, and minimal environmental impact. Prefabricated structures refer to a building form in which the main structural components are prefabricated in a factory and transported to the construction site for assembly. Compared with traditional cast-in-place construction methods, this method has significant advantages such as faster construction speed, stable and reliable quality, and shorter development cycle, meeting the development needs of industrialized construction.

[0003] From the perspective of structural materials, engineering structures can be divided into concrete structures, steel structures, and composite structures. Steel structures, as a naturally prefabricated system, have a high degree of assembly and a wide range of applications. However, their compatibility with building envelope systems is poor, and there is a lack of standardized "three-panel" components that integrate thermal insulation, sound insulation, waterproofing, and decoration, making them prone to problems such as water seepage, leakage, and insufficient thermal insulation and fire resistance. Furthermore, the irregular cross-sectional shape of steel structures affects the decoration and comfort of interior spaces; their poor fire resistance and corrosion resistance require additional protective measures, increasing later maintenance costs and resulting in low economic efficiency, making it difficult to meet the needs of residential buildings in my country.

[0004] There are still many technical challenges in the connection methods of prefabricated reinforced concrete structures. Common connection methods include wet connection and dry connection: wet connection usually adopts the grouting sleeve connection technology, which involves inserting the exposed reinforcing bars of adjacent prefabricated components into sleeves and injecting high-strength grout on site to form a connection. In theory, this method can achieve good structural integrity, but it faces multiple challenges in actual construction. First, exposed reinforcing bars are prone to bending or deformation during processing, transportation, and hoisting, leading to difficulties in on-site alignment and affecting connection accuracy and construction efficiency. Second, the joints have no load-bearing capacity before the grout hardens and cannot bear the loads during the construction stage, requiring additional temporary support systems, increasing the construction period and cost; after the grout hardens, there is also the problem of discontinuity in the reinforcing bars. In addition, when the spacing between reinforcing bars is small, a large number of sleeves are needed. Since the outer diameter of the sleeve is 2 to 3 times the diameter of the reinforcing bar, the space left for concrete is narrow. Even with factory production, it is not easy to guarantee the quality of the concrete in this area, and the grouting construction is sensitive to environmental conditions, easily affected by factors such as temperature and humidity, making it difficult to consistently control the on-site construction quality. Dry connections involve pre-embedding connectors (such as steel plates, bolts, and welded parts) in prefabricated components, and then assembling the components on-site using bolts or welding. This method offers faster construction speed and is less affected by environmental factors, but its connection stiffness is insufficient, making it difficult to achieve the same overall performance as cast-in-place structures. This is especially true in high-rise buildings, where the structural system has high requirements for the seismic performance of connection nodes. Dry connections can hardly meet the mechanical performance standards of "equivalent to cast-in-place," resulting in poor structural integrity and insufficient seismic resistance. Furthermore, exposed steel at the joints often poses fire and corrosion problems, further affecting the structure's durability and safety.

[0005] Steel-concrete composite structures utilize the collaborative work of steel and concrete to bear external loads, combining the ductility of steel with the durability of concrete. Their structural members are generally formed by solid-web steel sections encased in concrete, with reinforcing bars distributed around the steel sections. This structure exhibits good fire resistance, corrosion resistance, and seismic performance. It features small column sections, and some components can double as formwork, accelerating construction and making it suitable for standardized factory production, simplifying on-site construction processes. It is a relatively ideal form of prefabricated structure. However, this structure still suffers from problems such as discontinuous reinforcement at the connections between main beams, secondary beams, and columns, complex steel section configurations, difficult connections, and inconvenient concrete pouring.

[0006] From the perspective of component form, beams and columns are linear components, making prefabrication relatively easy; floor slabs are horizontal load-bearing components, and composite floor slabs only require a prefabricated base slab as a template for the entire floor slab casting, making prefabrication relatively less difficult; shear walls are vertical load-bearing components, with diverse types of connecting components and complex connection node designs, making prefabrication extremely difficult. Furthermore, the currently proposed composite slab shear walls also have several problems: ① indirect lap splicing of vertical node reinforcement leads to poor load-bearing performance; ② the wall panels are heavy and bulky, making transportation and hoisting difficult; ③ the wall panel production process is complex, requiring the wall panel orientation to be reversed, resulting in a long production cycle.

