Bearing wood strength evaluation system and method
By acquiring the geometric, material, and crack characteristic parameters of the supporting timber, and combining multi-factor correction factors and evaluation models, the effective bearing area and remaining bearing capacity of the supporting timber are calculated. This solves the problems of objectivity and speed in traditional evaluation methods, and achieves scientific and standardized evaluation.
Patent Information
- Application Number
- CN202610205040.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-12
- Publication Date
- 2026-05-15
AI Technical Summary
Traditional methods for evaluating supporting timber rely on manual visual inspection, which lacks objectivity and quantitative analysis. They cannot comprehensively consider multiple influencing factors, resulting in inconsistent evaluation results, inability to quickly detect cracks, and a lack of predictive ability for crack development trends.
A method for evaluating the strength of supporting timber is adopted. By acquiring geometric, material, working condition and crack characteristic parameters, and combining multi-factor correction factors and evaluation modes, the effective bearing area and remaining bearing capacity of the supporting timber are calculated, and an evaluation report is generated.
It has achieved a scientific and standardized assessment of the strength of supporting timber, improved the adaptability and accuracy of the assessment, and can comprehensively reflect the degree of strength loss and safety status, providing a scientific determination of safety level.
Smart Images
Figure CN122045555A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of supporting timber evaluation technology, specifically, it relates to a supporting timber strength evaluation system and method. Background Technology
[0002] As an important load-bearing component in engineering structures, support timber is widely used in shipbuilding, construction engineering, heavy machinery, storage tank support and other fields. With the continuous development of engineering technology, various new support timber materials are constantly emerging. Among them, beech phenolic resin impregnated hot-pressed material has become the preferred material for high-end support timber applications due to its excellent mechanical properties, corrosion resistance, water resistance and dimensional stability.
[0003] During use, supporting timbers inevitably develop various forms of cracks due to long-term exposure to static loads, dynamic loads, environmental corrosion, temperature changes, and humidity. These cracks significantly reduce the load-bearing capacity of the supporting timbers and, in severe cases, may lead to structural failure and safety accidents.
[0004] Traditional assessment methods mainly rely on manual visual inspection and simple measurements. The assessment results are greatly influenced by the experience of the inspectors and lack objectivity. Existing methods usually only consider the length and depth of cracks and only focus on image recognition of wood surface defects. They lack quantitative analysis and strength assessment functions for the impact of cracks and ignore the comprehensive influence of multiple factors such as crack angle, shape, width, interaction between cracks, and environmental temperature and humidity. At the same time, the assessment standards for supporting wood are not uniform in different industries and application scenarios, making it difficult to compare assessment results horizontally. Moreover, traditional assessment methods require a lot of manual calculation and data processing, with a long assessment cycle, which cannot meet the needs of rapid detection. They are mostly post-assessment and lack the ability to predict the development trend of cracks.
[0005] Therefore, there is a need for a support timber strength assessment system and method that can comprehensively consider multiple influencing factors and achieve scientific, standardized, and rapid assessment. Summary of the Invention
[0006] To address the aforementioned problems and technical deficiencies, this application adopts the following technical solution: a method for evaluating the strength of supporting timber, comprising the following steps: Obtain the geometric parameters, material properties, working environment parameters, and crack characteristic parameters of the supporting wooden component to be tested; Based on the geometric parameters and crack characteristic parameters of the supporting wooden component to be tested, determine the relative relationship between the load direction and the wood grain direction, and select the evaluation mode. Based on the geometric parameters of the supporting wooden component to be tested and the selected evaluation mode, the original bearing area is calculated; Calculate and obtain the corresponding multi-factor correction factor based on the crack characteristic parameters, and calculate the influence area of a single crack based on the multi-factor correction factor. Calculate the sum of the areas affected by each individual crack, and then correct the calculation based on the crack interaction correction coefficient, spacing effect coefficient, and environmental correction coefficient to obtain the total area affected by the crack. The effective bearing area is calculated based on the total crack influence area and the original bearing area. Then, the remaining bearing capacity is calculated by combining the material shear strength and the safety factor. The actual safety factor is then calculated based on the remaining bearing capacity. An assessment report is generated by combining the measured parameters of the supporting wooden component, the selected assessment mode, the assessment level, and the above calculation results. The report also presents the crack distribution, calculation results, and repair recommendations in the form of charts.
