A method and system for predicting the life of concrete structures based on marine erosion

Abstract

The present invention provides a method and system for predicting the life of a concrete structure based on marine erosion, and relates to the technical field of concrete life prediction. The present invention accurately divides the surface area of ​​the concrete structure, collects the thickness, coverage rate and corresponding pH value change data of marine biological attachments in real time, analyzes and quantifies the deterioration degree of each area, and constructs a comprehensive evaluation model in combination with the evaluation index and the correlation evaluation coefficient, thereby realizing the accurate calculation of the deterioration rate of each area on the surface of the concrete structure and the scientific prediction of the overall life, effectively solving the problems of insufficient data coverage, poor real-time performance and lack of regional independent analysis in the prior art, and providing strong technical support for the maintenance and management of marine engineering.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete life prediction, and in particular to a method and system for predicting the life of a concrete structure based on marine erosion. Background Art

[0002] Various types of engineering buildings in the marine environment, such as docks, breakwaters and offshore platforms, are gradually increasing. These structures are usually made of concrete materials, which face complex and severe degradation problems in the marine environment. Marine erosion, which covers a variety of factors such as wave impact, tidal changes and attachment of marine organisms, has a significant impact on the durability and service life of concrete structures. In the existing technology, the degradation detection and life prediction of concrete structures in the marine environment mainly rely on regular manual inspections and empirical evaluations. This method is not only time-consuming and labor-intensive, but also the test results are highly subjective and uncertain. In addition, although some existing monitoring methods such as electrochemical measurement methods and acoustic wave detection methods can provide certain data support, they have significant deficiencies in coverage, accuracy and real-time performance;

[0003] In the prior art, the publication number is CN115545298A, and the name is a method for predicting the stability of weathering troughs in submarine tunnels under the action of typhoon waves. When waves continue to act on the weathering trough soil, on the one hand, the wave pressure causes a sliding force in the weathering trough, and on the other hand, the weathering trough's own gravity also constitutes a sliding force. The cyclic pressure causes the strength of the weathering trough soil to decay. After the decay, the soil strength has a sliding resistance force that prevents the weathering trough from sliding. If the sliding resistance force is less than the sliding force, the weathering trough will slide and lose stability.

[0004] The main drawback of existing technologies is the lack of accurate and systematic monitoring and analysis of different areas in the marine environment. The splash zone, tidal zone and full immersion zone have different degradation rates and mechanisms due to different environmental conditions; existing technologies fail to specifically divide and independently analyze these areas, which greatly reduces the accuracy of life prediction. In addition, existing methods have little research on the impact of marine biological attachments on concrete surfaces, ignoring the potential impact of biological attachments on crack expansion, steel corrosion and porosity changes;

[0005] The above information disclosed in the above Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0006] The purpose of the present invention is to provide a method and system for predicting the life of concrete structures based on marine erosion, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for predicting the life of a concrete structure based on marine erosion, the specific steps comprising:

[0009] Step S1: the surface area of ​​the concrete structure is divided into a wave splashing area, a tidal rising area and a full immersion area in turn according to the sea erosion effect, and the thickness and coverage of the marine biological attachments on each area of ​​the concrete structure surface, as well as the pH value change of the concrete surface under the marine biological attachments are collected at regular intervals, and the collected data are transmitted to the data processing unit;

[0010] Step S2: receiving the pre-processed thickness, coverage and pH value change data in the wave splash zone, tidal zone and full immersion zone, and analyzing and processing them respectively to calculate the evaluation index for evaluating the sea erosion degree of each area on the surface of the concrete structure;

[0011] Step S3: Obtain historical data of degradation rates of the wave splash zone, tidal zone, and full immersion zone under different evaluation index output values, and perform correlation analysis respectively to calculate the correlation evaluation coefficient of each area on the surface of the concrete structure; the correlation evaluation coefficient is used to evaluate the degree of correlation of degradation rates of each area on the surface of the concrete structure under different evaluation index output values, and the degradation rates include crack propagation rate, steel corrosion rate, and porosity change rate;

[0012] Step S4: combining the evaluation index and the correlation evaluation coefficient of each area on the surface of the concrete structure, constructing a comprehensive evaluation model for predicting the life of each area on the surface of the concrete structure;

[0013] Step S5: Input the thickness, coverage and pH value change data of each area on the surface of the concrete structure monitored at the current collection point into the comprehensive evaluation model to calculate the degradation rate of each area on the surface of the concrete structure, and based on the degradation rate of each area, predict the overall life of the concrete structure.

