CN107341282B - Improved bridge deterioration evaluation method based on previous year technical state - Google Patents
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Abstract
The invention discloses an improved natural deterioration evaluation method based on the technical state of a bridge in the previous year, which adopts 4 parameters of technical state scoring during bridge construction, time for non-deterioration of the technical state of the bridge, statistical service life of the same type of bridge and service time of the bridge in operation to establish a bridge technical state deterioration process model which can describe the change of environment, load and material characteristics after the bridge construction enters the operation period. The bridge technical state deterioration model is used for bridge technical state evaluation and prediction, the bridge can be detected, maintained and reinforced in a targeted manner, the rationality of maintenance, reinforcement and modification scales is ensured, the bridge is kept in a good technical state, and the bridge state deterioration model has important significance for bridge structure safety, sustainable operation and social and economic development.
Description
Technical Field
The invention belongs to the field of bridge detection, evaluation and maintenance, and particularly relates to an improved bridge degradation evaluation method based on the technical state of the previous year.
Background
The bridge is subjected to the processes of construction, service, function degradation and scrapping. During the use, under the action of internal or external or natural adverse factors, the aging of materials and structural damage occur, the accumulation of the damage can cause the degradation of structural performance and the reduction of reliability, and the function of the material can be accelerated without maintenance and reinforcement. Because the bridge is made of basic materials such as steel, concrete and the like, through statistical analysis, the degradation of the newly-built and in-service bridge has similar rules, and the research and prediction of the future reliability and state of the bridge are very important. In order to better predict the service state and the residual life of the bridge, many scholars at home and abroad research a reliability degradation model of the bridge structure, but the information and documents about the technical state degradation model of the bridge structure are less.
For a concrete bridge structure, two-section and three-section linear degradation models and n-section linear and nonlinear degradation models are established by combining an effective function according to a paper ' concrete bridge degradation model research ' published in the journal of China and foreign highways ', parameter values are given by combining national specifications and standard analysis, and a basic two-section nonlinear model expression formula (1) is shown when no maintenance is carried out.
β(t)＝β。-α(t-tI)F(tI) (1)
In the formula (1), β represents the initial reliability of the bridge structure construction, tIThe time of the bridge structure starting to deteriorate is measured in years, α is the structure reliability deterioration rate when the bridge structure is not maintained, and the bridge deterioration model enables maintenance decision work to be more concise and convenient.
For example, in a paper published in journal of world bridge, "optimization research of steel bridge maintenance strategy based on performance degradation analysis" comprehensively considers influence factors such as environment and load, uses reliability index and state index to represent bridge technical state, introduces improved Logistic dynamic particle swarm optimization algorithm and Monte-Carlo simulation, provides a primary and secondary nonlinear degradation model of reliability index and state index in the service process of the bridge, and establishes a time-varying reliability index calculation model formula (2) of the bridge structure:
in the formula (2), β represents the initial reliability of the bridge structure, tIThe time for the bridge structure to begin to deteriorate is taken as a unit of year; eIAs environmental influence factor, SEα is equivalent damage factor1The reliability index damage accumulation coefficient is determined according to the structural stress state and the traffic development condition.
For example, in a paper published in journal of railway science and engineering journal, namely a deteriorated bridge probability maintenance model and maintenance scheme cost optimization research, a nonlinear model of the following bridge technical state indexes is established:
in formula (3): C. establishing an initial state index for the bridge structure; t is tCIα is the time of beginning deterioration of bridge state index in years2The deterioration rate of the bridge structure.
The model can be used for not only newly built bridges but also old bridges in service for years, but the deviation between the estimated value and the actual value of the degradation model is large, so that the accuracy and the reliability of the evaluation work are not high enough. In order to accurately evaluate and predict the technical state of the bridge, the bridge can be detected, maintained and reinforced in a targeted manner, the aim of manpower and material resources is achieved, the rationality of scale of maintenance, reinforcement and modification is ensured, the bridge is kept in a good technical state, the service life of the bridge is prolonged to a certain extent, and the method has important practical significance and practical significance for the safe life of the bridge, sustainable operation and social and economic development. Therefore, in order to solve the above problems, a method for evaluating the deterioration of the technical state of the bridge is urgently needed so as to record, describe and predict the deterioration rule of the technical state of the bridge.
