A fabricated recombined bamboo frame-shear wall structure

Abstract

The utility model relates to an assembly type reorganized bamboo frame - shear wall structure belongs to bamboo structure building technical field. The structure includes the frame column of reorganized bamboo, shear wall unit, beam, floor system and foundation. Shear wall unit is formed by the grid -like shear frame of vertical keel and horizontal keel through screw orthogonal connection of staggered arrangement, and the wall panel is fixed in the both sides of framework, frame column and shear wall unit form the stress system of coordination through the rigid connection of bolt, and the anchoring of column foot adopts steel sleeve and opposite -thread bolt and foundation. Horizontal keel staggered arrangement avoids cross section to weaken, and the top keel adopts double -layer structure to enhance the bearing capacity, and the elastic gasket is set up between bottom keel and foundation and buffers earthquake stress. The structure passes through the double defense line design of frame and shear wall, and the interlayer displacement angle is 1 / 53 under 7 degrees rare earthquake through the test verification, and the modular prefabricated component realizes full bolt fast assembly, and the construction efficiency is high, and is applicable to low multilayer low carbon building.

Description

Technical Field

[0001] This invention relates to the field of prefabricated bamboo structure building technology, specifically a prefabricated reconstituted bamboo frame-shear wall structure, suitable for low-rise to multi-story buildings, especially rural revitalization housing and low-carbon public buildings in earthquake-prone areas. Background Technology

[0002] Reconstituted bamboo is an environmentally friendly building material made from bamboo through processing, which can replace traditional wood and steel. Current research on reconstituted bamboo structural systems mainly focuses on shear wall structural systems, whose construction methods are basically based on lightweight wood structural systems, resulting in problems such as complex construction, fixed spatial layout, and limited seismic resistance.

[0003] For example, Chinese patent CN115492247A discloses a novel reconstituted bamboo structure prefabricated building, mainly composed of four square-section columns and wall panels made of bamboo and wood panels. The columns are located at the four corners of the building, with baffles at opposite corners on the inner side, forming trapezoidal cross-section fixing grooves. The wall panels are inserted into the fixing grooves of the columns by fixing blocks with trapezoidal cross-sections at both ends, forming the walls. The roof is a four-sided pyramidal structure, fixed to the top of the columns by limiting pins. The lower end of the columns has detachable barbs for inserting into the ground to increase stability. The internal threaded cylinder and bolt design inside the columns makes the connection more secure and facilitates disassembly. This patent has advantages such as high assembly efficiency, robust structure, environmentally friendly materials, and the ability to be disassembled and reassembled; however, its applicability is limited to simple outdoor buildings, its function is singular, and it lacks insulation and soundproofing design, failing to meet the needs of complex buildings.

[0004] Chinese patent CN213897657U discloses an earthquake-resistant, energy-saving, lightweight timber shear wall, which consists of a timber frame and a veneer panel. The timber frame includes parallel top and bottom beams, which are fixedly connected by several vertically and evenly distributed wall studs. The top and bottom beams and wall studs are all made of SPF lumber and are riveted together with metal nails. Elastic adhesive strips are applied to the front and rear sides of the top and bottom beams and wall studs. The veneer panel is made of OSB lumber and is riveted to the front and rear sides of the timber frame with metal nails, which pass through the veneer panel and elastic adhesive strips sequentially from the outside to the inside into the timber frame. Silicone structural adhesive layers are applied between the top and bottom beams and wall studs and the elastic adhesive strips, as well as between the elastic adhesive strips and the veneer panel, for bonding. This patented design features a highly elastic adhesive strip between the timber frame and the cladding panels. This strip effectively buffers lateral loads on the shear wall, acting as a damper and enhancing its ductility and energy dissipation capacity, thus improving its seismic performance. However, this patented design lacks horizontal bracing and relies solely on the cladding panels for lateral stiffness, making it insufficient to withstand large horizontal loads. Furthermore, the construction requires adhesive layers and the elastic strip, making the process complex, demanding skilled operators, and incurring significant costs.

