Steel-concrete composite structure

Abstract

The invention relates to a steel-concrete composite structure, which belongs to the technical field of civil engineering, and comprises a middle chamber provided with a core cavity for pouring concrete; the multiple side chambers are arranged, and the multiple side chambers are arranged around the middle chamber in a surrounding mode; the transverse partition plates are arranged between the middle chamber and the side chambers, and the multiple layers of transverse partition plates are evenly distributed in the height direction of the middle chamber. The middle chamber serves as a center concrete cavity and is specially used for concrete filling of a core stress area. The multiple side chambers surrounding the middle chamber form an annular buffer zone, the heat influence of the external environment on concrete in the middle chamber is effectively improved, and the concrete tensile stress and the cracking risk caused by the temperature difference between the internal concrete and the steel wall plate are reduced.

Description

Technical Field

[0001] This application relates to the field of civil engineering technology, and in particular to steel-concrete composite structures. Background Technology

[0002] Steel boasts outstanding advantages such as high strength and good ductility, with particularly excellent tensile and shear properties; however, it also has drawbacks such as high material cost, susceptibility to corrosion, and instability under pressure. Concrete structures offer advantages such as strong compressive strength, good durability, and superior economy, but also suffer from disadvantages such as low tensile strength, susceptibility to cracking, poor ductility, and high self-weight. While each material has its own strengths, both occupy irreplaceable positions in the field of civil engineering due to their core advantages and have experienced rapid development with advancements in materials technology. Steel-concrete composite structures, as a combination of the two materials, inherit the lightweight, high strength, and good ductility of steel while incorporating the compressive strength and economic advantages of concrete, effectively compensating for the performance shortcomings of either material. Therefore, they have seen significant development in high-rise buildings, long-span bridge structures, and other fields, becoming one of the important technological directions in modern civil engineering.

[0003] Concrete-core steel box structures, as a novel composite structure, share loads through the interaction between the outer steel box and the core concrete. The core concrete provides compressive strength, while the steel box provides flexural strength, fully utilizing the material properties. A common steel box-core concrete structure involves filling the outer steel box with concrete, using shear studs or perforated plates on the outer wall panels to achieve synergistic load-bearing. However, this structural form, with the concrete in direct contact with the outer wall panels, presents several challenges. First, under sunlight, a significant temperature gradient effect exists between the outer steel wall panels and the inner concrete, with a temperature difference exceeding 30°C. This can lead to substantial tensile stress cracking in the concrete, with the tensile stress exceeding 10 MPa under the single effect of the temperature gradient. Second, to control deformation of the steel wall panels during concrete pouring, longitudinal and transverse stiffening ribs or diaphragms are often installed on the inner side of the steel wall panels. However, these transverse stiffening ribs or diaphragms may obstruct the concrete pouring path, making localized concrete vibration difficult and potentially causing problems such as incomplete compaction and honeycombing, ultimately reducing the overall structural integrity and load-bearing performance. Summary of the Invention

[0004] This application provides a steel-concrete composite structure to address the problem in related technologies where steel-core concrete structures are prone to cracking due to excessive tensile stress caused by temperature gradient effects under sunlight, while transverse stiffening ribs or diaphragms installed to control steel wall panel deformation can obstruct the concrete pouring path, leading to difficulties in vibration, incomplete pouring, and honeycomb defects. These two problems together threaten structural safety.

[0005] A steel-concrete composite structure is provided, comprising: a central chamber having a core cavity for pouring concrete; multiple side chambers surrounding the central chamber; and a diaphragm disposed between the central chamber and the side chambers, wherein the diaphragm has multiple layers evenly distributed along the height direction of the central chamber.

[0006] By adopting the above technical solution: the side chamber serves as a cavity area surrounding the central chamber, forming a continuous air buffer layer that effectively blocks the conduction of external solar heat to the core concrete. The transverse diaphragms are evenly distributed in multiple layers along the height of the central chamber, providing the required formwork rigidity for the core concrete pouring.

[0007] In some embodiments, the central chamber and the plurality of side chambers are formed by a plurality of longitudinal wall panels and a plurality of transverse wall panels interleaved with each other, and a plurality of side chambers are formed along the longitudinal sides of the central chamber, and at most one side chamber is formed along the transverse sides of the central chamber.

[0008] By adopting the above technical solution, the central chamber and multiple side chambers are composed of longitudinal and transverse wall panels that are interleaved to form a rigid frame system, which plays a key role in heat insulation and construction path optimization, and achieves multi-effect synergy.

