Rubber mortar joint filling assembly type reinforced concrete energy dissipation composite column connected through steel sleeves

Abstract

The invention discloses a rubber mortar joint filling assembly type reinforced concrete energy dissipation composite column connected through steel sleeves. The rubber mortar joint filling assembly type reinforced concrete energy dissipation composite column comprises prefabricated concrete standard small columns (prefabricated standard small columns for short), the steel sleeves, rubber mortar joint filling layers and fastening hoops. According to the rubber mortar joint filling assembly type reinforced concrete energy dissipation composite column connected through the steel sleeves, prefabricated standard small columns are connected at beam-column joints through the steel sleeves, gaps exist outside the joints due to separation of partition plates in the steel sleeves between the prefabricated standard small columns, and split columns are formed; gaps between the split columns are filled with rubber mortar interlayers to form a composite monolithic column; and finally, a fastening hoop is additionally arranged at the joint of the steel sleeve and the composite monolithic column. According to the rubber mortar joint filling assembly type reinforced concrete energy dissipation composite column connected through the steel sleeve, under the structural characteristics, the overall column is stressed under the action of small earthquakes or wind loads, the lateral displacement resisting rigidity needed by the interlayer deformation limiting value is met, meanwhile, the rubber mortar joint filling layer provides an elastic energy dissipation function, and the overall damping ratio of the structure is increased; under a medium earthquake, the rubber mortar joint filling layer is locally damaged firstly due to low strength, and earthquake energy is consumed, so that the small split columns in the assembly column are protected; under a large earthquake, the rubber mortar joint filling layer is completely damaged and quits working, the assembly column is stressed according to a split column, the deformability and ductility of the assembly column are greatly improved, and the safety of the whole structure is guaranteed; and after an earthquake, rubber mortar can be filled into the gap of the assembly column again through grouting, and the rubber mortar gap filling assembly type ductile energy dissipation column is formed again.

Description

Technical Field

[0001] The present invention is a steel sleeve-connected rubber mortar-filled assembled reinforced concrete energy-absorbing composite column, which is composed of a prefabricated standard small column, rubber mortar, a steel sleeve, and a fastening hoop, and relates to the fields of construction engineering and structural earthquake resistance. Background Art

[0002] Building industrialization is an inevitable requirement for my country to achieve comprehensive modernization. Prefabricated structures are the main way to achieve building industrialization, and are also an important means to achieve energy conservation and emission reduction. Continuously innovating prefabricated structural forms and improving the safety, reliability and seismic toughness of prefabricated structures are of great significance to promoting the process of building industrialization.

[0003] Earthquake disasters are random, and the actual earthquake intensity may far exceed the seismic fortification cracks (such as the Turkey earthquake in February 2023). Therefore, it is of great significance to innovate and develop high-ductility frame columns to ensure that the overall structure does not collapse under the action of a major earthquake and to ensure the safety of people's lives and property.

[0004] Split column technology is one of the means to achieve high ductility of frame columns. It was first proposed by Hao Yongchang, Hu Qingchang and others. Later, Li Zhongxian, Hao Yongchang and others studied its seismic performance and concluded that split columns can realize the design concept of changing short columns into long columns, greatly improving the ductility and failure mode of reinforced concrete short columns. Li Bingyi, Yuan Quan and others studied the hysteresis characteristics of eight different working condition specimens and concluded that when the axial compression ratio is the same, the bearing capacity, ductility coefficient and deformation of steel-concrete split columns are better than those of reinforced concrete split columns. The above conclusions show that split columns have better seismic energy dissipation performance and ductility. However, due to its significantly reduced stiffness compared with the same cross-section integral column, the inter-layer displacement under conventional wind loads or small earthquakes may exceed the code limit, thus affecting its normal use function. At the same time, in traditional cast-in-place construction, the application of split columns is greatly limited due to difficulties in on-site steel bar binding and formwork setting.

[0005] Therefore, in the context of building industrialization, the present invention proposes a composite frame column structure that is prefabricated in a factory and assembled on site, and uses low-modulus, high-damping, and highly elastic rubber mortar to fill the gaps between the split columns. This can not only achieve normal use requirements under small earthquakes and conventional wind loads, but also ensure structural safety during large earthquakes. It also complies with the idea of ​​multiple seismic defense lines. Summary of the invention

[0006] The purpose of the present invention is to solve the problems raised in the background technology, and to design a steel sleeve connected rubber mortar joint-filled reinforced concrete energy dissipation composite column, the basic form of which is as follows: Figure 1As shown, the prefabricated standard small columns (1) are constrained and connected by the steel sleeve (2) and the fastening hoop (7), and the gaps between the prefabricated standard small columns (1) are filled with rubber mortar (3).

