A flexible connection structure between prefabricated infill wall and prefabricated frame column

Abstract

The present invention belongs to the field of building technology, and particularly relates to a flexible connection structure between a prefabricated infill wall and a prefabricated frame column. The technical solution is as follows: it comprises a prefabricated steel member I, a prefabricated steel member II and connecting steel bars, wherein the prefabricated steel member I is a square tube structure, fixedly arranged on the side of the prefabricated frame column, and provided with a vertical slide groove; the two ends of the prefabricated steel member II are dumbbell-shaped sliders and hooks respectively; one end of the connecting steel bar is embedded in the prefabricated infill wall, and the other end of the connecting steel bar is an O-shaped end; the slider is placed in the slide groove, and the hook hooks the O-shaped end to flexibly connect the prefabricated infill wall and the prefabricated frame column together. The present invention can solve the problem of the additional stress on the tie bars caused by the settlement deformation of the prefabricated infill wall, improve the local seismic performance of the structure, and has a simple structure, clear force transmission, good integrity, convenient construction, and safety and reliability.

Description

Technical Field

[0001] The invention belongs to the field of building technology, and in particular relates to a flexible connection structure between a prefabricated filling wall and a prefabricated frame column. Background Art

[0002] In building structures, the addition of infill walls increases the lateral stiffness of the main frame structure, thereby amplifying seismic effects. In engineering design, infill walls are treated in two ways: as structural components or as non-structural components. In practice, for computational convenience, infill walls are often simply treated as non-structural components. Design calculations only consider the infill walls' deadweight, ignoring their seismic bearing capacity. Their impact on the overall structural stiffness is approximated using the natural vibration period reduction factor. This results in relatively safe and reliable frame beams and columns during minor earthquakes, but severe damage to the infill walls during moderate earthquakes, increasing economic losses and repair costs and even resulting in casualties. The connection between infill walls and the frame is primarily categorized as rigid or flexible. Rigid connections include mortar bonding between the infill wall and frame columns, and diagonal masonry between the infill wall and frame beams. Flexible connections involve disconnecting the frame and infill wall, connecting them with tie bars, and filling gaps with filler material.

[0003] Currently, rigid connections between the infill wall and the frame are the primary mechanism for rigid connection. The high in-plane stiffness and low shear strength of rigidly connected infill walls result in severe in-plane damage during earthquakes, exacerbating seismic damage. Without a reliable tie between the infill wall and the frame, out-of-plane collapse can occur, triggering secondary damage. Furthermore, the infill wall provides lateral support for the frame beams, and bending deformation of the frame beams creates additional stress on the infill wall. The primary cause of seismic damage from rigid connections is that the infill wall restricts the lateral deformation of the main frame components. By decoupling the masonry infill wall from the frame columns, allowing the main frame structure to deform freely during earthquakes, the infill wall is not subjected to compression, thus preventing it from participating in the distribution of seismic forces and eliminating its lateral support constraint on the main frame, thereby mitigating damage. Based on this principle, the "Code for Seismic Design of Buildings" stipulates that "masonry infill walls in reinforced concrete structures should be decoupled from the columns or have flexible connections."

[0004] The existing flexible connection between frame columns and prefabricated walls uses chemical rebar embedding and pre-embedded steel bars. The method of embedding tie bars in frame columns is not securely tied, which can easily lead to displacement of the tie bars during the column concrete vibration process, and in severe cases, the bars may slip. Drilling holes in the formwork to embed tie bars solves the problems of controlling the position of the tie bars and chiseling concrete, but it greatly increases the difficulty of removing the formwork and damages the formwork. Using short steel bars will require a lot of welding work, and the quality of the welding is difficult to guarantee. Due to the displacement of the tie bars or the change in the size of the masonry skin rods, it is difficult to embed the tie bars in the horizontal mortar joints of the masonry, resulting in the bending of the tie bars, which cannot effectively play the role of tying, especially for large-sized block walls. The success or failure of the chemical rebar embedding method employed depends primarily on numerous factors, including the quality of the concrete substrate, the quality of the rebar, the strength of the adhesive, the depth of the rebar embedded in the concrete (anchor length), the construction temperature, the quality of the hole, the cleanliness of the hole, and the degree of dryness and wetness within the hole. Furthermore, the chemical rebar embedding method cannot address the additional stress generated at the connection between the tie bars and the precast wall due to post-construction settlement. These issues severely impact structural safety, reduce the structure's seismic performance, and pose quality and safety risks to the project. To date, there is no effective flexible connection between the precast wall and precast frame columns that can effectively address the impact of infill wall settlement on the tie bars. Summary of the Invention

[0005] The present invention provides a flexible connection structure between a prefabricated infill wall and a prefabricated frame column, which solves the problem of additional stress on the tie bars caused by settlement deformation of the prefabricated infill wall, improves the local seismic performance of the structure, and has simple structure, clear force transmission, good integrity, convenient construction, and safety and reliability.