[0005] Chinese patent CN118686335A discloses a prefabricated assembled reconstituted bamboo shear wall panel and its assembly system. The prefabricated assembled reconstituted bamboo shear wall panel of this invention consists of a first bamboo frame, a front panel, a rear panel, cross braces, a central keel, and an insulation board. The main material is reconstituted bamboo produced by a hot-pressing process. The cross braces and the central keel are perpendicular to each other within the frame, and their joints are connected by mortise and tenon joints and corner brackets. Corner anchors are provided at the bottom. The prefabricated assembled reconstituted bamboo shear wall assembly system is composed of several room-type units, with the aforementioned shear wall panel used for the side walls of each room-type unit. Between adjacent room-type units in the horizontal direction, the top and bottom shear wall panels are connected by protruding portions and slots, respectively. The protruding portions can be serrated and can also be equipped with first prestressing tendons to enhance the connection strength. The cross braces and the central keel are arranged orthogonally, enhancing the overall rigidity and shear resistance. The prestressing tendons improve the stability and load-bearing capacity of the assembly system. However, the invention's cross braces and intermediate keel are connected by mortise and tenon joints and corner brackets, which weakens the cross sections of the cross braces and intermediate keel, thus reducing the load-bearing capacity of the shear wall and decreasing its safety. The corner anchor connections and slot connections require high construction precision and worker skill levels, making on-site construction difficult. If the construction process is not strictly controlled, it can easily lead to quality problems and increase later maintenance costs. The shear wall unit space layout is fixed, with poor planar flexibility, which cannot meet the needs of large spaces and limits the freedom of facade design, thus restricting functional applicability. At the same time, bamboo structures are usually used in low-rise buildings, and the shear wall is dense, resulting in high material usage and cost. The shear wall serves as both a load-bearing and lateral force resisting component, resulting in a single seismic defense line.

[0006] In summary, while existing technologies have achieved some success in assembling reconstituted bamboo and lightweight wood shear wall structures, many shortcomings remain, necessitating further improvement and refinement with new technologies. Compared to shear wall structures, frame-shear wall structures offer advantages such as clear force distribution, flexible spatial layout, high material utilization, good economy, and multiple seismic defenses. Currently, research and application of concrete frame-shear wall and steel frame-shear wall panel systems are mature. A search of relevant patents and literature revealed no research or application of reconstituted bamboo frame-shear wall structures. Therefore, a reconstituted bamboo frame-shear wall structure that combines seismic resistance and ease of construction is urgently needed. Summary of the Invention

[0007] To address the problems of complex construction, fixed spatial layout, and single seismic defense line in existing reconstituted bamboo shear wall structures, this invention provides a fully prefabricated reconstituted bamboo frame-shear wall structure and its design and installation method. Through the coordinated force sharing between the frame and shear wall, the all-bolt / nail connection system, and modular prefabrication assembly technology, it achieves both rigid and flexible seismic performance and efficient construction.

[0008] To solve the above-mentioned technical problems, the technical solution proposed in this application is as follows:

[0009] A prefabricated reconstituted bamboo frame-shear wall structure, comprising: Reconstituted bamboo frame columns, shear wall units, beams, floor systems, and foundations; The shear wall unit includes a frame consisting of vertical keels, horizontally staggered keels, edge sealing keels, top keels and bottom keels, as well as wall panels fixed to both sides of the frame. The vertical keel is set vertically, and the horizontal keel, vertical keel and edge sealing side keel are orthogonally connected by screws to form a grid-like shear-resistant skeleton; The frame columns and shear wall units are rigidly connected by bolts to form a cooperative force-bearing system; The column base of the frame column is equipped with a steel sleeve, and is anchored to the foundation by through bolts that pass through the steel sleeve and the column body.

[0010] Furthermore, the number of screws on one side of the horizontal keel at the connection node with the vertical keel is not less than 2, and the adjacent horizontal keels are staggered in the vertical direction, with a staggered distance not greater than twice the thickness of the horizontal keel.

[0011] Furthermore, the wall panel includes an exterior wall panel and an interior wall panel, and is connected to the frame by rivets; the rivets are evenly distributed at intervals of 200mm to 400mm along the axial direction of the vertical and horizontal keels.

[0012] Furthermore, the top keel has a double-layer structure and is fixed to the top of the vertical keel by double rows of screws.

[0013] Furthermore, the bottom keel is connected to the foundation by anchor bolts, and an elastic gasket is provided between the bottom keel and the foundation.

[0014] Furthermore, reinforcing corner brackets are provided at the connection points between the edge sealing side keel and the top and bottom keels.