[0014] Furthermore, the evaluation index The degradation rate under different value ranges is calculated and analyzed. The specific ranges and degradation rate calculations are as follows:

[0015] Will , , , , Marked as interval 1, interval 2, interval 3, interval 4, interval 5 in sequence; set i∈{1,2,3,4,5}, i represents the i-th interval index;

[0016] Introduction The crack growth rate, steel corrosion rate, and porosity change rate of each area on the concrete structure surface corresponding to the output value of the evaluation index in the i-th interval are marked as , , ; and p in each of the following calculation formulas is the same value p1 or p2 or p3;

[0017] Combination , , , comprehensively forming the degradation rate of each area on the concrete structure surface corresponding to the i-th interval , The calculation formula is as follows:

[0018] ;

[0019] Among them, b1, b2, b3 are the weight coefficients of the corresponding parameters, and ;

[0020] The correlation evaluation coefficients of various areas on the surface of the concrete structure are calculated as follows:

[0021] ;

[0022] in, Represents the correlation evaluation coefficient of each area on the surface of the concrete structure, is the output value of the evaluation index corresponding to the i-th interval, is the degradation rate under the output value of the evaluation index corresponding to the i-th interval, and are the means of evaluation index and degradation rate respectively.

[0023] Furthermore, combined with the evaluation index and correlation evaluation coefficient of each area on the surface of the concrete structure, a comprehensive evaluation model for life prediction of each area on the surface of the concrete structure is constructed, which specifically includes:

[0024] based on , the evaluation indexes corresponding to the wave splash zone, tidal surge zone and full immersion zone are determined as follows: , , ; Determine the correlation evaluation coefficients corresponding to the wave splash zone, tidal surge zone and full immersion zone as follows: , , ;

[0025] The comprehensive evaluation model for defining the wave splash zone is:

[0026] ;

[0027] The comprehensive evaluation model for tidal surge areas is defined as:

[0028] ;

[0029] The comprehensive evaluation model for the full immersion area is defined as:

[0030] ;

[0031] in, , , They are the evaluation values ​​of the wave splash zone, tidal surge zone and full immersion zone respectively; is the weight coefficient of the corresponding parameter, representing the contribution of the evaluation index and correlation coefficient to life prediction. .

[0032] Furthermore, the degradation rate of each area on the surface of the concrete structure is calculated, and based on the degradation rate of each area, the overall life of the concrete structure is predicted, including:

[0033] Based on the degradation rate of each area on the concrete structure surface in the i-th interval , the comprehensive degradation rate of the wave splash zone is defined as , the calculation formula is as follows:

[0034] ;

[0035] The comprehensive degradation rate of the tidal flood zone is defined as , the calculation formula is as follows:

[0036] ;

[0037] The comprehensive degradation rate of the full immersion area is defined as , the calculation formula is as follows:

[0038] ;

[0039] in, are the coefficients for adjusting the impact of comprehensive evaluation results on degradation rate, ;

[0040] According to the deterioration rate, the remaining life of each area on the surface of the concrete structure is calculated and a comprehensive evaluation is conducted; the following standards are defined:

[0041] The formula for defining the life of each area on the surface of a concrete structure is:

[0042] ;

[0043] in, is the remaining life, D is the design life, is the deterioration rate of the corresponding concrete structure surface area; , , They represent the remaining life of the sea wave splash zone, tidal surge zone and full immersion zone on the surface of the concrete structure respectively;

[0044] The overall life prediction formula is defined as:

[0045] ;

[0046] in, is the predicted value of the comprehensive life of the concrete structure as a whole, are the area values ​​of the wave splash zone, tidal surge zone and full immersion zone, respectively, and All are processed by normalization, scaling and offset in turn. The value range is (0,1).

[0047] A system for predicting the life of a concrete structure based on marine erosion, the system being used to execute the method for predicting the life of a concrete structure based on marine erosion, comprising:

[0048] Division and collection unit: used to divide the surface area of ​​the concrete structure into wave splash zone, tidal zone and full immersion zone in accordance with the sea erosion effect, and regularly collect the thickness and coverage of marine biological attachments on each area of ​​the concrete structure surface, as well as the pH value change of the concrete surface under the marine biological attachments, and transmit the collected data to the data processing unit;

[0049] Index generation unit: used to receive the pre-processed thickness, coverage and pH value change data in the wave splash zone, tidal zone and full immersion zone, and analyze and process them respectively to calculate the evaluation index used to evaluate the sea erosion degree of each area on the surface of the concrete structure;

[0050] Correlation analysis unit: used to obtain the historical data of degradation rate of the wave splash zone, tidal zone and full immersion zone under different evaluation index output values, and perform correlation analysis respectively to calculate the correlation evaluation coefficient of each area on the surface of the concrete structure; the correlation evaluation coefficient is used to evaluate the correlation degree of degradation rate of each area on the surface of the concrete structure under different evaluation index output values, and the degradation rate includes crack propagation rate, steel corrosion rate and porosity change rate;

[0051] Comprehensive evaluation model construction unit: used to combine the evaluation index and correlation evaluation coefficient of each area on the surface of the concrete structure to construct a comprehensive evaluation model for life prediction of each area on the surface of the concrete structure;

[0052] Life prediction unit: It is used to input the thickness, coverage and pH value change data of each area on the surface of the concrete structure monitored at the current collection point into the comprehensive evaluation model to calculate the degradation rate of each area on the surface of the concrete structure, and based on the degradation rate of each area, predict the overall life of the concrete structure.