[0007] Preferably, the geometric parameters of the supporting wooden component to be tested are obtained by the inspector using measuring tools, and the geometric parameters include: length, width, and height; The material property parameters are selected from the material certificate or the system material library based on the material selection of the supporting wooden component to be tested. The material property parameters include: shear strength, elastic modulus, and density. The operating environment parameters include: design load, safety factor, ambient temperature, ambient humidity, and component usage history; The component's usage history includes: installation time, maintenance records, and load history; Crack characteristic parameters are measured by inspectors using crack-detecting building material tools. These parameters include: Crack geometry parameters include: crack length, depth, and width; Crack morphology parameters include: crack angle and crack shape characteristics; The spatial distribution parameters of cracks include: crack location coordinates and crack spacing.
[0008] Furthermore, the evaluation model includes: Parallel grain direction mode: Applicable when the load direction is parallel to the wood grain direction; Vertical grain direction mode: Applicable when the load direction is perpendicular to the wood grain direction; Hybrid mode: Applicable to situations where the load direction results in mixed and complex loads.
[0009] Furthermore, the original bearing area The calculation formula is as follows: ;
[0010] in, The width of the supporting wooden component to be measured. The height of the supporting wooden component to be measured is given.
[0011] Furthermore, the calculation process for the area affected by a single crack includes: Establish a preset table to store the correction coefficients and the mapping relationships corresponding to the correction coefficients; The geometric parameters, material properties, working environment parameters, and crack characteristic parameters of the supporting wooden component to be tested are calculated. Based on the mapping relationship, the calculation results are used to look up the corresponding correction coefficient from the preset table; The area affected by a single crack is calculated based on the parameters of the supporting wooden component under test and the corresponding correction coefficients. The calculation formula is as follows: ;
[0012] in, Let be the crack length of the i-th crack. Let be the crack depth of the i-th crack. This is the angle correction factor. Shape influence factor This is the width magnification factor.
[0013] Furthermore, the search for the correction coefficient includes: When the selected evaluation mode is parallel texture direction mode, it depends on the crack angle. The relationship between the load direction and the angle correction factor was obtained from a preset table using linear interpolation. ; When the selected evaluation mode is the vertical texture evaluation mode, the formula for calculating the angle correction coefficient f_θ is as follows: ;
[0014] in, This represents the influence coefficient of material texture. Calculations are performed based on crack morphology characteristics, and the shape influence factor is retrieved from a pre-defined table based on the calculation results. ; The calculation is performed based on the crack width w, and the width magnification factor is obtained from a preset table according to the calculation results. ; The calculation is based on ambient temperature (T) and ambient humidity (RH). The comprehensive environmental correction factor is then obtained from a pre-set table based on the calculation results. Comprehensive environmental correction factor Including temperature correction factor Humidity correction factor ; Calculations are performed based on crack spacing and distribution characteristics, and the interaction correction coefficient is obtained from a pre-set table according to the calculation results. .
[0015] Furthermore, the total crack influence area The calculation formula is: ;
[0016] in, This is the crack interaction correction factor. This is the spacing effect coefficient. This is the comprehensive environmental correction factor.
[0017] Furthermore, the effective bearing area The calculation formula is as follows: ; Remaining bearing capacity The calculation formula is as follows: ; Actual safety factor The calculation formula is as follows: ; in, The original bearing area, This represents the total area affected by the crack. The shear strength of the material supporting the wooden component to be tested. For safety reasons, For design loads.