Disclosure of Invention
In order to improve the problems of bridge technical state evaluation and prediction precision, the improved natural deterioration evaluation method based on the bridge technical state in the previous year adopts an exponentially-changed nonlinear function expression as a bridge technical state deterioration model to describe the deterioration rule of the bridge technical state; the invention is realized by the following technical scheme:
an improved natural deterioration assessment method based on the technical state of a bridge in the previous year, which is used for evaluating the deterioration of the bridge state on the basis of the data of the technical state score, the time of no deterioration of the technical state of the bridge, the statistical service life of the bridge of the same type and the service life of the bridge, and comprises the following steps:
step a, obtaining an initial technical state score D when a bridge is builtcTime N for no deterioration of bridge technical statecThe service time n of the bridge and the service state scores D (1), D (2) and D (3) … D (n) of the bridge within the service time n;
step b, calculating the deterioration rate α of the bridge technical state;
c, calculating according to the deterioration rate α and counting the service life N of the bridges of the same typedCalculating the value of the power A in the degradation model;
d, determining a degradation model of the bridge according to the parameters obtained in the steps a to c, drawing a technical state degradation curve, and finishing degradation evaluation; the degradation model is as follows:
wherein: dcScoring an initial technical state of a bridge as it is being built、NdAnd counting the service life of the same type of bridge, wherein n is the service time, A is the power, and D (n-1) is the technical state score of the bridge in the previous year.
When the service time of the bridge after construction is n years, according to the technical state scores D (1), D (2) and D (3) … D (n) of the bridge in the past years, if the evaluation time of the past years is continuous, the technical state degradation rate α of the beam is calculated according to the formula (5), and if the evaluation time of the past years is discontinuous, the technical state degradation rate α of the beam is calculated according to the formula (6):
α＝max{D(1)-D(2),D(2)-D(3),...,D(n-1)-D(n)} (5)
wherein: d (1) is the technical state score when the service time of the bridge is 1 year, D (2) is the technical state score when the service time of the bridge is 2 years, D (3) is the technical state score when the service time of the bridge is 3 years, D (j) is the technical state score when the service time of the bridge is j years, D (k) is the technical state score when the service time of the bridge is k years, D (n-1) is the technical state score of the bridge in (n-1) years, and D (n) is the technical state score when the service time of the bridge is n years.
Statistical service life N of bridges of the same typedThe statistical service life N of the concrete bridge is determined as followsdTaking values for 40 years; statistical service life N of concrete bridgedTaking a value for 55 years; statistical service life N of concrete bridgedTaking the value for 80 years; statistical service life N of concrete grand bridgedTaking the value for 100 years.
Not considering N in the model for evaluating the technical state of the bridge based on the previous year or the last timecIn the process, A is related to the maximum attenuation rate α of the bridge technical state degradation, the value relation of A and α is shown in table 1, and interpolation calculation can be carried out according to table 1.
TABLE 1 bridge technical state degradation rate α, power A, statistical service life NdRelation table
The power A is related to the maximum attenuation rate α of the bridge technology state degradation, and a certain power A can be selected to calculate the attenuation rate α of the technology state degradation according to the following method.
When the service life N of the same type of bridge is counteddAnd when the value is 40 years, the value relation between A and α is determined according to the following formula, and the value of A is determined according to the following formula:
α＝-0.0098A5+0.1958A4-1.57A3+6.4224A2-13.141A+17.16 (7)
when the service life N of the same type of bridge is counteddWhen the value is 55 years, the value relation between A and α is determined according to the following formula, and the value of A is determined according to the following formula:
α＝-0.0044A5+0.101A4-0.9274A3+4.3025A2-0.9473A+13.95 (8)
when the service life N of the same type of bridge is counteddAnd when the value is 80 years, the value relation between A and α is determined according to the following formula, and the value of A is determined according to the following formula:
α＝-0.0051A5+0.112A4-0.9745A3+4.2864A2-9.4767A+12.28 (9)
when the service life N of the same type of bridge is counteddWhen the value is 100 years, the value relation between A and α is determined according to the following formula, and the value of A is determined according to the following formula:
α＝-0.0038A5+0.0849A4-0.7621A3+3.4664A2-7.9519A+10.602 (10)
α is the degradation rate of the bridge technology state, and A is the power of the degradation model.
