Fabricated concrete structure reduced scale model structure suitable for vibration table test

Abstract

The utility model relates to the technical field of concrete reduced-scale models, and discloses a fabricated concrete structure reduced-scale model structure suitable for a vibration table test, which comprises a support base body and a shear wall body, and the support base body provides a support foundation for the shear wall body; the whole shear wall body is subjected to sectional treatment, specifically, the shear wall body is divided into a lower section assembly, an upper section assembly and a sectional construction layer, the whole model is subjected to sectional treatment, and a reduced-scale model method of pouring and combining on site has the remarkable advantages that prefabrication construction is carried out in a processing plant, all parts of the model can be accurately processed in a controlled environment, and the construction efficiency is improved. High quality and high precision are ensured, only pouring and merging need to be carried out on site, the construction process is simplified, the construction period is shortened, the segmented model units are small in size and convenient to transport, the transportation difficulty and high cost of a large overall model are avoided, the segmented transportation mode is flexible, and the method can adapt to different transportation tools and conditions.

Description

Technical Field

[0001] This utility model relates to the field of concrete scale model technology, and in particular to a prefabricated concrete structure scale model structure suitable for shaking table testing. Background Technology

[0002] Shaking table tests on scaled-down models of concrete structures are an important method for studying the seismic performance of building structures. By testing scaled-down models on a shaking table, the dynamic response and failure mechanism of structures under actual earthquake loading can be simulated, providing reliable data support for structural design and seismic performance. Due to the relatively low cost of scaled-down model tests and the intuitive and reliable results, this test method is widely used in the field of structural engineering.

[0003] Currently, the size range of concrete scale-down models is quite wide, ranging from small models to large and complex models. However, due to their large size and weight, medium and large scale-down models face many inconveniences in processing at the test site and construction environment, which is not conducive to the construction of medium and large scale-down models. In addition, the overall transportation of scale-down models is also difficult. Due to the size limitation of the model, special transportation tools are required, which increases logistics costs.

[0004] Therefore, this utility model solves the above problems by providing a scaled-down prefabricated concrete structure model suitable for shaking table testing. Utility Model Content

[0005] The purpose of this invention is to provide a scaled-down model of a prefabricated concrete structure suitable for shaking table testing, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a scaled-down prefabricated concrete structure model suitable for shaking table testing, comprising:

[0007] Supporting base and shear wall, wherein the supporting base provides a supporting foundation for the shear wall;

[0008] The shear wall is segmented as a whole, specifically divided into:

[0009] The lower assembly is cast onto the top of the supporting base;

[0010] The upper assembly is located directly above the lower assembly;

[0011] The segmented construction layer is located between the upper and lower assemblies and is formed by on-site casting to connect the upper and lower assemblies.

[0012] Preferably, shear wall steel reinforcement bundles are evenly distributed at the top of the lower section assembly, and lower anchoring steel bars are reserved at the top of the lower section assembly, while corresponding upper anchoring steel bars are evenly distributed at the bottom of the upper section assembly.

[0013] Preferably, the lower anchoring bar has a length of 30d and is bent at 90 degrees at 1 / 3 of its length; the upper anchoring bar has a length of 30d and is bent at 90 degrees at 1 / 5 of its length; and the upper and lower anchoring bars are arranged opposite each other and correspond one-to-one.

[0014] Preferably, the segmented construction layer includes multiple sets of plate components placed between the upper and lower assemblies, and a concrete layer with a thickness of 3 times that of the plate components is poured into the plate components.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] This invention presents a method for creating a scaled-down model by segmenting the overall model, prefabricating and casting the segments in a factory, transporting them to the test site, and then merging them on-site. This method offers significant advantages. Prefabrication in the factory allows for precise processing of each part of the model under controlled conditions, ensuring high quality and precision. On-site merging simplifies the construction process and shortens the construction cycle. The smaller size of the segmented model units facilitates transportation, avoiding the difficulties and high costs associated with transporting large, integral models. The segmented transportation method is flexible and can adapt to different transportation tools and conditions. The prefabricated segmented construction method reduces the workload and site requirements of on-site construction, making it suitable for various test site conditions. Thickening the casting at the segmentation points restores and ensures the integrity and connection strength of the scaled-down model, ensuring the consistency of the model's mechanical properties and structure during testing. This provides a superior solution for vibration table testing of scaled-down concrete models. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a partial structural diagram of the present invention;

[0019] Figure 3 This is a first-view structural diagram of the lower and upper assembly of the present invention.

[0020] Figure 4 This is a schematic diagram of the second-view structure of the lower section assembly and the upper section assembly of this utility model;

[0021] Figure 5 This is a schematic diagram of the segmented construction layer structure of this utility model.

