Low-damage flexible connection system for infill wall panel and construction method thereof

Abstract

The present application relates to a kind of low-damage infill wallboard flexible connection system and its construction method, low-damage infill wallboard flexible connection system includes prestressed precast concrete beam (1), prestressed precast concrete column (2), foundation (3), prefabricated infill wallboard (4);The prestressed precast concrete beam (1), prestressed precast concrete column (2) and foundation (3) form frame structure, the prefabricated infill wallboard (4) is waist type structure, prefabricated infill wallboard (4) is set in frame structure and is connected with frame structure by connecting piece (5). Compared with prior art, the present application can reduce the damage degree of block infill wall under the deformation of overall structure, improve the energy consumption level of structure, improve the anti-seismic ability, for a kind of more shock-resisting toughness infill wall.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a low-damage infill wall panel flexible connection system and its construction method. Background Technology

[0002] Despite over two decades of research, precast prestressed self-centering structural systems have yet to see large-scale engineering applications. Besides the need for further verification of their collapse resistance under extreme earthquakes, another limiting factor in practical engineering applications is the damage control of non-structural components within the system. Compared to traditional cast-in-place beam-column joint structures, precast prestressed self-centering structural systems exhibit more significant deformation during earthquakes. Under such horizontal inter-story deformation, non-structural components, especially infill walls, face more severe damage. Although the main structure can achieve self-centering, severe damage to non-structural components such as infill walls hinders the restoration of the structure's normal functional use.

[0003] The concept of low-damage design emerged as early as the 1980s, with seismic isolation technology being a typical example, widely applied in the engineering field since then. In 2003, Yang Dixiong and other scholars proposed that low-damage design embodies the concept of "disaster-sharing" seismic-resistant structural design, that is, using pre-designed seismic isolation foundation supports to share the seismic resistance of the structure, allowing the superstructure to remain essentially elastic during major earthquakes. New Zealand experienced the Canterbury earthquakes in 2010 and 2011, after which "low-damage design" gained significant attention in the country's academic and engineering communities. In 2011, Buchanan and other scholars proposed a new seismic fortification target based on building function, emphasizing that structural seismic design should ensure that buildings can be quickly repaired and restored to a usable seismic resistance level after rare earthquakes.

[0004] In building structures, infill walls, as a common non-structural component, play a crucial role in improving the overall performance and seismic resistance of buildings. However, traditional masonry infill walls are susceptible to damage during earthquakes, impacting the durability and safety of buildings. Various improvement methods have been proposed to enhance the seismic performance of infill walls. However, these methods still have some drawbacks, such as significant damage under overall structural deformation and relatively low energy consumption. Summary of the Invention

[0005] The purpose of this invention is to provide a low-damage flexible connection system for infill wall panels and its construction method, thereby reducing the degree of damage to the infill wall under overall structural deformation.

[0006] The objective of this invention can be achieved through the following technical solution: a low-damage infill wall panel flexible connection system, comprising prestressed precast concrete beams, prestressed precast concrete columns, foundations, and precast infill wall panels;

[0007] The prestressed precast concrete beams, prestressed precast concrete columns, and foundation form a frame structure. The precast infill wall panels are waist-shaped and are installed inside the frame structure and connected to the frame structure through connectors.

[0008] Preferably, the prefabricated infill wall panel includes a waist-shaped panel cast from lightweight material and an elastic material wrapped around the outer edge of the waist-shaped panel.

[0009] More preferably, the lightweight material includes steam-pressurized concrete, lightweight ECC concrete, and gypsum board, which are lightweight and have good sound and heat insulation effects.

[0010] More preferably, the elastic material includes rubber, polyurethane, and spring rubber, which have high elasticity and sound and heat insulation effects.

[0011] Preferably, the thickness of the precast infill wall panel is less than that of the prestressed precast concrete beam and the prestressed precast concrete column.

[0012] Preferably, the thickness of the prefabricated infill wall panel is 70-200 mm.

[0013] Preferably, the precast infill wall panel is arranged vertically (the arc-shaped part is located on the upper and lower sides of the main body), the top is connected to the prestressed precast concrete beam through a connector, and the bottom is connected to the foundation through a grooved angle steel limiter.

[0014] More preferably, the top of both sides of the precast infill wall panel is connected to the prestressed precast concrete beam through symmetrically arranged connectors.