[0006] The technical solutions of the present invention are as follows:

[0007] A flexible connection structure between a prefabricated infill wall and a prefabricated frame column comprises a prefabricated steel component I, a prefabricated steel component II and connecting steel bars. The prefabricated steel component I is a square tube structure and is fixedly mounted on the side of the prefabricated frame column. A vertical slide groove is provided on the prefabricated steel component I. The two ends of the prefabricated steel component II are respectively a dumbbell-shaped slider and a hook. One end of the connecting steel bar is embedded in the prefabricated infill wall, and the other end of the connecting steel bar is an O-shaped end. The slider is placed in the slide groove, and the hook hooks the O-shaped end to flexibly connect the prefabricated infill wall and the prefabricated frame column.

[0008] Furthermore, the flexible connection structure between the prefabricated infill wall and the prefabricated frame column is provided with reserved holes at the bottom of the prefabricated infill wall and the prefabricated frame column, and reserved steel bars are provided on the bottom beam. The prefabricated frame column and the prefabricated infill wall are fixed to the bottom beam by fitting the reserved steel bars and the reserved holes.

[0009] Furthermore, in the flexible connection structure between the prefabricated infill wall and the prefabricated frame column, a disengagement gap is left between the prefabricated frame column and the prefabricated infill wall, and the disengagement gap is filled with a filling material.

[0010] The beneficial effects of the present invention are as follows: the present invention reduces the interaction between the prefabricated frame columns and the prefabricated infill walls by a design method of reserving a gap between the prefabricated infill wall and the prefabricated frame column and filling the gap with filling material, thereby providing an ideal flexible connection form; by adopting the flexible connection structure of the present invention, the horizontal steel bars of the wall can settle simultaneously with the prefabricated wall, which can solve the problem of the tie bars being affected by additional stress caused by the settlement of the prefabricated infill wall after construction in traditional practices; the flexible connection structure of the present invention has reasonable force, simple operation, convenient construction and strong durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the assembled facade is shown, showing the connection between the prefabricated infill wall and the prefabricated frame column via a flexible connection structure;

[0012] Figure 2 A schematic diagram of the assembly plan of the prefabricated infill wall and the prefabricated frame column connected by a flexible connection structure;

[0013] Figure 3 This is a schematic elevation diagram of the connection between the prefabricated frame column and the prefabricated steel member I;

[0014] Figure 4 This is the structural drawing of prefabricated steel component II;

[0015] Figure 5 This is a schematic elevation diagram of the connection between steel bars and prefabricated infill walls. DETAILED DESCRIPTION

[0016] like Figure 1-5As shown, a flexible connection structure between a prefabricated infill wall and a prefabricated frame column includes a prefabricated steel member I3, a prefabricated steel member II4, and a connecting steel bar 9. The prefabricated steel member I3 is a square tube structure and is fixedly arranged on the side of the prefabricated frame column 2. The prefabricated steel member I3 is provided with a vertical slide 6; the two ends of the prefabricated steel member II4 are dumbbell-shaped sliders 7 and hooks 8 respectively; one end of the connecting steel bar 9 is embedded in the prefabricated infill wall 1, and the other end of the connecting steel bar 9 is an O-shaped end 1 0; the slider 7 is placed in the slide groove 6, and the hook 8 hooks the O-shaped end 10 to flexibly connect the prefabricated infill wall 1 and the prefabricated frame column 2; reserved holes are provided at the bottom of the prefabricated infill wall 1 and the prefabricated frame column 2, and reserved steel bars are provided on the bottom beam 5. The prefabricated frame column 2 and the prefabricated infill wall 1 are connected and fixed to the bottom beam 5 by fitting the reserved steel bars and the reserved holes; a disengagement gap is left between the prefabricated frame column 2 and the prefabricated infill wall 1, and the disengagement gap is filled with filling material.

[0017] Prefabricated steel members I3 and II4 can be assembled on site by inserting the dumbbell-shaped slider 7 of prefabricated steel member II4 from the top of prefabricated steel member I3 into the vertical chute 6, allowing the slider 7 to slide up and down within prefabricated steel member I3 without sliding out. According to the corresponding position of the actual laying of connecting steel bars 9, the slider 7 of prefabricated steel member II4 is slid, and the hook 8 is hooked onto the O-shaped end 10. The gap between the prefabricated frame column 2 and the prefabricated infill wall 1 is filled with filling material to provide a flexible connection.

Claims

1. A flexible connection structure between a prefabricated infill wall and a prefabricated frame column, characterized in that: It includes a prefabricated steel component I, a prefabricated steel component II and connecting steel bars. The prefabricated steel component I is a square tube structure. The prefabricated steel component I is fixedly arranged on the side of the prefabricated frame column. The prefabricated steel component I is provided with a vertical slide groove; the two ends of the prefabricated steel component II are a dumbbell-shaped slider and a hook respectively; one end of the connecting steel bar is embedded in the prefabricated infill wall, and the other end of the connecting steel bar is an O-shaped end; the slider is placed in the slide groove, and the hook hooks the O-shaped end to flexibly connect the prefabricated infill wall and the prefabricated frame column together; reserved holes are provided at the bottom of the prefabricated infill wall and the prefabricated frame column, and reserved steel bars are provided on the bottom beam. The prefabricated frame column and the prefabricated infill wall are connected and fixed on the bottom beam through the reserved steel bars and the reserved holes; a disengagement gap is left between the prefabricated frame column and the prefabricated infill wall, and the disengagement gap is filled with filling material.

Images