[0007] The prefabricated standard small column (1) is made of reinforced concrete. Its geometric characteristic parameters are: the column height H, the cross-sectional side length w of the small column, such as Figure 2 shown.

[0008] The steel sleeve (2) is composed of an outer steel plate (4), an inner horizontal partition (5), and an inner vertical partition (6). Its geometric characteristic parameters include: the net side length of the steel sleeve area is equal to the side length of the standard small column section w, the height L of the steel sleeve, and the thickness t of the steel plate, such as Figure 3 shown.

[0009] The geometric characteristic parameters of the fastening hoop (7) are: hoop thickness d, hoop height h, and overhanging steel plate thickness a, such as Figure 3 shown.

[0010] The geometric parameter values ​​of each component are determined after research.

[0011] The seismic mechanism of the assembled reinforced concrete energy-absorbing composite column connected by a steel sleeve and filled with rubber mortar is as follows: when a small earthquake or wind load is applied, the column is stressed as a whole, and the lateral displacement stiffness required by the interlayer deformation limit is met. At the same time, the rubber mortar caulking layer provides elastic energy dissipation function, which increases the overall damping ratio of the structure and can reduce the vortex vibration of the structure under pulsating wind loads. Under moderate earthquakes, the rubber mortar caulking layer will first be partially damaged due to its low strength, consuming seismic energy, thereby protecting the small split columns in the assembled column. Under a large earthquake, the rubber mortar caulking layer will be completely damaged and stop working, and the assembled column will be stressed as a split column. On the one hand, the lateral displacement stiffness of the assembled column is reduced and the structural period is extended, thereby reducing the seismic effect of the structure under a large earthquake. On the other hand, the deformation capacity and ductility of the assembled column transformed into a split column are greatly improved, thereby ensuring the safety of the overall structure. The damage forms under different earthquakes are as follows: Figure 8 shown.

[0012] Beneficial effects: 1. The seismic performance of the steel sleeve-connected rubber mortar-filled assembled reinforced concrete energy-absorbing composite column of the present invention is superior to that of the conventional reinforced concrete frame column in terms of strength, stiffness, deformation and energy-absorbing capacity.

[0013] 2. Under normal use, the energy-dissipating column of the present invention has the same appearance as a conventional integral column, and the existence of structural seams will not affect the use function and architectural aesthetics. It fully considers the combination and unity of architectural function and structural seismic resistance function, and has good practicality and economy.

[0014] 3. The energy dissipation column of the present invention is characterized by factory prefabrication and on-site assembly. Its popularization and use will promote the development of my country's building industrialization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a rubber mortar-sealed assembled reinforced concrete energy-absorbing composite column connected by a steel sleeve according to the present invention; Figure 2 It is a schematic diagram of the prefabricated standard small column and the small column steel bar skeleton of the rubber mortar-sealed assembled reinforced concrete energy-absorbing composite column connected by the steel sleeve according to the present invention; Figure 3 It is a DD cross-sectional view of the steel sleeve of the rubber mortar-filled assembled reinforced concrete energy-absorbing composite column connected by the steel sleeve according to the present invention; Figure 4 It is a cross-sectional view of the AA section of the rubber mortar-sealed assembled reinforced concrete energy-absorbing composite column connected by the steel sleeve of the present invention; Figure 5 It is a cross-sectional view of the rubber mortar joint-filled assembled reinforced concrete energy-absorbing composite column BB connected by the steel sleeve of the present invention; Figure 6 It is a cross-sectional view of the CC section of the rubber mortar joint-filled assembled reinforced concrete energy-absorbing composite column connected by the steel sleeve of the present invention; Figure 7 It is a schematic diagram of the fastening hoop of the rubber mortar-sealed assembled reinforced concrete energy-absorbing composite column connected by the steel sleeve according to the present invention.

[0016] Figure 8 It is a schematic diagram of the failure modes of the rubber mortar-sealed assembled reinforced concrete energy-absorbing composite column connected by the steel sleeve of the present invention under different earthquake actions.

[0017] Fig. 9 It is a schematic diagram of a typical connection method of a rubber mortar-filled assembled reinforced concrete energy-absorbing composite column and beam connected by a steel sleeve according to the present invention; Fig.10 This is a schematic diagram of the final steel sleeve-connected rubber mortar-filled assembled reinforced concrete energy-absorbing composite column frame.

[0018] In the figure, 1. Prefabricated standard small column; 2. Steel sleeve; 3. Rubber mortar; 4. Outer steel plate; 5. Inner horizontal partition; 6. Inner vertical partition; 7. Fastening hoop. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "inside", "outside", "horizontal", "vertical" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Example: See Figure 1 The present invention provides a technical solution: a rubber mortar joint-filled assembled reinforced concrete energy-absorbing composite column connected by a steel sleeve, comprising a prefabricated standard small column 1, a steel sleeve 2, a rubber mortar 3, and a fastening hoop 7; the construction process thereof can be described as follows: Phase 1: Factory prefabrication phase.