[0015] More preferably, the grooved angle steel limiter includes a grooved angle steel, wherein the angle steel has a U-shaped groove at the end connecting to the precast infill wall panel and a bolt hole at the end connecting to the foundation, and a high-strength bolt is detachably installed in the U-shaped groove and the bolt hole. The U-shaped groove is used to support the high-strength bolt rod connected to the precast infill wall panel.

[0016] More preferably, the grooved angle steel limiter is made of high-strength steel or titanium alloy, which has high strength and toughness.

[0017] More preferably, the grooved angle steel limiter has a thickness of 8-12 mm.

[0018] More preferably, the bottom of both sides of the precast infill wall panel is limited by symmetrically arranged grooved angle steel limiters.

[0019] Preferably, multiple precast infill wall panels are arranged in parallel within the frame structure, and the precast infill wall panels located at the edges are limited by connectors installed on prestressed precast concrete columns.

[0020] More preferably, the precast infill wall panels located at the edge are limited on both sides by connectors symmetrically installed on the prestressed precast concrete columns.

[0021] Preferably, a horizontal gap is left between the precast infill wall panel and the prestressed precast concrete beam, and a vertical gap is left between the precast infill wall panel and the prestressed precast concrete column, and the horizontal and vertical gaps are filled with flexible material.

[0022] More preferably, the horizontal gap is 10-20 mm.

[0023] More preferably, the vertical gap is 10-20 mm.

[0024] More preferably, the flexible material includes rubber or polyurethane foam, which has high elasticity and good sound and heat insulation effects.

[0025] More preferably, the flexible material is bonded into the gap.

[0026] More preferably, the outer surface of the flexible material is coated with waterproof and crack-resistant mortar.

[0027] Preferably, there are no gaps between the main bodies of adjacent prefabricated infill wall panels, but there are gaps between the arc-shaped parts, and these gaps are filled with flexible material.

[0028] More preferably, the outer surface of the flexible material is coated with waterproof and crack-resistant mortar.

[0029] Preferably, the connector includes an angle steel with bolt holes, and high-strength bolts are detachably installed in the bolt holes.

[0030] More preferably, the angle steel is made of high-strength steel or titanium alloy, which has high strength and toughness.

[0031] More preferably, the thickness of the angle steel is 8-12 mm.

[0032] Preferably, the prestressed precast concrete beam is vertically connected to the prestressed precast concrete column, the prestressed precast concrete column is vertically connected to the foundation, and both the prestressed precast concrete beam and the prestressed precast concrete column are provided with prestressed steel bars.

[0033] More preferably, the tension of the prestressed steel bars is in the range of 1500-1900 MPa.

[0034] A construction method for the above-mentioned low-damage infill wall panel flexible connection system includes the following steps:

[0035] S1: Install the prestressed precast concrete column on the foundation and install the prestressed precast concrete beam on the prestressed precast concrete column;

[0036] S2: Multiple precast infill wall panels are installed within the frame structure formed by prestressed precast concrete beams, prestressed precast concrete columns, and foundation using connectors and grooved angle steel limiters.

[0037] S3: The gaps between the curved sections of two adjacent precast infill wall panels, as well as the horizontal and vertical gaps between the precast infill wall panels and the frame structure, are filled with flexible materials to form the low-damage infill wall panel flexible connection system.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. This invention can reduce the damage to the block infill wall under overall structural deformation, improve the energy consumption level of the structure, and improve the seismic resistance, making it a more earthquake-resistant and resilient infill wall.

[0040] 2. The low-damage infill wall panel and frame flexible connection structure proposed in this invention utilizes prestressed precast concrete beams, columns, and foundations, combined with a flexible connection structure, effectively improving the overall seismic performance of the structure. During an earthquake, this structure can better distribute the seismic load and reduce damage to non-structural components.

[0041] 3. The novel low-damage infill wall panel and frame flexible connection structure proposed in this invention effectively reduces the degree of damage to the infill wall under overall structural deformation by employing a flexible connection structure, a special design for the prefabricated infill wall panels, and the setting of horizontal and vertical gaps. This helps improve the durability and safety of the building, making it easier to restore the structure to normal use.

[0042] 4. This invention uses prestressed precast concrete beams and columns, as well as angle steel connectors and other materials with high strength and toughness, which can improve the energy dissipation level of the structure, making it better able to absorb seismic energy and reduce the damage caused by earthquakes.