[0015] Furthermore, the floor system includes floor beams, cross braces, and floor slabs; the cross braces are connected to the floor beams via angle brackets; the floor slabs are fitted between the top and bottom joists of adjacent shear wall units.

[0016] Furthermore, the beam comprises a frame beam and an edge sealing beam; the frame beam / edge sealing beam is connected to the frame column by steel clamps or steel filler plates and through bolts.

[0017] Furthermore, the shear wall unit has multiple layers of vertical keels on both sides of the door and window openings, and a lintel at the top of the opening is screwed to the vertical keels on both sides.

[0018] Furthermore, the cavity formed by the vertical keel and the horizontal keel is filled with thermal insulation cotton or sound insulation cotton, and the filling material is fixed to the inside of the keel by straps or buckles.

[0019] Compared with existing technologies, the prefabricated reconstituted bamboo frame-shear wall structure of the present invention achieves the following beneficial technical effects: This application utilizes a collaborative design of reconstituted bamboo frames and shear walls to form a dual seismic defense line, significantly improving the overall structural stability. The staggered arrangement of horizontal joists combined with all-nail connection technology effectively transfers horizontal loads, avoiding the section weakening problem of traditional mortise and tenon joints and enhancing shear resistance. Modular prefabricated components enable rapid bolt assembly, reducing construction complexity and reliance on manual labor, and shortening the construction period. The reconstituted bamboo material is low-carbon and environmentally friendly; combined with cavity filling materials, it improves the building's energy efficiency and sound insulation performance. The flexible structural layout can adapt to different functional space requirements, combining economy and sustainability, and is suitable for low-rise to multi-story buildings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall reconstructed bamboo frame-shear wall structure of this application; Figure 2 This is a schematic diagram of the structure of the shear wall unit without openings in this application; Figure 3 This is a schematic diagram of the shear wall unit with openings in this application; Figure 4 This is a schematic diagram showing the connection between the vertical keel, the top keel, and the bottom keel in this application; Figure 5 This is a schematic diagram of the connection between the horizontal and vertical keels in this application; Figure 6 This is a schematic diagram showing the connection between the wall panel and the shear wall frame in this application; Figure 7 This is a schematic diagram of the floor system in this application; Figure 8 This is a schematic diagram of the floor beam connection in this application; Figure 9 This is a schematic diagram of another floor beam connection in this application; Figure 10 This is a schematic diagram of the column base connection in this application; Figure 11 This is a schematic diagram of step one of the installation methods in this application; Figure 12 This is a schematic diagram of step two of the installation method in this application; Figure 13 This is a schematic diagram of step three of the installation method in this application; Figure 14 This is a schematic diagram of step four of the installation method in this application; Figure 15 This is a schematic diagram of step five of the installation method in this application; Figure 16 This is a schematic diagram of step six of the installation method in this application; Figure 17 This is a schematic diagram of step seven of the installation method in this application.

[0022] Reconstituted bamboo frame column-1, steel sleeve-101, through bolt-102, stiffening rib-103, foundation-5, reconstituted bamboo shear wall unit-2, vertical keel-201, horizontal keel-202, edge sealing side keel-203, top keel-204, bottom keel-205, lintel-206, exterior wall panel-207, interior wall panel-208, reconstituted bamboo beam-3, frame beam-31, edge sealing beam-32, reconstituted bamboo floor system-4, floor beam-401, horizontal brace-402, floor panel-403, angle bracket-404. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] See Figure 1 This application discloses a prefabricated reconstituted bamboo frame-shear wall structure, comprising: reconstituted bamboo frame columns 1, reconstituted bamboo shear wall units 2, reconstituted bamboo beams 3, reconstituted bamboo floor system 4, and foundation 5.

[0025] 1. Reconstructed bamboo frame column 1 The column base of the reconstituted bamboo frame column 1 adopts an embedded steel sleeve 101 structure. The inner diameter of the steel sleeve 101 matches the cross section of the reconstituted bamboo frame column 1. The column body is fixed by through bolts 102. Stiffening ribs 103 are welded to the outside of the sleeve to improve shear stiffness.

[0026] The reconstituted bamboo frame column 1 and the reconstituted bamboo shear wall unit 2 are connected by bolts. The column body has pre-drilled bolt holes that are aligned with the bolt holes of the shear wall edge sealing keel 203 to achieve a rigid connection.