[0009] In some embodiments, the side chambers on both sides of the central chamber are arranged to protrude from the side chambers on both sides of the central chamber in the longitudinal direction.

[0010] By adopting the above technical solution, the transverse side chambers of the central chamber protrude beyond the longitudinal side chambers, forming an outward-convex heat insulation barrier that effectively blocks solar heat radiation, reduces the temperature difference between the inside and outside, and prevents concrete temperature cracking. At the same time, the pouring flow path is optimized, the concrete density is improved, and the structural construction quality, durability, and wind and earthquake resistance are significantly improved.

[0011] In some embodiments, the diaphragm has openings, and the openings on the diaphragm located transversely to the central chamber are larger than the openings on the diaphragm located longitudinally to the central chamber.

[0012] By adopting the above technical solution, the diaphragm ensures a uniform distribution of rigidity between the central chamber and the side chambers. The design of the openings also saves costs, and the openings on the transverse diaphragm of the central chamber can be used for later elevator shaft installation, worker access, and mechanical hoisting.

[0013] In some embodiments, horizontal stiffening ribs are provided between adjacent transverse partitions, and the horizontal stiffening ribs are fixed to the outer steel wall panel of the central chamber.

[0014] By adopting the above technical solution, horizontal stiffening ribs are fixed to the outer wall of the middle chamber, ensuring that the stiffness of the steel wall panel meets the specifications under the lateral pressure of concrete.

[0015] In some embodiments, the horizontal stiffening ribs are configured as plate ribs.

[0016] By adopting the above technical solution, the deformation of the steel wall panel under lateral load is reduced by setting horizontal stiffening ribs on the steel wall panel, the contact surface between the steel wall panel and the concrete is increased, the integrity of the concrete and the steel wall panel is improved, the load transfer efficiency is significantly improved, and the plate ribs are pre-cut and welded in the factory and then directly transported to the site for installation, completely avoiding the cumbersome process of traditional angle steel on-site cutting and correction.

[0017] In some embodiments, the horizontal stiffening rib is configured as a T-rib.

[0018] By adopting the above technical solution, the T-shaped section design increases the bending stiffness of the horizontal stiffening ribs compared to the plate ribs, reduces the local stress concentration factor of the steel wall plate, and reduces the possibility of microcrack initiation.

[0019] In some embodiments, the inner wall of the central chamber is provided with a plurality of first vertical stiffening ribs.

[0020] By adopting the above technical solution, the first vertical stiffening rib is set in the inner wall of the middle chamber to precisely control the deformation of the steel wall panel, eliminate the blockage of the pouring path, significantly improve the construction quality and structural durability, and provide key guarantee for the efficient and coordinated stress of the core concrete.

[0021] In some embodiments, shear studs are provided on the inner wall of the central chamber.

[0022] By adopting the above technical solution, shear studs are installed on the inner wall of the middle room to strengthen the shear force transfer at the steel-concrete interface and the overall structural integrity, thereby improving the load-bearing capacity.

[0023] In some embodiments, the inner wall of the side chamber is provided with a plurality of second vertical stiffening ribs.

[0024] By adopting the above technical solution: setting a second vertical stiffening rib on the inner wall of the side chamber, the deformation of the steel wall panel of the side chamber is precisely controlled, the pouring blockage is eliminated, the concrete density is improved, and the overall rigidity and durability are enhanced in conjunction with the central chamber structure, significantly improving the construction quality and load transfer efficiency.

[0025] The beneficial effects of the technical solution provided in this application include: This application provides a steel-concrete composite structure, where the central chamber serves as the core concrete cavity, specifically for filling the core load-bearing area with concrete; multiple side chambers surrounding the central chamber form a "ring-shaped buffer zone," isolating the thermal impact of the external steel wall panels within the side chamber area, rather than directly affecting the central chamber concrete; and multiple layers of transverse diaphragms are evenly distributed along the height of the central chamber, serving as a separation support between the central and side chambers, rather than blocking the pouring path. This multi-layered, evenly distributed design ensures the overall structural rigidity, while reserving concrete flow channels at reasonable intervals to avoid physical obstruction. In this solution, the side chambers surrounding the central chamber form a "thermal insulation ring," ensuring that the external steel wall panels only cover the outer side of the side chambers, leaving the central chamber concrete entirely within the thermal buffer zone of the side chambers. The transverse diaphragms are only located at the junction of the central and side chambers, and are evenly distributed in multiple layers along the height direction, ensuring the overall structural rigidity while reserving concrete flow channels at reasonable intervals to avoid physical obstruction. The overall structure exhibits a higher ultimate bearing capacity. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of this application; Figure 2 This is a cross-sectional schematic diagram provided for an embodiment of this application.

