Prefabricated shock-absorbing partition wall-frame structure with variable friction force energy dissipation and its construction method

Abstract

The present invention relates to a prefabricated shock-absorbing partition-wall frame structure with variable friction force energy dissipation and its construction method, which includes a peripheral frame, prefabricated shock-absorbing partition-wall panels, rubber pads, friction shock-absorbing layers, horizontal force-transferring fasteners, and angle steel restraint members. Compared with the prior art solutions, the technical solution provided by the present invention is applicable to new buildings and existing buildings, and the partition wall can significantly increase its sliding friction force as the inter-story displacement increases. Therefore, it has a relatively larger hysteresis area and higher energy dissipation capacity, can provide a relatively high additional damping ratio for the structure, and reduce the seismic action. In addition, based on the idea of placing the sliding surface at the bottom and setting shear-resistant members between the partition-wall panels, the present invention can better achieve the overall damage control of the partition wall and ensure the energy dissipation capacity of the partition wall under bidirectional seismic action.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic reduction in civil construction, and particularly relates to a prefabricated seismic reduction partition wall-frame structure with variable friction energy dissipation and a construction method thereof. Background Art

[0002] Partition walls are an important part of frame structures and have functions such as enclosure, heat preservation, moisture proof, and sound insulation. In the seismic design of structures, the modeling of partition walls is usually ignored, and the partition walls are only simplified as line loads, and the influence of partition walls on the structure is considered by means of period reduction. However, the above design method actually ignores the brittle and vulnerable characteristics of partition walls. The strong constraint effect between the partition wall and the peripheral frame structure will, on the one hand, cause serious damage to the partition wall under earthquakes, and on the other hand, will significantly increase the lateral stiffness of the structure, thereby changing the original plane stiffness and vertical stiffness of the structure, making the structure prone to weak story failure and short column failure, which goes against the realization of the "strong column-weak beam" design concept.

[0003] How to achieve damage control and toughness improvement of partition walls under earthquakes has important scientific significance. To achieve the above goals, domestic and foreign scholars mainly study the damage control of partition walls from two aspects: "strengthening" and "weakening". The "strengthening" scheme avoids serious damage to the wall by "resisting firmly", and the main implementation methods include setting steel bars or studs in the wall (as shown in Figure 1 ), strengthening the wall surface with fiber composite reinforcing materials, etc. The "weakening" scheme realizes the damage control of the partition wall based on the idea of "decoupling" the partition wall and the frame, and the main implementation methods include changing the boundary connection structure between the wall and the frame (such as using flexible connections), the connection structure between walls (such as setting multiple preset sliding joints in the partition wall, as shown in Figure 2 、 Figure 3 ), etc. By comparing the existing technical solutions and relevant test results, it can be found that when the "weakening" scheme is used for the damage control and toughness improvement of partition walls, its effect is usually better than that of the "strengthening" scheme, but there are still the following problems that need to be further improved and solved:

[0004] 1. Weak seismic reduction ability

[0005] Utilizing the sliding friction energy dissipation between partition walls is the main method to enable partition walls to have seismic reduction functions. The energy dissipation capacity of sliding friction energy dissipation is related to the normal force and friction coefficient of the sliding friction surface. Since partition walls tend to be lightweight, existing technical solutions (such as patent: 202210367123.3) usually make partition walls have certain seismic reduction functions by laying friction layers (increasing the friction coefficient). However, it should be clear that as Figure 4As shown, the friction force-displacement envelope curves provided by the existing technical solutions are mostly flat rectangles, and the energy dissipation capacity is relatively limited. When the structure is subjected to a moderate or large earthquake, the additional damping ratio provided by the existing technical solutions for the structure is usually small, and it is difficult to effectively reduce the earthquake effect. Therefore, how to make the hysteresis behavior predictable and designable on the basis of improving the friction coefficient, and further improve the normal force of the sliding friction surface without changing the lightweight characteristics of the partition wall, so that the partition wall can provide a relatively high additional damping ratio for the structure is one of the important research directions for achieving energy dissipation and shock reduction of the partition wall and improving toughness.

[0006] 2. Difficulty in damage control

[0007] In order to achieve overall damage control of the partition wall, the existing technical solutions (such as patent numbers: CN201110156375.3 and 202210367123.3) usually divide the partition wall into multiple partition wall units. When an earthquake occurs, the partition wall units will slide along the preset sliding joints between the units and thus leave multiple sliding through cracks in the middle of the wall surface (such as Figure 2 , Figure 3 As shown in the figure, this will affect the time and cost of post-earthquake repair to a certain extent. For key fortification buildings that need to undertake disaster relief and treatment tasks after an earthquake, equipment pipelines are usually buried in the partition walls. Once the partition walls of the existing technical solution (with many preset sliding joints in the partition walls) slide during an earthquake, there is a high probability that the equipment pipelines in the partition walls will be damaged, which will in turn affect the post-earthquake disaster relief and treatment work.

[0008] 3. Poor two-way synergy

[0009] Under the actual earthquake, the partition wall is in a bidirectional stress state, and the in-plane behavior and out-of-plane behavior influence and restrict each other. Therefore, the partition wall needs to be regarded as a non-structural component of in-plane displacement type and out-of-plane acceleration type. From this perspective, the seismic damage control of the partition wall is more difficult than that of the structural component. However, the existing technical solutions (such as patent numbers: CN201110156375.3 and 202210367123.3) usually only consider the seismic reduction behavior of the partition wall under the in-plane load, but do not consider its behavior under the bidirectional in-plane and out-of-plane loads. Therefore, there is a certain probability that the partition wall will stop working prematurely under the actual earthquake, and the expected energy dissipation and shock reduction goals cannot be achieved.

