CN109271662B - Bridge pile foundation health state assessment method based on real-time monitoring data processing - Google Patents
Bridge pile foundation health state assessment method based on real-time monitoring data processing Download PDFInfo
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Abstract
The invention relates to a bridge pile foundation health state assessment method based on real-time monitoring data processing, and compared with the prior art, the method solves the problem that the health state of a bridge pile foundation cannot be effectively assessed. The invention comprises the following steps: acquiring original scouring real-time monitoring data; simplified processing of the scour real-time monitoring data; establishing a dynamic real-time pile foundation scouring finite element evaluation model; and evaluating the health state of the bridge pile foundation. The method can quickly and effectively utilize real-time monitoring data to evaluate the health state of the bridge pile foundation.
Description
Technical Field
The invention relates to the technical field of big data processing, in particular to a bridge pile foundation health state assessment method based on real-time monitoring data processing.
Background
The bridge is an important transportation junction, and the healthy operation of the bridge has great promotion effects on traffic operation safety, life of people and social and economic benefits. At present, a plurality of bridges adopt pile foundations in China, wherein a plurality of bridges are erected in sea areas with severe water conditions, and scouring is an important factor causing instability of pile foundations and bridge damage in a long-term operation process, for example, in 2008, a jiaxian bridge in GaoXian county of Taiwan leads to collapse and looseness of piers and collapse of bridge floors and incapability of passing through and bridge sealing due to scouring of Yanshan river water; in 2010, the main bridge pier of the bridge is partially collapsed due to the fact that the foundation of the bridge is locally scoured by flood water through the Sichuan Hua Yangtong.
Therefore, the safety of the bridge pile foundation is an important index for reflecting the overall safety of the bridge, and if the health state of the bridge pile foundation can be evaluated in real time, the bridge pile foundation can be maintained and repaired in time, so that a lot of bridge accidents can be avoided. The potential safety hazard that the bridge pile foundation exists is hardly found, but with the help of numerous bridge pile foundation real-time supervision equipment of kind, just can realize the real-time aassessment to bridge pile foundation health status.
In recent years, with the rapid development of information technology, the practice of processing real-time monitoring data by using a computer has become more common. How to filter and integrate huge and complex real-time monitoring data and evaluate the health state of the bridge pile foundation by using the integrated data becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a method for rapidly and effectively evaluating the health state of a bridge pile foundation by using real-time monitoring data, and solves the problem that the health state of the bridge pile foundation is difficult to effectively evaluate by using the real-time monitoring data.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a bridge pile foundation health state assessment method based on real-time monitoring data processing is characterized by comprising the following steps:
1) Acquiring original scouring real-time monitoring data; reading original flushing real-time monitoring data acquired by displacement meters, pressure sensors, underwater pile side flow velocity meters and underwater flushing pit depth monitoring equipment which are installed and distributed on a pier top support in real time, wherein the original flushing real-time monitoring data comprise vertical load and bending moment at the pier top displacement and the support, pile side water flow velocity and pile foundation flushing pit depth, and are stored in an array form and defined as unprograta { { u 1, N1, M1, V1, H1, time } { u 2, N2, M2, V2, H2, time } … { u n, N n, M n, V n, H n, time } };
2) Simplified processing of the scour real-time monitoring data; defining a certain time period such as hours, days, weeks and months as basic time units for monitoring, taking days, namely 24 hours as the basic time units, and simplifying data obtained by monitoring equipment and sensors within 24 hours; data u a were obtained, representing pier top displacement within 24 hours; obtaining data N a and M a which represent vertical load and bending moment at the support within 24 hours; obtaining data V a which represents the water flow rate of the pile side in 24 hours; obtaining data H a which represents the depth of the pile foundation scoured pit within 24 hours; flushing real-time monitoring data of the same day are stored in an array form, i array after simplified processing is arranged according to time sequence to form a sequence definition prodata { { u 1, N1, M1, V1, H1, day } { u 2, N2, M2, V2, H2, day } … { u i, N i, M i, V i, H i, day } };
3) Establishing a dynamic real-time pile foundation scouring finite element evaluation model; establishing an initial underwater topography and a bridge pile foundation model according to the shape of a bridge pier and the distribution of pile foundation soil layers, combining the simplified and processed scouring real-time monitoring data in the step 2) along with the scouring change of the pile foundation soil layers, simulating the real-time change of the boundary conditions of the bridge pile foundation under the scouring action, and establishing a dynamic real-time pile foundation scouring finite element evaluation model to simulate the dynamic scouring process of the bridge pile foundation;
4) Evaluating the health state of the bridge pile foundation; carrying out numerical analysis on the bridge pile foundation by means of the dynamic real-time pile foundation scouring finite element evaluation model in the step 3); inputting a design transverse load as external excitation to the finite element evaluation model, wherein the design transverse load acts on the top of the pile foundation, outputting pier top displacement after the finite element evaluation model is operated and analyzed, and comparing the pier top displacement, namely the pier top displacement under the action of scouring and external excitation coupling, with a pier top displacement allowable value specified by a standard to obtain the health state of the bridge pile foundation and carrying out grading evaluation.