[0028] In the diagram: 1. Central chamber; 10. Horizontal stiffening rib; 11. First vertical stiffening rib; 12. Shear stud; 2. Core chamber; 3. Side chamber; 30. Second vertical stiffening rib; 4. Transverse diaphragm; 5. Longitudinal wall panel; 6. Transverse wall panel; 7. Opening. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] This application provides a steel-concrete composite structure that can solve the problem in related technologies where steel-core concrete structures are prone to cracking due to excessive tensile stress in the concrete under sunlight caused by temperature gradient effects. At the same time, the transverse stiffening ribs or diaphragms set to control the deformation of the steel wall panels can block the concrete pouring path, causing difficulties in vibration, incomplete pouring, and honeycomb defects. These two problems together threaten the structural safety.

[0031] Reference Figure 1-2 A steel-concrete composite structure includes a central chamber 1, side chambers 3, and transverse diaphragms 4. The central chamber 1 has a core cavity 2 for pouring concrete. Multiple side chambers 3 surround the central chamber 1. Specifically, the central chamber 1 and the side chambers 3 together form a single-box nine-chamber cross-section consisting of eight side chambers 3 and one central chamber 1. Both the central chamber 1 and the side chambers 3 are made of steel wall panels. Transverse diaphragms 4 are placed between the central chamber 1 and the side chambers 3, and multiple layers of transverse diaphragms 4 are evenly distributed along the height direction of the central chamber 1. The poured concrete structure is reinforced concrete, in which the reinforcing bars are mixed horizontally and vertically in the concrete. Horizontal reinforcing bars pierce through the inner wall of the central chamber 1 to form shear keys, and vertical reinforcing bars intersect with horizontal reinforcing bars to form a reinforcing mesh, increasing the overall structural integrity.

[0032] Concrete core, as an innovative composite structure, achieves efficient load transfer through the synergistic effect of the outer steel box and the concrete core. Its core advantage lies in fully utilizing the compressive strength of concrete and the flexural strength of the steel box. However, in engineering practice, traditional steel box-concrete core structures suffer from several problems: First, the concrete is in direct contact with the outer steel wall panels, creating a significant temperature gradient effect under sunlight, with the internal and external temperature difference reaching over 30°C. This leads to excessive tensile stress within the concrete, causing structural cracking. Second, to control the deformation of the steel wall panels during pouring, longitudinal and transverse stiffening ribs or diaphragms 4 are often installed on the inner side. These components not only obstruct the concrete pouring path but also cause localized vibration difficulties, incomplete compaction, and honeycombing, ultimately weakening the overall structural performance. To address these bottlenecks, this application combines the central chamber 1 with multiple side chambers 3 and evenly distributes multiple layers of diaphragms 4 along the height between the central chamber 1 and the side chambers 3. Through optimized structural layout, the temperature gradient and pouring challenges are systematically solved, significantly improving the structural performance and construction feasibility.

[0033] Specifically: Side chamber 3, as a cavity surrounding the central chamber 1, forms a continuous air buffer layer, effectively blocking the conduction of external solar heat to the core concrete. When the steel wall panels of side chamber 3 are heated, the air convection and thermal resistance within side chamber 3 significantly reduce the temperature difference between the concrete and the steel wall panels in the central chamber 1, thereby reducing the tensile stress in the concrete to a safe threshold and fundamentally avoiding the risk of temperature cracking. Secondly, the diaphragms 4 are evenly distributed in multiple layers along the height of the central chamber 1, eliminating the problem of the diaphragms 4 blocking the path. During the pouring process, the concrete is uniformly filled, and the multiple layers of diaphragms 4 provide segmented vibration space, allowing the vibrator to penetrate into each area, ensuring the density of the concrete and significantly reducing defects such as honeycomb and voids. Finally, from a structural mechanics perspective, the central chamber 1 serves as the core compression zone, while side chamber 3 and the steel box work together to bear the bending moment. The multiple layers of diaphragms 4 enhance the stability in the height direction, making the load distribution more uniform and avoiding stress concentration.