[0043] 5. This invention reduces construction procedures and difficulty by using prefabricated components and flexible connection methods. The use of reliable connection methods such as high-strength bolts and angle steel connectors simplifies the construction process, improves construction efficiency, and allows for component replacement, thus reducing maintenance costs.

[0044] 6. The construction method of the novel low-damage infill wall panel and frame flexible connection structure proposed in this invention is relatively simple, reducing construction procedures and difficulties. This not only improves construction efficiency but also reduces construction costs, contributing to the timely completion of the project. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0046] Figure 2This is a schematic diagram of the connection structure between the prestressed precast concrete beam, the prestressed precast concrete column, and the foundation in this invention;

[0047] Figure 3 This is a schematic diagram of the structure of the prefabricated infill wall panel in this invention;

[0048] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0049] Figure 5 for Figure 1 Enlarged view at point B in the middle;

[0050] Figure 6 for Figure 1 Enlarged view at point C;

[0051] Figure 7 This is a structural schematic diagram of the angle steel connector;

[0052] Figure 8 This is a schematic diagram of a slotted angle steel limiter.

[0053] Figure 9 This is a diagram showing the compressive damage of the low-damage infill wall panel flexible connection system in Example 4.

[0054] Figure 10 This is a plastic strain diagram of the low-damage infill wall panel flexible connection system in Example 4;

[0055] In the diagram: 1-Prestressed precast concrete beam, 2-Prestressed precast concrete column, 3-Foundation, 4-Precast infill wall panel, 5-Connector, 6-Groove angle steel limiter, 7-Prestressed steel bar, 8-High-strength bolt, 9-Flexible material. Detailed Implementation

[0056] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0057] Example 1

[0058] A low-damage infill wall panel flexible connection system includes a prestressed precast concrete beam 1, a prestressed precast concrete column 2, a foundation 3, a precast infill wall panel 4, and connectors 5.

[0059] Among them, the prestressed precast concrete column 2 is vertically installed on the foundation 3 by prestressed steel bars 7, and the prestressed precast concrete beam 1 is horizontally installed on the prestressed precast concrete column 2 by prestressed steel bars 7. The prestressed precast concrete beam 1, the prestressed precast concrete column 2 and the foundation 3 form a rectangular frame structure. Multiple precast infill wall panels 4 with waist-shaped structures are arranged in parallel inside the frame structure and connected to the frame structure by connectors 5.

[0060] Example 2

[0061] A low-damage flexible connection system for infill wall panels is provided. The top of the precast infill wall panel 4 is connected to the prestressed precast concrete beam 1 via angle steel connectors 5, and the bottom is connected to the foundation 3 via grooved angle steel limiters 6. The side of the precast infill wall panel 4 located at the edge is limited by angle steel connectors 5 installed on the prestressed precast concrete column 2 to prevent the precast infill wall panel 4 from deflecting out of plane.

[0062] Specifically, the angle steel connector 5 at the top of the precast infill wall panel 4 has pre-drilled high-strength bolt holes for connecting the prestressed concrete beam 1 and the precast infill wall panel 4, while the angle steel connector 5 on the side of the precast infill wall panel 4 only has pre-drilled high-strength bolt holes for connecting the prestressed concrete column 2. The rest is the same as in Example 1.

[0063] Example 3

[0064] A low-damage flexible connection system for infill wall panels includes a prestressed precast concrete beam 1, a prestressed precast concrete column 2, a foundation 3, precast infill wall panels 4, angle steel connectors 5, grooved angle steel limiters 6, and high-strength bolts 8. The prestressed precast concrete beam 1 is hinged to the precast infill wall panel 4 via the angle steel connectors 5 and high-strength bolts 8. The prestressed precast concrete column 2 limits the precast infill wall panel 4 via the angle steel connectors 5 and high-strength bolts 8 to prevent out-of-plane deflection. The foundation 3 limits the precast infill wall panel 4 via the grooved angle steel limiters 6 and high-strength bolts 8 to prevent out-of-plane deflection.

[0065] Example 4

[0066] A low-damage flexible connection system for infill wall panels, such as Figure 1 , Figure 4 , Figure 5 , Figure 6As shown, the structure includes: a prestressed precast concrete beam 1, a prestressed precast concrete column 2, a foundation 3, a precast infill wall panel 4, angle steel connectors 5, a grooved angle steel limiter 6, and high-strength bolts 8. The prestressed precast concrete beam 1 is connected to the precast infill wall panel 4 via the angle steel connectors 5 and the high-strength bolts 8. The prestressed precast concrete column 2 limits the precast infill wall panel 4 via the angle steel connectors 5 and the high-strength bolts 8 to prevent out-of-plane deflection. The foundation 3 limits the precast infill wall panel 4 via the grooved angle steel limiter 6 and the high-strength bolts 8 to prevent out-of-plane deflection.