The method for evaluating the health state of the bridge pile foundation based on the real-time monitoring data processing is characterized in that the monitoring data are filtered because the monitoring equipment is electronic equipment and system errors are inevitable in the step 1) of obtaining the original scour real-time monitoring data; and setting a normal value threshold of the monitoring data, including an upper value limit and a lower value limit, so as to determine a normal value range of the monitoring data, and filtering the monitoring data out of the normal value range in the unprograta array.
The bridge pile foundation health state evaluation method based on real-time monitoring data processing is characterized in that the simplified processing of the flushing real-time monitoring data in the step 2) is implemented by the following calculation method:
the method for evaluating the health state of the bridge pile foundation based on real-time monitoring data processing is characterized in that the health state of the bridge pile foundation is evaluated in the step 5), the health state score is defined as F, and the calculation formula is as follows:
wherein, F: scoring the health condition of the pile foundation, wherein the total score is 100 points;
[ U ]: pier top displacement tolerance;
u: the resulting pier top displacement was numerically analyzed.
The beneficial effects of the invention are: the method has the advantages that huge and redundant real-time monitoring data are simpler and easier to use, the simplified real-time monitoring data are utilized, and a dynamic, traceable and updatable pile foundation scouring finite element evaluation model can be established by combining CFD software, so that the safety performance of the bridge pile foundation is integrally evaluated, the quantitative damage degree of the pile foundation structure is given, and the current health condition of the bridge pile foundation is quickly and effectively judged.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of a finite element evaluation model of the present invention;
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the method for evaluating a bridge erosion pit based on real-time monitoring data processing according to the present invention includes the following steps:
the method comprises the steps of firstly, acquiring original scouring real-time monitoring data, reading original scouring real-time monitoring data acquired by a displacement meter and a pressure sensor for installing and distributing pier top supports, a pile side flow velocity meter in water and underwater scouring pit depth monitoring equipment in real time, wherein the original scouring real-time monitoring data comprises pier top displacement, vertical load and bending moment at the supports, pile side water flow velocity and pile foundation scouring pit depth, and storing the original scouring real-time monitoring data in an array form, wherein the original scouring real-time monitoring data is defined as unprata { { u 1, N1, M1, V1, H1, time } { u 2, N2, M2, V2, H2, time } … { u n, N n, M n, V n, H n, time } }. Because the monitoring device is an electronic device, system errors are inevitable, and therefore monitoring data are filtered. And setting a normal value threshold of the monitoring data, including an upper value limit and a lower value limit, wherein the upper value limit can be set to be +50, and the lower value limit can be set to be-50, so that the normal value range of the monitoring data is determined to be (-50, + 50), and the monitoring data outside the normal value range in the unprogradac array is filtered.