[0034] In this application, to facilitate the forming of the central chamber 1 and the side chambers 3, the central chamber 1 and the multiple side chambers 3 are designed to be composed of multiple longitudinal wall panels 5 and multiple transverse wall panels 6 arranged in an alternating pattern. Multiple side chambers 3 are formed along the longitudinal sides of the central chamber 1, and at most one side chamber 3 is formed along the transverse sides of the central chamber 1. Furthermore, the side chambers 3 on the transverse sides of the central chamber 1 protrude beyond the side chambers 3 on the longitudinal sides of the central chamber 1. The steel wall panels of both the central chamber 1 and the side chambers 3 are preferably made of Q370qE steel; the thickness of both the longitudinal and transverse inner wall panels is 24mm, and the longitudinal and transverse dimensions between them are 14m and 10m respectively. The longitudinal and transverse dimensions of the core concrete are 5m and 3m respectively, and C60 concrete is used.

[0035] The central chamber 1 and multiple side chambers 3 are enclosed by alternating longitudinal wall panels 5 and transverse wall panels 6, forming a rigid frame system. Multiple side chambers 3 are arranged along both longitudinal sides of the central chamber 1, preferably three side chambers 3 on each side, for a total of six, providing uniform longitudinal support. At most one side chamber 3 is arranged along both transverse sides of the central chamber 1, for a total of two. The side chambers 3 on the transverse sides of the central chamber 1 protrude beyond the side chambers 3 on the longitudinal sides. This design plays a crucial role in optimizing thermal insulation and construction paths, achieving multi-effect synergy. The multiple longitudinal side chambers 3 provide uniform bending support, while the transversely protruding side chambers 3 enhance wind and earthquake resistance.

[0036] In this application, the transverse partition 4 is also provided with openings 7, and the openings 7 on the transverse partition 4 located in the middle chamber 1 are larger than the openings 7 on the longitudinal partition 4 located in the middle chamber 1. The spacing of the transverse partitions 4 is preferably 3000mm to ensure uniform stiffness distribution between the middle chamber 1 and the side chambers 3. The design of the openings 7 also saves costs, and the openings 7 on the transverse partition 4 of the middle chamber 1 can be used for later elevator shaft installation or worker access.

[0037] In this application, horizontal stiffening ribs 10 are also provided between adjacent transverse diaphragms 4, and the horizontal stiffening ribs 10 are fixed to the outer wall of the central chamber 1. The number of horizontal stiffening ribs 10 is designed according to the formwork stiffness requirements for pouring the core concrete. The horizontal stiffening ribs 10 are fixed to the outer wall of the central chamber 1, and the number of horizontal stiffening ribs 10 is dynamically designed according to the formwork stiffness requirements: for example, under the condition of a diaphragm spacing of 3000mm, a horizontal stiffening rib 10 is set every 2-3 meters to ensure that the deflection of the steel wall panel under the lateral pressure of concrete meets the specification requirements.

[0038] In some feasible embodiments, the horizontal stiffeners 10 are designed as plate stiffeners, reducing the deformation of the steel wall panel and minimizing microcracks caused by sudden stress changes. More importantly, the smooth transition design of the plate stiffeners eliminates the "sharp-angle effect" of angle steel stiffeners, improving the interfacial bond strength between the concrete and the steel wall panel and significantly enhancing load transfer efficiency. Furthermore, the plate stiffeners are pre-cut and welded in the factory and then directly transported to the site for installation, completely avoiding the cumbersome process of on-site cutting and straightening of traditional angle steel. During installation, the plate stiffeners can be fixed by welding to one side of the outer wall, requiring no additional support or temporary reinforcement.

[0039] In some feasible embodiments, the horizontal stiffener 10 is set as a T-rib. The T-shaped cross-section design increases the bending stiffness of the horizontal stiffener 10 compared to the plate rib, reduces the local stress concentration factor of the steel wall plate, and reduces the possibility of microcrack initiation.