[0007] From a structural system perspective, building structures mainly include frame structures, shear wall structures, frame-shear wall structures, and frame-core tube structures. Frame structures consist of beams and columns connected by rigid joints to form a spatial skeleton system. They offer flexible floor plan layout, strong plastic deformation capacity, and low structural weight. However, they are prone to significant lateral deformation under horizontal loads, leading to a decrease in overall load-bearing capacity and limiting building height; relevant codes typically restrict their height to no more than 40 meters. Shear wall structures consist of shear walls and floor slabs, bearing horizontal loads through reinforced concrete walls. They offer high lateral stiffness, good integrity, and excellent seismic performance. However, because floor slab spans are generally limited to 3-4 meters (rarely exceeding 5 meters), and shear wall spacing cannot be too large, the flexibility of the building's floor plan layout is insufficient, making it difficult to meet the functional requirements of public buildings. They are mainly suitable for residential buildings with small spans. Frame-shear wall structures combine the advantages of both, possessing both good layout flexibility and ductility, as well as high lateral stiffness, making them one of the commonly used structural systems for high-rise buildings. Frame-core tube structures consist of an outer frame and an inner core tube. The core tube bears horizontal loads, while the frame bears vertical loads. They offer superior overall stiffness and stability, excellent spatial performance, and are widely used in high-rise buildings. Currently, frame-core tube structures typically employ a combination of a steel frame and a concrete core tube. This design fully integrates the advantages of rapid assembly of steel structures with the superior stiffness and load-bearing capacity of concrete structures, improving both construction efficiency and the overall stability and seismic resistance of the building. However, steel frame-core tube structures still have some limitations. They generally employ simultaneous but unequal-height construction techniques, often making it difficult to meet construction schedule requirements. Furthermore, the addition of reinforcing bars to the core tube floor slabs increases the difficulty of formwork assembly. Additionally, in steel frame-concrete core tube structures, the floor slabs of the frame structure are not connected to the core tube section, resulting in weaker overall structural integrity. Specifically, the frame and the inner core tube are mainly connected by beams, including hinged connections at both ends, rigid connections between the outer frame and the inner tube, and rigid connections at both ends. All three connection methods have certain limitations: ① Hinged connections at both ends simplify the construction of beam / wall joints, requiring only embedded parts in the outer frame columns and shear wall core tubes, with high-strength bolts connecting the steel beam web to the embedded parts. However, bending moments cannot be transferred in the joint area, resulting in the lowest efficiency of collaboration between the outer frame and the inner core tube. ② Rigid connections of the outer frame / hinged connections of the inner tube still suffer from the problem of bending moments not being transferred in the joint area at the shear wall core tube location on one side, and the low efficiency of collaboration between the outer frame and the inner core tube. ③ Rigid connections at both ends, while able to fully transfer bending moments in the joint area and ensure collaboration between the outer frame and the inner core tube, result in complex joint design and the inability to create a height reduction area at the steel beam ends, significantly impacting the building's net height and failing to meet the structural floor height restrictions for high-rise buildings.

[0008] From a seismic performance perspective, reinforced concrete shear walls have high stiffness and load-bearing capacity, but relatively low lag time to shear failure; pure frame structures have low lateral stiffness and relatively low load-bearing capacity. In contrast, frame-shear wall systems have high stiffness, allowing the shear walls to withstand the majority of seismic forces during earthquakes, while the external frame bears the vertical forces. The "Technical Specification for Concrete Structures of High-Rise Buildings" stipulates that, in seismic design, the seismic shear force borne by the frame columns of each story in a steel frame-reinforced concrete tube structure should not be less than the lesser of 25% of the total shear force at the bottom of the structure and 1.8 times the maximum seismic shear force of the frame portion, ensuring that the frame can act as a second line of defense.

[0009] Currently, although prefabricated concrete frame structures have seen some application, their insufficient lateral stiffness leads to significant inter-story displacement under horizontal loads (wind, earthquakes), and limitations on construction height make them unsuitable for high-rise buildings. Prefabricated concrete shear wall structures, due to the difficulty in handling the horizontal connection of prefabricated wall panels, struggle to achieve the same performance as cast-in-place concrete structures, thus limiting their application to multi-story buildings in areas with lower seismic fortification requirements. Furthermore, with the rapid development of my country's construction industry, building structures are becoming more diverse in appearance, and the application of various irregular structures places higher demands on construction techniques.

[0010] Although frame-shear wall structures or frame-core tube structures combine the advantages of shear wall structures and frame structures, the promotion of prefabricated technology in high-rise buildings still faces many challenges, specifically in the connection of components. Prefabricated concrete structure connection technologies, primarily based on wet or dry connections, still suffer from the following problems: ① High construction precision requirements and poor fault tolerance; ② Lack of load-bearing capacity during construction, necessitating complex temporary support systems and limiting construction speed; ③ Complex connection methods in joint areas, making it difficult to guarantee construction quality; ④ Lack of effective connections between floor slabs and prefabricated wall panels, resulting in poor overall structural integrity.

[0011] In conclusion, the application of prefabricated construction in high-rise and multi-story buildings remains a significant technical challenge for the industry. Therefore, there is an urgent need to develop a new type of prefabricated structural system that is highly industrialized, efficient in construction, easy to connect, safe and reliable, possesses excellent mechanical properties, and is economical and durable, in order to promote technological innovation and high-quality development in the construction industry. Summary of the Invention

[0012] The purpose of this invention is to overcome the shortcomings of the prior art and provide a prefabricated lattice-type steel-reinforced concrete composite structure and its design and construction method. This structure and method possess superior structural performance and economy, efficient and reliable connection methods and integrity, can accelerate construction speed, and has wide application adaptability and flexibility, as well as good construction controllability and quality assurance.

