Method, device and system for detecting and analyzing strength of recombined bamboo building structure

Abstract

The invention relates to the field of material mechanical property detection, in particular to a method, a device and a system for detecting and analyzing structural strength of a recombined bamboo building, and the method comprises the following steps: acquiring spatial distribution and water content characteristic data of a combined structure in the recombined bamboo building to determine a deformation change trend of the building so as to calibrate an abnormal section in the building; and analyzing ultrasonic detection data of the abnormal section to obtain mechanical property characteristics of the abnormal section so as to determine a structural strength anisotropy condition of the abnormal section, and carrying out potential fracture positioning on the building in combination with a load state of the building. According to the method, global non-contact detection can be carried out on the recombined bamboo building in different splicing forms, the structural strength and potential fracture of the recombined bamboo building are efficiently and accurately determined, and a reliable basis is provided for calibrating the mechanical property of the recombined bamboo building.

Description

Technical Field

[0001] The present invention relates to the field of material mechanical property detection, and in particular to a method, device and system for detecting and analyzing the strength of a reconstituted bamboo construction structure. Background Art

[0002] Reconstructed bamboo, a new type of natural fiber-reinforced composite material, is widely used in furniture manufacturing, civil engineering, and other applications. Given its use of bamboo fiber and its rapid growth, reconstructed bamboo can be an effective alternative to wood, reducing market demand for wood and reducing timber harvesting. Reconstructed bamboo exhibits a high degree of randomness in its mechanical properties. Different reconstructed bamboo structures made from the same raw material and using the same production process can exhibit significant variations in structural properties such as flexural strength.

[0003] In order to test the structural strength of reconstructed bamboo structures to meet the needs of reconstructed bamboo structures in different situations, existing technologies have designed methods for testing the bending strength of bamboo materials. For example, invention patent CN119437929A discloses a bamboo bending strength testing device. The device utilizes a downward pressure detection mechanism for testing the bending strength of bamboo materials and an adjustment mechanism that can change the humidity and temperature of bamboo materials to test the bending strength of bamboo materials in different environments, making the test results more comprehensive. However, the above invention patent performs direct contact mechanical testing on bamboo materials, which can only test the bending strength of a single part of the bamboo material at a time and cannot perform all-round strength testing on the bamboo material. The detection efficiency and accuracy are low. Therefore, how to perform global non-contact testing based on the combined splicing structure of reconstructed bamboo is of great significance for quickly and accurately determining the structural strength of reconstructed bamboo structures and predicting potential structural damage such as fractures of reconstructed bamboo structures. Summary of the Invention

[0004] Considering that reconstructed bamboo structures include multiple spliced ​​and pressed components, and the splicing forms of components in different reconstructed bamboo structures vary greatly, in order to perform global non-contact detection on reconstructed bamboo structures with different splicing forms, efficiently and accurately determine the structural strength and potential fracture of the reconstructed bamboo structures, and provide a reliable basis for calibrating the mechanical properties of the reconstructed bamboo structures, the present invention provides a reconstructed bamboo structure strength detection and analysis method, which includes the following steps: S100: Identifying a three-dimensional image of a reconstructed bamboo structure to obtain a spatial distribution of a combined structure within the structure; obtaining water characteristic data of the structure, and determining a deformation trend of the structure based on the spatial distribution of the combined structure and the water characteristic data; S200: Demarcating an abnormal section within the structure according to the deformation change trend; analyzing ultrasonic detection data of the abnormal section to obtain mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section; S300: locating potential fractures of the structure according to the anisotropy of the structural strength and the load state of the structure.

[0005] Preferably, in S100, the three-dimensional image of the reconstructed bamboo structure is identified to obtain the spatial distribution of the combined structure inside the structure, specifically: Acquire three-dimensional images of all outer surfaces of the reconstructed bamboo structure, and splice the three-dimensional images of all outer surfaces according to the relative spatial position relationship of all outer surfaces to form a three-dimensional image of the reconstructed bamboo structure; Identify the pixel texture features of the three-dimensional image of the reconstructed bamboo structure, and obtain the spatial distribution of the splicing gaps of the structure based on the pixel texture features; obtain the spatial distribution of the combined structure inside the structure based on the spatial distribution of the splicing gaps and the external contour of the structure; wherein the spatial distribution of the combined structure includes the size and shape of the splicing surfaces inside the structure.

[0006] Preferably, in S100, water characteristic data of the structure is obtained, and the deformation trend of the structure is determined according to the spatial distribution of the combined structure and the water characteristic data, specifically: Performing infrared light absorption detection on the structure to obtain water content characteristic data of the structure; wherein the water content characteristic data includes spatial distribution data of water content inside the structure; Based on the size and shape of the splicing surface inside the structure and the spatial distribution data of the water content, the deformation change trend of the structural parts on both sides of the splicing surface due to water absorption and expansion is determined; wherein, the deformation change trend includes the twisting deformation moment change trend between the structural parts on both sides of the splicing surface.

[0007] Preferably, in S200, the abnormal section inside the structure is calibrated according to the deformation change trend; the ultrasonic detection data of the abnormal section is analyzed to obtain the mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section, specifically: According to the variation trend of the twisting deformation moment between the construction parts on both sides of the splicing surface, it is judged whether the twisting deformation moment will destroy the bonding between the construction parts on both sides, so as to mark the abnormal section inside the structure; Ultrasonic wave velocity data of the abnormal section is extracted from the ultrasonic detection data of the abnormal section, and the ultrasonic wave velocity data is fitted to obtain the bending strength distribution data of the abnormal section; the bending strength of the bending strength distribution data in two different characteristic directions is extracted and analyzed to determine the structural strength anisotropy of the abnormal section; wherein the structural strength anisotropy includes the difference in the bending strength of the abnormal section in two different characteristic directions.

