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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2023, Vol. 17 Issue (8) : 1281-1294    https://doi.org/10.1007/s11709-023-0975-9
RESEARCH ARTICLE
Damage assessment and diagnosis of hydraulic concrete structures using optimization-based machine learning technology
Yantao ZHU1,2,3(), Qiangqiang JIA3,4, Kang ZHANG1,2, Yangtao LI1,2, Zhipeng LI1,2, Haoran WANG1,2
1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
3. National Dam Safety Research Center, Wuhan 430010, China
4. Changjiang Institute of Survey, Planning, Design, and Research, Wuhan 430010, China
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Abstract

Concrete is widely used in various large construction projects owing to its high durability, compressive strength, and plasticity. However, the tensile strength of concrete is low, and concrete cracks easily. Changes in the concrete structure will result in changes in parameters such as the frequency mode and curvature mode, which allows one to effectively locate and evaluate structural damages. In this study, the characteristics of the curvature modes in concrete structures are analyzed and a method to obtain the curvature modes based on the strain and displacement modes is proposed. Subsequently, various indices for the damage diagnosis of concrete structures based on the curvature mode are introduced. A damage assessment method for concrete structures is established using an artificial bee colony backpropagation neural network algorithm. The proposed damage assessment method for dam concrete structures comprises various modal parameters, such as curvature and frequency. The feasibility and accuracy of the model are evaluated based on a case study of a concrete gravity dam. The results show that the damage assessment model can accurately evaluate the damage degree of concrete structures with a maximum error of less than 2%, which is within the required accuracy range of damage identification and assessment for most concrete structures.

Keywords hydraulic structure      curvature mode      damage detection      artifical neural network      artificial bee colony     
Corresponding Author(s): Yantao ZHU   
About author:

Peng Lei and Charity Ngina Mwangi contributed equally to this work.

Just Accepted Date: 12 May 2023   Online First Date: 18 October 2023    Issue Date: 16 November 2023
 Cite this article:   
Yantao ZHU,Qiangqiang JIA,Kang ZHANG, et al. Damage assessment and diagnosis of hydraulic concrete structures using optimization-based machine learning technology[J]. Front. Struct. Civ. Eng., 2023, 17(8): 1281-1294.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-023-0975-9
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I8/1281
Fig.1  Stress analysis of the structure: (a) global stress analysis; (b) microsegmental stress analysis.
Fig.2  Schematic for calculating curvature modes from strain modes.
Fig.3  Displacement modal curve of the structure.
Fig.4  Topology of BP neural network.
Fig.5  Flowchart of structural damage assessment modeling.
Fig.6  Finite element model of the gravity dam.
node numbercurvature mode factornode numbercurvature mode factor
c1c2c3c1c2c3
2?58.72?239.04?196.342273.60436.96596.34
3?9.4485.76?32.012360.3246.08435.81
4141.60824.001354.0924358.40369.28?832.32
5280.641533.281956.7725164.80241.44?335.26
6350.241786.242477.4826160.00202.88?101.61
7358.241832.162224.4927140.00176.96?106.94
8354.401725.891953.3828156.32156.80?94.72
9323.841589.861700.5429133.74139.20?81.12
10311.041438.051479.9730143.2595.60?65.92
11283.361324.111308.5131140.2167.04?47.98
12278.401203.171119.5532142.1841.12?24.75
13256.321123.57983.5233135.8026.3724.96
14255.201014.88840.9934140.004.3880.50
15237.44964.00733.3735143.41?19.94190.01
16234.88845.28553.9436142.72?36.00321.42
17224.48750.40417.9037143.22?54.67525.53
18212.00697.66314.9838148.36?74.40777.78
19220.48576.00191.483973.60436.96596.34
20178.72493.4475.854060.3246.08435.81
21160.32428.00?38.38
Tab.1  Curvature mode factor of gravity dam with 12% single damage ( × 10?3)
modal factorcalculated value
1/1Δω1Δω190.91
1/1Δω2Δω270.42
1/1Δω3Δω345.45
ω1/ω1Δω1Δω1399.38
ω2/ω2Δω2Δω2701.54
ω3/ω3Δω3Δω3545.32
Tab.2  Frequency modal factor of gravity dam with 12% single damage
Fig.7  Schematic diagram of single-point damage position of the gravity dam.
actual damage degree (%)improved ABC-BP modelstandard BP model
assessment result (%)relative error (%)assessmentresult (%)relative error (%)
1212.181.4811.633.06
2222.100.4722.401.84
3232.050.1632.421.32
Tab.3  Single-point damage assessment results of the gravity dam
node numbercurvature mode factornode numbercurvature mode factor
c1c2c3c1c2c3
2?160.16?220.16?180.462284.48451.36556.00
3?7.6866.8849.672393.76163.84256.03
4138.88841.121363.9424302.56386.08?582.10
5281.281511.521930.4525102.88215.524.67
6346.241802.562480.9326147.28201.60?27.53
7358.561809.122193.1727132.56186.72?71.94
8350.561742.541954.9128139.38169.44?83.60
9324.161565.941668.6929160.91158.00?108.75
10307.201456.031482.6630139.90143.20?82.74
11284.321298.981277.5731150.22132.80?53.25
12274.561223.571024.6332149.68109.60?43.65
13257.441096.30923.7333185.28?123.49?296.94
14251.681039.04795.2234?34.59303.63486.26
15238.40933.12652.3935193.54?136.42538.81
16232.00875.20531.6736129.57113.26215.03
17225.28798.88493.1237150.64152.78220.56
18210.24715.20408.6938156.26165.49287.73
19220.32644.00373.463984.48451.36556.00
20179.68576.56319.344093.76163.84256.03
21165.20517.92263.93
Tab.4  Curvature mode factor for gravity dams with multiple point damage of 12% ( × 10?3)
Fig.8  Schematic diagram of multipoint damage position of the gravity dam.
modal factorcalculated value
1/1Δω1Δω1 42.37
1/1Δω2Δω2 43.48
1/1Δω3Δω3 15.38
ω1/ω1Δω1Δω1195.24
ω2/ω2Δω2Δω2454.26
ω3/ω3Δω3Δω3193.55
Tab.5  Frequency modal factor for gravity dams with multipoint damage of 12% ( × 10?3)
actual damage degree (%)improved ABC-BP modelstandard BP model
assessment result (%)relative error (%)assessment result (%)relative error (%)
12, 1211.86, 12.241.20, 1.9611.54, 11.573.84, 3.60
22, 2222.11, 21.910.48, 0.4021.68, 22.281.46, 1.28
32, 3232.22, 32.280.68, 0.8632.48, 31.641.51, 1.12
Tab.6  Multipoint damage assessment results of the gravity dam
methodsCgammarelative error (%)
ABC-SVM1.520.010.48
grid search-SVM1.080.0031.25
random search-SVM1.250.021.131
Tab.7  Evaluation and comparison of damage identification results
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