[0010] 4. Low construction coordination

[0011] With the popularization of building prefabrication, using precast partition panels instead of traditional masonry partitions has become the current development trend in the industry. However, existing technical solutions still mostly conduct research on seismic performance based on traditional masonry partitions. Although a certain amount of research has been carried out on precast partition panels, most of them use horizontal precast partition panels or large-area precast partition panels. When using horizontal precast partition panels, it is usually considered that they are more suitable for the exterior facade of factory buildings, but their out-of-plane bearing capacity and applicable span are relatively small. When using large-area precast partition panels, it is usually not convenient for the entry and installation of partition panel components. In addition, summarizing existing technical solutions, it is found that some current partition seismic reduction technologies are more suitable for new buildings, such as the need to embed connecting parts and connecting bars, etc. However, the existing building area in China has exceeded 72 billion square meters, and 30% - 50% of the buildings have problems such as reduced safety or functional degradation. Therefore, how to combine partition seismic reduction technology with the improvement of the seismic performance of existing buildings is an important development direction in this technical field. Summary of the Invention

[0012] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a variable-friction energy-dissipating prefabricated seismic reduction partition-wall frame structure and its construction method, which can adapt to the existing construction technology, increase the structural prefabrication rate, improve the overall damage control ability and two-way deformation coordination ability of the partition wall, and make the partition wall have the characteristics of variable friction and variable damping energy dissipation by utilizing the rotation of frame joints and inter-story deformation, thereby effectively reducing the seismic action and realizing the toughness improvement of the partition wall and the structure.

[0013] The technical solution provided by the present invention is as Figure 5 shown. Combining with the existing seismic design method, it is designed to be in a decoupled working state under minor earthquakes and a variable-friction seismic reduction working state under medium and major earthquakes. The following explains the two working states and working principles designed by the present invention.

[0014] Decoupled working state under minor earthquakes: When the variable-friction energy-dissipating prefabricated seismic reduction partition-wall frame structure is subjected to minor earthquake action, the partition wall enters the decoupled working state under minor earthquakes. In this working state, the partition wall will generate frictional hysteretic energy dissipation under the action of horizontal seismic reciprocating force. At this time, the sliding friction force is approximately equal to the product of the wall weight and the friction coefficient of the sliding surface. Since the friction force is usually small in this state, and the left and right sides and the top of the partition wall are mainly flexibly connected to the peripheral frame, the constraint effect between the partition wall and the frame is significantly released, and the structure can be approximately equivalent to a pure frame system.

[0015] Variable-friction seismic reduction working state under medium and major earthquakes: When the variable-friction energy-dissipating prefabricated seismic reduction partition-wall frame structure is subjected to medium and major earthquake action, the partition wall enters the variable-friction seismic reduction working state. Figure 6 It is a schematic diagram before the present invention enters the variable-friction seismic reduction working state. Figure 7This is a schematic diagram of the present invention entering the variable friction damping working state. In this working state, the rubber pads at the upper corners of the partition wall panel are compressed due to the rotation of the frame joints, causing the partition wall to receive the pressure caused by the joint rotation, thereby increasing the normal force of the friction surface, and this normal force will increase with the increase of the inter-story displacement of the structure. Take the force isolation body of the partition wall, as Figure 8 shown. At this time, the partition wall is subjected to the horizontal thrust of the outer frame, the vertical pressure transmitted by the rubber pads, the horizontal friction force and normal force of the friction surface, and the self-weight of the partition wall. Compared with the constant friction energy dissipation mechanism, the technical solution provided by the present invention is based on the working mechanism of variable friction force sliding energy dissipation of the partition wall, which can significantly release the wall-frame constraint effect while increasing the friction damping energy dissipation of the partition wall with the increase of the earthquake intensity, increasing the additional damping ratio of the structure, reducing the seismic action, and avoiding problems such as significant stiffness mutation, large top displacement, excessive inter-story displacement, and torsional irregularity easily caused by traditional partition walls.

[0016] The technical solution provided by the present invention can effectively achieve the overall damage control of the partition wall based on the above two working states and the method of setting shear-resistant members between the partition wall panels, that is, the partition wall will not appear multiple inter-panel sliding cracks or large-area severe damage inside the panel under the action of an earthquake. In particular, since the partition wall can achieve good in-plane damage control, the partition wall will not cause a significant reduction in the out-of-plane bearing capacity due to excessive in-plane damage under the action of out-of-plane seismic inertial forces, so the probability of the partition wall collapsing out of plane can be effectively reduced. At the same time, when the structure is subjected to bidirectional seismic action, a variable friction force energy dissipation prefabricated damping partition wall provided by the present invention will allow the partition wall to undergo a certain amount of warping without significantly affecting the realization of the variable friction force energy dissipation mechanism of the partition wall.

[0017] Specifically, to achieve the above working state and purpose, the present invention adopts the following technical solutions, including an outer frame, prefabricated damping partition wall panels, rubber pads, a friction damping layer, horizontal force transfer clips, and angle steel restraint members.