[0008] Preferably, in S300, the potential fracture location of the structure is performed according to the anisotropy of the structural strength and the load state of the structure, specifically: Extracting the load distribution actually borne by the abnormal section in two characteristic directions from the load condition of the structure; Comparing the structural strength anisotropy with the load distribution actually borne by the abnormal section in the two characteristic directions, the overload bearing effects of the abnormal section in the two characteristic directions are obtained; According to the difference between the overload bearing effects of the abnormal section in two characteristic directions, it is determined whether the abnormal section is a potential fracture occurrence section.

[0009] In another aspect, the present invention provides a device for detecting and analyzing the strength of a reconstituted bamboo structure, the device comprising the following modules: An image recognition module is used to recognize the three-dimensional image of the reconstructed bamboo structure and obtain the spatial distribution of the combined structure inside the structure; a construction deformation trend determination module, configured to obtain water-containing characteristic data of the construction, and determine a deformation trend of the construction based on the spatial distribution of the combined structure and the water-containing characteristic data; An abnormal section marking module, used for marking abnormal sections inside the structure according to the deformation change trend; a strength anisotropy determination module, configured to analyze ultrasonic detection data of the abnormal section to obtain mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section; The potential fracture location module is used to locate the potential fracture of the structure according to the anisotropy of the structural strength and the load state of the structure.

[0010] Preferably, the image recognition module is used to recognize the three-dimensional image of the reconstructed bamboo structure to obtain the spatial distribution of the combined structure inside the structure, specifically: Acquire three-dimensional images of all outer surfaces of the reconstructed bamboo structure, and splice the three-dimensional images of all outer surfaces according to the relative spatial position relationship of all outer surfaces to form a three-dimensional image of the reconstructed bamboo structure; Identifying pixel texture features of the three-dimensional image of the reconstructed bamboo structure, and obtaining a spatial distribution of joint gaps in the structure based on the pixel texture features; obtaining a spatial distribution of the combined structure within the structure based on the spatial distribution of the joint gaps and the external contour of the structure; wherein the spatial distribution of the combined structure includes the size and shape of the joint surfaces within the structure; The structure deformation trend determination module is used to obtain water-containing characteristic data of the structure, and determine the deformation trend of the structure according to the spatial distribution of the combined structure and the water-containing characteristic data, specifically: Performing infrared light absorption detection on the structure to obtain water content characteristic data of the structure; wherein the water content characteristic data includes spatial distribution data of water content inside the structure; Based on the size and shape of the splicing surface inside the structure and the spatial distribution data of the water content, the deformation change trend of the structural parts on both sides of the splicing surface due to water absorption and expansion is determined; wherein, the deformation change trend includes the twisting deformation moment change trend between the structural parts on both sides of the splicing surface.

[0011] Preferably, the abnormal section calibration module is used to calibrate the abnormal section inside the structure according to the deformation change trend, specifically: According to the variation trend of the twisting deformation moment between the construction parts on both sides of the splicing surface, it is judged whether the twisting deformation moment will destroy the bonding between the construction parts on both sides, so as to mark the abnormal section inside the structure; The strength anisotropy determination module is used to analyze the ultrasonic detection data of the abnormal section to obtain the mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section, specifically: Ultrasonic wave velocity data of the abnormal section is extracted from the ultrasonic detection data of the abnormal section, and the ultrasonic wave velocity data is fitted to obtain the bending strength distribution data of the abnormal section; the bending strength of the bending strength distribution data in two different characteristic directions is extracted and analyzed to determine the structural strength anisotropy of the abnormal section; wherein the structural strength anisotropy includes the difference in the bending strength of the abnormal section in two different characteristic directions.

[0012] Preferably, the potential fracture location module is used to locate the potential fracture of the structure according to the anisotropy of the structural strength and the load state of the structure, specifically: Extracting the load distribution actually borne by the abnormal section in two characteristic directions from the load condition of the structure; Comparing the structural strength anisotropy with the load distribution actually borne by the abnormal section in the two characteristic directions, the overload bearing effects of the abnormal section in the two characteristic directions are obtained; According to the difference between the overload bearing effects of the abnormal section in two characteristic directions, it is determined whether the abnormal section is a potential fracture occurrence section.

[0013] In another aspect, the present invention provides a system for detecting and analyzing the strength of a reconstituted bamboo structure, the system comprising: Image acquisition equipment, used to capture three-dimensional images of the reconstructed bamboo structure; Infrared detection equipment, used to perform infrared light absorption detection on the reconstructed bamboo structure to obtain water content characteristic data of the structure; The above-mentioned reorganized bamboo structure strength detection and analysis device is signal-connected to the image acquisition device and the infrared detection device.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Identify the three-dimensional image of the reconstructed bamboo structure to obtain the spatial distribution of the combined structure within the structure; obtain the water content characteristic data of the structure, and determine the deformation change trend of the structure based on the combined structure spatial distribution and water content characteristic data. By identifying all the splicing gaps on the reconstructed bamboo structure and the external contours of the structure itself, the size and shape of all the splicing surfaces within the structure can be obtained, and the combined splicing contact surfaces of all the reconstructed bamboo units within the structure can be accurately quantified and located, providing an accurate basis for subsequently determining the degree of deformation caused by the difference in water absorption and expansion between two adjacent reconstructed bamboo units. Based on the spatial distribution of the combined structure and the water content characteristic data, accurately determine the change trend of the magnitude of the torsional deformation torque formed between the two reconstructed bamboo units, providing an accurate basis for subsequently calibrating abnormal sections within the reconstructed bamboo structure.