[0013] The objective of this invention can be achieved through the following technical solutions: This invention provides a prefabricated lattice-type steel-reinforced concrete composite structure, which is a concrete frame-shear wall structure or a concrete frame-core tube structure, including: precast columns, precast shear walls, precast beams and floor slabs; The precast columns, precast shear walls and precast beams all include a lattice frame and an outer concrete casing. The lattice frame is composed of longitudinal load-bearing steel members and transverse bracing. The main body of the lattice frame is embedded in the outer concrete casing, and the ends have protruding steel member segments. The precast columns, precast shear walls, and precast beams are connected on-site through the extended steel segments to form nodes.

[0014] Once the steel frame connection is completed, the node can bear the construction load, allowing the pouring and curing of the post-grouting material in the node area to be carried out simultaneously with the assembly of the upper structure.

[0015] Furthermore, the composite structure is a concrete frame shear wall structure, including a first frame section and a shear wall section; The first frame section includes a first lattice steel-reinforced concrete composite column and a first lattice steel-reinforced concrete composite beam, and the shear wall section includes a first lattice steel-reinforced concrete composite shear wall, wherein the shear wall section is distributed inside the first frame section; The precast columns are first-lattice steel-reinforced concrete composite columns, the precast shear walls are shear wall sections, and the precast beams are first-lattice steel-reinforced concrete composite beams.

[0016] Furthermore, the first frame portion also includes a first beam-column joint, a first column-column joint, and a first beam-beam joint; the shear wall portion also includes a first wall-column joint and a first wall-beam joint. The first lattice-structured steel-reinforced concrete composite column is connected to the first lattice-structured steel-reinforced concrete composite beam at the first beam-column node; the first lattice-structured steel-reinforced concrete composite column is connected to the first lattice-structured steel-reinforced concrete composite shear wall at the first wall-column node; the first lattice-structured steel-reinforced concrete composite shear wall is connected to the first lattice-structured steel-reinforced concrete composite beam at the first wall-beam node; the first lattice-structured steel-reinforced concrete composite columns are connected to each other at the first column-column node; the first lattice-structured steel-reinforced concrete composite beams are connected to each other at the first beam-beam node. The first beam-column joint and the first wall-beam joint are prefabricated in the factory and are prefabricated in the first lattice steel-reinforced concrete composite column and the first lattice steel-reinforced concrete composite beam, transforming the beam-column connection and the primary and secondary beam connection into a beam-beam connection. The first column-column node, the first beam-beam node, and the first wall-column node include steel frame connection sections formed by bolted connections, welding, or a combination of bolted and welded connections, and post-cast grout. The post-cast grout is ordinary concrete, fine aggregate concrete, grouting material, high-performance concrete, or ultra-high-performance concrete.

[0017] Furthermore, the composite structure is a concrete frame core tube structure, including a second frame section located around the perimeter and a core tube section located in the middle. The second frame section includes second lattice steel-reinforced concrete composite columns and second lattice steel-reinforced concrete composite beams, while the core tube section includes second lattice steel-reinforced concrete composite shear walls. The precast columns are second-lattice steel-reinforced concrete composite columns, the precast shear walls are the core tube section, and the precast beams are second-lattice steel-reinforced concrete composite beams.

[0018] Furthermore, the second frame portion also includes a second beam-column joint, a second column-column joint, and a second beam-beam joint; the core tube portion also includes a second wall-column joint and a second wall-beam joint. The second lattice-structured steel-reinforced concrete composite column is connected to the second lattice-structured steel-reinforced concrete composite beam at the second beam-column joint; the second lattice-structured steel-reinforced concrete composite column is connected to the second lattice-structured steel-reinforced concrete composite shear wall at the second wall-column joint; the second lattice-structured steel-reinforced concrete composite shear wall is connected to the second lattice-structured steel-reinforced concrete composite beam at the second wall-beam joint; the second lattice-structured steel-reinforced concrete composite columns are connected to each other at the second column-column joint; the second lattice-structured steel-reinforced concrete composite beams are connected to each other at the second beam-beam joint. The second beam-column joint and the second wall-beam joint are prefabricated in the factory and are prefabricated in the second lattice steel-reinforced concrete composite column and the second lattice steel-reinforced concrete composite beam, transforming the beam-column connection and the primary and secondary beam connection into a beam-beam connection. The second column-column joint, the second beam-beam joint, and the second wall-column joint include steel frame connection sections formed by bolted connections, welding, or a combination of bolted and welded connections, and post-cast grout. The post-cast grout is ordinary concrete, fine aggregate concrete, grouting material, high-performance concrete, or ultra-high-performance concrete.