[0018] The outer frame includes a frame top beam, a frame bottom beam, a frame left column, and a frame right column. The frame top beam and the frame bottom beam are of equal length and parallel, and the two ends of the frame top beam and the bottom beam are respectively and reliably connected to the frame left column and the right column.

[0019] The prefabricated damping partition wall panels include two side prefabricated damping partition wall panels and several intermediate prefabricated damping partition wall panels.

[0020] The basic shape of the side prefabricated damping partition wall panel is a vertical rectangular strip board, but there are cutouts at the upper corners, angle steel for wrapping the corners at the lower part, and internal reinforcement is arranged according to the structure and shear-resistant members are arranged on both sides along the height of the wall panel.

[0021] Furthermore, a rubber pad is installed at the incision. The rubber pad successively includes an upper sealing plate, rubber, and a lower sealing plate from top to bottom, and the stiffness can be designed according to requirements in accordance with the relevant specifications of the current isolation rubber pad. By setting the rubber pad, the damage to the wall panel and the fasteners can be reduced, making the friction energy dissipation designable and predictable.

[0022] Furthermore, the upper sealing plate usually has a relatively large stiffness and a protrusion at the top. The protrusion contacts the bottom surface of the top beam of the frame; the lower sealing plate and the incision can be reliably connected by epoxy resin glue or other means. It should be noted that the setting of the protrusion and the upper sealing plate can make the rubber pad in an approximately uniformly compressed state under in-plane and out-of-plane loads, making the vertical stiffness of the rubber pad designable and predictable.

[0023] Furthermore, the angle steel for corner wrapping is located on both sides of the bottom of the side assembled shock isolation partition wall panel, which can avoid the stress concentration phenomenon at the bottom of the assembled shock isolation partition wall panel under bidirectional loads and is welded to the structural reinforcement.

[0024] Furthermore, the structural reinforcement can be designed according to the current specifications for lightweight partition wall panels. The shear-resistant members are welded to the structural reinforcement, that is, the angle steel for corner wrapping, the structural reinforcement, and the shear-resistant members jointly form the steel cage framework of the side assembled shock isolation partition wall panel.

[0025] The structure of the middle assembled shock isolation partition wall panel is the same as that of the side assembled shock isolation partition wall panel, but the incision is not provided at the upper side corner, and the rubber pad is not included.

[0026] Furthermore, when splicing the middle assembled shock isolation partition wall panel and the side assembled shock isolation partition wall panel and splicing several middle assembled shock isolation partition wall panels, the shear-resistant members are aligned with each other and closely fitted during splicing.

[0027] Furthermore, the reliable connection between the assembled shock isolation partition wall panels is achieved through the weld connection after the docking of the shear-resistant members. The weld connection is uniformly and continuously welded along the gap after the shear-resistant members are closely fitted.

[0028] The assembled shock isolation partition wall panel is located on the top of the frame bottom beam, and a friction shock isolation layer is provided between the two. The friction shock isolation layer can be formed by laying low-strength mortar on the top surface of the frame bottom beam.

[0029] Furthermore, a horizontal force transfer clip is provided at the top of the gap between the side prefabricated shock-absorbing partition wall panel and the left frame column and the right frame column. The horizontal force transfer clip can be formed by casting high-strength concrete (or high-strength mortar, etc.) in the gap after formwork erection. It should be noted that the horizontal force transfer clip is the main force transfer component that enables the prefabricated shock-absorbing partition wall panel to undergo sliding friction under the action of horizontal seismic reciprocating forces.

[0030] Furthermore, other gaps between the prefabricated shock-absorbing partition wall panel and the frame top beam, the left frame column, and the right frame column are filled with flexible materials, and the flexible materials should have functions such as heat preservation, sound insulation, and moisture protection.

[0031] Furthermore, the angle steel restraint can be installed between the prefabricated shock-absorbing partition wall panel and the peripheral frame according to the current lightweight partition wall panel specifications to ensure that the prefabricated shock-absorbing partition wall panel has reliable out-of-plane load-bearing capacity.

[0032] The present invention also discloses a construction method for a prefabricated shock-absorbing partition wall-frame structure with variable friction energy dissipation, including the following steps:

[0033] Step 1: Fabricate the prefabricated shock-absorbing partition wall panel in a prefabrication factory and transport it to the construction site;

[0034] Step 2: Complete the construction of the peripheral frame and position the prefabricated shock-absorbing partition wall panel within the frame;

[0035] Step 3: Synchronously install the prefabricated shock-absorbing partition wall panel, the friction shock-absorbing layer, and the angle steel restraint;

[0036] Step 4: Install the horizontal force transfer clip;

[0037] Step 5: Fill other gaps between the peripheral frame and the prefabricated shock-absorbing partition wall panel with flexible materials.