[0015] Based on the deformation trend, abnormal sections within the structure are calibrated; ultrasonic test data of the abnormal sections are analyzed to obtain the mechanical performance characteristics of the abnormal sections, thereby determining the anisotropy of the structural strength of the abnormal sections. Under the action of the torsional deformation torque, the original regular combination and splicing state becomes a disordered combination and splicing state, thereby affecting the tightness of the connection between the two adjacent reconstructed bamboo units. Ultrasonic wave velocity testing is performed on the above-mentioned abnormal sections to obtain the relationship between the bending strength of the abnormal sections and the ultrasonic wave velocity. The bending strength of the abnormal sections in the two different characteristic directions, the longitudinal direction and the transverse direction, is extracted and analyzed, thereby determining the difference in the bending strength of the above-mentioned abnormal sections in the longitudinal and transverse directions, providing an accurate basis for the subsequent location of potential fractures in the reconstructed bamboo structure.

[0016] Based on the anisotropy of the structural strength and the load state of the structure, the potential fracture of the structure is located. By comparing the structural strength anisotropy and the load state of the reconstructed bamboo structure in this way, the structural strength and potential fracture of the reconstructed bamboo structure can be determined efficiently and accurately, providing a reliable basis for calibrating the mechanical properties of the reconstructed bamboo structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them:

[0018] Figure 1 The present invention provides a flow chart of a method for detecting and analyzing the strength of a reconstituted bamboo structure.

[0019] Figure 2 It is a combined splicing structure of two different recombined bamboo structures.

[0020] Figure 3 It is the relationship between moisture content and expansion rate of reconstructed bamboo structure.

[0021] Figure 4 It is the relationship curve between the torsional deformation torque formed between two reconstructed bamboo units and the difference in water absorption expansion rate.

[0022] Figure 5 This is a cross-sectional end-face morphology of the reconstructed bamboo structure before and after it absorbs water and expands and twists.

[0023] Figure 6 It is a fitting curve of flexural strength obtained based on ultrasonic wave velocity data.

[0024] Figure 7 It is a structural diagram of a reconstituted bamboo construction structure strength detection and analysis device provided by the present invention.

[0025] Figure 8 This is a structural diagram of a recombinant bamboo construction structure strength detection and analysis system provided by the present invention. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] The terms "comprise," "comprising," and "having," and any variations thereof, as used herein, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0028] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] See also Figure 1 As shown, the present invention provides a method for detecting and analyzing the strength of a reconstituted bamboo structure, the method comprising the following steps: S100: Identify the three-dimensional image of the reorganized bamboo structure to obtain the spatial distribution of the combined structure inside the structure; obtain water characteristic data of the structure, and determine the deformation trend of the structure based on the spatial distribution of the combined structure and the water characteristic data.

[0030] Furthermore, in S100, the three-dimensional image of the reconstructed bamboo structure is identified to obtain the spatial distribution of the combined structure inside the structure, specifically: Acquire three-dimensional images of all outer surfaces of the reconstructed bamboo structure, and splice the three-dimensional images of all outer surfaces according to the relative spatial position relationship of all outer surfaces to form a three-dimensional image of the reconstructed bamboo structure; The pixel texture features of the three-dimensional image of the reconstructed bamboo structure are identified, and the spatial distribution of the splicing gaps of the structure is obtained based on the pixel texture features. The spatial distribution of the combined structure inside the structure is obtained based on the spatial distribution of the splicing gaps and the external contour of the structure. The spatial distribution of the combined structure includes the size and shape of the splicing surfaces inside the structure.

[0031] The preparation process of reconstructed bamboo structure mainly includes the splitting, debonding, drying, impregnation and secondary drying of raw bamboo materials to obtain reconstructed bamboo units, and the longitudinal and transverse assembly, hot pressing and trimming of the reconstructed bamboo units to obtain the corresponding combined splicing structure. Figure 2 , providing two different combination and splicing structures of reconstructed bamboo structures. Among them, Figure 2 (a) is a reconstructed bamboo structure with an overall polyhedral structure, in which multiple reconstructed bamboo units are assembled and spliced ​​into a columnar structure by enclosing from the inside out; Figure 2(b) is a reconstructed bamboo structure with an overall flat-plate structure, which consists of multiple reconstructed bamboo units spliced ​​sequentially along a single direction into a thin plate-like structure. In both of the above reconstructed bamboo structures, the contact surface between any two adjacent reconstructed bamboo units is considered a splicing surface within the reconstructed bamboo structure. In the reconstructed bamboo structure, each reconstructed bamboo unit can be regarded as a relatively independent structural unit. Considering the water absorption properties of bamboo fibers, each reconstructed bamboo unit will absorb moisture from the air when the reconstructed bamboo structure is exposed to the external environment. When the reconstructed bamboo unit absorbs water, it will expand. This expansion is multi-dimensional, mainly expanding and expanding in the longitudinal and transverse directions of the reconstructed bamboo unit. The water absorption rate of different reconstructed bamboo units is different. Generally speaking, the water absorption rate of reconstructed bamboo units in the outer layer of the reconstructed bamboo structure (reconstructed bamboo units with a larger contact area with the external environment) is higher, while the water absorption rate of reconstructed bamboo units in the inner layer of the reconstructed bamboo structure (reconstructed bamboo units with a smaller contact area with the external environment) is lower. The difference in water absorption rate of different reconstructed bamboo units will lead to different water absorption and expansion in different parts of the reconstructed bamboo structure, causing the reconstructed bamboo structure to deform.