And secondly, simplifying the flushing real-time monitoring data, wherein the data quantity obtained by flushing real-time monitoring is huge and complicated, so that the group of unprogrammatic data is simplified. The 24-hour or day is defined as a basic time unit for monitoring, and data obtained by monitoring equipment and sensors in 24 hours is simplified. The simplified processing of the real-time monitoring data of the scouring is realized by the following calculation method:
wherein u a: average pier top displacement within 24 hours
N a: average vertical load at the pier top supporting seat within 24 hours;
m a: average bending moment at the pier top support seat within 24 hours;
v a: the average flow velocity of water flow at the side of the pile within 24 hours;
h a: the average depth of the pile foundation scour pits within 24 hours.
Data u a was obtained, representing pier top displacement within 24 hours; obtaining data N a and M a which represent vertical load and bending moment at the support within 24 hours; data V a were obtained, representing the pile side water flow rate over 24 hours; data H a was obtained, representing the pile foundation scour pit depth over a 24 hour period. Flushing real-time monitoring data on the same day are stored in an array form, i arrays after simplified processing are arranged in time sequence to form a sequence defined as prodata { { u 1, N1, M1, V1, H1, day } { u 2, N2, M2, V2, H2, day } … { u i, N i, M i, V i, H i, day } };
and thirdly, establishing a dynamic real-time finite element evaluation model of pile foundation scouring, wherein according to the existing bridge and culvert foundation data, including the shapes of bridge piles of bridge piers and the distribution of pile foundation soil layers, an initial underwater topography and a bridge pile foundation model can be established, along with the erosion change of the pile foundation soil layers, the real-time monitoring data of scouring after simplification processing is combined, namely the real-time parameters of the bridge pile foundation in three spaces underwater in water on water specifically comprise counter force N and bending moment M at a pier top support seat, pier top displacement u, load F uniformly distributed on pile side water flow and the depth H of a scouring pit, and the real-time change of the boundary condition of the bridge pile foundation can be simulated under the scouring action, so that the real-time dynamic finite element evaluation model of the bridge pile foundation is established. The bridge pile foundation parameters obtained through monitoring are related to time, tracking performance, dynamic performance and updatability are achieved, the pile foundation scouring finite element evaluation model can be adjusted along with time, and the dynamic scouring process of the bridge pile foundation is simulated.
And fourthly, evaluating the health state of the bridge pile foundation. The pier top displacement allowable value specified in basic specification of railway bridge and culvert design (TB 10002.1-99) is selected as a safety index. The method comprises the steps of carrying out numerical analysis on a bridge pile foundation by means of a dynamic real-time pile foundation scouring finite element evaluation model, applying a designed transverse load on the top of the bridge pile foundation as external excitation, carrying out operation analysis to obtain pier top displacement under the scouring and external excitation coupling action, carrying out difference comparison with a standard pier top displacement allowable value, obtaining the health state of the bridge pile foundation, and carrying out grading evaluation. The health condition score is defined as F, and the calculation method is as follows:
wherein, F: scoring the health condition of the pile foundation, wherein the total score is 100 points;
[ U ]: pier top displacement tolerance;
u: the resulting pier top displacement was numerically analyzed.
For the more vivid health status that shows bridge pile foundation, this place can be according to the department of transportation "highway bridge culvert maintenance standard" grade F to bridge pile foundation health status score, specifically as follows:
Claims (4)
1. a bridge pile foundation health state assessment method based on real-time monitoring data processing is characterized by comprising the following steps:
1) Acquiring original scouring real-time monitoring data; reading original scouring real-time monitoring data obtained by displacement meters, pressure sensors, underwater pile side flow velocity meters and underwater scouring pit depth monitoring equipment which are installed and distributed on a pier top support in real time, wherein the original scouring real-time monitoring data comprise pier top displacement, vertical load and bending moment at the support, pile side water flow velocity and pile foundation scouring pit depth, and the original scouring real-time monitoring data are stored in an array form;
