Light dense rib wall body structure with tooth groove connection

Abstract

The invention discloses a light dense rib wall structure with tooth groove connection, and belongs to the technical field of building wall structures. In areas where natural disasters such as earthquakes frequently occur, improvement of the earthquake resistance of buildings is crucial. In order to overcome the defects of an existing dense rib composite wall body, the invention designs a novel structure filled with light building blocks, the dead weight of the wall body is obviously reduced through the special-shaped light composite building blocks, and the good heat preservation performance is kept. The structure comprises rib beams and rib columns, ceramsite concrete and steel bars are adopted, and the design concept of strong columns and weak beams is ensured. Through optimization design, the position of the plastic hinge is far away from the outer rib column, the shear strength of the joint is enhanced, and extension of the crack to the rib column is limited. The structure has the advantages that the construction process is simplified, the construction efficiency is improved, and the overall safety and durability of a building can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of building wall structure technology, and specifically to a lightweight ribbed wall structure with toothed joints. Background Technology

[0002] Traditional ribbed composite walls are prone to brittle failure at joints under seismic loading. Plastic hinges are located close to the outer ribs, and cracks extend along the rib beams towards the ribs, reducing the shear strength of the ribs. Furthermore, they are heavy, complex to construct, and not conducive to energy conservation or widespread adoption. Existing solutions, such as creating recessed grooves in the fixed frame of the blocks and filling them with material to enhance connections, or using porous silicate blocks and filling the joints with mortar and fiber to improve seismic performance, still suffer from problems such as unreasonable placement of plastic hinges, thermal bridging, and demanding construction requirements. Therefore, there is an urgent need for a new lightweight ribbed wall structure that balances seismic ductility, integrity, weight reduction, and industrialized construction.

[0003] To address the aforementioned issues, scholars have proposed various lightweight ribbed wall structures in recent years, including serrated block walls, oblique rib grids, and diagonal tie rods within the blocks, significantly improving the seismic performance of the walls. Numerous related patents have explored this area. For example, patent CN120100136A discloses a lightweight ribbed composite wall panel where concave grooves are evenly distributed on the fixed frame of the blocks at the junction of the blocks and the concrete main body, filled with expanding adhesive or concrete mortar to enhance the connection strength between the fixed frame and the concrete main body. However, the reinforcement arrangement at the joints between the outer ribs and beams still uses the traditional method. The plastic hinge area formed after the wall is subjected to lateral forces is close to the outer ribs, which may affect the performance of the outer ribs and limit the full utilization of the wall's ductility. Furthermore, the fixed frame is prone to forming cold bridges, affecting the wall's thermal insulation performance. Patent CN108035484B proposes a seismic-resistant ribbed composite wall panel. The blocks have a serrated contact with the ribs and columns. The blocks are porous silicate blocks made from siliceous and calcareous materials, doped with aluminum powder, and have a hollow structure. Cement mortar is used to fill the joints between adjacent blocks, and fibers are incorporated into the main structure. This wall panel significantly improves overall seismic resistance and energy dissipation performance, enhancing safety under extreme conditions. However, the use of small blocks and the variety of block shapes within the same rib grid pose challenges to construction, requiring high precision in manufacturing and matching with construction requirements.

[0004] Overall, existing lightweight ribbed wall structures still have significant shortcomings in terms of energy dissipation capacity and seismic defense. Most walls only consider block infill and do not address beam-column joints, which greatly increases the complexity of wall construction and hinders the promotion of fully prefabricated buildings.

[0005] Foam-coated straw-based ceramsite concrete blocks offer advantages such as ease of manufacturing and excellent thermal insulation. They are commonly used as infill blocks in ribbed composite walls, effectively reducing the wall's weight and improving its insulation performance. The block manufacturing process involves first cutting the foam into suitable shapes, then pouring straw-based ceramsite concrete, facilitating the creation of irregularly shaped structures. Integrating grooved lightweight blocks with lightweight ribbed walls in a coordinated design not only aids in constructing a multi-layered earthquake-resistant defense strategy but also enhances structural ductility. Addressing the shortcomings of existing structures, this invention provides a novel infill lightweight block structure that achieves grooved connections at beam-column joints, significantly reducing the wall's weight while simultaneously improving its thermal insulation performance.