[0022] Step 1: Prefabricate standard small columns 1 and steel sleeves 2 respectively; Step 2: Assemble the standard small column 1 into split assembly columns of various cross-sectional sizes through the steel sleeve 2; Step 3: Press the designed rubber mortar into the gap between the split columns, cure and shape them, and form a composite integral column containing a rubber mortar interlayer; Step 4: Remove the steel sleeve 2 from both ends of the composite column. To ensure the integrity of the composite column, a temporary hoop may be added to the column body in advance; Step 5: transport the disassembled steel sleeve 2 and the composite integral column containing the rubber mortar interlayer formed in the factory to the construction site; The second stage: on-site assembly stage.

[0023] Step 6: insert the composite integral column containing the rubber mortar interlayer into the steel sleeve 2 to complete the vertical assembly of the column; Step 7: Add a fastening sleeve 7 at the junction of the steel sleeve 2 and the composite integral column, and fasten and lock it with a hexagon socket bolt; Step 8: Connect the prefabricated frame beam and the sleeve. The connection between the steel sleeve and the beam can refer to the existing various dry connection methods, which are not within the scope of protection of this technical innovation. Typical connection methods are as follows: Fig. 9As shown in the figure, the final steel sleeve connected rubber mortar joint filling assembled reinforced concrete energy dissipation composite column frame is shown in Fig.10 shown.

[0024] In this embodiment: When in use, the prefabricated standard small column 1 is the main load-bearing component, and the steel sleeve 2 constrains the prefabricated standard small column 1. The energy dissipation capacity of the composite integral column is enhanced by filling the gap between the split columns with rubber mortar 3. When a small earthquake or wind load acts, the composite column is loaded as an integral column to meet the lateral stiffness required by the interlayer deformation limit. At the same time, the rubber mortar caulking layer provides elastic energy dissipation function, increasing the overall damping ratio of the structure (such as Figure 8 As shown in the left figure); Under moderate earthquakes, the rubber mortar caulking layer is first damaged locally due to its low strength, consuming earthquake energy and thus protecting the small columns in the assembly column (such as Figure 8 As shown in the middle figure); Under a strong earthquake, the rubber mortar caulking layer is completely damaged and out of service, and the assembly column is subjected to force as a split column. In this case, on the one hand, the deformation capacity and ductility of the assembly column are greatly improved, and on the other hand, the lateral stiffness of the assembly column is reduced by multiples, the structural period is extended, and the seismic effect is significantly reduced, thereby ensuring the safety of the overall structure (such as Figure 8 As shown in the right figure); after the earthquake, the empty joints of the assembled columns can be filled with rubber mortar again through grouting to re-form rubber mortar-filled assembled ductile energy-absorbing columns.

[0025] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions. The sentence "includes an element defined by ..." does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel sleeve-connected rubber mortar-sealed assembled reinforced concrete energy-absorbing composite column, comprising a prefabricated standard small column (1), a steel sleeve (2), a rubber mortar (3), and a fastening hoop (7), characterized in that: The prefabricated standard small columns (1) are constrained and connected by the steel sleeves (2) and the fastening hoop (7), and the gaps between the prefabricated standard small columns (1) are filled with rubber mortar (3).

2. The rubber mortar joint-filled assembled reinforced concrete energy-absorbing composite column connected by a steel sleeve according to claim 1 is characterized in that: The material used for the prefabricated standard small column (1) is reinforced concrete, the column body cross-section is square, and it is prefabricated in a factory according to the module or design requirements.

3. The rubber mortar joint-filled assembled reinforced concrete energy-absorbing composite column connected by a steel sleeve according to claim 1 is characterized in that: The steel sleeve (2) is composed of an outer steel plate (4), an inner horizontal partition plate (5), and an inner vertical partition plate (6); the thickness of each steel plate must be determined through design to meet the requirements of the node force performance.

4. The rubber mortar joint-filled assembled reinforced concrete energy-absorbing composite column connected by a steel sleeve according to claim 1 is characterized in that: The rubber mortar (3) is composed of cement mortar added with waste rubber and reinforcing fibers, has good ductility, and its formula is determined through research.

5. The rubber mortar joint-filled assembled reinforced concrete energy-absorbing composite column connected by a steel sleeve according to claim 1 is characterized in that: The fastening sleeve (7) is located at the junction of the sleeve and the composite column, has a size slightly smaller than that of the composite column, and can be fastened and locked by a hexagon socket bolt.

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