2) Simplified processing of the scour real-time monitoring data; defining a certain time period, taking hours, days, weeks or months as basic time units for monitoring, taking days, namely 24 hours as the basic time units, and simplifying data obtained by monitoring equipment and sensors within 24 hours; obtaining data ua, which represents pier top displacement within 24 hours; obtaining data Na and Ma which represent the vertical load and the bending moment at the support within 24 hours; obtaining data Va representing the flow rate of the pile side water flow within 24 hours; obtaining data Ha which represents the depth of the pile foundation scour pit within 24 hours; storing the scouring real-time monitoring data in the same day in an array form, and arranging the i simplified groups according to the time sequence to form a sequence definition;
3) Establishing a dynamic real-time pile foundation scouring finite element evaluation model; establishing an initial underwater topography and a bridge pile foundation model according to the shape of a bridge pier and the distribution of a pile foundation soil layer, combining the simplified and processed scouring real-time monitoring data in the step 2) with the scouring change of the pile foundation soil layer, simulating the real-time change of the boundary condition of the bridge pile foundation under the scouring action, and establishing a dynamic real-time pile foundation scouring finite element evaluation model to simulate the dynamic scouring process of the bridge pile foundation;
4) Evaluating the health state of the bridge pile foundation; carrying out numerical analysis on the bridge pile foundation by means of the dynamic real-time pile foundation scouring finite element evaluation model in the step 3); inputting a design transverse load as external excitation to the finite element evaluation model, wherein the design transverse load acts on the top of the pile foundation, outputting pier top displacement after the finite element evaluation model is operated and analyzed, and comparing the pier top displacement, namely the pier top displacement under the action of scouring and external excitation coupling, with a pier top displacement allowable value specified by a standard to obtain the health state of the bridge pile foundation and carrying out grading evaluation.
2. The method for evaluating the health state of the bridge pile foundation based on real-time monitoring data processing according to claim 1, wherein in the step 1), the original washing real-time monitoring data is obtained, and the monitoring data is filtered because the monitoring equipment is electronic equipment and system errors are inevitable; and setting a normal value threshold of the monitoring data, including an upper value limit and a lower value limit, so as to determine a normal value range of the monitoring data, and filtering the monitoring data out of the normal value range in the unprograta array.
3. The method for evaluating the health state of the bridge pile foundation based on the real-time monitoring data processing according to claim 1, wherein the simplified processing of the flushing real-time monitoring data in the step 2) is as follows:
4. the method for evaluating the health state of the bridge pile foundation based on the real-time monitoring data processing according to claim 1, wherein the health state of the bridge pile foundation is evaluated in the step 4), a health state score is defined as F, and a calculation formula is as follows:
wherein, F: scoring the health condition of the pile foundation, wherein the total score is 100 points;
[ U ]: pier top displacement tolerance;
u: the resulting pier top displacement was numerically analyzed.
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| CN111291470B (en) * | 2020-01-17 | 2022-02-25 | 上海交通大学 | Method for rapidly predicting local scouring depth of ocean pile |
| CN112561257A (en) * | 2020-12-01 | 2021-03-26 | 合肥泽众城市智能科技有限公司 | Bridge structure safety evaluation method and device based on big data |
| CN114693151A (en) * | 2022-04-11 | 2022-07-01 | 哈尔滨工业大学 | Bridge pile foundation state diagnosis method based on distributed strain space correlation |
| CN116090303B (en) * | 2023-01-16 | 2023-11-21 | 广东科诺勘测工程有限公司 | Risk assessment method, device and equipment for scouring state of offshore pile foundation |
| CN116993229B (en) * | 2023-09-25 | 2023-12-19 | 山东高速工程检测有限公司 | Digital management method for construction quality of cross-sea bridge pile foundation |
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| CN107609304A (en) * | 2017-09-29 | 2018-01-19 | 中国铁道科学研究院铁道建筑研究所 | The fault diagnosis and prediction system and method based on PHM of LONG-SPAN RAILWAY bridge |
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| CN103020429A (en) * | 2012-11-27 | 2013-04-03 | 浙江工业职业技术学院 | Comprehensive decision-making and evaluating method for health condition of tied-arch bridge |
| CN105241660A (en) * | 2015-11-09 | 2016-01-13 | 西南交通大学 | High-speed rail large-scale bridge performance evaluation method based on health monitoring data |
| CN107609304A (en) * | 2017-09-29 | 2018-01-19 | 中国铁道科学研究院铁道建筑研究所 | The fault diagnosis and prediction system and method based on PHM of LONG-SPAN RAILWAY bridge |
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