[0032] The deformation of the above structure depends on the size and shape of the joint surface of adjacent recombinant bamboo units. In order to accurately determine the physical state of the joint contact between all recombinant bamboo units inside the recombinant bamboo structure, firstly, all the outer surfaces of the recombinant bamboo structure (such as Figure 2 All outer surfaces of the columnar structure in (a), including but not limited to side surfaces and end surfaces, are photographed in three dimensions to obtain three-dimensional images of all outer surfaces. Then, based on the spatial adjacent positional relationships between all outer surfaces, the three-dimensional images of all outer surfaces are correspondingly spliced ​​together to form a three-dimensional image of the entire reconstructed bamboo structure. The three-dimensional image of the entire reconstructed bamboo structure comprehensively reflects the combined splicing structural relationship of all reconstructed bamboo units. Figure 2As shown in (a), adjacent reconstructed bamboo units form corresponding joints on their side and / or end surfaces. These joints are clearly distinct in shape and size from the fiber structure texture on the reconstructed bamboo unit surfaces. Furthermore, the location, shape, and size of these joints are correlated with the size and shape of the joint surfaces between the two adjacent reconstructed bamboo units. By identifying all joints in the reconstructed bamboo structure and the structure's own contours, the size and shape of all joint surfaces within the structure can be determined. Specifically, pixel texture features of the three-dimensional image of the reconstructed bamboo structure are identified. Based on these pixel texture features, the spatial distribution of all joints in the structure is determined. This spatial distribution may include, but is not limited to, the size, extension path, and corresponding location on the side or end surfaces of each joint. Based on the spatial distribution of all joints in the structure and the structure's own contours, the size and shape of all joint surfaces within the structure are determined. This allows for the accurate quantitative location of the combined joint contact surfaces of all reconstructed bamboo units within the structure, providing an accurate basis for subsequently determining the degree of deformation caused by differential water absorption and expansion between adjacent reconstructed bamboo units.

[0033] Furthermore, in S100, water-bearing characteristic data of the structure is obtained, and the deformation trend of the structure is determined according to the spatial distribution of the combined structure and the water-bearing characteristic data, specifically: Conduct infrared light absorption detection on the structure to obtain water content characteristic data of the structure; wherein the water content characteristic data includes spatial distribution data of water content within the structure; Based on the size and shape of the splicing surface inside the structure and the spatial distribution data of the moisture content, the deformation change trend of the structural parts on both sides of the splicing surface due to water absorption and expansion is determined; among them, the deformation change trend includes the change trend of the twisting deformation moment between the structural parts on both sides of the splicing surface.

[0034] The above analysis shows that the reconstructed bamboo unit will expand after absorbing water, and the expansion mainly occurs in the longitudinal and transverse directions of the reconstructed bamboo unit, and the expansion rate of the same reconstructed bamboo unit in the longitudinal and transverse directions is different. In addition, the contact area between different reconstructed bamboo units in the reconstructed bamboo structure and the external environment is different. Among them, the reconstructed bamboo units located in the outermost layer of the reconstructed bamboo structure have a larger contact area with the external environment, and their water absorption rate from the external environment is also larger, while the reconstructed bamboo units located in the inner layer of the reconstructed bamboo structure have a smaller contact area with the external environment, and their water absorption rate from the external environment is also smaller. Specifically, Figure 2In the reconstructed bamboo structure (a), the water absorption rate of different reconstructed bamboo units gradually increases from the inner layer to the outer layer of the structure. When the different reconstructed bamboo units have different expansion rates due to different water absorption rates, they cannot maintain a uniform external expansion change. Some reconstructed bamboo units expand more, while others expand less. This expansion difference between different reconstructed bamboo units, especially the expansion difference between two adjacent reconstructed bamboo units, can cause the entire reconstructed bamboo structure to distort and deform, causing adjacent reconstructed bamboo units to separate within the reconstructed bamboo structure, thereby reducing the overall structural tightness and strength of the reconstructed bamboo structure. To accurately determine the distortion caused by the anisotropic expansion of the reconstructed bamboo structure, it is necessary to first determine the moisture content within the reconstructed bamboo structure. Considering that moisture can absorb infrared light, an infrared beam is projected into the reconstructed bamboo structure. The infrared beam is absorbed by the internal moisture when it passes through the reconstructed bamboo structure, resulting in a decrease in the intensity of the infrared beam emitted from the reconstructed bamboo structure compared to the intensity of the projected infrared beam. The decrease in the infrared beam intensity is positively correlated with the moisture content within the reconstructed bamboo structure. By performing the above-mentioned infrared light absorption test on the reconstructed bamboo structure, the spatial distribution data of the moisture content inside the reconstructed bamboo structure can be obtained, and the moisture content at different spatial positions inside the reconstructed bamboo structure can be quantitatively identified, providing a basis for the subsequent determination of the water absorption and expansion of each reconstructed bamboo unit.