[0040] In this application, the inner wall of the central chamber 1 is provided with multiple first vertical stiffening ribs 11, and the first vertical stiffening ribs 11 are provided with perforations. The horizontal steel bars in the reinforced concrete structure pass through the perforations on the first vertical stiffening ribs 11 to form shear keys. The vertical steel bars and horizontal steel bars intersect to form a steel mesh, which increases the overall structural integrity. The inner wall of the side chamber 3 is provided with multiple second vertical stiffening ribs 30. The second vertical stiffening ribs 30 are plate ribs with a size of 16mm×190mm and a spacing of 500mm. Through the refined structural layout and parameter design, the contact area between the stiffening ribs and the wall panels is greatly reduced, while ensuring that the net gap between the stiffening ribs is much higher than the minimum channel width required for concrete flow. This avoids the accumulation and segregation of concrete at the stiffening ribs, lays the foundation for uniform pouring, and eliminates the local vibration blind zone caused by deformation.

[0041] In this application, shear studs 12 are also provided on the inner wall of the central chamber 1. The shear studs 12 are provided on the inner wall of the central chamber 1 to ensure that the shear force transmission efficiency is not affected by casting defects.

[0042] The implementation principle of this application embodiment is as follows: In terms of temperature control, the layout of the middle chamber 1 and the side chamber 3 forms a continuous air insulation layer, which extends the path of external solar heat conduction. At the same time, the enlarged design of the transverse opening 7 and the synergy of the protruding side chamber 3 further suppress heat conduction, reduce the tensile stress of the concrete, and eliminate the risk of temperature cracking. Secondly, in terms of casting quality, the vertical stiffening ribs and the transverse opening 7 form a clear gap flow channel, which reduces the flow resistance of concrete and improves the efficiency of air bubble removal. The external horizontal stiffening ribs 10 avoid the inner stiffening ribs from blocking the path, ensuring unobstructed casting channels, and working with the opening 7 to achieve "unobstructed flow", thus reducing the incidence of honeycomb defects. In terms of structural reinforcement, the transverse protrusion of the middle chamber 1 into the side chamber 3 enhances wind and earthquake resistance. The horizontal stiffening ribs 10 and shear studs 12 are arranged to form an "internal and external double-layer stiffness system": the horizontal stiffening ribs 10 control the deformation of the steel wall panel, and the shear studs 12 strengthen the shear force transmission at the interface. Finally, the spacing of the diaphragm 4 and the transverse opening 7 form a "pre-embedded channel", which not only optimizes the pouring path, but also reserves standard holes for the later installation of the elevator shaft.

[0043] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0044] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A steel-concrete composite structure, characterized in that, It includes: The central chamber (1) is equipped with a core chamber (2) for pouring concrete. Side chambers (3) are provided in multiples, and the multiple side chambers (3) surround the central chamber (1); A diaphragm (4) is disposed between the central chamber (1) and the side chamber (3), and the diaphragm (4) is evenly distributed in multiple layers along the height direction of the central chamber (1).

2. The steel-concrete composite structure as described in claim 1, characterized in that: The central chamber (1) and multiple side chambers (3) are formed by multiple longitudinal wall panels (5) and multiple transverse wall panels (6) interleaved and enclosed each other, and multiple side chambers (3) are formed along the longitudinal sides of the central chamber (1), and at most one side chamber (3) is formed along the transverse sides of the central chamber (1).

3. The steel-concrete composite structure as described in claim 2, characterized in that: The side chambers (3) on both sides of the central chamber (1) are set to protrude from the side chambers (3) on both sides of the central chamber (1) in the longitudinal direction.

4. A steel-concrete composite structure as described in claim 3, characterized in that: The diaphragm (4) is provided with an opening (7), and the opening (7) on the diaphragm (4) located in the transverse direction of the middle chamber (1) is larger than the opening (7) on the diaphragm (4) located in the longitudinal direction of the middle chamber (1).

5. A steel-concrete composite structure as described in claim 1, characterized in that: A horizontal stiffening rib (10) is provided between adjacent transverse partitions (4), and the horizontal stiffening rib (10) is fixed to the outer wall of the middle chamber (1).

6. A steel-concrete composite structure as described in claim 5, characterized in that: The horizontal stiffening rib (10) is configured as a plate rib.

7. A steel-concrete composite structure as described in claim 5, characterized in that: The horizontal stiffening rib (10) is configured as a T-rib.

8. A steel-concrete composite structure as described in claim 1, characterized in that: The inner wall of the central chamber (1) is provided with a plurality of first vertical stiffening ribs (11).

9. A steel-concrete composite structure as described in claim 1, characterized in that: Shear studs (12) are provided on the inner wall of the middle chamber (1).

10. A steel-concrete composite structure as described in claim 1, characterized in that: The inner wall of the side chamber (3) is provided with a plurality of second vertical stiffening ribs (30).

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