[0027] 2. Shear wall unit 2 Shear wall unit 2 comprises a shear wall frame and wall panels. The frame includes vertical joists 201, horizontal joists 202, edge-sealing side joists 203, double-layer top joists 204, bottom joists 205, and lintels 206. The vertical joists 201 and horizontal joists 202 are orthogonally connected by screws, and the horizontal joists 202 are staggered (staggered distance ≤ 2 times thickness) to form a grid-like shear-resistant structure. The inner and outer wall panels 207 and 208 are fixed to the frame by screws, and the joist cavities can be filled with thermal insulation / sound insulation material. Preferably, the vertical joists 201 are spaced 350mm~600mm apart, and the horizontal joists 202 are spaced 500mm~700mm apart. The upper and lower horizontal joists 202 are staggered, with a staggered distance ≤ 2 times the thickness of the horizontal joist 202 (e.g., if the horizontal joist 202 is 50mm thick, the staggered distance ≤ 100mm). Each side has ≥ 2 screw connections to ensure horizontal force transmission. This application enhances the efficiency of horizontal force transmission by staggering the horizontal keel arrangement and connecting it with screws, avoids stress concentration and weakening of the keel cross section, ensures the bearing capacity of the shear wall unit, and improves the reliability of the joint.

[0028] In this application, 2 to 3 layers of vertical keel 201 are provided on both sides of the door and window openings of the shear wall unit 2, which are fixed by horizontal connecting plates. The top lintel 206 is screwed to the vertical keel 201 of the opening to enhance local rigidity.

[0029] In this application, the exterior wall panel 207 and the interior wall panel 208 are fixed with screws, with a screw spacing of 200mm to 400mm. For example... Figure 6 As shown. The rectangular cavity formed between the keel members can be filled with building materials such as thermal insulation cotton or sound insulation cotton to improve the building's thermal insulation and sound insulation performance. All components of the shear wall unit are prefabricated in the factory with pre-drilled bolt holes, facilitating rapid on-site assembly and effectively improving assembly efficiency.

[0030] In this application, the reconstituted bamboo frame column 1 and the shear wall unit 2 are rigidly connected by bolts to form a frame-shear wall collaborative system.

[0031] 3. Reconstructed bamboo beams 3 The reconstituted bamboo beam 3 includes a frame beam 31 and an edge-sealing beam 32. In the building plan layout, the reconstituted bamboo beam 3 is selectively arranged according to the arrangement position of the shear wall unit 2. On the side with shear wall, the reconstituted bamboo floor system 4 is placed on the double-layer top joists 204 of the lower reconstituted bamboo shear wall unit 2, and the floor beam 401 and the edge-sealing side joists 203 are connected by angle brackets 404 and bolts; on the side without shear wall, the floor beam 401 and the reconstituted bamboo beam 3 are connected by angle brackets 404 and bolts.

[0032] 4. Floor System The floor system 4 includes floor beams 401, cross braces 402, and floor panels 403. These are connected to the reconstituted bamboo beams 3 and the top / bottom joists of the shear walls via angle brackets 404, enabling efficient transfer of floor loads. The floor panels 403 are fitted between the top joists 204 and bottom joists 205 of the upper and lower shear walls, and their edges are fixed to the floor beams 401 via angle brackets, forming a continuous load-bearing system.

[0033] This application provides the following design method for this structure: Frame-shear wall structures, as mature structural systems with two lines of defense, have well-established calculation and analysis methods in the fields of concrete and steel structures. The focus of analysis for this type of system is calculating the stiffness of the frame columns and shear wall units to determine the distribution of seismic forces and subsequently calculate component dimensions. However, for reconstituted bamboo shear walls, which are composed of horizontal, vertical, top, and bottom studs, and wall panels connected by bolts / naileds, the stiffness of the entire shear wall unit cannot be calculated using existing formulas. Even if the stiffness of individual studs and wall panels could be calculated, it would be impossible to reasonably combine them together. Therefore, this invention proposes an equivalent stiffness calculation method for shear wall units and provides a design method for reconstituted bamboo frame-shear wall structures.