[0038] Compared with the prior art, the present invention can at least achieve the following beneficial effects:

[0039] 1. Improve the energy dissipation and shock absorption capacity

[0040] A prefabricated shock-absorbing partition wall-frame structure with variable friction energy dissipation has a small earthquake decoupling working state and a medium and large earthquake variable friction shock-absorbing working state. Therefore, compared with the existing technical solutions, the wall frame constraint effect can be ignored under small earthquakes, and the structure can be approximately equivalent to a pure frame system. In the structural design stage, the natural vibration period of the structure can be reduced or not reduced, thereby optimizing the structural design. Under medium and large earthquakes, the sliding friction energy dissipation capacity provided by the present invention increases with the increase of node rotation and inter-layer displacement. Therefore, the greater the earthquake effect, the stronger the energy dissipation and shock-absorbing capacity and the relatively higher additional damping ratio are, which can effectively solve the problems of insufficient energy dissipation capacity of the existing technical solutions, difficult prediction of hysteresis behavior, and the traditional partition walls are prone to sudden stiffness changes, large top-level displacements, excessive inter-layer displacements and irregular torsion.

[0041] 2. Achieve overall damage control

[0042] The assembled shock-absorbing partition wall-frame structure with variable friction energy dissipation realizes the decoupling of the partition wall and the frame, so it can effectively release the constraint effect of the wall frame and avoid large-scale damage to the partition wall due to excessive rigidity. Compared with the existing technical solutions, the present invention is based on the idea of ​​placing the sliding surface at the bottom and setting shear members between the partition wall boards, which can achieve the overall damage control of the partition wall to the greatest extent, effectively avoid the appearance of multiple sliding through cracks in the partition wall surface, and thus is expected to reduce the post-earthquake repair time and cost of the structure to a certain extent, in line with the construction goal of "resilient urban and rural areas".

[0043] 3. Improve two-way collaborative energy consumption

[0044] The assembled shock-absorbing partition wall-frame structure with variable friction energy dissipation can achieve better in-plane damage control, so the partition wall will not cause a significant reduction in out-of-plane bearing capacity due to excessive in-plane damage under the action of out-of-plane seismic inertia force. Compared with the existing technical solutions, when the structure is subjected to bidirectional seismic action, the technical solution provided by the present invention allows the partition wall to have a certain degree of warping without significantly affecting the realization of the variable friction energy dissipation mechanism of the partition wall, so it can basically achieve the goal of similar in-plane energy dissipation capacity and bidirectional energy dissipation capacity.

[0045] 4. Adapt to existing construction conditions

[0046] The variable friction energy dissipation assembled shock-absorbing partition wall-frame structure is composed of vertical prefabricated partition wall panels, so compared with the existing technical solutions, the present invention can be better applied to residential, office, commercial and other types of buildings. In addition, since the present invention has the characteristics of small intervention in existing buildings and does not change the stress of existing building structural components, it can still be used to improve the seismic performance of existing buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0048] Figure 1 Schematic diagram of the "reinforcement" solution in the prior art solution;

[0049] Figure 2 Schematic diagram of the "weakening" solution in the prior art solution Figure 1 ;

[0050] Figure 3 Schematic diagram of the "weakening" solution in the prior art solution Figure 2 ;

[0051] Figure 4 Schematic diagram of the finite element numerical calculation results of the typical friction-displacement curve of the prior art solution;

[0052] Figure 5 Overall structure schematic diagram of the shock-absorbing partition wall-frame structure provided in the embodiment of the present invention;

[0053] Figure 6 Schematic diagram of the mechanism for realizing variable friction energy dissipation in the embodiment of the present invention Figure 1 ;

[0054] Figure 7 Schematic diagram of the mechanism for realizing variable friction energy dissipation in the embodiment of the present invention Figure 2 ;

[0055] Figure 8 Schematic diagram of the mechanism for realizing variable friction energy dissipation in the embodiment of the present invention Figure 3 ;

[0056] Figure 9 Schematic diagram of the side assembled shock-absorbing partition wall panel (Figure a) and its internal structure (Figure b) in the embodiment of the present invention;

[0057] Figure 10 Schematic diagram of the rubber pad in the embodiment of the present invention;

[0058] Figure 11 Schematic diagram of the middle assembled shock-absorbing partition wall panel (Figure a) and its internal structure (Figure b) in the embodiment of the present invention;

[0059] Figure 12 Schematic diagram of the finite element modeling of the sample specimen in Example 3;

[0060] Figure 13Schematic diagram of the finite element modeling of the control specimen in Example 3;

[0061] Figure 14 Schematic diagram of the finite element numerical calculation results of the typical friction force-displacement curve of the present invention;

[0062] Wherein, 1 - outer frame, 11 - top beam of the frame, 12 - bottom beam of the frame, 13 - left column of the frame, 14 - right column of the frame, 15 - frame beam-column joint, 2 - side assembled shock-absorbing partition board, 21 - vertical stress-bearing steel bars of the side partition board, 22 - transverse distribution steel bars of the side partition board, 23 - first corner angle steel, 24 - first shear-resistant member, 3 - rubber pad, 31 - upper sealing plate, 32 - rubber, 33 - lower sealing plate, 34 - protrusion, 4 - middle assembled shock-absorbing partition board, 41 - vertical stress-bearing steel bars of the middle partition board, 42 - transverse distribution steel bars of the middle partition board, 43 - second corner angle steel, 44 - second shear-resistant member, 5 - horizontal force-transferring clip, 6 - angle steel restraint, 7 - friction shock-absorbing layer, 101 - stud, 102 - preset sliding joint. Detailed implementation manners

[0063] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0064] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] For the convenience of description, if the words "upper", "lower", "left", and "right" appear in the present invention, they only indicate the same directions as the upper, lower, left, and right of the accompanying drawings themselves, and do not limit the structure. It is 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0066] Example 1

[0067] As Figure 5 shown, a variable friction energy-dissipating assembled shock-absorbing partition-wall frame structure provided by the present invention includes an outer frame 1, and an assembled shock-absorbing partition board with variable friction energy-dissipating function is installed inside the outer frame 1.