[0053] Compared with the prior art, the beneficial effects of the present invention are: by accurately dividing the surface areas of the concrete structure, collecting the thickness, coverage and corresponding pH value change data of the marine biological attachments in real time, analyzing and quantifying the degree of deterioration of each area, and combining the evaluation index and the correlation evaluation coefficient to construct a comprehensive evaluation model, the degradation rate of each area on the surface of the concrete structure is accurately calculated and the overall life span is scientifically predicted, which effectively solves the problems of insufficient data coverage, poor real-time performance and lack of regional independent analysis in the prior art, and provides strong technical support for the maintenance and management of marine engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of the overall method flow of the present invention;

[0055] Figure 2 This is a block diagram of the overall system module of the present invention. DETAILED DESCRIPTION

[0056] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0057] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0058] Embodiment 1:

[0059] See also Figure 1 , the present invention provides a technical solution:

[0060] A method for predicting the life of a concrete structure based on marine erosion, the specific steps comprising:

[0061] Step S1: the surface area of ​​the concrete structure is divided into a wave splashing area, a tidal rising area and a full immersion area in turn according to the sea erosion effect, and the thickness and coverage of the marine biological attachments on each area of ​​the concrete structure surface, as well as the pH value change of the concrete surface under the marine biological attachments are collected at regular intervals, and the collected data are transmitted to the data processing unit;

[0062] Step S2: receiving the pre-processed thickness, coverage and pH value change data in the wave splash zone, tidal zone and full immersion zone, and analyzing and processing them respectively to calculate the evaluation index for evaluating the sea erosion degree of each area on the surface of the concrete structure;

[0063] Step S3: Obtain historical data of degradation rates of the wave splash zone, tidal zone, and full immersion zone under different evaluation index output values, and perform correlation analysis respectively to calculate the correlation evaluation coefficient of each area on the surface of the concrete structure; the correlation evaluation coefficient is used to evaluate the degree of correlation of degradation rates of each area on the surface of the concrete structure under different evaluation index output values, and the degradation rates include crack propagation rate, steel corrosion rate, and porosity change rate;

[0064] Step S4: combining the evaluation index and the correlation evaluation coefficient of each area on the surface of the concrete structure, constructing a comprehensive evaluation model for predicting the life of each area on the surface of the concrete structure;

[0065] Step S5: Input the thickness, coverage and pH value change data of each area on the surface of the concrete structure monitored at the current collection point into the comprehensive evaluation model to calculate the degradation rate of each area on the surface of the concrete structure, and based on the degradation rate of each area, predict the overall life of the concrete structure.

[0066] Further, the thickness and coverage of marine biological attachments in each area, as well as the pH value change of the concrete surface under the marine biological attachments are collected at regular intervals, and the collected data are transmitted to the data processing unit, specifically including:

[0067] The wave splash zone, tidal surge zone and full immersion zone are represented by p1, p2 and p3 respectively;

[0068] The thickness, coverage and pH value changes of the wave splash zone p1 are marked as , , ;

[0069] The thickness, coverage and pH value changes of the tidal zone p2 are marked as , , ;

[0070] The thickness, coverage and pH value changes of the full immersion area p3 are marked as , , ;

[0071] For the changes in thickness, coverage and pH value, the thickness sensor, coverage sensor and pH sensor are used in turn for monitoring and collection;

[0072] The scheduled data collection is set to collect data once every t hours, and the collected data is transmitted to the data processing unit through the wireless network for data preprocessing, and each parameter after preprocessing is transmitted to the central database for storage. Data preprocessing includes:

[0073] The collected data is preliminarily cleaned to remove obvious noise and outliers, and the thickness, coverage and pH value changes are statistically analyzed using data processing software to calculate the mean and standard deviation of each parameter; each preprocessed parameter is then transmitted to the central database for storage.

[0074] Further explanation: the calculation of the evaluation index specifically includes:

[0075] The received thickness, coverage and pH value change data are analyzed and processed by region, including:

[0076] The establishment principle of setting the comparison threshold is as follows: based on the expert group system, the thickness, coverage and pH value changes of each area on the surface of the concrete structure are determined respectively. The corresponding benchmark values; when any two parameters of thickness, coverage and pH value change remain unchanged, when the change of the third parameter reaches 10% of the corresponding benchmark value, the values ​​reaching 10% of the corresponding benchmark value are used as the comparison threshold;

[0077] Based on the establishment principle of comparison threshold, the comparison thresholds of thickness, coverage and pH value changes in the wave splash zone, tidal zone and full immersion zone are determined respectively; and the comparison threshold can also be adjusted and determined by the expert group based on experimental data;

[0078] The thickness value corresponding to the comparison threshold is marked as ; Mark the coverage value corresponding to the comparison threshold as ; The pH value change corresponding to the comparison threshold is marked as ;

[0079] Calculate the change ratio of each parameter in the wave splash zone, tidal surge zone and full immersion zone in turn, and set , and p in each of the following calculation formulas is the same value p1 or p2 or p3;

[0080] The thickness change ratio is marked as , the calculation formula is:

[0081] ;

[0082] This formula represents the thickness value currently collected Compare with the corresponding threshold The difference percentage of