[0035] The size and shape of the joint surface between each reconstructed bamboo unit (i.e., the reconstructed bamboo structure part) and other adjacent reconstructed bamboo units within the reconstructed bamboo structure will affect the water absorption and expansion of the reconstructed bamboo unit itself. Generally speaking, the larger the size of the joint surface between the reconstructed bamboo unit and other adjacent reconstructed bamboo units, the greater its water absorption and expansion rate. Correspondingly, the greater the moisture content of the reconstructed bamboo unit itself, the greater its water absorption and expansion rate. By analyzing the size and shape of the joint surface between the reconstructed bamboo unit and other adjacent reconstructed bamboo units and the (average) moisture content of the reconstructed bamboo unit itself, the deformation change trend caused by water absorption and expansion of different reconstructed bamboo units on both sides of the joint surface can be determined. Specifically, Figure 2 The corresponding relationship between the moisture content and expansion rate of the reconstructed bamboo units located in the outer layer, middle layer, and inner layer of the reconstructed bamboo structure (a) is as follows: Figure 3 As shown above. The infrared absorption test determined that the average moisture contents of the reconstructed bamboo units in the outer, middle, and inner layers of the reconstructed bamboo structure were 16%, 10%, and 5%, respectively. Correspondingly, the expansion rates of the reconstructed bamboo units in the outer, middle, and inner layers differed in the along-grain direction (i.e., the direction parallel to the direction of bamboo fiber extension within the reconstructed bamboo unit) and the transverse direction (i.e., the direction perpendicular to the direction of bamboo fiber extension within the reconstructed bamboo unit). Furthermore, the expansion rates of the same reconstructed bamboo unit itself also differed in the along-grain and transverse directions, with this difference being particularly pronounced for the reconstructed bamboo units in the outer layer.

[0036] Through the above analysis, it can be seen that there are differences in the water absorption expansion rates of different recombinant bamboo units within the recombinant bamboo structure, and there are also differences in the water absorption expansion rates of the same recombinant bamboo unit in the longitudinal and transverse directions. The difference in the water absorption expansion rate will cause the two adjacent recombinant bamboo units (i.e., the construction parts on both sides of the same splicing surface) to twist and deform with each other. This twisting deformation forms a twisting deformation torque between the two recombinant bamboo units. As the difference in the water absorption expansion rate gradually increases, the twisting deformation torque will also tend to increase. The twisting deformation torque formed between the two recombinant bamboo units can be calculated based on the contact surface area of ​​the two recombinant bamboo units (i.e., the splicing surface area) and the twisting deformation amount jointly generated by the two recombinant bamboo units due to the difference in the water absorption expansion rate of the two recombinant bamboo units. A detailed introduction will not be given here. Among them, when the contact surface area of ​​the two recombinant bamboo units remains unchanged, the relationship curve between the twisting deformation torque formed between the two recombinant bamboo units and the difference in the water absorption expansion rate of the two recombinant bamboo units (i.e., the difference corresponding to the average value of the expansion rate of the recombinant bamboo unit itself in the longitudinal and transverse directions) is as shown in the figure. Figure 4 As shown. Figure 4 The relationship curve can accurately determine the changing trend of the twisting deformation torque formed between two reconstructed bamboo units, providing an accurate basis for the subsequent calibration of abnormal sections inside the reconstructed bamboo structure.

[0037] S200: According to the deformation change trend, the abnormal section inside the structure is calibrated; the ultrasonic detection data of the abnormal section is analyzed to obtain the mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section.

[0038] Furthermore, in S200, based on the deformation change trend, the abnormal section inside the structure is calibrated; the ultrasonic detection data of the abnormal section is analyzed to obtain the mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section, specifically: According to the changing trend of the twisting deformation moment between the structural parts on both sides of the splicing surface, it is judged whether the twisting deformation moment will destroy the bonding between the structural parts on both sides, so as to mark the abnormal section inside the structure; Ultrasonic wave velocity data of the abnormal section is extracted from the ultrasonic detection data of the abnormal section, and the ultrasonic wave velocity data is fitted to obtain the bending strength distribution data of the abnormal section; the bending strength of the bending strength distribution data in two different characteristic directions is extracted and analyzed to determine the structural strength anisotropy of the abnormal section; wherein the structural strength anisotropy includes the difference in bending strength of the abnormal section in two different characteristic directions.

[0039] Reconstructed bamboo structures use a hot-pressing process to bond different reconstructed bamboo units together. Any two adjacent reconstructed bamboo units form a corresponding bond at their corresponding contact surfaces (i.e., the splicing surfaces). As the two adjacent reconstructed bamboo units twist and deform, the twisting torque between the two adjacent reconstructed bamboo units will destroy and weaken the above-mentioned bond. Figure 5 , (a) and (b) are the cross-sectional morphologies of the reconstructed bamboo structure before and after it swells and twists due to water absorption. Figure 5 It can be seen that before the reconstructed bamboo structure absorbs water and expands to cause distortion and deformation, all the reconstructed bamboo units in the reconstructed bamboo structure are in a regular combination and splicing state; after the reconstructed bamboo structure absorbs water and expands to cause distortion and deformation, the original regular combination and splicing state becomes a disordered combination and splicing state under the action of the distortion deformation torque, thereby affecting the tightness of the connection between the two adjacent reconstructed bamboo units and may cause the two reconstructed bamboo units to separate. Specifically, from the above Figure 4 Determine the changing trend of the twisting deformation moment between the construction parts on both sides of the splicing surface, and judge whether the twisting deformation moment will exceed the bonding effect between the construction parts on both sides under the current increasing trend. If so, the construction parts on both sides (i.e., two adjacent reconstructed bamboo units) are marked as abnormal sections; otherwise, the construction parts on both sides (i.e., two adjacent reconstructed bamboo units) are not marked as abnormal sections.