And e, calculating a bridge technical state evaluation predicted value according to the bridge degradation model, evaluating the service life interval of the bridge at present, predicting a bridge maintenance time node according to the bridge technical state maintenance critical point, and detecting, maintaining and reinforcing the bridge at the service life interval and the time node corresponding to the bridge.
The invention has the advantages that:
based on a large amount of statistical analysis and research of bridge technical state data, through parameter sensitivity analysis, the bridge technical state evaluation prediction parameters are scientifically selected, the problem that the precision of a degradation evaluation model in the prior art is not high is solved, and high-precision evaluation and bridge technical state prediction can be realized; the bridge can be detected, maintained and reinforced in a targeted manner according to the bridge technical state evaluation value, so that the bridge keeps a good technical state, and the service life of the bridge is effectively prolonged.
Drawings
Fig. 1 is a schematic diagram of a bridge technology state degradation curve in the degradation evaluation method of the present invention.
Detailed Description
The technical state of a concrete continuous beam bridge is tracked for a long time, the total length of the bridge is 75m, the upper part of the bridge is constructed into a 3 multiplied by 25m concrete cast-in-place continuous box beam, the height of the beam is 1.5m, and the width of the beam is 11.20 m; the abutment is a gravity abutment, the pier is a column pier, and both the pier foundation and the platform foundation are enlarged foundations; the bridge deck pavement layer in the bridge deck system is a cement concrete surface layer, the guardrails are steel pipe guardrails, and the bridge deck is provided with water drainage holes; the bridge is built into a general train in 1988, and the bridge age is 22 years in 2009; according to the appearance inspection result in the process of handing over and checking, determining the initial technical state score Dc of the bridge to be 95 points; the bridge was evaluated by 4 tests during 22 years, the initial bridge building time in 1988, the test evaluation times in 1997, 2001, 2005 and 2009, respectively, the technical status scoring results D (1) ═ Dc 95, D (10) ═ 90, D (14) ═ 85, D (18) ═ 76, D (22) ═ 55, and the evaluation times and results are shown in table 2.
TABLE 2 evaluation time and technical status evaluation results
The maximum bridge technical state degradation rate α can be 5.1 in 22 years by substituting the technical state scoring result into formula (6), and the service life N is counted because of the bridge in the bridge deck concretedTaking a value for 55 years, and calculating according to the formula (8) to obtain the degradation model parameter with the power A of 3.0; scoring the initial technical state Dc, service life NdSubstitution of power AEquation (4) can give the following degradation model expression:
drawing a degradation evaluation curve of the model expression, as shown in fig. 1, the relationship between the technical state and the service life of the bridge can be known from the graph, and the estimated predicted value of the technical state of the bridge reaches 50 when the service life of the bridge is 25 years (i.e. 2012), which needs to be reinforced; when the service life is 29 years (namely 2016), the technical state evaluation predicted value reaches 30, and major repair is required.
Claims (8)
1. The improved natural deterioration evaluation method based on the bridge technical state in the previous year is characterized in that the evaluation method carries out the bridge state deterioration evaluation on the basis of the data of the technical state score, the time that the bridge technical state is not deteriorated, the statistical service life of bridges of the same type and the service life of the bridges, which are calculated in the previous year, of the bridge, and the evaluation method is characterized in that: the evaluation method comprises the following steps:
step a, obtaining an initial technical state score D when a bridge is builtcTime N for no deterioration of bridge technical statecThe service time n of the bridge and the service state scores D (1), D (2) and D (3) … D (n) of the bridge within the service time n;
step b, calculating the deterioration rate α of the bridge technical state;
c, calculating according to the deterioration rate α and counting the service life N of the bridges of the same typedCalculating the value of the power A in the degradation model;
d, determining a degradation model of the bridge according to the parameters obtained in the steps a to c, drawing a technical state degradation curve, and finishing degradation evaluation; the degradation model is as follows:
wherein: dcScoring the initial technical state of the bridge as it is being built, NdCounting the service life of the same type of bridge, n is the service time, A isPower, D (n-1) is the technical state score of the bridge in the previous year;
and e, calculating a bridge technical state evaluation predicted value according to the bridge degradation model, evaluating the service life interval of the bridge at present, predicting a bridge maintenance time node according to the bridge technical state maintenance critical point, and maintaining, maintaining and reinforcing the bridge at the service life interval and the time node corresponding to the bridge.