[0018] Furthermore, the intensity loss rate The calculation formula is as follows: ; Crack depth percentage The calculation formula is as follows: ; in, This represents the total area affected by the crack. The original bearing area, The height of the supporting wooden component to be measured. Let be the depth of the i-th crack. Let be the width of the i-th crack, and k be a constant coefficient.
[0019] A system for assessing the strength of supporting timber, comprising: The parameter input module is used to collect and store the geometric parameters, material property parameters, working environment parameters, and crack characteristic parameters of the supported wooden component under test; The evaluation mode selection module is used to determine the relative relationship between the load direction and the wood grain direction, and to select the evaluation mode; The multi-factor coupled calculation module obtains the corresponding multi-factor correction factors and calculates the original bearing area, the influence area of a single crack and the total influence area of cracks, the remaining bearing capacity and the actual safety factor. The comprehensive evaluation module has a built-in evaluation matrix. Based on the calculation results, it performs a multi-dimensional comprehensive evaluation and generates an evaluation level and evaluation report.
[0020] Compared to existing technologies, the beneficial effects of this application are as follows: (1) Based on the relative relationship between the load direction and the wood grain direction, this application comprehensively considers more than ten influencing factors such as angle, shape, width, temperature and humidity, and interaction, and divides multiple evaluation modes. It adopts appropriate evaluation logic and calculation methods for different stress scenarios, which can meet the needs of supporting wood strength evaluation under different working conditions. It has stronger adaptability and is applicable to a variety of supporting wood materials. (2) This application introduces a multi-factor collaborative correction factor, such as angle correction factor, shape influence factor, width magnification factor, environmental correction factor, and interaction correction factor, to construct a correction mechanism that combines preset table mapping and formula calculation, accurately quantifies the influence law of each factor on crack influence area and bearing capacity, and improves the calculation accuracy of core indicators such as residual bearing capacity and actual safety factor. (3) This application adopts a multi-dimensional evaluation matrix that integrates three indicators: strength loss rate, crack depth percentage, and actual safety factor. This matrix breaks through the limitations of existing single-indicator evaluation and can comprehensively and accurately reflect the degree of strength loss, crack risk and overall safety status of the supporting timber. It provides a more scientific basis for safety level determination and avoids the risk of misjudgment caused by single-indicator evaluation. Attached Figure Description
[0021] In the attached diagram: Figure 1 This is a schematic diagram of the method steps in an embodiment of this application; Figure 2 This is a schematic diagram of the system structure according to an embodiment of this application. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments. Generally, the components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations.
[0023] Example 1 like Figure 1 As shown, a method for evaluating the strength of supporting timber includes the following steps: Obtain the geometric parameters, material properties, working environment parameters, and crack characteristic parameters of the supporting wooden component to be tested; The geometric parameters of the supporting wooden component to be tested are obtained by the inspector using measuring tools. The geometric parameters include: length L, width W, and height H. The material property parameters are selected from the material certificate or the system material library based on the material selection of the supporting wooden component to be tested. The material property parameters include: shear strength fv, elastic modulus E, and density ρ. Operating environment parameters include: design load, safety factor γ, ambient temperature T, ambient humidity RH, and component usage history t; The component's usage history includes: installation time, maintenance records, and load history.
[0024] Crack characteristic parameters are measured by inspectors using crack-detecting building material tools. These parameters include: Crack geometry parameters include: crack length l, depth d, and width w; Crack morphology parameters include: crack angle θ and crack shape characteristics; The spatial distribution parameters of cracks include: crack location coordinates and crack spacing.
[0025] Based on the geometric parameters and crack characteristic parameters of the supporting wooden component to be tested, determine the relative relationship between the load direction and the wood grain direction, and select the evaluation mode. The evaluation models include: Parallel grain direction mode: Applicable when the load direction is parallel to the wood grain direction; Vertical grain direction mode: Applicable when the load direction is perpendicular to the wood grain direction; Hybrid mode: Applicable to situations where the load direction results in mixed and complex loads.