[0040] Research has found a linear correlation between the propagation speed of ultrasound within reconstructed bamboo and the bending strength of the reconstructed bamboo. Considering that the abnormal section of the reconstructed bamboo structure has already undergone severe distortion and deformation, it is inevitable that these abnormal sections will first develop structural problems. To this end, it is necessary to prioritize the structural strength (bending strength) of the abnormal section. Specifically, ultrasonic wave velocity testing is performed on the abnormal section to obtain ultrasonic wave propagation velocity data within the abnormal section. This propagation velocity data is then linearly fitted to obtain a linear relationship curve between the bending strength of the abnormal section and the ultrasonic wave velocity. See Figure 6 , according to the ultrasonic wave velocity data, the fitting curve of the bending strength is obtained, that is, the linear relationship curve between the bending strength of the abnormal section and the ultrasonic wave velocity, Figure 6 The function expression of the linear relationship curve is y = 0.26x + 121.35. Based on the linear relationship curve between the bending strength of the abnormal section and the ultrasonic wave velocity, the bending strength of the abnormal section in two different characteristic directions, along the grain and across the grain, was extracted and analyzed. This allowed the difference in bending strength of the abnormal section in the along-grain and across-grain directions to be determined, providing an accurate basis for the subsequent location of potential fractures in the reconstructed bamboo structure.

[0041] S300: Locate potential fractures of structures based on the anisotropy of structural strength and the load conditions of the structure.

[0042] Furthermore, in S300, the potential fracture location of the structure is performed based on the anisotropy of the structural strength and the load state of the structure, specifically: Extract the load distribution actually borne by the abnormal section in two characteristic directions from the load conditions of the structure; By comparing the anisotropic structural strength and the load distribution actually borne by the abnormal section in the two characteristic directions, the overload bearing effect of the abnormal section in the two characteristic directions is obtained. According to the difference between the overload bearing effects of the abnormal section in the two characteristic directions, it is judged whether the abnormal section is a potential fracture occurrence section.

[0043] There are abnormal sections in the reconstructed bamboo structure. The abnormal section may only fracture when the external load borne by the abnormal section meets the corresponding conditions. Specifically, the load weight distribution actually borne by the area where the abnormal section is located in the longitudinal and transverse directions is extracted from the load conditions of the reconstructed bamboo structure, so as to obtain the overload bearing effect of the above-mentioned abnormal section in the longitudinal and transverse directions; wherein, the overload bearing effect refers to the difference between the load weight actually borne by the above-mentioned abnormal section in the longitudinal or transverse directions and the preset load weight threshold. When obtaining the difference between the overload bearing effects of the above-mentioned abnormal section in the longitudinal and transverse directions, if the difference is greater than or equal to the preset difference threshold, it is determined that the above-mentioned abnormal section belongs to the potential fracture section; otherwise, it is determined that the above-mentioned abnormal section belongs to the potential fracture section and does not belong to the potential fracture section, and the structural strength and potential fracture of the reconstructed bamboo structure are determined efficiently and accurately, providing a reliable basis for calibrating the mechanical properties of the reconstructed bamboo structure.

[0044] See also Figure 7 As shown, the present invention provides a structural strength detection and analysis device for reconstructed bamboo structures, which includes the following modules: Image recognition module, used to identify the three-dimensional image of the reconstructed bamboo structure and obtain the spatial distribution of the combined structure inside the structure; The structure deformation trend determination module is used to obtain the water-bearing characteristic data of the structure and determine the deformation trend of the structure based on the spatial distribution of the combined structure and the water-bearing characteristic data; The abnormal section calibration module is used to calibrate the abnormal sections inside the structure according to the deformation change trend; The strength anisotropy determination module is used to analyze the ultrasonic detection data of the abnormal section to obtain the mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section; The potential fracture location module is used to locate the potential fracture of the structure according to the anisotropy of the structural strength and the load state of the structure.

[0045] Furthermore, the image recognition module is used to identify the three-dimensional image of the reconstructed bamboo structure and obtain the spatial distribution of the combined structure inside the structure, specifically: Acquire three-dimensional images of all outer surfaces of the reconstructed bamboo structure, and splice the three-dimensional images of all outer surfaces according to the relative spatial position relationship of all outer surfaces to form a three-dimensional image of the reconstructed bamboo structure; Identify the pixel texture features of the three-dimensional image of the reconstructed bamboo structure, and obtain the spatial distribution of the structure's joint gaps based on the pixel texture features; obtain the spatial distribution of the combined structure within the structure based on the spatial distribution of the joint gaps and the structure's external contours; wherein the combined structure spatial distribution includes the size and shape of the joint surfaces within the structure; The structure deformation trend determination module is used to obtain the water-bearing characteristic data of the structure and determine the deformation trend of the structure based on the spatial distribution of the combined structure and the water-bearing characteristic data. Specifically: Conduct infrared light absorption detection on the structure to obtain water content characteristic data of the structure; wherein the water content characteristic data includes spatial distribution data of water content within the structure; Based on the size and shape of the splicing surface inside the structure and the spatial distribution data of the moisture content, the deformation change trend of the structural parts on both sides of the splicing surface due to water absorption and expansion is determined; among them, the deformation change trend includes the change trend of the twisting deformation moment between the structural parts on both sides of the splicing surface.

[0046] Furthermore, the abnormal section calibration module is used to calibrate the abnormal sections within the structure according to the deformation change trend, specifically: According to the changing trend of the twisting deformation moment between the structural parts on both sides of the splicing surface, it is judged whether the twisting deformation moment will destroy the bonding between the structural parts on both sides, so as to mark the abnormal section inside the structure; The strength anisotropy determination module is used to analyze the ultrasonic detection data of the abnormal section to obtain the mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section, specifically: Ultrasonic wave velocity data of the abnormal section is extracted from the ultrasonic detection data of the abnormal section, and the ultrasonic wave velocity data is fitted to obtain the bending strength distribution data of the abnormal section; the bending strength of the bending strength distribution data in two different characteristic directions is extracted and analyzed to determine the structural strength anisotropy of the abnormal section; wherein the structural strength anisotropy includes the difference in bending strength of the abnormal section in two different characteristic directions.