2. The improved natural deterioration evaluation method based on the bridge technical state in the previous year according to claim 1, wherein when the service time of the bridge is n years, the score of the bridge technical state in n years is obtained, and when the evaluation time in n years is continuous, the deterioration rate α of the bridge technical state is determined according to the following formula:
α＝max{D(1)-D(2),D(2)-D(3),...,D(n-1)-D(n)}
wherein: d (1) is the technical state score when the bridge is used for 1 year, D (2) is the technical state score when the bridge is used for 2 years, D (3) is the technical state score when the bridge is used for 3 years, D (n-1) is the technical state score when the bridge is used for the (n-1) th year, and D (n) is the technical state score when the bridge is used for the n-th year.
3. The improved natural deterioration evaluation method based on the bridge technical state in the previous year according to claim 1, wherein when the service time is n years, the score of the bridge technical state in n years is obtained, and when the evaluation time in n years is not continuous, the bridge technical state deterioration rate α is determined according to the following formula:
wherein: d (1) is the technical state score when the service time of the bridge is 1 year, D (2) is the technical state score when the service time of the bridge is 2 years, D (3) is the technical state score when the service time of the bridge is 3 years, D (j) is the technical state score when the service time of the bridge is j years, D (k) is the technical state score when the service time of the bridge is k years, D (n-1) is the technical state score of the bridge in (n-1) years, and D (n) is the technical state score when the service time of the bridge is n years.
4. The improved natural deterioration assessment method based on the previous year bridge technology state according to claim 1, characterized in that: statistical service life N of bridges of the same typedThe determination is carried out as follows; statistical service life N of concrete bridgedTaking values for 40 years; statistical service life N of concrete bridgedTaking a value for 55 years; statistical service life N of concrete bridgedTaking the value for 80 years; statistical service life N of concrete grand bridgedTaking the value for 100 years.
5. The improved natural deterioration assessment method based on the previous year bridge technology state according to claim 4, characterized in that: statistical service life N of bridges of the same typedAnd when the value is 40 years, the value of A is determined according to the following formula:
α＝-0.0098A5+0.1958A4-1.57A3+6.4224A2-13.141A+17.16
α is the degradation rate of the bridge technology state, and A is the power of the degradation model.
6. The improved natural deterioration assessment method based on the previous year bridge technology state according to claim 1 or 3, characterized in that: statistical service life N of bridges of the same typedWhen the value is 55 years, the value of A is determined according to the following formula:
α＝-0.0044A5+0.101A4-0.9274A3+4.3025A2-0.9473A+13.95
α is the degradation rate of the bridge technology state, and A is the power of the degradation model.
7. The improved natural deterioration assessment method based on the previous year bridge technology state according to claim 4, characterized in that: statistical service life N of bridges of the same typedValue 80And (3) determining the value of A according to the following formula in year, and determining the value of A according to the following formula:
α＝-0.0051A5+0.112A4-0.9745A3+4.2864A2-9.4767A+12.28
α is the degradation rate of the bridge technology state, and A is the power of the degradation model.
8. The improved natural deterioration assessment method based on the previous year bridge technology state according to claim 4, characterized in that: statistical service life N of bridges of the same typedWhen the value is 100 years, the value of A is determined according to the following formula:
α＝-0.0038A5+0.0849A4-0.7621A3+3.4664A2-7.9519A+10.602
α is the degradation rate of the bridge technology state, and A is the power of the degradation model.
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| CN101451338A (en) * | 2008-07-31 | 2009-06-10 | 重庆大学 | Separation method of bridge structural state historical information |
| CN101696912A (en) * | 2009-11-02 | 2010-04-21 | 重庆交通大学 | Method for health diagnosis of concrete bridge structure based on statistical indexes |
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