[0068] The peripheral frame includes a frame top beam 11, a frame bottom beam 12, a frame left column 13, and a frame right column 14. The frame top beam 11 and the frame bottom beam 12 are of equal length and parallel to each other. The frame left column 13 and the frame right column 14 are parallel to each other. The ends of the frame top beam 11 and the frame bottom beam 12 are reliably connected to the frame left column 13 and the frame right column 14.

[0069] The prefabricated shock-absorbing partition board includes two side prefabricated shock-absorbing partition boards 2 and several intermediate prefabricated shock-absorbing partition boards 4 located between the two side prefabricated shock-absorbing partition boards 2. The out-of-plane reliable restraint between the partition board and the peripheral frame is achieved through angle steel restraint members 6. The specific layout spacing and position can refer to the current code standards. Specifically, the angle steel restraint members 6 are installed between the prefabricated shock-absorbing partition board and the peripheral frame to ensure that the prefabricated shock-absorbing partition board has reliable out-of-plane load-bearing capacity.

[0070] Please refer to Figure 9 , the internal skeleton of each side prefabricated shock-absorbing partition board 2 includes side partition board vertical stress-bearing steel bars 21, side partition board horizontal distribution steel bars 22, first corner angle steel 23, and first shear-resistant members 24. Notches are provided at the upper side corners of the side prefabricated shock-absorbing partition board. First corner angle steel 23 is provided on both sides of the bottom. The internal reinforcement is arranged according to the structure, and first shear-resistant members 24 are provided on both sides along the height of the wallboard, and the first shear-resistant members 24 in the side prefabricated shock-absorbing partition board 2 are welded to the second shear-resistant members 44 in the adjacent intermediate prefabricated shock-absorbing partition board 4.

[0071] Please refer to Figure 11 , the internal skeleton of each intermediate prefabricated shock-absorbing partition board 4 includes intermediate partition board vertical stress-bearing steel bars 41, intermediate partition board horizontal distribution steel bars 42, second corner angle steel 43, and second shear-resistant members 44; further, the second shear-resistant members 44 in two adjacent intermediate prefabricated shock-absorbing partition boards 4 are welded to each other.

[0072] It should be noted that to avoid serious damage to the bottom of the partition board due to stress concentration under bidirectional seismic action, the present invention installs the first corner angle steel 23 and the second corner angle steel 63 on the bottom edges of both sides of the side prefabricated shock-absorbing partition board 2 and the intermediate prefabricated shock-absorbing partition board 4 respectively; at the same time, to avoid the occurrence of interfacial sliding cracks between the wallboards on the partition wall surface, the present invention improves the integrity and damage controllability of the partition wall by setting shear-resistant members in the wallboard and welding the shear-resistant members between adjacent wallboards.

[0073] Furthermore, in order to realize the functions of variable friction and variable damping energy dissipation of the present invention, a friction damping layer 7 is laid between the side assembled shock-absorbing partition board 2, the middle assembled shock-absorbing partition board 4 and the frame bottom beam 12. The friction damping layer 7 can be made of low-strength mortar or other materials with sliding friction energy dissipation function. A horizontal force transmission clip 5 is arranged at the top of the gap between the side assembled shock-absorbing partition board 2 and the left column 13 of the frame, and between the side assembled shock-absorbing partition board 2 and the right column 14 of the frame. The horizontal force transmission clip 5 can be formed by supporting the formwork and pouring high-strength concrete (or high-strength mortar) at the gap. Since the two side walls of the assembled shock-absorbing partition board are in contact with the outer frame only at the top through the horizontal force transmission clip 5, under the action of the horizontal earthquake reciprocating force, the horizontal force transmission clip 5 will push the assembled shock-absorbing partition board to slide with the interlayer deformation of the outer frame 1, but will not cause the bottom of the assembled shock-absorbing partition board to collide or squeeze with the outer frame (the deformation mode can be referred to). Figures 6 to 7 ), thereby achieving the sliding friction energy dissipation of the assembled shock-absorbing partition wall panels. In addition, a notch is provided at the upper corner of the side assembled shock-absorbing partition wall panels 2, and a rubber pad 3 is installed at the notch. The rubber pad 3 is compressed due to the node rotation and interlayer deformation of the outer frame 1, thereby changing the sliding friction of the assembled shock-absorbing partition wall panels under the push of the horizontal force transmission card 5, and achieving the functions of variable friction and variable damping energy dissipation under earthquake. Considering that the structure is usually subjected to bidirectional force when subjected to earthquake, the present invention allows the assembled shock-absorbing partition wall with variable friction energy dissipation to have a certain degree of warping at the bottom. Please refer to Figure 10 , the rubber pad 3 includes an upper sealing plate 31, rubber 32 and a lower sealing plate 33 from top to bottom. A protrusion 34 is provided on the top of the upper sealing plate 31, and the protrusion 34 contacts the bottom surface of the frame top beam 11. The lower sealing plate 33 and the incision can be reliably connected by epoxy resin glue or other means. Based on the principle that the stiffness of the rubber pad 3 is controllable and designable, the rubber pad 3 should be uniformly compressed as much as possible under stress. Therefore, a protrusion 34 is provided on the top of the upper sealing plate 31, and the stiffness of the upper sealing plate 31 is appropriately increased (which can be achieved by increasing the thickness of the upper sealing plate 31). Furthermore, since the protrusion 34 is in contact with the bottom of the frame top beam 11 in a small range, under the in-plane load or the coupling of in-plane and out-of-plane loads, the structure provided by the present invention can avoid the rotation of the upper sealing plate 31 to the greatest extent, so that the rubber 32 is always in a state of approximately uniform compression.