[0034] Step 1: Based on the actual dimensions and material strength of the shear wall elements, establish a 1:1 shear wall element model in the finite element analysis software, perform static push-over loading, obtain the hysteresis curve of the shear wall element, extract the skeleton curve, and obtain the equivalent stiffness of the shear wall from the skeleton curve using the following formula. K eq，1 The equivalent stiffness of other shear wall elements of different sizes was obtained using the same method. K eq，i ;

[0035] In the formula: ——Equivalent stiffness , —Calculation of the maximum and minimum forces of the equivalent stiffness segment curve of the skeleton curve , —On the skeleton curve , Corresponding displacement value Step 2: A structural model is built using structural design and analysis software. Beams and columns are built according to actual dimensions, and the software directly calculates the stiffness of the reconstructed bamboo columns. Shear wall elements are directly built as shell elements, and the equivalent stiffness of the corresponding shear wall element is directly assigned to the shell. ; Step 3: Apply loads, input parameters of reconstituted bamboo materials and seismic conditions, analyze and design the structure, and adjust the beam and column sections to ensure that the inter-story drift angle, period ratio, deformation and other parameters of the structure meet the relevant requirements. Step 4: If adjusting the beam and column sections in Step 3 still fails to meet the requirements, adjust the shear wall stud arrangement and repeat Steps 1 to 3 until the requirements are met, thus completing the design.

[0036] Currently, there are no specific regulations regarding the analysis parameters and design specifications for reconstituted bamboo frame-shear wall structures. This patent, based on shaking table tests, makes the following suggestions regarding the analysis parameters and design specifications for reconstituted bamboo frame-shear wall structures: 1. The elastic inter-story drift angle of the reconstituted bamboo frame-shear wall structure should be 1 / 250, and the elastic-plastic inter-story drift angle should be 1 / 50.

[0037] 2. The recommended period reduction factor for reconstituted bamboo frame-shear wall structures is 0.9.

[0038] 3. Based on the large-scale shaking table test of the reconstituted bamboo frame-shear wall structure, the minimum damping ratio was measured to be 0.035. Therefore, when performing seismic calculations for the reconstituted bamboo frame-shear wall structure under frequent earthquakes, a structural damping ratio of 0.03 is recommended. 4. Under the action of a specified horizontal force with accidental eccentricity, the ratio of the maximum value to the average value of the elastic horizontal displacement or inter-story displacement of the lateral force resisting members at both ends of the floor should not exceed 1.5.

[0039] Furthermore, the following requirements are put forward for the layout of the reconstituted bamboo frame shear wall: 1. The shear wall units should be arranged evenly, dispersedly and symmetrically in the plane, and should be arranged in both longitudinal and transverse directions. The lateral stiffness in the two directions should not differ too much, and a structural arrangement with walls in one direction should not be adopted. 2. Shear wall units should be arranged continuously along the vertical direction, and door and window openings should be aligned vertically. 3. The upper and lower shear walls should be in the same vertical plane and have reliable connection measures; 4. Holes should not be made at the corners of shear wall units. If it is necessary to make a hole, the width of the corner opening should not be greater than 1m and should not be greater than 1 / 3 of the room size in the corresponding direction. 5. The span of floor beams should not exceed 8m; when connected to shear walls out of plane, they should be supported on the top joists and hinged. 6. The length of an independent wall segment should not be less than 0.6m, and the height-to-width ratio of the wall segment should not be greater than 4; for an outward-extending single-limb shear wall, the outward extension length of the wall without lateral support should not be greater than 1.8m.

[0040] 7. The shear wall units should be arranged evenly, dispersedly, and symmetrically in the plane. The spacing between the supports and shear walls along the length of the building should meet the requirements in the table below. When there are large openings in the floor slab between shear walls, the spacing should be appropriately reduced. Shear wall spacing (m)

[0041] Note: (1) B in the table is the width of the floor slab between shear walls (m); (2) When no shear wall is arranged at the end of the building, the distance between the first shear wall and the end of the building should not be greater than 1 / 2 of the spacing in the table.

[0042] The installation method of this application is further described below with reference to embodiments: Step 1: Frame Column Installation See Figure 11 Insert the reconstituted bamboo frame column 1 into the steel sleeve 101, adjust the verticality, and fix it with through bolts 102. Weld stiffening ribs 103 to the outside of the sleeve to ensure that the column base is rigidly connected.

[0043] Step Two: Foundation Construction See Figure 12 After the reconstituted bamboo frame columns 1 are installed, leveled and aligned, pour the foundation concrete. Note that bolt fixing holes corresponding to the shear wall bottom keel 205 need to be reserved on the foundation.