[0019] Furthermore, the longitudinal load-bearing steel frame is rolled steel, welded steel, or cold-formed steel.

[0020] Furthermore, the transverse bracing material is a bracing plate, bracing strip, or stirrup.

[0021] Furthermore, the floor slab is a composite floor slab, a precast reinforced concrete floor slab, or a steel truss floor slab.

[0022] This invention also provides a design method for a prefabricated lattice-type steel-reinforced concrete composite structure, comprising: S1. Construction Stage Design: Determine the construction load based on the number of assembly layers; analyze the stress on lattice steel-reinforced concrete composite components such as beams, columns, and walls during the construction stage; verify and design to determine the steel cross-sectional dimensions; verify the bearing capacity of splicing nodes and connection nodes during the construction stage; ensure that they are in an elastic state; S2. Overall stability verification during the service phase: internal force analysis and overall structural stability verification during the service phase, including critical load, structural stiffness verification, structural stiffness-to-weight ratio and overall overturning verification; S3. Seismic verification during the service phase: overall seismic performance analysis and seismic verification of the structure during the service phase, including elastic verification of the structure under frequent earthquakes, elastic-plastic deformation verification of the structure under rare earthquakes, and elastic-plastic deformation verification considering the P-Δ effect; S4. Component verification during service phase: Component section verification and design during service phase, including calculation of the flexural bearing capacity of the normal section, calculation of the shear and torsional bearing capacity of the inclined section, fire resistance limit verification, and bearing capacity calculation of each node for lattice steel-concrete composite columns, lattice steel-concrete composite beams, and lattice steel-concrete composite shear walls. S5. Serviceability Limit State Verification: Serviceability limit state verification during the service phase, including verification of crack width in the normal section and deflection of flexural members.

[0023] This invention also provides a construction method for a prefabricated lattice-type steel-reinforced concrete composite structure, comprising the following steps: A1. The lower-level components are hoisted into place and connected to the foundation or the already installed components through the extended steel sections. The connection of the extended steel sections forms a steel connection section, which can bear the construction load of the node grout pouring, curing layer and component assembly layer. A2. After the components are assembled, the component assembly layer is transformed into a joint grout pouring and curing layer. The pouring and curing of the joint grout are carried out simultaneously with the assembly of the upper components. After the grout is poured and cured, a finished layer is formed, and the joint can withstand the load during the service stage.

[0024] A3. Repeat steps A1 and A2, constructing layer by layer upwards until the installation of the entire structural system is completed.

[0025] When the total structural height is low, the first lattice steel-reinforced concrete composite shear wall and the second lattice steel-reinforced concrete composite shear wall may not be required.

[0026] Compared with the prior art, the present invention has the following advantages: (1) Superior structural performance and economy. The precast beams, columns and shear walls used are all lattice-type steel-reinforced concrete composite components. Compared with traditional reinforced concrete structures, it has a stronger load-bearing capacity, can reduce the cross-sectional size of components and reduce the amount of concrete used; compared with reinforced concrete (steel-concrete composite) structures, it can reduce the amount of steel used; compared with pure steel structures, since the concrete covers the steel frame, no additional fire protection measures are required, the fire resistance and durability are better, and the later maintenance costs can be reduced.

[0027] (2) Highly efficient and reliable connection method and integrity. The components are mainly connected through the exposed steel ends (bolt, welding or a combination of bolt and weld), which is convenient and efficient to construct. The steel connection is wrapped with post-cast concrete to form a composite node. This connection method constitutes a continuous lattice steel frame load-bearing system, which improves the bending, shear and torsional stiffness of the node area, ensures the reliable transmission of internal forces, and avoids the problems of discontinuous reinforcement and unclear stress in traditional wet connections (such as grouting sleeves).

[0028] (3) Accelerate construction speed. Once the components are connected by steel frames, a complete steel frame capable of withstanding construction loads is formed. This allows for simultaneous assembly of the upper structure and pouring and curing of concrete for the lower nodes after the first-floor structure is assembled, without waiting for the post-poured concrete in the joint area to harden. This "synchronous" assembly line operation eliminates the need for a complex temporary support system, thereby significantly accelerating the construction progress.

[0029] (4) Wide range of applications and flexibility. Flexible spatial layout, adaptable to various building plans and functional requirements, especially suitable for high-rise and super high-rise buildings. Applicable to two mainstream high-rise structural systems: frame-shear wall and frame-core tube, effectively solving the problems of high construction difficulty and low efficiency of existing high-rise prefabricated structures. At the same time, shear walls may not be required when the total structural height is low.

[0030] (5) Good construction controllability and quality assurance. The lattice steel frame has high overall rigidity and high processing precision, which is conducive to the precise alignment and rapid assembly of components on the construction site. The complex beam-column and wall-beam joints are prefabricated in the column or wall in the factory, simplifying the on-site connection to beam-beam connection, reducing the difficulty of on-site construction and helping to ensure the quality of the project. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the prefabricated lattice steel-reinforced concrete composite structure of Example 1.