[0074] Combine the following Figures 5 to 8, this embodiment further explains the working mechanism of the present invention to achieve variable friction energy dissipation. Under the action of horizontal seismic reciprocating force, the frame beam-column joint 15 will translate and rotate. The translation of the frame beam-column joint 15 will drive the horizontal force transfer clip 5 to push the partition wall panel to undergo frictional sliding; the rotation of the frame beam-column joint 15 will cause the rubber pad 3 to undergo compressive deformation, and the compressive deformation will further cause the partition wall panel to be compressed, so that the normal force of the bottom friction surface of the partition wall panel increases with the increase of the inter-story displacement and the joint rotation, and thus the higher the seismic intensity, the greater the friction energy dissipation provided by the partition wall panel can be achieved.

[0075] Embodiment 2

[0076] This embodiment discloses a construction method for an assembled shock-absorbing partition wall-frame structure with variable friction energy dissipation. Before installing the assembled shock-absorbing partition wall panel, the construction of the peripheral frame 1 should be completed first, and the sundries on the frame top beam 11, frame bottom beam 12, frame left column 13, and frame right column 14 should be cleared; then, according to the construction drawings, use a ink line (or other tools) to mark the installation position line at the partition wall installation position.

[0077] The construction method for the assembled shock-absorbing partition wall-frame structure with variable friction energy dissipation includes the following steps:

[0078] Step 1:

[0079] According to the partition wall installation position line, first position and install the side assembled shock-absorbing partition wall panel 2. During positioning, insert a wooden wedge at the bottom of the side assembled shock-absorbing partition wall panel 2, and use tools such as a crowbar to adjust the height of the wall panel so that the top protrusion 34 of the rubber pad 3 contacts the bottom surface of the lower flange of the frame top beam 11; after accurate positioning, install the angle steel restraint around the side assembled shock-absorbing partition wall panel 2 to ensure reliable out-of-plane stability of the partition wall panel.

[0080] Step 2:

[0081] Install several intermediate assembled shock-absorbing partition wall panels 4. During installation, repeat Step 1 without considering the position and contact relationship between the rubber pad 3 and the frame top beam 11.

[0082] Step 3:

[0083] Fine-tune the side assembled shock-absorbing partition wall panel 2 and the intermediate assembled shock-absorbing partition wall panel 4 until the shear-resistant parts (the first shear-resistant part and the second shear-resistant part) of the partition wall panel splicing surface are in good fit, and at this time, weld the shear-resistant parts of the splicing surface to complete the reliable connection between the partition wall panels of the assembled shock-absorbing partition wall.

[0084] Step 4:

[0085] Fill the friction damping layer 7 of low-strength mortar in the bottom gap (propped up by wooden wedges) between the side assembled shock-absorbing partition wall panel 2 and the middle assembled shock-absorbing partition wall panel 4. When filling, try to make the friction damping layer 7 of low-strength mortar uniform and complete in the gap. After the low-strength mortar sets and hardens, pull out the bottom wooden wedges and fill the holes left by the wooden wedges with low-strength mortar. Further, form a horizontal force transfer clip 5 by formwork and pouring high-strength concrete (or high-strength mortar) in the upper gap between the side assembled shock-absorbing partition wall panel 2 and the frame column.

[0086] Step 5:

[0087] For other voids between the assembled shock-absorbing partition wall with variable friction energy dissipation and the peripheral frame, appropriate flexible connection materials can be used for filling and caulking according to requirements such as thermal insulation, moisture-proof, and sound insulation.

[0088] Example 3

[0089] To further demonstrate the beneficial effects and feasibility of the present invention, this example is based on Figure 5 With the structure appropriately simplified, a finite element numerical modeling analysis was carried out on the assembled shock-absorbing partition wall with variable friction energy dissipation.

[0090] 1. Specimen design

[0091] The sample specimen is the assembled shock-absorbing partition wall-frame structure with variable friction energy dissipation described in Example 1 above. The control specimen is a peripheral frame with the same dimensions as those in Example 1 above, but the partition wall does not have the function of variable friction energy dissipation. The specific structure of this partition wall is similar to the prior art solution (patent number: 202210367123.3) and is a constant friction shock-absorbing wall panel. In both specimens, the gaps between the partition wall and the left frame column 13, the right frame column 14, and the top frame beam 11 are set to 50 mm, 50 mm, and 50 mm respectively. The left frame column 13 and the right frame column 14 are Q355-B welded box columns with a cross-sectional size of 300×300×14×14 mm, and the top frame beam 11 and the bottom frame beam 12 are made of Q235-B hot-rolled H-shaped steel with a cross-sectional size of 400×200×8×13 mm. The structural design meets requirements such as strong columns and weak beams, the slenderness ratio limit of columns, and the seismic checking calculation of beam-column joints.