[0026] Based on the geometric parameters of the supporting wooden component to be tested and the selected evaluation mode, the original bearing area is calculated; Original bearing area The calculation formula is as follows: ; in, The width of the supporting wooden component to be measured. The height of the supporting wooden component to be measured is given.
[0027] Calculate and obtain the corresponding multi-factor correction factor based on the crack characteristic parameters, and calculate the influence area of a single crack based on the multi-factor correction factor. The calculation process for the area affected by a single crack includes: Establish a preset table to store the correction coefficients and the mapping relationships corresponding to the correction coefficients; The geometric parameters, material properties, working environment parameters, and crack characteristic parameters of the supporting wooden component to be tested are calculated. Based on the mapping relationship, the calculation results are used to look up the corresponding correction coefficient from the preset table; The area affected by a single crack is calculated based on the parameters of the supporting wooden component under test and the corresponding correction coefficients. The calculation formula is as follows: ; in, Let be the crack length of the i-th crack. Let be the crack depth of the i-th crack. This is the angle correction factor. Shape influence factor This is the width magnification factor.
[0028] The search for correction factors includes: When the selected evaluation mode is parallel texture direction mode, it depends on the crack angle. The relationship between the load direction and the angle correction factor was obtained from a preset table using linear interpolation. ; When the selected evaluation mode is the vertical texture evaluation mode, the formula for calculating the angle correction coefficient f_θ is as follows: ; in, This represents the influence coefficient of material texture. Calculations are performed based on crack morphology characteristics, and the shape influence factor is retrieved from a pre-defined table based on the calculation results. ; The calculation is performed based on the crack width w, and the width magnification factor is obtained from a preset table according to the calculation results. ; The calculation is based on ambient temperature (T) and ambient humidity (RH). The comprehensive environmental correction factor is then obtained from a pre-set table based on the calculation results. Comprehensive environmental correction factor Including temperature correction factor Humidity correction factor ; Calculations are performed based on crack spacing and distribution characteristics, and the interaction correction coefficient is obtained from a pre-set table according to the calculation results. .
[0029] Calculate the sum of the areas affected by each individual crack, and then correct the calculation based on the crack interaction correction coefficient, spacing effect coefficient, and environmental correction coefficient to obtain the total area affected by the crack. Total crack area The calculation formula is: ;
[0030] in, This is the crack interaction correction factor. This is the spacing effect coefficient. This is the comprehensive environmental correction factor.
[0031] The effective bearing area is calculated based on the total crack influence area and the original bearing area. Then, the remaining bearing capacity is calculated by combining the material shear strength and the safety factor. The actual safety factor is then calculated based on the remaining bearing capacity. Effective bearing area The calculation formula is as follows: ; Remaining bearing capacity The calculation formula is as follows: ; Actual safety factor The calculation formula is as follows: ; in, The original bearing area, This represents the total area affected by the crack. The shear strength of the material supporting the wooden component to be tested. For safety reasons, For design loads.
[0032] Calculate the strength loss rate and crack depth percentage, combine the strength loss rate, crack depth percentage and actual safety factor and map them to a preset evaluation matrix to perform a multi-dimensional comprehensive evaluation and obtain the evaluation level; The strength loss rate The calculation formula is as follows: ; Crack depth percentage The calculation formula is as follows: ; in, This represents the total area affected by the crack. The original bearing area, The height of the supporting wooden component to be measured. Let be the depth of the i-th crack. Let be the width of the i-th crack, and k be a constant coefficient.
[0033] An assessment report is generated by combining the measured parameters of the supporting wooden component, the selected assessment mode, the assessment level, and the above calculation results. The report also presents the crack distribution, calculation results, and repair recommendations in the form of charts.