[0047] Furthermore, the potential fracture location module is used to locate the potential fracture of the structure according to the anisotropy of the structural strength and the load state of the structure. Specifically: Extract the load distribution actually borne by the abnormal section in two characteristic directions from the load conditions of the structure; By comparing the anisotropic structural strength and the load distribution actually borne by the abnormal section in the two characteristic directions, the overload bearing effect of the abnormal section in the two characteristic directions is obtained. According to the difference between the overload bearing effects of the abnormal section in the two characteristic directions, it is judged whether the abnormal section is a potential fracture occurrence section.

[0048] The operation and effects of the reconstituted bamboo structure strength detection and analysis device of the present invention correspond to and are consistent with the above-mentioned reconstituted bamboo structure strength detection and analysis method, and the reconstituted bamboo structure strength detection and analysis device will not be repeated here.

[0049] See also Figure 8 As shown, the present invention provides a reconstituted bamboo construction structure strength detection and analysis system, the system comprising: Image acquisition equipment, used to capture three-dimensional images of the reconstructed bamboo structure; Infrared detection equipment, used to perform infrared light absorption detection on reconstructed bamboo structures to obtain water content characteristic data of the structures; The above-mentioned reorganized bamboo structure strength detection and analysis device is connected to the image acquisition equipment and the infrared detection equipment for signals.

[0050] The image acquisition device can be, but is not limited to, a binocular camera. For reconstructed bamboo structures with specific assembly and splicing structures, the binocular camera can be used to capture three-dimensional images of all exterior surfaces of the reconstructed bamboo structure. These three-dimensional images of all exterior surfaces are then combined and spliced ​​together to form a three-dimensional image of the entire reconstructed bamboo structure based on their relative spatial positions in the world coordinate system. The infrared detection device can include an infrared beam transmitter, an infrared beam receiver, and a computing terminal. The infrared beam transmitter is used to project an infrared beam toward the entire reconstructed bamboo structure or a specific portion (such as an abnormal section). The projected infrared beam can have a circular or square cross-section to ensure uniform infrared beam intensity across the structure. The infrared beam receiver is used to receive the projected infrared beam that has passed through the structure and generate intensity data for the received infrared beam. The computing terminal is used to compare and analyze the infrared beam intensity data projected by the infrared beam transmitter with the infrared beam intensity data received by the infrared beam receiver to obtain infrared beam absorptivity data for the entire structure or a specific portion. After receiving the above-mentioned three-dimensional images and water characteristic data, the reconstructed bamboo structure strength detection and analysis device performs deformation change analysis, abnormal section calibration, structural strength anisotropy analysis, and potential fracture location on the reconstructed bamboo structure, thereby realizing global and accurate detection and analysis of the structural strength of the reconstructed bamboo structure, and providing a reliable basis for calibrating the mechanical properties of the reconstructed bamboo structure.

[0051] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by adding the necessary general-purpose hardware platform, or of course, by combining hardware and software. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a computer product. The present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it, and other embodiments may also be used. Although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for detecting and analyzing the strength of reconstructed bamboo structures, characterized in that: The method comprises the following steps: S100: Identifying a three-dimensional image of a reconstructed bamboo structure to obtain a spatial distribution of a combined structure within the structure; obtaining water characteristic data of the structure, and determining a deformation trend of the structure based on the spatial distribution of the combined structure and the water characteristic data; S200: Demarcating an abnormal section within the structure according to the deformation change trend; analyzing ultrasonic detection data of the abnormal section to obtain mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section; S300: locating potential fractures of the structure according to the anisotropy of the structural strength and the load state of the structure.

2. The method according to claim 1, characterized in that In S100, the three-dimensional image of the reconstructed bamboo structure is identified to obtain the spatial distribution of the combined structure inside the structure, specifically: Acquire three-dimensional images of all outer surfaces of the reconstructed bamboo structure, and splice the three-dimensional images of all outer surfaces according to the relative spatial position relationship of all outer surfaces to form a three-dimensional image of the reconstructed bamboo structure; Identify the pixel texture features of the three-dimensional image of the reconstructed bamboo structure, and obtain the spatial distribution of the splicing gaps of the structure based on the pixel texture features; obtain the spatial distribution of the combined structure inside the structure based on the spatial distribution of the splicing gaps and the external contour of the structure; wherein the spatial distribution of the combined structure includes the size and shape of the splicing surfaces inside the structure.

3. The method according to claim 2, characterized in that In S100, water characteristic data of the structure is obtained, and the deformation trend of the structure is determined according to the spatial distribution of the combined structure and the water characteristic data, specifically: Performing infrared light absorption detection on the structure to obtain water content characteristic data of the structure; wherein the water content characteristic data includes spatial distribution data of water content inside the structure; Based on the size and shape of the splicing surface inside the structure and the spatial distribution data of the water content, the deformation change trend of the structural parts on both sides of the splicing surface due to water absorption and expansion is determined; wherein, the deformation change trend includes the twisting deformation moment change trend between the structural parts on both sides of the splicing surface.