[0092] 2. Construction of finite element numerical model

[0093] According to the actual size and detailed structure of the sample specimen, the general finite element software ABAQUS was used to construct the finite element numerical models of the sample specimen and the control specimen respectively according to the conventional method. Among them, the finite element model of the sample specimen is as Figure 12 shown, and the finite element model of the control specimen is as Figure 13 shown.

[0094] The following is for the construction of Figure 12 andFigure 13 Briefly describe the key points of the finite element model shown.

[0095] 2.1 Peripheral frame

[0096] The peripheral frame based on steel structure is modeled by three-dimensional solid element C3D8R, and the frame beams and columns are connected by Tie constraint. The constitutive model of steel adopts bilinear kinematic hardening model, the elastic modulus E is taken as 206000MPa, and the second stiffness E t is taken as 0.02E, and the Poisson's ratio is taken as 0.28. For Q235 steel, the yield strength is taken as 270MPa and the ultimate strength is taken as 425MPa; for Q355 steel, the yield strength is taken as 379MPa and the ultimate strength is taken as 517MPa.

[0097] 2.2 Prefabricated shock-absorbing partition wall panels

[0098] The prefabricated shock-absorbing partition wall panels in this embodiment are modeled by three-dimensional solid element C3D8R and are made of autoclaved aerated concrete materials. Therefore, the constitutive model of the partition wall is calculated according to the constitutive model of autoclaved aerated concrete recommended by Guo Zhenhai, and the damage factor is calculated by the energy method. The elastic modulus is taken as 2000MPa and the Poisson's ratio is taken as 0.2. For compression, it can be calculated according to formulas (1) and (2), and for tension, it can be calculated according to formulas (3) and (4).

[0099] Constitutive model for compression:

[0100] When ε c / ε c0 <1, σ c / f c =1.1(ε c / ε c0 )-0.1(ε c / ε c0 ) 2 (1)

[0101] When ε c / ε c0 <1, σ c / f c =(ε c / ε c0 ) / [a(ε c / ε c0 -1) 2 +(ε c / ε c0 )] (2)

[0102] In formulas (1) and (2), σ c and ε c are the compressive stress and compressive strain of autoclaved aerated concrete respectively; f c is the peak compressive stress, taken as 3.5MPa; εc0 is the peak compressive strain, taking 0.002; a is the adjustment coefficient, and the value range is 2.5 - 5.0.

[0103] Tensile constitutive relation:

[0104] ε tu = 15ε t0 (3)

[0105] f tu = 0.1f t (4)

[0106] In Equations (3) and (4), ε tu is the ultimate tensile strain of autoclaved aerated concrete; ε t0 is the peak tensile strain of autoclaved aerated concrete, taking 0.0001; f tu is the tensile strength corresponding to the ultimate tensile strain, f t is the peak tensile strength corresponding to the peak tensile strain.

[0107] The steel bars in the partition wall are modeled using the truss element T3D2. HPB300 steel bars with a diameter of 6 mm are selected. The elastic modulus is taken as 206000 MPa, the Poisson's ratio is taken as 0.3, the yield strength is taken as 300 MPa, the ultimate strength is taken as 420 MPa, and the corresponding plastic strain is taken as 0.057. The constraint relationship between the steel bars and the partition wall is established through the Embedded command. In addition, referring to the modeling method of the existing technical solution, the friction damping layer 7 between the prefabricated shock-absorbing partition wall panel and the frame bottom beam 12 is simplified in modeling. Its interface normal behavior is defined as hard contact, and the tangential behavior is defined as frictional contact, and the friction coefficient is taken as 0.7.

[0108] 2.3 Rubber pad

[0109] The rubber pad 3 in this embodiment is designed with reference to "Rubber Bearings - Part 3: Isolation Rubber Bearings for Buildings" (GB20688.3 - 2006). The vertical stiffness of the rubber pad 3 is taken as 10 kN / mm. To improve the convergence and calculation efficiency of the finite element numerical calculation, the rubber pad 3 is simplified in modeling in the model. The rubber 32 is equivalent to a linear spring with a stiffness of 10 kN / mm, and the spring is connected to the rigid upper sealing plate 31 and the rigid lower sealing plate 33. For the contact relationship, the protrusion 34 and the bottom of the frame top beam 11 are in hard contact, and the lower sealing plate 33 and the side prefabricated shock-absorbing partition wall panel 2 are in Tie constraint.

[0110] 2.4 Other components

[0111] Except for the components described in 2.1, 2.2, and 2.3, other components in this embodiment (such as shear-resistant members, angle steels for corner wrapping, angle steel restraint members, etc.) are given material properties according to the constitutive relationship of Q235 steel. The horizontal force transfer clip 5 is defined with material properties according to C80 concrete in the "Code for Design of Concrete Structures" (GB50010 - 2002).

[0112] 2.5 Supplementary Explanation and Loading

[0113] The contact relationships not described above are defined and simplified according to the actual contact behavior. The most significant feature of the sample specimen and the control specimen is whether variable friction energy dissipation can be achieved. During finite element numerical calculation, the loading of the sample specimen and the control specimen is achieved in two analysis steps: The first analysis step is to apply a gravity load to the partition wall; the second analysis step is to apply a horizontal reciprocating load to the tops of the left frame column 13 and the right frame column 14.