[0083] The coverage change ratio is marked as , the calculation formula is:

[0084] ;

[0085] This formula represents the coverage value currently collected Compare with the corresponding threshold The difference percentage of

[0086] The ratio of the change in pH value is marked as , the calculation formula is:

[0087] ;

[0088] This formula represents the change in the pH value currently collected Compare with the corresponding threshold The difference percentage of

[0089] The specific steps are as follows:

[0090] For the wave splash zone p1:

[0091] Calculate the thickness change ratio: ;

[0092] Calculate the coverage change ratio: ;

[0093] Calculate the pH change ratio: ;

[0094] For the tidal flood zone p2:

[0095] Calculate the thickness change ratio: ;

[0096] Calculate the coverage change ratio: ;

[0097] Calculate the pH change ratio: ;

[0098] For full immersion area p3:

[0099] Calculate the thickness change ratio: ;

[0100] Calculate the coverage change ratio: ;

[0101] Calculate the pH change ratio: ;

[0102] The evaluation index of sea erosion degree in each area is calculated based on the change ratio of thickness, coverage and pH value. :

[0103] ;

[0104] in, are the weight coefficients of thickness, coverage and pH value change, ; Determined by the expert group through experimental data, no further elaboration is given;

[0105] Further explanation: the evaluation of the degree of sea erosion in various areas on the surface of the concrete structure includes:

[0106] Evaluation Index The value range of is -100% to 100%; the wave splash zone, tidal zone and full immersion zone are represented by "this area"; the evaluation index The evaluation contents at different output values ​​are as follows:

[0107] when When , it means that the thickness, coverage or pH value changes in the area show negative growth, and each parameter is less than the corresponding comparison threshold, indicating that the degree of sea erosion of the concrete structure in the area is less than 10%;

[0108] when When , it means that the degree of sea erosion in this area is relatively low and the concrete structure is in good condition; the degree of sea erosion is relatively low, and the corresponding characteristics are described as follows:

[0109] The thickness increase ratio exceeds the corresponding comparison threshold of 0% to 5%;

[0110] The coverage increase ratio exceeds the corresponding alignment threshold of 0% to 5%;

[0111] The change ratio of pH value change exceeds ±5% of the corresponding comparison threshold;

[0112] when When , it means that the degree of marine erosion in the area is moderate and monitoring and maintenance are needed;

[0113] The degree of sea erosion is moderate, and the corresponding characteristics are described as follows:

[0114] The thickness increase ratio exceeds the corresponding comparison threshold by 10% to 15%;

[0115] The coverage increase ratio exceeds the corresponding alignment threshold by 10% to 20%;

[0116] The change ratio of pH value exceeds ±10% of the corresponding comparison threshold;

[0117] when When , it means that the degree of sea erosion in the area is high and restoration measures are needed;

[0118] The degree of sea erosion is high, and the corresponding characteristics are described as follows:

[0119] The thickness increase ratio exceeds the corresponding comparison threshold by 15% to 25%;

[0120] The coverage increase ratio exceeds the corresponding alignment threshold by 20% to 30%;

[0121] The change ratio of pH value exceeds ±15% of the corresponding comparison threshold;

[0122] when When it is, it means that the degree of marine erosion in the area is very serious and needs to be replaced or repaired on a large scale.

[0123] The degree of sea erosion is very serious, and the corresponding characteristics are described as follows:

[0124] The thickness increase ratio exceeds 25% of the corresponding comparison threshold;

[0125] The coverage increase ratio exceeds 30% of the corresponding comparison threshold;

[0126] The change ratio of pH value exceeds 20% of the corresponding comparison threshold.

[0127] Further explanation: The degradation rate under different value ranges is calculated and analyzed. The specific ranges and degradation rate calculations are as follows:

[0128] Will , , , , Marked as interval 1, interval 2, interval 3, interval 4, interval 5 in sequence; set i∈{1,2,3,4,5}, i represents the i-th interval index;

[0129] Introduction The average values ​​of the crack growth rate, steel corrosion rate and porosity change rate of each area on the concrete structure surface corresponding to the output value of the evaluation index in the i-th interval are marked as , , ; and p in each of the following calculation formulas is the same value p1 or p2 or p3;

[0130] Combination , , , comprehensively forming the degradation rate of each area on the concrete structure surface corresponding to the i-th interval , The calculation formula is as follows:

[0131] ;

[0132] Among them, b1, b2, b3 are the weight coefficients of the corresponding parameters, and ; b1, b2, b3 are determined by the expert group through experimental data and will not be elaborated on;

[0133] The correlation evaluation coefficients of various areas on the surface of the concrete structure are calculated as follows:

[0134] ;

[0135] in, Represents the correlation evaluation coefficient of each area on the surface of the concrete structure, is the output value of the evaluation index corresponding to the i-th interval, is the degradation rate under the output value of the evaluation index corresponding to the i-th interval, and are the means of evaluation index and degradation rate respectively;

[0136] For the crack growth rate:

[0137] If the crack expansion rate is less than 5%, it means that the crack changes in the concrete structure are not obvious and no special treatment is required;