[0044] Step 3: Installation of the first-floor shear wall See Figure 13 The reconstituted bamboo shear wall unit 2 is hoisted to the foundation, and the bottom keel 205 is fixed to the foundation by pre-embedded bolts. The two sides are bolted to the reconstituted bamboo frame column 1.

[0045] Step 4: Installation of the second-layer reconstituted bamboo beams See Figure 14 It is connected to the frame column 1 by steel clamps / steel filler plates and bolts.

[0046] Step 5: Installation of the second-floor system See Figure 15 On the side with shear wall, the floor panel 403 of the floor system 4 is fitted onto the top keel 204 of the lower shear wall unit 2, and the floor beam 401 is connected to the edge sealing beam 32 by angle brackets 404 and bolts. On the side without shear walls, the floor beam 401 is connected to the frame beam 31 of the reconstituted bamboo beam 3 by angle brackets 404 and bolts.

[0047] Step Six: Install the second-floor shear wall units See Figure 16The second-floor shear wall unit 2 was hoisted into place and connected to the frame columns 1 on both sides using bolts. Then, anchor bolts were used to lock the first-floor top joist 204, the second-floor edge sealing plate, and the second-floor bottom joist 205, thus achieving vertical load transfer. Step Seven: See Figure 17 Repeat steps four through six, installing layer by layer up to the top.

[0048] This application's installation process utilizes all bolt / nail connections, eliminating complex mortise and tenon joinery, simplifying the construction process, and reducing the requirements for construction precision and reliance on worker skills. Furthermore, through modular prefabrication, all components are processed in the factory with pre-drilled bolt holes, enabling rapid on-site assembly. This convenient and efficient construction method simplifies the construction process, reduces construction difficulty, and lowers the requirements for construction precision and worker skill levels. It effectively reduces quality problems caused by high construction difficulty, shortens the construction cycle, and lowers construction costs.

[0049] To better illustrate the seismic performance of this application, and to distinguish it from traditional reconstituted bamboo structures, a shaking table test was specifically conducted for verification. Earthquake shaking table tests, by inputting seismic waves into the shaking table and exciting the structure's response, can effectively reproduce the earthquake process and simulate the failure process of a structure under strong earthquakes. Therefore, shaking table tests are the most direct method for laboratory research on structural seismic response and failure mechanisms, and have become one of the important means of studying and evaluating the seismic performance of structures. Thus, to study the seismic performance and dynamic response of reconstituted bamboo frame-shear wall structures under earthquakes of different intensities, a three-story spatial test model was designed and fabricated at a 1 / 5 scale. Figure 11 The study also conducted simulated earthquake shaking table tests, observed the experimental phenomena, analyzed the experimental data, and determined whether the reconstituted bamboo frame-shear wall structure system was valid, providing key scientific basis for the promotion and application of reconstituted bamboo frame-shear wall structures in my country.

[0050] In the experiment, seismic waves were input sequentially in three directions: unidirectional (X or Y), bidirectional (X-major direction Y-minor direction or Y-major direction X-minor direction), and tridirectional (X-major direction Y-minor direction Z-direction or X-minor direction Y-major direction Z-direction). The input order in each direction was ElCentro wave, Wenchuan wave, and fitted Sichuan artificial wave. The peak ground acceleration ratio for bidirectional input was 1 (major direction): 0.85 (minor direction), and the peak ground acceleration ratio for tridirectional input was 1 (major direction): 0.85 (minor direction): 0.65. The reconstructed bamboo frame-shear wall structure model was subjected to amplitude-modulated peak ground acceleration (AM) tests in the following order: frequent 7-degree earthquakes (35 gal), 7-degree seismic fortification (100 gal), 7.5-degree seismic fortification (160 gal), rare 7-degree earthquakes (220 gal), rare 7.5-degree earthquakes (310 gal), rare 8-degree earthquakes (400 gal), rare 8.5-degree earthquakes (510 gal), rare 9-degree earthquakes (620 gal), extremely rare earthquakes (713 gal), extremely rare earthquakes (820 gal), and extremely rare earthquakes (1000 gal). Shaking table tests were conducted with AM tests at each level, resulting in a total of 146 seismic wave loading tests under various loading conditions.