[0034] Example 2
[0035] Obtain the geometric parameters, material properties, working environment parameters, and crack characteristic parameters of the supporting wooden component to be tested; Based on the geometric parameters and crack characteristic parameters of the wooden support component to be tested, the relative relationship between the load direction and the wood grain direction is determined, and the evaluation mode is selected. Based on the geometric parameters of the wooden supporting component to be tested and the selected evaluation mode, the original bearing area is calculated; Calculate and obtain the corresponding multi-factor correction factor based on the crack characteristic parameters, and calculate the influence area of a single crack based on the multi-factor correction factor. Calculate the sum of the areas affected by each individual crack, and then correct the calculation based on the crack interaction correction coefficient, spacing effect coefficient, and environmental correction coefficient to obtain the total area affected by the crack. The effective bearing area is calculated based on the total crack influence area and the original bearing area. Then, the remaining bearing capacity is calculated by combining the material shear strength and the safety factor. The actual safety factor is then calculated based on the remaining bearing capacity. An assessment report is generated by combining the measured parameters of the supported wooden component, the selected assessment mode, the assessment level, and the above calculation results. The report also presents the crack distribution, calculation results, and repair recommendations in the form of charts.
[0036] The supporting wooden components to be tested refer to wooden load-bearing parts that require strength evaluation and are used in shipbuilding, construction engineering, heavy machinery or tank support and other fields.
[0037] Geometric parameters refer to the physical dimensional information of the supporting wooden component to be measured, such as its length, width, or height. These parameters can be obtained through manual measurement or using conventional measuring equipment.
[0038] Material property parameters refer to the inherent physical and mechanical properties of the wood used in the supporting wooden component to be tested, such as its shear strength, modulus of elasticity, or density. These parameters can usually be obtained from certificates provided by material suppliers or from pre-set material databases.
[0039] The working environment parameters refer to the external conditions and historical information that the supporting wooden component under test is subjected to during actual use, such as design load, preset safety factor, ambient temperature, ambient humidity, or the component's usage history. The component's usage history may include installation time, maintenance records, or load history.
[0040] Crack characteristic parameters refer to detailed information about cracks present on the supporting wooden component under test, such as the geometric dimensions, morphological characteristics, or spatial distribution of the cracks. These parameters can be measured by manual observation or by using crack detection tools.
[0041] The evaluation mode refers to the strength evaluation method selected based on the relative relationship between the load direction and the wood grain direction. For example, when the load direction is parallel to the wood grain direction, one evaluation mode can be selected; when the load direction is perpendicular to the wood grain direction, another evaluation mode can be selected; when the load direction is complex, a hybrid mode can be selected.
[0042] The original load-bearing area refers to the theoretical load-bearing cross-sectional area of the supported wooden component under a specific evaluation mode, without considering the influence of cracks. This area is usually calculated based on the geometric parameters of the component and the selected evaluation mode.
[0043] The multi-factor correction factor is a comprehensive correction coefficient used to quantify the impact of cracks on the load-bearing capacity of supporting wooden components. This factor takes into account a variety of characteristics of the crack, such as the crack's geometry, morphology, or environmental conditions.
[0044] The area affected by a single crack refers to the loss of load-bearing area caused by the presence of a single crack. This area is calculated based on crack characteristic parameters and corresponding multi-factor correction factors.
[0045] The crack interaction correction factor refers to the correction factor that may affect the overall load-bearing capacity when multiple cracks are close to each other, due to their mutual influence.
[0046] The spacing effect coefficient is a correction factor for the influence of the distance between cracks on the load-bearing capacity. When the crack spacing is small, its influence on the load-bearing capacity may be greater than the simple sum of the influence of a single crack.
[0047] The environmental correction factor refers to the correction factor for the influence of external environmental factors such as ambient temperature and humidity on the load-bearing capacity of supporting wooden components.