[0032] Figure 2 This is a schematic diagram of the prefabricated lattice steel-reinforced concrete composite structure of Example 2.

[0033] Figure 3This is a schematic diagram of the shear wall-beam joint of the prefabricated lattice steel-reinforced concrete composite structure in Example 1.

[0034] Figure 4 This is a schematic diagram of the force transmission path of the prefabricated lattice steel-reinforced concrete composite structure in Example 1.

[0035] Figure 5 This is a schematic diagram of the construction stages of a prefabricated lattice-type steel-reinforced concrete composite structure.

[0036] Figure 6 A flowchart illustrating the construction process of a prefabricated lattice-type steel-reinforced concrete composite structure.

[0037] Figure 7 This refers to the assembly unit of beams, columns, and shear wall components of the prefabricated lattice-type steel-reinforced concrete composite structure in Example 1.

[0038] Figure 8 Example 1 is an assembly unit for prefabricated lattice-type steel-reinforced concrete composite structure beams, columns, and shear wall components using steel-reinforced concrete composite floor slabs.

[0039] Figure 9 Example 1 is an assembly unit for prefabricated lattice-type steel-reinforced concrete composite structure beams, columns, and shear wall components using profiled steel sheet composite floor slabs.

[0040] Figure 10 Example 1 is an assembly unit for prefabricated lattice-type steel-reinforced concrete composite structure beams, columns, and shear wall components using precast concrete composite floor slabs.

[0041] Reference numerals: 1. First frame section; 1-1. First lattice steel-reinforced concrete composite column; 1-2. First lattice steel-reinforced concrete composite beam; 1-3. First beam-column joint; 1-4. First column-column joint; 1-5. First beam-beam joint; 2. Shear wall section; 2-1. First lattice steel-reinforced concrete composite shear wall; 2-2. First wall-column joint; 2-3. First wall-beam joint; 3. First floor slab section; 3-1, steel-reinforced concrete composite floor slab; 3-2, profiled steel sheet composite floor slab; 3-3, precast concrete composite floor slab; 4. Second frame section; 4-1. Second lattice steel-reinforced concrete composite column; 4-2. Second lattice steel-reinforced concrete composite beam; 4-3. Second beam-column joint; 4-4. Second column-column joint; 4-5. Second beam-beam joint; 5. Core tube section; 5-1. Second lattice steel-reinforced concrete composite shear wall; 5-2. Second wall-column joint; 5-3. Second wall-beam joint; 6. The second floor slab section; 7. Completed layer; 8. Grouting and curing layer at joints; 9. Component assembly layer. Detailed Implementation

[0042] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0043] Example 1 This embodiment provides a prefabricated lattice-type steel-reinforced concrete composite structure, such as Figure 1 , 3 As shown in 4, 7, 8, 9, and 10, it includes: precast columns, precast shear walls, precast beams, and floor slabs; The precast columns, precast shear walls and precast beams all include a lattice frame and an outer concrete casing. The lattice frame is composed of longitudinal load-bearing steel members and transverse bracing. The main body of the lattice frame is embedded in the outer concrete casing, and the ends have protruding steel member segments. The precast columns, precast shear walls, and precast beams are connected on-site through the extended steel segments to form nodes.

[0044] Once the steel frame connection is completed, the node can bear the construction load, allowing the pouring and curing of the post-grouting material in the node area to be carried out simultaneously with the assembly of the upper structure.

[0045] In a specific implementation, the combined structure is a concrete frame-shear wall structure, including a first frame part 1 and a shear wall part 2; The first frame section 1 includes a first lattice steel-reinforced concrete composite column 1-1 and a first lattice steel-reinforced concrete composite beam 1-2, and the shear wall section 2 includes a first lattice steel-reinforced concrete composite shear wall 2-1, wherein the shear wall section 2 is distributed inside the first frame section 1. The precast column is the first lattice steel-reinforced concrete composite column 1-1, the precast shear wall is the shear wall section 2, and the precast beam is the first lattice steel-reinforced concrete composite beam 1-2.