[0022] In the diagram: 1. Lower assembly; 2. Segmented construction layer; 3. Upper assembly; 4. Shear wall reinforcement bundle; 5. Lower anchorage reinforcement; 6. Upper anchorage reinforcement; 7. Slab member; 8. Supporting base. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] This utility model provides, for example Figures 1 to 5 The illustrated scaled-down model of a prefabricated concrete structure suitable for shaking table testing includes:

[0025] Support base 8 and shear wall, support base 8 provides a supporting foundation for shear wall;

[0026] The shear wall is segmented as a whole, and the nodes are rationally planned according to the height of the shear wall. The segmentation points are selected at the slab component 7 of the structure to achieve the purpose of segmented construction and transportation. At the same time, the construction is reproduced one-to-one according to industry standards and actual construction standards to ensure construction accuracy and facilitate on-site overlapping and assembly, simplifying the process. Since the segmented model units are smaller in size, they are easy to transport to the actual construction site, reducing construction difficulty. Each segmented model unit retains positioning parts (not limited to anchor bars) to improve the positioning accuracy of the segmented model units. Then, the model units are overlapped and assembled one by one to complete the on-site merging of the overall model. Subsequently, the slab component 7 is poured and connected by on-site casting. After the concrete has solidified, the on-site construction of the model can be realized. In this way, the problem of inconvenient on-site construction of medium and large-sized concrete structure scaled models due to the limitation of test site can be solved by using prefabricated segmented construction and on-site merging methods, improving construction efficiency and model accuracy, ensuring the smooth conduct of shaking table tests and the reliability of test results. Specifically, it is divided into:

[0027] The lower assembly 1 is cast on top of the supporting base 8;

[0028] Upper assembly 3 is located directly above lower assembly 1;

[0029] Sectional construction layer 2 is set between the upper assembly 3 and the lower assembly 1, and is formed by on-site casting to connect the upper assembly 3 and the lower assembly 1.

[0030] In the processing plant, the units of the scaled-down concrete structure model—support base 8, lower assembly 1, and upper assembly 3—are prefabricated. This allows the complete structural model to be divided into transportable independent units. The segmentation point between lower assembly 1 and upper assembly 3 is chosen at the position of the slab member 7 of the shear wall. That is, the slab member 7 of the shear wall structure is disconnected. This allows the shear wall to be segmented because the position of slab member 7 is relatively flat and is not a major bending member, thus contributing little to the overall structural stiffness. Therefore, this point is chosen as the segmentation point without affecting the overall shear wall structure, which facilitates segmented construction and subsequent on-site merging. This segmentation method effectively avoids construction difficulties caused by site conditions and ensures that each part of the model can be transported smoothly to the test site.

[0031] Once transported to the site, the on-site assembly of slab components 7 is relatively simple. The multiple disconnected slab components 7 can be restored to their integrity through thickening and pouring. Compared with beam-column connections, the connection and pouring process of slab components 7 is easier to operate, reducing construction difficulty and time. Disconnecting at slab components 7 and performing on-site pouring and merging can ensure the overall rigidity and strength of the model. The thickened slab components 7 after pouring can effectively connect the upper and lower parts, ensuring the stability and consistency of the overall structure. On-site pouring and merging construction at the test site, and thickening the slab components 7, allow the lower assembly 1 and the upper assembly 3 to form a unified scaled model through connection and pouring.

[0032] The top of the lower assembly 1 is evenly distributed with shear wall steel reinforcement bundles 4, and the top of the lower assembly 1 is reserved with lower anchoring steel bars 5. The bottom of the upper assembly 3 is evenly distributed with corresponding upper anchoring steel bars 6. In this way, when the upper assembly 3 and the lower assembly 1 are connected, the positioning and installation of the upper assembly 3 can be achieved by the overlapping of the lower anchoring steel bars 5 and the upper anchoring steel bars 6.

[0033] The lower anchoring rebar 5 has a length of 30d, and is bent at 90 degrees at 1 / 3 of its length. The upper anchoring rebar 6 has a length of 30d, and is bent at 90 degrees at 1 / 5 of its length. The upper anchoring rebar 6 and the lower anchoring rebar 5 are arranged opposite each other and correspond one-to-one. The length of the lower anchoring rebar 5 and the upper anchoring rebar 6 is set to provide sufficient connection length during on-site merging, ensuring that the upper and lower shear walls can be firmly connected. The hook lap splicing method can significantly improve the bond force and connection strength of the rebar connection, improve the tensile and shear resistance of the structure, prevent slippage and pull-out, adapt to on-site construction, and ensure the accuracy of the shaking table test. This rebar lap splicing method can significantly improve the construction efficiency and quality of on-site merging.

[0034] The segmented construction layer 2 includes multiple sets of plate members 7 placed between the upper assembly 3 and the lower assembly 1, and a concrete layer with a thickness of 3 times that of the plate members 7 is poured into them. The plate members 7 are not bending members and have limited contribution to the stiffness of the structure. By appropriately thickening the pouring treatment, the integrity and connection strength of the structure can be guaranteed, while the stiffness of the structure will not be affected, so as not to affect the similarity between the scaled model and the prototype structure.