[0051] After the test, the reconstituted bamboo frame-shear wall structure remained intact, demonstrating good seismic performance during the test. The failure phenomena of the model structure are as follows: Figure 12 As shown, after experiencing earthquakes of varying levels, the structure did not collapse. Major structural components such as beams, columns, and shear walls did not exhibit severe failure or damage. The main damage was concentrated in the shear walls, manifested as cracking of the wall panels and removal of rivets, as well as damage to the horizontal and vertical joist connection nodes. The reconstituted bamboo component connection nodes were reasonably designed and did not show any damage during the test. The experimental failure phenomena are consistent with the failure mode of frame-shear wall structures. The shear walls absorbed most of the seismic energy during the earthquake, fully demonstrating their role as the first line of seismic defense. The all-bolted connection nodes have strong energy dissipation capabilities and effectively protect the structural nodes.

[0052] The displacement of the model in the experiment was measured by displacement gauges. After calculation, it can be seen that under the conditions of a 7-degree frequent earthquake and a 7-degree rare earthquake, the maximum inter-story drift angle in the X direction reaches 1 / 300 and 1 / 53 respectively, and the maximum inter-story drift angle in the Y direction reaches 1 / 290 and 1 / 58 respectively, which meets the requirements of the current relevant specifications.

[0053] Therefore, the test results verify that the reconstructed bamboo frame-shear wall structure system proposed in this application is valid and can be widely promoted and applied in scenarios such as rural revitalization housing and low-carbon public buildings.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A prefabricated reconstituted bamboo frame-shear wall structure, characterized in that, include: The frame columns (1), shear wall units (2), beams (3), floor system (4), and foundation (5) are made of reconstituted bamboo. The shear wall unit (2) includes a frame consisting of vertical keel (201), horizontally staggered keel (202), edge sealing keel (203), top keel (204) and bottom keel (205), and wall panels fixed to both sides of the frame. The vertical keel (201) is set vertically, and the horizontal keel (202) is orthogonally connected with the vertical keel (201) and the edge sealing side keel (203) by screws to form a grid-like shear-resistant skeleton; The frame column (1) and the shear wall unit (2) are rigidly connected by bolts to form a cooperative force-bearing system; The column base of the frame column (1) is provided with a steel sleeve (101) and is anchored to the foundation (5) by through bolts (102) that pass through the steel sleeve (101) and the column body.

2. The structure according to claim 1, characterized in that: The number of screws on one side of the horizontal keel (202) at the connection node with the vertical keel (201) shall not be less than 2, and the adjacent horizontal keels (202) shall be staggered in the vertical direction, with a stagger distance not greater than twice the thickness of the horizontal keel (202).

3. The structure according to claim 1, characterized in that: The wall panel includes an outer wall panel (207) and an inner wall panel (208), and is connected to the frame by rivets; the rivets are evenly distributed at intervals of 200mm to 400mm along the axial direction of the vertical keel (201) and the horizontal keel (202).

4. The structure according to claim 1, characterized in that: The top keel (204) has a double-layer structure and is fixed to the top of the vertical keel (201) by double rows of screws.

5. The structure according to claim 1, characterized in that: The bottom keel (205) is connected to the foundation (5) by anchor bolts, and an elastic gasket is provided between the bottom keel (205) and the foundation (5).

6. The structure according to claim 1, characterized in that: The connection between the edge sealing side keel (203) and the top keel (204) and bottom keel (205) is provided with a reinforcing corner bracket.

7. The structure according to claim 1, characterized in that: The floor system (4) includes floor beams (401), cross braces (402) and floor panels (403); the cross braces (402) are connected to the floor beams (401) via corner brackets (404); the floor panels (403) are fitted between the top joists (204) and bottom joists (205) of the upper and lower adjacent shear wall units (2).

8. The structure according to claim 7, characterized in that: The beam (3) includes a frame beam (31) and an edge sealing beam (32); the frame beam (31) / edge sealing beam (32) is connected to the frame column (1) by steel clamps or steel filler plates and through bolts.

9. The structure according to claim 1, characterized in that: The shear wall unit (2) has multiple layers of vertical keel (201) on both sides of the door and window openings, and a lintel (206) at the top of the openings is screwed to the vertical keel (201) on both sides.

10. The structure according to claim 1, characterized in that: The cavity formed by the vertical keel (201) and the horizontal keel (202) is filled with thermal insulation cotton or sound insulation cotton, and the filling material is fixed to the inside of the keel by straps or buckles.

Images