[0048] The total crack impact area refers to the total loss of bearing area caused by the combined effect of all cracks on the supported wooden component under test. This area is calculated by superimposing the impact areas of each individual crack and considering the crack interaction correction coefficient, spacing effect coefficient and environmental correction coefficient.
[0049] The effective load-bearing area refers to the actual load-bearing cross-sectional area of the supported wooden component under test after considering the effects of all cracks. This area is obtained by subtracting the total crack-affected area from the original load-bearing area.
[0050] Shear strength refers to the ability of wood to resist shear forces and is an important mechanical parameter for evaluating the load-bearing capacity of supporting wooden components.
[0051] The safety factor is a margin factor introduced in engineering design to ensure structural safety. It is used to adjust the theoretically calculated bearing capacity against the actual allowable bearing capacity.
[0052] Residual bearing capacity refers to the maximum load that the supported wooden component under test can still withstand in its current state, provided that a preset safety factor is met.
[0053] The actual safety factor refers to the true safety margin that the supporting wooden component possesses under the current load and component conditions.
[0054] Example 3
[0055] First, obtain the basic parameters of the supporting wooden component to be tested. These parameters include geometric parameters, material property parameters, working environment parameters, and crack characteristic parameters. Geometric parameters can be measured manually using tools such as tape measures and calipers, and the basic dimensions of the component, such as length, width, and height, can be recorded.
[0056] Material property parameters can be provided by the component supplier or obtained by consulting a general materials handbook, such as the shear strength and modulus of elasticity of wood.
[0057] Environmental parameters can be recorded by on-site engineers based on actual usage conditions, such as the expected load on the component, ambient temperature, and ambient humidity.
[0058] Crack characteristic parameters can be recorded by visual inspection and using simple measuring tools (such as rulers and magnifying glasses) to measure the length, width, depth, approximate direction, and location of the crack.
[0059] Based on the obtained geometric parameters and crack characteristic parameters of the supporting wooden component to be tested, it is necessary to determine the relative relationship between the load direction and the wood grain direction, and select an appropriate evaluation mode. By observing the wood grain direction and the force direction of the component, it can be manually judged whether the two are roughly parallel, roughly perpendicular, or present a complex angle. Based on this judgment, a preset evaluation model can be selected, which is designed to be applicable to a specific load-texture relationship.
[0060] Based on the geometric parameters of the supporting wooden component to be tested and the selected evaluation mode, the original bearing area is calculated. For a supporting wooden component with a rectangular cross section, its original bearing area can be simply obtained by multiplying the cross section width by the height. If the evaluation mode considers a specific stress area, the original bearing area will be calculated based on the effective stress area under that mode.
[0061] Based on the crack characteristic parameters, the corresponding multi-factor correction factor is calculated and obtained. The influence area of a single crack is calculated based on the multi-factor correction factor. According to the characteristics of crack length, depth, width, and location, a correction factor that comprehensively reflects the degree of crack influence can be obtained by manual consultation or calculation through preset empirical formulas or charts. Then, the correction factor is calculated with the geometric dimensions of the component or the original bearing area to estimate the bearing area loss caused by the single crack.
[0062] The sum of the influence areas of each individual crack needs to be calculated, and then corrected according to crack interaction correction coefficients, spacing effect coefficients, and environmental correction coefficients to obtain the total crack influence area. For example, the influence areas of all calculated individual cracks can be simply summed. Based on this, the corresponding crack interaction correction coefficients, spacing effect coefficients, and environmental correction coefficients can be obtained through experience or by consulting a pre-set correction table, based on factors such as the distance between cracks, their distribution density, and environmental temperature and humidity. These coefficients will be applied to the sum of the influence areas of the individual cracks to more accurately reflect the combined impact of multiple cracks and environmental factors on the load-bearing capacity.