4. The method according to claim 3, characterized in that In S200, based on the deformation change trend, the abnormal section inside the structure is calibrated; the ultrasonic detection data of the abnormal section is analyzed to obtain the mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section, specifically: According to the variation trend of the twisting deformation moment between the construction parts on both sides of the splicing surface, it is judged whether the twisting deformation moment will destroy the bonding between the construction parts on both sides, so as to mark the abnormal section inside the structure; Ultrasonic wave velocity data of the abnormal section is extracted from the ultrasonic detection data of the abnormal section, and the ultrasonic wave velocity data is fitted to obtain the bending strength distribution data of the abnormal section; the bending strength of the bending strength distribution data in two different characteristic directions is extracted and analyzed to determine the structural strength anisotropy of the abnormal section; wherein the structural strength anisotropy includes the difference in the bending strength of the abnormal section in two different characteristic directions.

5. The method according to claim 4, characterized in that In S300, based on the anisotropy of the structural strength and the load state of the structure, the potential fracture location of the structure is performed, specifically: Extracting the load distribution actually borne by the abnormal section in two characteristic directions from the load condition of the structure; Comparing the structural strength anisotropy with the load distribution actually borne by the abnormal section in the two characteristic directions, the overload bearing effects of the abnormal section in the two characteristic directions are obtained; According to the difference between the overload bearing effects of the abnormal section in two characteristic directions, it is determined whether the abnormal section is a potential fracture occurrence section.

6. A structural strength detection and analysis device for reconstructed bamboo, characterized in that: The device comprises the following modules: An image recognition module is used to recognize the three-dimensional image of the reconstructed bamboo structure and obtain the spatial distribution of the combined structure inside the structure; a construction deformation trend determination module, configured to obtain water-containing characteristic data of the construction, and determine a deformation trend of the construction based on the spatial distribution of the combined structure and the water-containing characteristic data; An abnormal section marking module, used for marking abnormal sections inside the structure according to the deformation change trend; a strength anisotropy determination module, configured to analyze ultrasonic detection data of the abnormal section to obtain mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section; The potential fracture location module is used to locate the potential fracture of the structure according to the anisotropy of the structural strength and the load state of the structure.

7. The device according to claim 6, characterized in that The image recognition module is used to recognize the three-dimensional image of the reconstructed bamboo structure and obtain the spatial distribution of the combined structure inside the structure, specifically: Acquire three-dimensional images of all outer surfaces of the reconstructed bamboo structure, and splice the three-dimensional images of all outer surfaces according to the relative spatial position relationship of all outer surfaces to form a three-dimensional image of the reconstructed bamboo structure; Identifying pixel texture features of the three-dimensional image of the reconstructed bamboo structure, and obtaining a spatial distribution of joint gaps in the structure based on the pixel texture features; obtaining a spatial distribution of the combined structure within the structure based on the spatial distribution of the joint gaps and the external contour of the structure; wherein the spatial distribution of the combined structure includes the size and shape of the joint surfaces within the structure; The structure deformation trend determination module is used to obtain water-containing characteristic data of the structure, and determine the deformation trend of the structure according to the spatial distribution of the combined structure and the water-containing characteristic data, specifically: Performing infrared light absorption detection on the structure to obtain water content characteristic data of the structure; wherein the water content characteristic data includes spatial distribution data of water content inside the structure; Based on the size and shape of the splicing surface inside the structure and the spatial distribution data of the water content, the deformation change trend of the structural parts on both sides of the splicing surface due to water absorption and expansion is determined; wherein, the deformation change trend includes the twisting deformation moment change trend between the structural parts on both sides of the splicing surface.

8. The device according to claim 7, characterized in that The abnormal section calibration module is used to calibrate the abnormal section inside the structure according to the deformation change trend, specifically: According to the variation trend of the twisting deformation moment between the construction parts on both sides of the splicing surface, it is judged whether the twisting deformation moment will destroy the bonding between the construction parts on both sides, so as to mark the abnormal section inside the structure; The strength anisotropy determination module is used to analyze the ultrasonic detection data of the abnormal section to obtain the mechanical performance characteristics of the abnormal section, thereby determining the structural strength anisotropy of the abnormal section, specifically: Ultrasonic wave velocity data of the abnormal section is extracted from the ultrasonic detection data of the abnormal section, and the ultrasonic wave velocity data is fitted to obtain the bending strength distribution data of the abnormal section; the bending strength of the bending strength distribution data in two different characteristic directions is extracted and analyzed to determine the structural strength anisotropy of the abnormal section; wherein the structural strength anisotropy includes the difference in the bending strength of the abnormal section in two different characteristic directions.

9. The device according to claim 8, characterized in that The potential fracture location module is used to locate the potential fracture of the structure according to the anisotropy of the structural strength and the load state of the structure, specifically: Extracting the load distribution actually borne by the abnormal section in two characteristic directions from the load condition of the structure; Comparing the structural strength anisotropy with the load distribution actually borne by the abnormal section in the two characteristic directions, the overload bearing effects of the abnormal section in the two characteristic directions are obtained; According to the difference between the overload bearing effects of the abnormal section in two characteristic directions, it is determined whether the abnormal section is a potential fracture occurrence section.

10. A reconstructed bamboo structure strength detection and analysis system, characterized in that: The system comprises: Image acquisition equipment for acquiring three-dimensional images of the reconstructed bamboo structure; Infrared detection equipment, used to perform infrared light absorption detection on the reconstructed bamboo structure to obtain water content characteristic data of the structure; The recombinant bamboo construction structure strength detection and analysis device according to any one of claims 6 to 9, wherein the recombinant bamboo construction structure strength detection and analysis device is signal-connected to the image acquisition device and the infrared detection device.

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