[0035] In practice, the on-site merging process is as follows:

[0036] S1: First, transport the support base 8, upper assembly 3, lower assembly 1 and casting materials to the test site;

[0037] S2: On site, the lower assembly 1 is first positioned and fixed on the top of the support base 8, and then cast in place to form the lower assembly 1 and the support base 8 into a whole. Then the upper assembly 3 is hoisted above the lower assembly 1. At this time, the upper anchoring steel bar 6 of the upper assembly 3 and the lower anchoring steel bar 5 of the lower assembly 1 are connected by lap splicing. At the same time, the shear wall steel bar bundle 4 is inserted and assembled in the upper assembly 3 to achieve the positioning and installation of the upper assembly 3 on the lower assembly 1.

[0038] S3: After the positioning and connection are completed, plate component 7 is placed and installed between the upper assembly 3 and the lower assembly 1. At the same time, the disconnected plate component 7 can be restored to a whole by thickening and casting in the plate component 7, ensuring the overall rigidity and strength of the model. At the same time, the upper assembly 3 can be directly connected to the lower assembly 1. Compared with beam and column connection, the connection and casting process of plate component 7 is easier to operate, reducing construction difficulty and time. The thickened plate component 7 after casting can ensure the stability and consistency of the overall structure.

[0039] S4: Finally, the completed model is hoisted onto a vibration table for vibration simulation treatment, and the mechanical properties and structural consistency of the model are determined by the vibration parameters.

[0040] After the on-site pouring is completed, it needs to be cured. During the curing period, the shear wall before segmentation should be continuously hoisted and supported. Specifically, after connecting the upper assembly 3 and the lower assembly 1, the upper assembly 3 should be stably supported and fixed using professional hoisting equipment to ensure the stability and integrity of the structure during the curing process. During this period, the hoisting equipment must provide sufficient support to ensure that the structure does not shift or deform under gravity or other external forces. This fixed state should be maintained for at least 7 days. This stage is the critical period for concrete curing. During this period, the concrete gradually hardens and reaches its initial strength. Therefore, during these 7 days, it is necessary to ensure that the structure is in a completely fixed and supported state to prevent any disturbance or stress from affecting the hardening process of the concrete.

[0041] Before conducting the shaking table test, all test preparations were completed. Then, the scaled-down model was placed on the shaking table for vibration testing, and a frequency sweep analysis was performed simultaneously to detect its natural frequency characteristics. The results are shown in the table below:

[0042] Frequency Error Table

[0043]

[0044] Experimental results: The errors between the first and second order frequencies and the theoretical frequencies were controlled within 10%, and the error between the third order frequency and the theoretical frequency was controlled within 5%. The errors between the first few natural frequencies of the model and the theoretical calculation values ​​were all within acceptable ranges. This shows that the model maintained similar dynamic characteristics to the prototype structure well during the manufacturing and assembly process, and was able to truly reflect the dynamic response of the prototype structure in the experiment.

[0045] It is worth noting that after the initial 7-day curing period, the fixing devices can be safely removed. At this point, the concrete has reached sufficient initial strength to maintain its shape and weight. However, even after removing the fixing devices, continuous monitoring and inspection of the structure are still necessary to ensure its stability and safety. After a standard 28-day curing period, the concrete will basically reach its design strength and expected performance indicators. This 28-day curing period is based on the characteristics of concrete materials and relevant standard requirements. During this period, the strength, hardness, and durability of the concrete will be fully developed and demonstrated. A fully cured structure can exhibit true mechanical properties and structural characteristics in shaking table tests. This avoids the influence of human factors on the accuracy of vibration tests of shear wall models, minimizes test errors, and ensures the reliability and accuracy of test results.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A scaled-down model of a prefabricated concrete structure suitable for shaking table testing, characterized in that, include: Support base (8) and shear wall, wherein the support base (8) provides a support foundation for the shear wall; The shear wall is segmented as a whole, specifically divided into: The lower assembly (1) is cast on top of the supporting base (8); The upper assembly (3) is located directly above the lower assembly (1); The segmented construction layer (2) is set between the upper assembly (3) and the lower assembly (1) and is formed by on-site casting to connect the upper assembly (3) and the lower assembly (1).

2. The scaled-down model of a prefabricated concrete structure suitable for shaking table testing as described in claim 1, characterized in that, The lower section assembly (1) has shear wall steel reinforcement bundles (4) evenly distributed on its top, and the lower section assembly (1) has a reserved lower anchoring steel reinforcement (5) on its top, and the upper section assembly (3) has corresponding upper anchoring steel reinforcement (6) evenly distributed at its bottom.

3. The scaled-down prefabricated concrete structure model suitable for shaking table testing according to claim 2, characterized in that, The lower anchoring steel bar (5) has a length of 30d and is bent at 90 degrees at 1 / 3 of its length. The upper anchoring steel bar (6) has a length of 30d and is bent at 90 degrees at 1 / 5 of its length. The upper anchoring steel bar (6) and the lower anchoring steel bar (5) are arranged opposite each other and correspond one-to-one.

4. The scaled-down model structure of prefabricated concrete structure suitable for shaking table testing according to claim 3, characterized in that, The segmented construction layer (2) includes multiple sets of plate components (7) placed between the upper assembly (3) and the lower assembly (1) and a concrete layer with a thickness of 3 times that is poured into the plate components (7).

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