[0063] The effective bearing area is calculated based on the total crack influence area and the original bearing area. Then, the remaining bearing capacity is calculated by combining the material shear strength and the safety factor. The actual safety factor is calculated based on the remaining bearing capacity. The effective bearing area can be obtained by subtracting the total crack influence area from the original bearing area. The remaining bearing capacity can be estimated by multiplying the effective bearing area by the material shear strength and then dividing by the preset safety factor. The actual safety factor is determined by comparing the actual bearing capacity of the component with the current load.
[0064] Finally, by combining the measured parameters of the supported wooden component, the selected evaluation mode, the evaluation level, and the above calculation results, an evaluation report is generated. The report also presents the crack distribution, calculation results, and repair recommendations in a graphical format. All the collected raw data, intermediate calculation results, final remaining bearing capacity, actual safety factor, and recommended evaluation level are compiled into a written report, with each calculation data listed in a table, and repair recommendations based on the evaluation results provided.
[0065] Example 4
[0066] like Figure 2 As shown, a support timber strength assessment system includes: The parameter input module is used to collect and store the geometric parameters, material property parameters, working environment parameters, and crack characteristic parameters of the supported wooden component under test; The evaluation mode selection module is used to determine the relative relationship between the load direction and the wood grain direction, and to select the evaluation mode; The multi-factor coupled calculation module obtains the corresponding multi-factor correction factors and calculates the original bearing area, the influence area of a single crack and the total influence area of cracks, the remaining bearing capacity and the actual safety factor. The comprehensive evaluation module has a built-in evaluation matrix. Based on the calculation results, it performs a multi-dimensional comprehensive evaluation and generates an evaluation level and evaluation report.
[0067] The embodiments described above are merely preferred embodiments of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications, improvements, and substitutions without departing from the concept of this application, and these all fall within the protection scope of this application.
Claims
1. A method for evaluating the strength of supporting timber, characterized in that, Includes the following steps: Obtain the geometric parameters, material properties, working environment parameters, and crack characteristic parameters of the supporting wooden component to be tested; Based on the geometric parameters and crack characteristic parameters of the supporting wooden component to be tested, determine the relative relationship between the load direction and the wood grain direction, and select the evaluation mode. Based on the geometric parameters of the supporting wooden component to be tested and the selected evaluation mode, the original bearing area is calculated; Calculate and obtain the corresponding multi-factor correction factor based on the crack characteristic parameters, and calculate the influence area of a single crack based on the multi-factor correction factor. Calculate the sum of the areas affected by each individual crack, and then correct the calculation based on the crack interaction correction coefficient, spacing effect coefficient, and environmental correction coefficient to obtain the total area affected by the crack. The effective bearing area is calculated based on the total crack influence area and the original bearing area. Then, the remaining bearing capacity is calculated by combining the material shear strength and the safety factor. The actual safety factor is then calculated based on the remaining bearing capacity. An assessment report is generated by combining the measured parameters of the supporting wooden component, the selected assessment mode, the assessment level, and the above calculation results. The report also presents the crack distribution, calculation results, and repair recommendations in the form of charts.
2. The method for evaluating the strength of supporting timber according to claim 1, characterized in that, The geometric parameters of the supporting wooden component to be tested are obtained by the testing personnel using measuring tools. The geometric parameters include: length, width, and height. The material property parameters are selected from the material certificate or the system material library based on the material selection of the supporting wooden component to be tested. The material property parameters include: shear strength, elastic modulus, and density. The operating environment parameters include: design load, safety factor, ambient temperature, ambient humidity, and component usage history; The component's usage history includes: installation time, maintenance records, and load history; Crack characteristic parameters are measured by inspectors using crack-detecting building material tools. These parameters include: Crack geometry parameters include: crack length, depth, and width; Crack morphology parameters include: crack angle and crack shape characteristics; The spatial distribution parameters of cracks include: crack location coordinates and crack spacing.