[0138] If the crack growth rate is between 5% and 10% (including only the left end value of 5%), it means that the crack growth rate is moderate and needs detailed inspection and minor repair;

[0139] If the crack growth rate is between 10% and 20% (including only the left endpoint value of 10%), the crack growth rate is high and repair and protection measures are required;

[0140] If the crack growth rate is above 20%, it means that the crack growth rate is high and large-scale repairs are needed immediately;

[0141] For steel corrosion rate:

[0142] If the steel corrosion rate is below 5%, it means that the steel corrosion rate is low, the steel corrosion change is not obvious, and no special treatment is required;

[0143] If the steel bar corrosion rate is between 5% and 10% (including only the left end value of 5%), it means that the steel bar corrosion rate is moderate and detailed inspection and protective measures are required;

[0144] If the steel bar corrosion rate is between 10% and 15% (including only the left endpoint value 10%), it means that the steel bar corrosion rate is high and protection and repair measures are needed;

[0145] If the steel corrosion rate is above 15%, the steel corrosion rate is high and large-scale protection and repair are required immediately;

[0146] For the porosity change rate:

[0147] If the porosity change rate is less than 5%, it means that the porosity change rate is low, the concrete porosity change is not obvious, and no special treatment is required;

[0148] If the porosity change rate is between 5% and 10% (including only the left end value of 5%), it means that the porosity change rate is moderate and needs to be inspected and repaired in detail;

[0149] If the porosity change rate is above 10%, it means that the porosity change rate is high and large-scale repair and pore plugging are required immediately.

[0150] Further explanation: the correlation evaluation coefficient is used to evaluate the correlation degree of the degradation rate of each area on the surface of the concrete structure under different evaluation index output values. The degradation rate includes the crack propagation rate, the steel corrosion rate, and the porosity change rate, specifically including:

[0151] The correlation coefficient is taken as hour:

[0152] There is a high degree of correlation between the evaluation index and the crack growth rate; when the evaluation index increases, the crack growth rate also increases; if the evaluation index increases from 10% to 50%, the crack growth rate increases from 5% to 15%;

[0153] There is a high degree of correlation between the evaluation index and the steel corrosion rate; if the evaluation index increases from 20% to 70%, the steel corrosion rate increases from 5% to 12%;

[0154] There is a high degree of correlation between the evaluation index and the porosity change rate; if the evaluation index increases from 30% to 80%, the porosity change rate increases from 5% to 10%;

[0155] The correlation coefficient is taken as hour;

[0156] There is a moderate correlation between the evaluation index and the crack growth rate; if the evaluation index increases from 10% to 50%, the crack growth rate increases from 5% to 10%;

[0157] There is a moderate correlation between the evaluation index and the steel corrosion rate; if the evaluation index increases from 20% to 70%, the steel corrosion rate increases from 5% to 10%;

[0158] There is a moderate correlation between the evaluation index and the porosity change rate; if the evaluation index increases from 30% to 80%, the porosity change rate increases from 5% to 8%;

[0159] The correlation coefficient is taken as hour;

[0160] The correlation between the evaluation index and the crack growth rate is weak; if the evaluation index increases from 10% to 50%, the crack growth rate increases from 5% to 7%;

[0161] The correlation between the evaluation index and the steel corrosion rate is weak; if the evaluation index increases from 20% to 70%, the steel corrosion rate increases from 5% to 8%;

[0162] The correlation between the evaluation index and the porosity change rate is weak; if the evaluation index increases from 30% to 80%, the porosity change rate increases from 5% to 6%;

[0163] The negative correlation coefficient is hour;

[0164] There is a negative correlation between the evaluation index and the crack growth rate, which means that when the evaluation index increases, the crack growth rate decreases; if the evaluation index increases from 50% to 70%, the crack growth rate decreases from 10% to 8%;

[0165] There is a negative correlation between the evaluation index and the steel corrosion rate, which means that when the evaluation index increases, the steel corrosion rate decreases; if the evaluation index increases from 50% to 70%, the steel corrosion rate decreases from 10% to 7%;

[0166] There is a negative correlation between the evaluation index and the porosity change rate, which means that when the evaluation index increases, the porosity change rate decreases. If the evaluation index increases from 50% to 70%, the porosity change rate decreases from 10% to 5%.

[0167] Further explanation: Combining the evaluation index and correlation evaluation coefficient of each area on the surface of the concrete structure, a comprehensive evaluation model for predicting the life of each area on the surface of the concrete structure is constructed, which specifically includes:

[0168] based on , the evaluation indexes corresponding to the wave splash zone, tidal surge zone and full immersion zone are determined as follows: , , ; Determine the correlation evaluation coefficients corresponding to the wave splash zone, tidal surge zone and full immersion zone as follows: , , ;

[0169] For the evaluation index of the splash zone :

[0170] ;

[0171] Tidal Zone Evaluation Index :

[0172] ;

[0173] Total Immersion Area Evaluation Index :

[0174] ;

[0175] Calculate the correlation evaluation coefficient of the wave splash zone :

[0176] ;

[0177] Calculate the correlation evaluation coefficient of tidal surge area :

[0178] ;

[0179] Calculate the correlation evaluation coefficient of the full immersion area :

[0180] ;

[0181] The comprehensive evaluation model for defining the wave splash zone is:

[0182] ;

[0183] The comprehensive evaluation model for tidal surge areas is defined as:

[0184] ;

[0185] The comprehensive evaluation model for the full immersion area is defined as:

[0186] ;

[0187] in, , , They are the evaluation values ​​of the wave splash zone, tidal surge zone and full immersion zone respectively; is the weight coefficient of the corresponding parameter, representing the contribution of the evaluation index and correlation coefficient to life prediction. . The specific values ​​are determined by an expert group through experimental data and will not be elaborated on here.