[0006] Therefore, there is an urgent need to design a new structural form for lightweight ribbed walls to achieve "strong columns and weak beams" in ribbed walls, which has become a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0007] To address the aforementioned issues, a lightweight ribbed wall structure is proposed, consisting of "irregularly shaped lightweight composite blocks with interlocking toothed joints + variable cross-section guiding plastic hinges at beam ends + joint reinforcement system." This structure aims to achieve strong column-weak beam and strong shear-weak bending properties, thereby improving interface shear resistance and overall integrity while simplifying construction.

[0008] Irregularly shaped lightweight composite blocks are filled in the frame structure composed of rib beams and rib columns. The rib beams and blocks are interlocked through pre-set toothed grooves, which enhances friction and mechanical interlocking, delays the appearance of cracks around the wall, and when the rib beams crack, the toothed groove concrete protrusions divide the cracks, making it difficult to penetrate the interface.

[0009] The beam ends of the rib beams near the rib columns adopt a variable cross-section structure to improve the bending load at the beam ends and guide the plastic hinges to the beam ends away from the rib columns, thereby reducing the risk of brittle shear at the joints.

[0010] The rib beams and rib columns are made of lightweight aggregate concrete with longitudinal main bars and stirrups, and double-leg stirrups are arranged at the section reduction of the rib beams; the longitudinal bars of the rib beams are at least four and extend into the outer rib column to 3 / 4 of its section height and bend or hook at the tail, thus forming a joint reinforcement system, which works in conjunction with the variable cross section and toothed connection to improve load-bearing capacity and ductility.

[0011] The present invention has the following effects:

[0012] By using a variable cross-section and joint reinforcement system, the plastic hinge is moved away from the outer rib column, avoiding brittle shear failure at the joint and satisfying the seismic design principles of "strong column-weak beam, strong shear-weak bending, and strong joint-weak member".

[0013] The interlocking connection significantly enhances the synergistic effect and interfacial shear resistance between the rib beam and the infill block, improving overall integrity and ductility;

[0014] The use of lightweight composite blocks and ceramsite concrete reduces the self-weight of the wall and optimizes the thermal insulation effect, while simplifying the construction process and improving efficiency. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure of a lightweight ribbed wall;

[0016] Figure 2 Section 1-1 shows the reinforcement in the beam-column joint area and the variable cross-section at the beam end;

[0017] Figure 3 For section 2-2, the arrangement of the ribbed beam reinforcement and the double-leg stirrups at the section reduction point are shown in the diagram.

[0018] Figure 4 The structural diagram of the irregularly shaped lightweight composite block (with the geometry of the trapezoidal protrusions and the thickness of the outer shell marked);

[0019] The codes in the attached diagram are: 1-Outer rib beam; 2-Irregularly shaped lightweight composite block; 21-EPS insulation core material; 22-Lightweight aggregate concrete shell; 3-Inner rib beam; 31-Longitudinal reinforcement of rib beam; 311-First stress-bearing section of longitudinal reinforcement of rib beam at bend; 312-Horizontal section of longitudinal reinforcement of rib beam at bend; 313-Second stress-bearing section of longitudinal reinforcement of rib beam at bend; 32-Rib beam stirrup; 33-Bend portion of upper longitudinal reinforcement of rib beam extending into column; 34-Bend portion of lower longitudinal reinforcement of rib beam extending into column; 4-Outer rib column; 41-Longitudinal reinforcement of outer rib column; 42-Stirrup of outer rib column; 43-Stirrup of outer rib column located in the middle of rib beam; 5-Inner rib column; 51-Stirrup of inner rib column; 52-Longitudinal reinforcement of inner rib column; α-Inclination angle of trapezoidal protrusion. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] like Figures 1 to 4 As shown, the present invention discloses a lightweight ribbed wall structure with toothed joints, the main body of which includes a frame structure and thermal insulation blocks.

[0022] Specifically, the frame structure consists of rib beams 1 and 3 and rib columns 4 and 5, which are the main load-bearing components of the wall; the materials of rib beams 1 and 3 and rib columns 4 and 5 are all ceramsite reinforced concrete.

[0023] Specifically, the insulation structure is an irregularly shaped lightweight composite block 2, which is filled in the frame structure and has the function of heat insulation; the irregularly shaped lightweight composite block 2 is composed of EPS insulation material 21 and straw ceramsite concrete shell 22, which is prefabricated in the factory and poured together with the wall.

[0024] Preferably, the cross-sectional shape of the inner rib beam 3 is rectangular, with a height of 100mm, and the cross-sectional height changes to 50mm at a distance of 75mm from the beam end.

[0025] Preferably, the rib beam needs to be equipped with at least four longitudinal bars 31, which extend into the outer rib column to a depth of 3 / 4 of the cross-sectional height of the outer rib column, and then bend upward or downward. The length of the bent part 33, 34 is 145mm, and the angle of the hook is 135°.