[0067] Furthermore, in this embodiment, as Figure 2 As shown, the prestressed precast concrete beam 1 has prestressed steel bars 7 for connecting to the prestressed precast concrete column 2 and high-strength bolt sleeves for connecting to the precast infill wall panel 4. The prestressed precast concrete column 2 has prestressed steel bars 7 for connecting to the foundation 3 and high-strength bolt sleeves for connecting to the precast infill wall panel 4. The foundation 3 has high-strength bolt sleeves for connecting to the grooved angle steel limiter 6.

[0068] Furthermore, in this embodiment, as Figure 3 As shown, the precast infill wall panel 4 is a waist-shaped structure. The waist-shaped structure is composed of a lightweight material cast into a waist shape and an elastic material wrapped around its outer edge. The lightweight material is steam-pressurized concrete, and the elastic material is rubber. The thickness of the precast infill wall panel 4 is 135mm. The precast infill wall panel 4 has reserved high-strength bolt holes for hinged prestressed concrete beam 1 and foundation 3, which together with the grooved angle steel limiter 6 serve as a limiting device.

[0069] Furthermore, in this embodiment, as Figure 7 As shown, the angle steel connector 5 is divided into two types, one type of angle steel connector 5 as follows: Figure 7 As shown, it has high-strength bolt holes reserved for hinged prestressed concrete beam 1 and precast infill wall panel 4. Another type of angle steel connector 5 only has high-strength bolt holes reserved for connecting prestressed concrete column 2. Its function is to limit the precast infill wall panel 4 and prevent out-of-plane deflection. The angle steel connector 5 is made of titanium alloy, and the angle steel connector 6 has a thickness of 10mm.

[0070] Furthermore, in this embodiment, as Figure 8 As shown, the grooved angle steel limiter 6 has high-strength bolt holes for connecting the foundation 3 and a U-shaped groove. Its function is to limit the precast infill wall panel 4 and prevent it from deflecting out of the plane. The grooved angle steel limiter 6 is made of titanium alloy and the grooved angle steel limiter 7 is 10mm thick.

[0071] A construction method for the above-mentioned low-damage infill wall panel flexible connection system includes the following specific steps:

[0072] Step 1: First, lay out and position the lines, then install the two prestressed precast concrete columns 2 onto the foundation using prestressed steel bars 7. At the same time, install the prestressed concrete beam 1 between the two prestressed precast concrete columns 2 using prestressed steel bars 7.

[0073] Step 2: Using high-strength bolts 8 and high-strength bolt sleeves, fix two angle steel connectors 5 simultaneously to one side of the prestressed concrete column 2 through the pre-drilled high-strength bolt holes. Then, lay out and position the lines, insert the first precast infill wall panel 4 between the two angle steel connectors 5 and ensure full contact. At the same time, use angle steel connectors 5 and high-strength bolts 8 to hinge the precast infill wall panel 4 and the prestressed precast concrete beam 1. Simultaneously, use grooved angle steel limiters 6, high-strength bolts 8, and foundation 3 to limit the precast infill wall panel 4 to prevent out-of-plane deflection.

[0074] Step 3: After the first precast infill wall panel 4 is installed, the second precast infill wall panel 4 is installed immediately. First, the lines are laid out and positioned. The second precast infill wall panel 4 is moved to the designated position and one side of it is made to fully contact the side of the first precast infill wall panel 4 (i.e., the side wall of the main body is in full contact). At the same time, the precast infill wall panel 4 and the prestressed precast concrete beam 1 are hinged using angle steel connectors 5 and high-strength bolts 8. Meanwhile, the precast infill wall panel 4 is limited by grooved angle steel limiters 6, high-strength bolts 8, and foundation 3 to prevent out-of-plane deflection.

[0075] Step 4: After the second precast infill wall panel 4 is installed, the third precast infill wall panel 4 is installed immediately. The installation process is the same as that of the second precast infill wall panel 4. The installation process of the fourth, fifth, sixth and seventh precast infill wall panels is also the same. The installation process of the eighth precast infill wall panel 4 is the same as that of the first precast infill wall panel 4.