[0188] Further explanation: the deterioration rate of each area on the surface of the concrete structure is calculated, and based on the deterioration rate of each area, the overall life of the concrete structure is predicted, including:

[0189] Based on the degradation rate of each area on the concrete structure surface in the i-th interval , the comprehensive degradation rate of the wave splash zone is defined as , the calculation formula is as follows:

[0190] ;

[0191] The comprehensive degradation rate of the tidal flood zone is defined as , the calculation formula is as follows:

[0192] ;

[0193] The comprehensive degradation rate of the full immersion area is defined as , the calculation formula is as follows:

[0194] ;

[0195] in, are the coefficients for adjusting the impact of comprehensive evaluation results on degradation rate, ; The specific values ​​are determined by an expert group through experimental data and will not be elaborated on here.

[0196] According to the deterioration rate, the remaining life of each area on the surface of the concrete structure is calculated and a comprehensive evaluation is conducted; the following standards are defined:

[0197] The formula for defining the life of each area on the surface of a concrete structure is:

[0198] ;

[0199] in, is the remaining life, D is the design life, is the deterioration rate of the corresponding concrete structure surface area; , , They represent the remaining life of the sea wave splash zone, tidal surge zone and full immersion zone on the surface of the concrete structure respectively;

[0200] The overall life prediction formula is defined as:

[0201] ;

[0202] in, is the predicted value of the comprehensive life of the concrete structure as a whole, are the area values ​​of the wave splash zone, tidal surge zone and full immersion zone, respectively, and All are processed by normalization, scaling and offset in turn. The value range is (0,1);

[0203] Set the degradation rate comparison threshold to ;

[0204] When the residual life of the concrete structure is more than 80% of the total life, the deterioration rate is less than 20% of the design deterioration rate.

[0205] when When the residual life of the concrete structure is between (60%-80%] of the total life;

[0206] when When the residual life of the concrete structure is between (40%-60%] of the total life;

[0207] when When the residual life of the concrete structure is between (20%-40%] of the total life;

[0208] when When the residual life of the concrete structure is within 20% of the total life.

[0209] Embodiment 2:

[0210] See also Figure 2 , a concrete structure life prediction system based on marine erosion, the system is used to execute the concrete structure life prediction method based on marine erosion, comprising:

[0211] Division and collection unit: used to divide the surface area of ​​the concrete structure into wave splash zone, tidal zone and full immersion zone in accordance with the sea erosion effect, and regularly collect the thickness and coverage of marine biological attachments on each area of ​​the concrete structure surface, as well as the pH value change of the concrete surface under the marine biological attachments, and transmit the collected data to the data processing unit;

[0212] Index generation unit: used to receive the pre-processed thickness, coverage and pH value change data in the wave splash zone, tidal zone and full immersion zone, and analyze and process them respectively to calculate the evaluation index used to evaluate the sea erosion degree of each area on the surface of the concrete structure;

[0213] Correlation analysis unit: used to obtain the historical data of degradation rate of the wave splash zone, tidal zone and full immersion zone under different evaluation index output values, and perform correlation analysis respectively to calculate the correlation evaluation coefficient of each area on the surface of the concrete structure; the correlation evaluation coefficient is used to evaluate the correlation degree of degradation rate of each area on the surface of the concrete structure under different evaluation index output values, and the degradation rate includes crack propagation rate, steel corrosion rate and porosity change rate;

[0214] Comprehensive evaluation model construction unit: used to combine the evaluation index and correlation evaluation coefficient of each area on the surface of the concrete structure to construct a comprehensive evaluation model for life prediction of each area on the surface of the concrete structure;

[0215] Life prediction unit: It is used to input the thickness, coverage and pH value change data of each area on the surface of the concrete structure monitored at the current collection point into the comprehensive evaluation model to calculate the degradation rate of each area on the surface of the concrete structure, and based on the degradation rate of each area, predict the overall life of the concrete structure.

[0216] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0217] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product. Those skilled in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software methods depends on the specific application and design constraints of the technical solution.