[0026] Preferably, the EPS insulation material 21 is cut into 4 trapezoidal protrusions, and wrapped with straw ceramsite concrete evenly, with a thickness of 10mm.

[0027] Preferably, the trapezoidal inclination angle α is 135°. When a crack appears at the end of the rib beam, the crack will extend to the upper base of the trapezoid on the other side, so that the plastic hinge area is away from the rib column.

[0028] Preferably, double-limb stirrups 32 are arranged at the section reduction of the inner rib beam 3 to increase the shear strength of the plastic hinge region.

[0029] Preferably, the stirrups of the outer rib column are spaced at 120mm intervals, and the stirrups are densified to 50mm within a 200mm range of the node area.

[0030] Preferably, the stirrups 43 of the outer rib column located in the middle of the inner rib beam 3 extend 50mm into the beam end.

[0031] Preferably, the stirrups of the inner rib column are spaced 100mm apart, and are not reinforced at the joints.

[0032] Preferably, the vertical distance between the horizontal section 312 of the rib longitudinal reinforcement bend and the first stress section 311 or the second stress section 313 of the rib longitudinal reinforcement bend is taken as 2 / 5 of the original distance between the top longitudinal reinforcement and the bottom longitudinal reinforcement.

[0033] refer to Figures 1 to 4 The technical solution of the construction method of the present invention includes the following steps:

[0034] Step 1: Create irregularly shaped lightweight composite blocks using wooden block templates. Cut EPS insulation material into the specified shape, place it in the template, and use a limiter to determine the position of the insulation material; pour ceramsite concrete, and remove the template after curing.

[0035] Step Two: Constructing a lightweight ribbed wall filled with irregularly shaped lightweight composite blocks. First, set up the formwork around the wall and tie the reinforcing steel bars. Place the irregularly shaped lightweight composite blocks in the designated positions, install the embedded parts, and then pour the expanded clay concrete. After the concrete has cured, it can be transported to the site for installation.

Claims

1. A lightweight ribbed wall structure with toothed connections, comprising a frame structure composed of rib beams and rib columns, and irregularly shaped lightweight composite blocks filled in the frame structure, characterized in that: The rib beam and the irregularly shaped lightweight composite block are connected by a toothed interlocking connection to enhance interfacial friction and mechanical interlocking force. When cracks appear in the rib beam, the toothed concrete protrusions divide the cracks, making it difficult for them to penetrate the entire interface. The beam end of the rib beam near the rib column has a variable cross-section structure, with the beam end section height being greater than the section height of other parts of the beam body, so as to guide the plastic hinge area to the beam end position away from the rib column. The rib beam and the rib column are cast from ceramsite concrete with longitudinal main bars and stirrups. The rib beam is equipped with at least four longitudinal bars, and the depth of the longitudinal bars extending into the outer rib column is 3 / 4 of the cross-sectional height of the outer rib column, and a bend or hook is set at the tail after extension. Double-leg stirrups are set at the section reduction of the rib beam to improve the shear strength of the area.

2. The wall structure according to claim 1, wherein, The spacing of the stirrups in the outer rib column is 120mm, and it is increased to 50mm within a 200mm range in the node area. The stirrups in the outer rib column located in the middle of the rib beam extend 50mm into the beam end.

3. The wall structure according to claim 1, wherein, The spacing of the stirrups in the inner ribbed column is 100mm, and no additional stirrups are added at the joints.

4. The wall structure according to claim 1, wherein, The inner rib beam has a rectangular cross-section with a beam height of 100mm, and the cross-section height changes to 50mm at a distance of 75mm from the beam end.

5. The wall structure according to claim 1, wherein, The irregularly shaped lightweight composite block is composed of EPS insulation material and straw ceramsite concrete shell. The EPS insulation material is cut into 4 trapezoidal protrusions and the shell thickness is 10mm.

6. The wall structure according to claim 5, wherein, The inclination angle α of the trapezoidal protrusion is 135°.

7. The wall structure according to claim 1, wherein, The longitudinal steel bars of the rib beam extend into the outer rib column and then bend upward or downward, with a bending length of 145mm and a hook angle of 135°.

8. The wall structure according to claim 1, wherein, The vertical distance between the horizontal section of the longitudinal reinforcement bend and its first or second stressed section is 2 / 5 of the original distance between the top longitudinal reinforcement and the bottom longitudinal reinforcement.

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