[0076] Step 5: The gaps between the arc-shaped parts of adjacent precast infill wall panels 4 are filled with flexible material 9, thus forming a new type of low-damage infill wall panel and frame flexible connection structure.

[0077] Simulation was performed on the low-damage infill wall panel flexible connection system of this embodiment. Specifically, a simplified model of the low-damage infill wall panel flexible connection system was established using the ABAQUS program. The axial compression ratio was set to 0.5, and the inter-layer displacement angle was set to 1 / 30. The compressive damage and plastic strain of the frame structure and each prefabricated infill wall panel in the low-damage infill wall panel flexible connection system were simulated. Figures 9-10As shown in the connection system of this embodiment, when the frame structure suffers significant damage under strong earthquake action, the prefabricated infill wall panel only suffers minor damage, thus improving the seismic performance of the infill wall.

[0078] 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 low-damage flexible connection system for infill wall panels, characterized in that, It includes prestressed precast concrete beams (1), prestressed precast concrete columns (2), foundation (3), and precast infill wall panels (4). The prestressed precast concrete beams (1), prestressed precast concrete columns (2) and foundation (3) form a frame structure. The precast infill wall panels (4) are waist-shaped structures. The precast infill wall panels (4) are set inside the frame structure and connected to the frame structure through connectors (5). There is no gap between the main body of the adjacent prefabricated infill wall panels (4), but there is a gap between the arc-shaped parts, which is filled with flexible material.

2. The low-damage infill wall panel flexible connection system according to claim 1, characterized in that, The precast infill wall panel (4) includes a waist-shaped panel cast from lightweight material and an elastic material wrapped around the outer edge of the waist-shaped panel.

3. The low-damage infill wall panel flexible connection system according to claim 1, characterized in that, The thickness of the precast infill wall panel (4) is 70-200mm.

4. The low-damage infill wall panel flexible connection system according to claim 1, characterized in that, The precast infill wall panel (4) is set vertically, and its top is connected to the prestressed precast concrete beam (1) through a connector (5), and its bottom is connected to the foundation (3) through a grooved angle steel limiter (6).

5. The low-damage infill wall panel flexible connection system according to claim 4, characterized in that, The grooved angle steel limiter (6) includes a grooved angle steel, wherein the angle steel has a U-shaped groove at the end connected to the precast infill wall panel (4) and a bolt hole at the end connected to the foundation (3), and a high-strength bolt can be detachably installed in the U-shaped groove and the bolt hole.

6. The low-damage infill wall panel flexible connection system according to claim 1, characterized in that, Multiple precast infill wall panels (4) are arranged in parallel within the frame structure. The precast infill wall panels (4) located at the edge are limited by connectors (5) installed on the prestressed precast concrete columns (2).

7. The low-damage infill wall panel flexible connection system according to claim 1, characterized in that, A horizontal gap is left between the precast infill wall panel (4) and the prestressed precast concrete beam (1), and a vertical gap is left between the precast infill wall panel (4) and the prestressed precast concrete column (2). The horizontal gap and the vertical gap are filled with flexible material.

8. The low-damage infill wall panel flexible connection system according to claim 1, characterized in that, The connector (5) includes an angle steel with bolt holes, and a high-strength bolt is detachably installed in the bolt holes.

9. The low-damage infill wall panel flexible connection system according to claim 1, characterized in that, The prestressed precast concrete beam (1) is vertically connected to the prestressed precast concrete column (2), and the prestressed precast concrete column (2) is vertically connected to the foundation (3). Both the prestressed precast concrete beam (1) and the prestressed precast concrete column (2) are equipped with prestressed steel bars (7).

10. A construction method for the low-damage infill wall panel flexible connection system according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Install the prestressed precast concrete column (2) on the foundation (3) and install the prestressed precast concrete beam (1) on the prestressed precast concrete column (2); S2: Multiple precast infill wall panels (4) are installed in the frame structure formed by prestressed precast concrete beams (1), prestressed precast concrete columns (2) and foundation (3) through connectors (5) and grooved angle steel limiters (6); S3: The gaps between the arc-shaped parts of two adjacent precast infill wall panels (4) and the horizontal and vertical gaps between the precast infill wall panels (4) and the frame structure are filled with flexible materials to form the low-damage infill wall panel flexible connection system.

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