3. The method for evaluating the strength of supporting timber according to claim 2, characterized in that, The evaluation mode includes: Parallel grain direction mode: Applicable when the load direction is parallel to the wood grain direction; Vertical grain direction mode: Applicable when the load direction is perpendicular to the wood grain direction; Hybrid mode: Applicable to situations where the load direction results in mixed and complex loads.
4. The method for evaluating the strength of supporting timber according to claim 2, characterized in that, The original bearing area The calculation formula is as follows: ； in, The width of the supporting wooden component to be measured. The height of the supporting wooden component to be measured is given.
5. The method for evaluating the strength of supporting timber according to claim 4, characterized in that, The calculation process for the area affected by a single crack includes: Establish a preset table to store the correction coefficients and the mapping relationships corresponding to the correction coefficients; The geometric parameters, material properties, working environment parameters, and crack characteristic parameters of the supporting wooden component to be tested are calculated. Based on the mapping relationship, the calculation results are used to look up the corresponding correction coefficient from the preset table; The area affected by a single crack is calculated based on the parameters of the supporting wooden component under test and the corresponding correction coefficients. The calculation formula is as follows: ； in, Let be the crack length of the i-th crack. Let be the crack depth of the i-th crack. This is the angle correction factor. Shape influence factor This is the width magnification factor.
6. The method for evaluating the strength of supporting timber according to claim 5, characterized in that, The lookup of the correction coefficient includes: When the selected evaluation mode is parallel texture direction mode, it depends on the crack angle. The relationship between the load direction and the angle correction factor was obtained from a preset table using linear interpolation. ; When the selected evaluation mode is the vertical texture evaluation mode, the formula for calculating the angle correction coefficient f_θ is as follows: ； in, This represents the influence coefficient of material texture. Calculations are performed based on crack morphology characteristics, and the shape influence factor is retrieved from a pre-defined table based on the calculation results. ; The calculation is performed based on the crack width w, and the width magnification factor is obtained from a preset table according to the calculation results. ; The calculation is based on ambient temperature (T) and ambient humidity (RH). The comprehensive environmental correction factor is then obtained from a pre-set table based on the calculation results. Comprehensive environmental correction factor Including temperature correction factor Humidity correction factor ; Calculations are performed based on crack spacing and distribution characteristics, and the interaction correction coefficient is obtained from a pre-set table according to the calculation results. .
7. The method for evaluating the strength of supporting timber according to claim 6, characterized in that, The total area affected by cracks The calculation formula is: ； in, This is the crack interaction correction factor. This is the spacing effect coefficient. This is the comprehensive environmental correction factor.
8. The method for evaluating the strength of supporting timber according to claim 7, characterized in that, The effective bearing area The calculation formula is as follows: ； Remaining bearing capacity The calculation formula is as follows: ； Actual safety factor The calculation formula is as follows: ； in, The original bearing area, This represents the total area affected by the crack. The shear strength of the material supporting the wooden component to be tested. For safety reasons, For design load.
9. The method for evaluating the strength of supporting timber according to claim 8, characterized in that, The strength loss rate The calculation formula is as follows: ； Crack depth percentage The calculation formula is as follows: ； in, This represents the total area affected by the crack. The original bearing area, The height of the supporting wooden component to be measured. Let be the depth of the i-th crack. Let be the width of the i-th crack, and k be a constant coefficient.
10. A system for evaluating the strength of supporting timber, characterized in that, include: The parameter input module is used to collect and store the geometric parameters, material property parameters, working environment parameters, and crack characteristic parameters of the supported wooden component under test; The evaluation mode selection module is used to determine the relative relationship between the load direction and the wood grain direction, and to select the evaluation mode; The multi-factor coupled calculation module obtains the corresponding multi-factor correction factors and calculates the original bearing area, the influence area of a single crack and the total influence area of cracks, the remaining bearing capacity and the actual safety factor. The comprehensive evaluation module has a built-in evaluation matrix. Based on the calculation results, it performs a multi-dimensional comprehensive evaluation and generates an evaluation level and evaluation report.