[0218] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0219] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A method for predicting the life of concrete structures based on marine erosion, characterized in that: The specific steps include: Step S1: the surface area of ​​the concrete structure is divided into a wave splash zone, a tidal zone and a full immersion zone in turn according to the sea erosion effect, and the thickness and coverage of the marine biological attachments on each area of ​​the concrete structure surface, as well as the pH value change of the concrete surface under the marine biological attachments are collected at regular intervals; The wave splash zone, tidal surge zone and full immersion zone are represented by p1, p2 and p3 respectively; The thickness, coverage and pH value changes of the wave splash zone p1 are marked as , , ; The thickness, coverage and pH value changes of the tidal zone p2 are marked as , , ; The thickness, coverage and pH value changes of the full immersion area p3 are marked as , , ; Step S2: receiving the pre-processed thickness, coverage and pH value change data in the wave splash zone, tidal zone and full immersion zone, and analyzing and processing them respectively to calculate the evaluation index for evaluating the sea erosion degree of each area on the surface of the concrete structure; The establishment principle of setting the comparison threshold is as follows: based on the expert group system, the thickness, coverage and pH value changes of each area on the surface of the concrete structure are determined respectively. The corresponding benchmark values; when any two parameters of thickness, coverage and pH value change remain unchanged, when the change of the third parameter reaches 10% of the corresponding benchmark value, the values ​​reaching 10% of the corresponding benchmark value are used as the comparison threshold; Based on the establishment principle of comparison threshold, the comparison thresholds of thickness, coverage and pH value changes in the wave splash zone, tidal surge zone and full immersion zone are determined respectively; The thickness value corresponding to the comparison threshold is marked as ; Mark the alignment threshold corresponding to the coverage value as ; The comparison threshold corresponding to the pH value change is marked as ; Calculate the change ratio of each parameter in the wave splash zone, tidal surge zone and full immersion zone in turn, and set , and p in each of the following calculation formulas is the same value p1 or p2 or p3; The thickness change ratio is marked as , the calculation formula is: This formula represents the thickness value currently collected Compare with the corresponding threshold The difference percentage of The coverage change ratio is marked as , the calculation formula is: This formula represents the coverage value currently collected Compare with the corresponding threshold The difference percentage of The ratio of the change in pH value is marked as , the calculation formula is: This formula represents the change in the pH value currently collected Compare with the corresponding threshold The difference percentage of The evaluation index of sea erosion degree in each area is calculated based on the change ratio of thickness, coverage and pH value. : in, are the weight coefficients of thickness, coverage and pH value change, ; Step S3: Obtain historical data of degradation rates of the wave splash zone, tidal zone, and full immersion zone under different evaluation index output values, and perform correlation analysis respectively to calculate the correlation evaluation coefficient of each area on the surface of the concrete structure; the correlation evaluation coefficient is used to evaluate the degree of correlation of degradation rates of each area on the surface of the concrete structure under different evaluation index output values, and the degradation rates include crack propagation rate, steel corrosion rate, and porosity change rate; Step S4: combining the evaluation index and the correlation evaluation coefficient of each area on the surface of the concrete structure, constructing a comprehensive evaluation model for predicting the life of each area on the surface of the concrete structure; Step S5: Input the thickness, coverage and pH value change data of each area on the surface of the concrete structure monitored at the current collection point into the comprehensive evaluation model to calculate the degradation rate of each area on the surface of the concrete structure, and based on the degradation rate of each area, predict the overall life of the concrete structure.

2. The method for predicting the life of a concrete structure based on marine erosion according to claim 1, characterized in that: Evaluate the degree of sea erosion in various areas of the concrete structure surface, including: Evaluation Index The valid value range of is -100% to 100%; any area in the wave splash zone, tidal zone and full immersion zone is represented by "this area"; the evaluation index The evaluation contents at different output values ​​are as follows: when When , it means that the thickness, coverage or pH value changes in the area show negative growth, and each parameter is less than the corresponding comparison threshold, indicating that the degree of sea erosion of the concrete structure in the area is less than 10%; when When , it means that the degree of sea erosion in the area is relatively low and the concrete structure is in good condition; when When , it means that the degree of marine erosion in the area is moderate and monitoring and maintenance are needed; when When , it means that the degree of sea erosion in the area is high and restoration measures are needed; when When it is, it means that the degree of marine erosion in the area is very serious and needs to be replaced or repaired on a large scale.

3. The method for predicting the life of a concrete structure based on marine erosion according to claim 2, characterized in that: Evaluation Index The degradation rate under different value ranges is calculated and analyzed. The specific ranges and degradation rate calculations are as follows: Will , , , , Marked as interval 1, interval 2, interval 3, interval 4, interval 5 in sequence; set i∈{1,2,3,4,5}, i represents the i-th interval index; Introduction The average values ​​of the crack growth rate, steel corrosion rate and porosity change rate of each area on the concrete structure surface corresponding to the output value of the evaluation index in the i-th interval are marked as , , ; and p in each of the following calculation formulas is the same value p1 or p2 or p3; Combination , , , comprehensively forming the degradation rate of each area on the concrete structure surface corresponding to the i-th interval , The calculation formula is as follows: Among them, b1, b2, b3 are the weight coefficients of the corresponding parameters, and ; The correlation evaluation coefficients of various areas on the surface of the concrete structure are calculated as follows: in, Represents the correlation evaluation coefficient of each area on the surface of the concrete structure, is the output value of the evaluation index corresponding to the i-th interval, is the degradation rate under the output value of the evaluation index corresponding to the i-th interval, and are the means of evaluation index and degradation rate respectively.