[0046] In a specific embodiment, the first frame part 1 further includes a first beam-column node 1-3, a first column-column node 1-4, and a first beam-beam node 1-5; the shear wall part 2 further includes a first wall-column node 2-2 and a first wall-beam node 2-3; The first lattice-structured steel-reinforced concrete composite column 1-1 is connected to the first lattice-structured steel-reinforced concrete composite beam 1-2 at the first beam-column node 1-3; the first lattice-structured steel-reinforced concrete composite column 1-1 is connected to the first lattice-structured steel-reinforced concrete composite shear wall 2-1 at the first wall-column node 2-2; the first lattice-structured steel-reinforced concrete composite shear wall 2-1 is connected to the first lattice-structured steel-reinforced concrete composite beam 1-2 at the first wall-beam node 2-3; the first lattice-structured steel-reinforced concrete composite columns 1-1 are connected to each other at the first column-column node 1-4; the first lattice-structured steel-reinforced concrete composite beams 1-2 are connected to each other at the first beam-beam node 1-5. The first beam-column node 1-3 and the first wall beam node 2-3 are prefabricated in the factory and are prefabricated in the first lattice steel-concrete composite column 1-1 and the first lattice steel-concrete composite beam 1-2, transforming the beam-column connection and the primary and secondary beam connection into a beam-beam connection. The first column node 1-4, the first beam node 1-5, and the first wall column node 2-2 include steel frame connection sections formed by bolt connection, welding, or a combination of bolted and welded connections, and post-cast grout. The post-cast grout is ordinary concrete, fine stone concrete, grouting material, high-performance concrete, or ultra-high-performance concrete.

[0047] In a specific embodiment, the longitudinal load-bearing steel frame is a rolled steel section, a welded steel section, or a cold-formed steel section.

[0048] In a specific embodiment, the transverse bracing material is a bracing plate, bracing strip, or stirrup.

[0049] In a specific implementation, the floor slab is the first floor slab portion 3, which is a steel-reinforced concrete composite floor slab 3-1, a profiled steel sheet composite floor slab 3-2, or a precast concrete composite floor slab 3-3.

[0050] Example 2 This embodiment provides a prefabricated lattice-type steel-reinforced concrete composite structure, such as Figure 2 As shown, it includes: precast columns, precast shear walls, precast beams and floor slabs; The precast columns, precast shear walls and precast beams all include a lattice frame and an outer concrete casing. The lattice frame is composed of longitudinal load-bearing steel members and transverse bracing. The main body of the lattice frame is embedded in the outer concrete casing, and the ends have protruding steel member segments. The precast columns, precast shear walls, and precast beams are connected on-site through the extended steel segments to form nodes.

[0051] Once the steel frame connection is completed, the node can bear the construction load, allowing the pouring and curing of the post-grouting material in the node area to be carried out simultaneously with the assembly of the upper structure.

[0052] In a specific implementation, the combined structure is a concrete frame-core tube structure, including a second frame part 4 located around the perimeter and a core tube part 5 located in the middle. The second frame section 4 includes the second lattice steel-reinforced concrete composite column 4-1 and the second lattice steel-reinforced concrete composite beam 4-2, and the core tube section 5 includes the second lattice steel-reinforced concrete composite shear wall 5-1. The precast columns are second-lattice steel-reinforced concrete composite columns 4-1, the precast shear walls are the core tube section 5, and the precast beams are second-lattice steel-reinforced concrete composite beams 4-2.

[0053] In a specific embodiment, the second frame part 4 further includes a second beam-column node 4-3, a second column-column node 4-4, and a second beam-beam node 4-5; the core tube part 5 further includes a second wall-column node 5-2 and a second wall-beam node 5-3. The second lattice-structured steel-reinforced concrete composite column 4-1 is connected to the second lattice-structured steel-reinforced concrete composite beam 4-2 at the second beam-column node 4-3; the second lattice-structured steel-reinforced concrete composite column 4-1 is connected to the second lattice-structured steel-reinforced concrete composite shear wall 5-1 at the second wall-column node 5-2; the second lattice-structured steel-reinforced concrete composite shear wall 5-1 is connected to the second lattice-structured steel-reinforced concrete composite beam 4-2 at the second wall-beam node 5-3; the second lattice-structured steel-reinforced concrete composite columns 4-1 are connected to each other at the second column-column node 4-4; the second lattice-structured steel-reinforced concrete composite beams 4-2 are connected to each other at the second beam-beam node 4-5. The second beam-column node 4-3 and the second wall beam node 5-3 are prefabricated in the factory and are prefabricated in the second lattice steel-concrete composite column 4-1 and the second lattice steel-concrete composite beam 4-2, transforming the beam-column connection and the primary and secondary beam connection into a beam-beam connection. The second column node 4-4, the second beam node 4-5, and the second wall column node 5-2 include steel frame connection sections formed by bolt connection, welding, or a combination of bolted and welded connections, and post-cast grout. The post-cast grout is ordinary concrete, fine stone concrete, grouting material, high-performance concrete, or ultra-high-performance concrete.

[0054] In a specific embodiment, the longitudinal load-bearing steel frame is a rolled steel section, a welded steel section, or a cold-formed steel section.

[0055] In a specific embodiment, the transverse bracing material is a bracing plate, bracing strip, or stirrup.

[0056] In a specific implementation, the floor slab is the second floor slab portion 6, which is a composite floor slab, a precast reinforced concrete floor slab, or a steel truss floor slab.