[0114] 3. Test Results

[0115] Under the action of the horizontal reciprocating load, the friction force - displacement curve of the constant friction damping partition wall of the existing technical solution is a flat rectangle, with a relatively small hysteresis area and relatively limited energy dissipation capacity, as Figure 4 shown. However, the friction force - displacement curve of the assembled damping partition wall with variable friction energy dissipation provided by the present invention is in a butterfly shape (see Figure 14 ), the curve is more symmetrical and full, and the friction force increases with the increase of the interlayer displacement. Therefore, its hysteresis area is relatively larger and its energy dissipation capacity is higher, and it can provide a relatively high additional damping ratio for the structure and reduce the seismic action.

[0116] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made without creative efforts by those skilled in the art are still within the protection scope of the present invention.

Claims

1. An assembled shock-absorbing partition-wall frame structure with variable friction energy dissipation, characterized in that It includes a peripheral frame (1), a prefabricated shock-absorbing partition wall panel with variable friction energy dissipation function arranged inside the peripheral frame (1), shear connectors, rubber pads (3), horizontal force transfer clips (5), angle steel restraint members (6), and a friction shock-absorbing layer (7). The prefabricated shock-absorbing partition wall panel includes two side prefabricated shock-absorbing partition wall panels (2) and a plurality of intermediate prefabricated shock-absorbing partition wall panels (4) located between the two side prefabricated shock-absorbing partition wall panels (2). Shear connectors are arranged between the side prefabricated shock-absorbing partition wall panel (2) and the intermediate prefabricated shock-absorbing partition wall panel (4), and between adjacent intermediate prefabricated shock-absorbing partition wall panels (4). The adjacent shear connectors are closely attached and reliably connected. The rubber pad (3) is arranged between the top of the side prefabricated shock-absorbing partition wall panel (2) and the peripheral frame (1), and the horizontal force transfer clip (5) is arranged in the gap between the top side wall and the peripheral frame (1). The horizontal force transfer clip (5) is made of high-strength concrete or high-strength mortar. The angle steel restraint member (6) is arranged between the prefabricated shock-absorbing partition wall panel and the peripheral frame (1) to form a reliable out-of-plane restraint. The friction shock-absorbing layer (7) is arranged at the bottom of the prefabricated shock-absorbing partition wall panel. Among them, a notch is arranged at the upper side corner of the side prefabricated shock-absorbing partition wall panel (2), and the rubber pad (3) is arranged at the notch. The rubber pad (3) includes an upper sealing plate (31), a lower sealing plate (33), and rubber (32) located between the upper sealing plate (31) and the lower sealing plate (33). The lower sealing plate (33) is located at the notch, and a protrusion (34) is arranged at the top of the upper sealing plate (31), and the protrusion (34) contacts the peripheral frame (1).

2. The prefabricated shock-absorbing partition wall-frame structure with variable friction energy dissipation according to claim 1, characterized in that, Each side prefabricated shock-absorbing partition wall panel (2) includes steel bars, a first angle steel for corner wrapping (23) connected to the steel bars, and a first shear connector (24). The first angle steel for corner wrapping (23) is located on both sides of the bottom of the side prefabricated shock-absorbing partition wall panel (2), and the first shear connectors (24) are arranged along both sides of the wall panel height.

3. The prefabricated shock-absorbing partition-wall frame structure with variable friction energy dissipation according to claim 1, characterized in that, Each intermediate prefabricated shock-absorbing partition wall panel (4) includes steel bars, a second angle steel for corner wrapping (43) connected to the steel bars, and a second shear connector (44). The second angle steel for corner wrapping (43) is located on both sides of the bottom of the intermediate prefabricated shock-absorbing partition wall panel (4), and the second shear connectors (44) are arranged along both sides of the wall panel height.

4. A prefabricated shock-absorbing partition wall-frame structure with variable friction energy dissipation according to claim 1, characterized in that, The friction shock-absorbing layer (7) is made of low-strength mortar or other materials with sliding friction energy dissipation function.

5. A prefabricated shock-absorbing partition wall-frame structure with variable friction energy dissipation according to claim 1, characterized in that The horizontal force transfer clip (5) is in a cuboid shape, and the horizontal force transfer clip (5) is formed by casting high-strength concrete or high-strength mortar through formwork support.

6. A prefabricated shock-absorbing partition-wall frame structure with variable friction energy dissipation according to claim 1, characterized in that, Other gaps between the prefabricated shock-absorbing partition wall panel and the peripheral frame (1) are filled with flexible materials.

7. A prefabricated shock-absorbing partition-wall frame structure with variable friction energy dissipation according to claim 1, characterized in that, The lower sealing plate (33) is adhesively fixed at the notch.

8. A construction method of the assembled shock-absorbing partition wall-frame structure with variable friction force energy dissipation according to any one of claims 1-7, characterized in that, It includes the following construction steps: Step 1: Fabricate the prefabricated shock-absorbing partition wall panel in a prefabrication factory and transport it to the construction site. Step 2: Complete the construction of the peripheral frame and position the prefabricated shock-absorbing partition wall panel in the frame. Step 3: Synchronously install the prefabricated shock-absorbing partition wall panel, the friction shock-absorbing layer (7), and the angle steel restraint member (6). Step 4: Install the horizontal force transfer card (5); Step 5: Fill the other gaps between the outer frame and the prefabricated shock-absorbing partition board with flexible materials.

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