4. The method for predicting the life of a concrete structure based on marine erosion according to claim 3, characterized in that: The correlation evaluation coefficient is used to evaluate the correlation degree of the degradation rate of each area on the surface of the concrete structure under different evaluation index output values. The degradation rate includes the crack propagation rate, the steel corrosion rate, and the porosity change rate, including: The correlation coefficient is taken as When: the evaluation index has a high degree of correlation with the crack growth rate, steel corrosion rate, and porosity change rate; The correlation coefficient is taken as When; there is a moderate correlation between the evaluation index and the crack growth rate, steel corrosion rate, and porosity change rate; The correlation coefficient is taken as When; there is a weak correlation between the evaluation index and the crack growth rate, steel corrosion rate, and porosity change rate; The negative correlation coefficient is The evaluation index is negatively correlated with the crack propagation rate, steel bar corrosion rate, and porosity change rate.

5. The method for predicting the life of a concrete structure based on marine erosion according to claim 4, characterized in that: Combining the evaluation index and correlation evaluation coefficient of each area on the surface of the concrete structure, a comprehensive evaluation model for life prediction of each area on the surface of the concrete structure is constructed, including: based on , the evaluation indexes corresponding to the wave splash zone, tidal surge zone and full immersion zone are determined as follows: , , ; Determine the correlation evaluation coefficients corresponding to the wave splash zone, tidal surge zone and full immersion zone as follows: , , ; The comprehensive evaluation model for defining the wave splash zone is: The comprehensive evaluation model for tidal surge areas is defined as: The comprehensive evaluation model for the full immersion area is defined as: in, , , They are the evaluation values ​​of the wave splash zone, tidal surge zone and full immersion zone respectively; is the weight coefficient of the corresponding parameter, .

6. The method for predicting the life of a concrete structure based on marine erosion according to claim 5, characterized in that: Calculate the deterioration rate of each area on the surface of the current concrete structure, and based on the deterioration rate of each area, predict the overall life of the concrete structure, including: Based on the degradation rate of each area on the concrete structure surface in the i-th interval , the comprehensive degradation rate of the wave splash zone is defined as , the calculation formula is as follows: The comprehensive degradation rate of the tidal flood zone is defined as , the calculation formula is as follows: The comprehensive degradation rate of the full immersion area is defined as , the calculation formula is as follows: in, are the coefficients for adjusting the impact of comprehensive evaluation results on degradation rate, ; According to the deterioration rate, the remaining life of each area on the surface of the concrete structure is calculated and a comprehensive evaluation is performed; the following standards are defined: The formula for defining the life of each area on the surface of a concrete structure is: in, is the remaining life, D is the design life, is the deterioration rate of the corresponding concrete structure surface area; , , They represent the remaining life of the sea wave splash zone, tidal surge zone and full immersion zone on the surface of the concrete structure respectively; The overall life prediction formula is defined as: in, is the predicted value of the comprehensive life of the concrete structure as a whole, are the area values ​​of the wave splash zone, tidal surge zone and full immersion zone, respectively, and All are processed by normalization, scaling and offset in turn. The value range is (0,1).

7. A concrete structure life prediction system based on marine erosion, characterized by: The system is used to execute the method for predicting the life of a concrete structure based on marine erosion according to any one of claims 1 to 6, comprising: Division and collection unit: used to divide the surface area of ​​the concrete structure into wave splash zone, tidal zone and full immersion zone in accordance with the sea erosion effect, and regularly collect the thickness and coverage of marine biological attachments on each area of ​​the concrete structure surface, as well as the pH value change of the concrete surface under the marine biological attachments, and transmit the collected data to the data processing unit; Index generation unit: used to receive the pre-processed thickness, coverage and pH value change data in the wave splash zone, tidal zone and full immersion zone, and analyze and process them respectively to calculate the evaluation index used to evaluate the sea erosion degree of each area on the surface of the concrete structure; Correlation analysis unit: used to obtain the historical data of degradation rate of the wave splash zone, tidal zone and full immersion zone under different evaluation index output values, and perform correlation analysis respectively to calculate the correlation evaluation coefficient of each area on the surface of the concrete structure; the correlation evaluation coefficient is used to evaluate the correlation degree of degradation rate of each area on the surface of the concrete structure under different evaluation index output values, and the degradation rate includes crack propagation rate, steel corrosion rate and porosity change rate; Comprehensive evaluation model construction unit: used to combine the evaluation index and correlation evaluation coefficient of each area on the surface of the concrete structure to construct a comprehensive evaluation model for life prediction of each area on the surface of the concrete structure; Life prediction unit: It is used to input the thickness, coverage and pH value change data of each area on the surface of the concrete structure monitored at the current collection point into the comprehensive evaluation model to calculate the degradation rate of each area on the surface of the concrete structure, and based on the degradation rate of each area, predict the overall life of the concrete structure.

Images