[0057] Example 3 This embodiment provides a design method for a prefabricated lattice-type steel-reinforced concrete composite structure, including: S1. Construction Stage Design: Determine the construction load based on the number of assembly layers; analyze the stress on lattice steel-reinforced concrete composite components such as beams, columns, and walls during the construction stage; verify and design to determine the steel cross-sectional dimensions; verify the bearing capacity of splicing nodes and connection nodes during the construction stage; ensure that they are in an elastic state; S2. Overall stability verification during the service phase: internal force analysis and overall structural stability verification during the service phase, including critical load, structural stiffness verification, structural stiffness-to-weight ratio and overall overturning verification; S3. Seismic verification during the service phase: overall seismic performance analysis and seismic verification of the structure during the service phase, including elastic verification of the structure under frequent earthquakes, elastic-plastic deformation verification of the structure under rare earthquakes, and elastic-plastic deformation verification considering the P-Δ effect; S4. Component verification during service phase: Component section verification and design during service phase, including calculation of the flexural bearing capacity of the normal section, calculation of the shear and torsional bearing capacity of the inclined section, fire resistance limit verification, and bearing capacity calculation of each node for lattice steel-concrete composite columns, lattice steel-concrete composite beams, and lattice steel-concrete composite shear walls. S5. Serviceability Limit State Verification: Serviceability limit state verification during the service phase, including verification of crack width in the normal section and deflection of flexural members.

[0058] This embodiment also provides a construction method for a prefabricated lattice-type steel-reinforced concrete composite structure, such as... Figure 5 , 6 As shown, it includes the following steps: A1. The lower-level components are hoisted into place and connected to the foundation or the already installed components through the extended steel frame segments. The connection of the extended steel frame segments forms a steel frame connection segment, which can bear the construction load of the node grout pouring and curing layer 8 and the component assembly layer 9. A2. After the components are assembled, the component assembly layer 9 is transformed into the node grout pouring and curing layer 8. The pouring and curing of the node grout is carried out simultaneously with the assembly of the upper components. After the grout is poured and cured, the finished layer 7 is formed, and the node can withstand the load during the service stage.

[0059] A3. Repeat steps A1 and A2, constructing layer by layer upwards until the installation of the entire structural system is completed.

[0060] When the total structural height is low, the first lattice steel-reinforced concrete composite shear wall 2-1 and the second lattice steel-reinforced concrete composite shear wall 5-1 may not be required.

[0061] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0062] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A prefabricated lattice-type steel-reinforced concrete composite structure, which is a concrete frame-shear wall structure or a concrete frame-core tube structure, characterized in that, include: Precast columns, precast shear walls, precast beams and floor slabs; The precast columns, precast shear walls and precast beams all include a lattice frame and an outer concrete casing. The lattice frame is composed of longitudinal load-bearing steel members and transverse bracing. The main body of the lattice frame is embedded in the outer concrete casing, and the ends have protruding steel member segments. The precast columns, precast shear walls, and precast beams are connected on-site through the extended steel segments to form nodes.

2. The prefabricated lattice-type steel-reinforced concrete composite structure according to claim 1, characterized in that, The composite structure is a concrete frame-shear wall structure, including a first frame part (1) and a shear wall part (2). The first frame part (1) includes a first lattice steel-reinforced concrete composite column (1-1) and a first lattice steel-reinforced concrete composite beam (1-2), and the shear wall part (2) includes a first lattice steel-reinforced concrete composite shear wall (2-1). The shear wall part (2) is distributed inside the first frame part (1). The precast columns are first-lattice steel-reinforced concrete composite columns (1-1), the precast shear walls are shear wall sections (2), and the precast beams are first-lattice steel-reinforced concrete composite beams (1-2).

3. The prefabricated lattice-type steel-reinforced concrete composite structure according to claim 2, characterized in that, The first frame part (1) also includes a first beam-column node (1-3), a first column-column node (1-4), and a first beam-beam node (1-5); the shear wall part (2) also includes a first wall-column node (2-2) and a first wall-beam node (2-3); The first lattice-type steel-reinforced concrete composite column (1-1) and the first lattice-type steel-reinforced concrete composite beam (1-2) are connected at the first beam-column node (1-3); the first lattice-type steel-reinforced concrete composite column (1-1) and the first lattice-type steel-reinforced concrete composite shear wall (2-1) are connected at the first wall-column node (2-2); the first lattice-type steel-reinforced concrete composite shear wall (2-1) and the first lattice-type steel-reinforced concrete composite beam (1-2) are connected at the first wall-beam node (2-3); the first lattice-type steel-reinforced concrete composite columns (1-1) are connected to each other at the first column-column node (1-4); the first lattice-type steel-reinforced concrete composite beams (1-2) are connected to each other at the first beam-beam node (1-5). The first column-column node (1-4), the first beam-beam node (1-5), and the first wall-column node (2-2) include steel frame connection sections formed by bolt connection, welding, or a combination of bolted and welded connections, and post-cast grout. The post-cast grout is ordinary concrete, fine stone concrete, grouting material, high-performance concrete, or ultra-high-performance concrete.

4. The prefabricated lattice-type steel-reinforced concrete composite structure according to claim 1, characterized in that, The composite structure is a concrete frame-core tube structure, including a second frame part (4) located around the perimeter and a core tube part (5) located in the middle. The second frame section (4) includes the second lattice steel-reinforced concrete composite column (4-1) and the second lattice steel-reinforced concrete composite beam (4-2), and the core tube section (5) includes the second lattice steel-reinforced concrete composite shear wall (5-1). The precast columns are second-lattice steel-reinforced concrete composite columns (4-1), the precast shear walls are the core tube part (5), and the precast beams are second-lattice steel-reinforced concrete composite beams (4-2).

5. A prefabricated lattice-type steel-reinforced concrete composite structure according to claim 4, characterized in that, The second frame section (4) also includes a second beam-column node (4-3), a second column-column node (4-4), and a second beam-beam node (4-5); the core tube section (5) also includes a second wall-column node (5-2) and a second wall-beam node (5-3). The second lattice-type steel-reinforced concrete composite column (4-1) and the second lattice-type steel-reinforced concrete composite beam (4-2) are connected at the second beam-column node (4-3); the second lattice-type steel-reinforced concrete composite column (4-1) and the second lattice-type steel-reinforced concrete composite shear wall (5-1) are connected at the second wall-column node (5-2); the second lattice-type steel-reinforced concrete composite shear wall (5-1) and the second lattice-type steel-reinforced concrete composite beam (4-2) are connected at the second wall-beam node (5-3); the second lattice-type steel-reinforced concrete composite columns (4-1) are connected to each other at the second column-column node (4-4); the second lattice-type steel-reinforced concrete composite beams (4-2) are connected to each other at the second beam-beam node (4-5). The second column-column node (4-4), the second beam-beam node (4-5), and the second wall-column node (5-2) include steel frame connection sections formed by bolted connections, welding, or a combination of bolted and welded connections, and post-cast grout. The post-cast grout is ordinary concrete, fine stone concrete, grouting material, high-performance concrete, or ultra-high-performance concrete.

6. The prefabricated lattice-type steel-reinforced concrete composite structure according to claim 1, characterized in that, The longitudinal load-bearing steel frame is rolled steel, welded steel, or cold-formed steel.

7. The prefabricated lattice-type steel-reinforced concrete composite structure according to claim 1, characterized in that, The transverse bracing material is a bracing plate, bracing strip, or stirrup.

8. A prefabricated lattice-type steel-reinforced concrete composite structure according to claim 1, characterized in that, The floor slab is a composite floor slab, a precast reinforced concrete floor slab, or a steel truss floor slab.

9. A design method for a prefabricated lattice-type steel-reinforced concrete composite structure as described in any one of claims 1-8, characterized in that, include: S1. Construction Stage Design: Determine the construction load based on the number of assembly layers; analyze the stress of the lattice-type steel-reinforced concrete composite member during the construction stage; verify and design to determine the steel cross-sectional dimensions; verify the bearing capacity of splicing nodes and connection nodes during the construction stage; S2. Overall stability verification during the service phase: internal force analysis and overall structural stability verification during the service phase, including critical load, structural stiffness verification, structural stiffness-to-weight ratio and overall overturning verification; S3. Seismic verification during the service phase: overall seismic performance analysis and seismic verification of the structure during the service phase, including elastic verification of the structure under frequent earthquakes, elastic-plastic deformation verification of the structure under rare earthquakes, and elastic-plastic deformation verification considering the P-Δ effect; S4. Component verification during service phase: Component section verification and design during service phase, including calculation of the flexural bearing capacity of the normal section, calculation of the shear and torsional bearing capacity of the inclined section, fire resistance limit verification, and bearing capacity calculation of each node for lattice steel-concrete composite columns, lattice steel-concrete composite beams, and lattice steel-concrete composite shear walls. S5. Serviceability Limit State Verification: Serviceability limit state verification during the service phase, including verification of crack width in the normal section and deflection of flexural members.

10. A construction method for a prefabricated lattice-type steel-reinforced concrete composite structure as described in any one of claims 1-8, characterized in that, Includes the following steps: A1. The lower layer components are hoisted into place and connected to the foundation or the installed components through the extended steel frame segments. The connection of the extended steel frame segments forms a steel frame connection segment. The steel frame connection segment can bear the construction load of the node grout pouring and curing layer (8) and component assembly layer (9). A2. After the components are assembled, the component assembly layer (9) is transformed into the node grout pouring and curing layer (8). The pouring and curing of the node grout is carried out simultaneously with the assembly of the upper components. After the grout is poured and cured, the finished layer (7) is formed, and the node can withstand the load during the service stage. A3. Repeat steps A1 and A2, constructing layer by layer upwards until the installation of the entire structural system is completed.

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