Feasibility Study of Tractor-Test Vehicle Technique for Practical Structural Condition Assessment of Beam-Like Bridge Deck
Abstract
:1. Introduction
2. The Tractor-Test Vehicle Technique (TTVT) of Non-Destructive Testing
2.1. Indirect Measurement of Mode Shape of Bridge Structures
2.2. Element Bending Stiffness of Beam from the Improved DSC Method
2.3. Reducing the Effect of Road Surface Roughness
2.4. Effect of Ambient Temperature
2.5. Analysis Procedure of Tractor-Test Vehicle Technique for Non-Destructive Testing
- (1)
- Record the acceleration responses of the two test vehicles in the undamaged state.
- (2)
- Identify the first modal frequency of the bridge structure from spectra of the residual displacement and corresponding residual acceleration , which indicate a vehicle response without the effect ofroad surface roughness based on tractor-test vehicle technique, in both the undamaged and damaged states of the structure. If the ambient temperature is different from the reference temperature, adjust the identified frequencies in both states to that at the reference temperature with Equation (36).
- (3)
- Normalize the acceleration response components in Equation(16) for the first vibration mode of the deck with to remove the transient effect. After the 1st bridge frequency is made available, one can extract the acceleration response components and the damping ratio of the 1st vibration mode of the deckassociated with from the corresponding residual accelerationby any feasible signal processing tools.
- (4)
- Then, obtaining the instantaneous amplitude history of the bridge component response for the 1st vibration mode shape. Performing the Hilbert transform to the decomposed bridge component response in Equation (18) yields its transform pair in Equation (19). Then, one can obtain the instantaneous amplitude history of the bridge component response using Equations (20) and (21).
- (5)
- Construct the first vibration mode shape from of the component response by Equation (21), the curve of the instantaneous amplitude function is representative of the mode shape of the bridge in absolute value. The sign of the 1st mode shape can be decided according to engineers’ judgment or experience [9].
- (6)
- Calculate the modal curvature of the beam using the mode shape obtained above by the central difference method with due correction described in Section 3.
- (7)
- Calculate the bending moment M of the beam with Equation (23) for each monitored cross-section of the deck.
- (8)
- Calculate the bending stiffness EI of the beam using Equation (22) for each monitored cross-section of the deck.
3. Numerical Study
3.1. Ratio of Vehicle Parameters
3.2. Effect of Constant Vehicle Speed
3.3. Effect of Non-Constant Vehicle Speed
3.4. Effect of Vehicle Modal Frequency
3.5. Effect of Road Surface Roughness
3.6. Effect of Bridge Damping Ratio
3.7. Effect of Measurement Noise
4. Damage Scenarios Studied
4.1. Case 1
4.2. Case 2
4.3. Case 3
4.4. Case 4
4.5. Discussion on the Boundary Effects
4.6. Discussion on the Variation of Bridge Bearing
5. Field Test Study
6. Conclusions
- (1)
- Two test vehicles are designed to have identical modal frequency and damping ratio, but the No.2 test vehicle has a mass, stiffness and damping coefficient proportional to those of the No.1 test vehicle. This technique can help to generate a response from an equivalent vehicle of a single vehicle-bridge system that is free from the effect of road surface roughness.
- (2)
- The first modal frequency and mode shape of the deck structure can be accurately estimated from the response of the equivalent vehicle with consideration of damping of the vehicle-tractor-bridge system, non-uniform test vehicle speed, measurement noise, and different ambient temperatures in the measurements.
- (3)
- The bending stiffness EI of the bridge deck can be better estimated with improvements proposed for the DSC method. For locations such as simply-supported ends of the beam, the improved DSC method can be used to obtain the stiffness by extrapolating the mode shape and using a refined model (or denser data measurements) near these locations.
- (4)
- The tractor-test vehicle technique of non-destructive testing with the proposed modifications has been demonstrated to be feasible for practical application to regular monitoring and evaluation of the structural health condition of a beam-like bridge deck with the advantages of simplicity, mobility, and ease of implementation.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Properties of Test Vehicle | No.1 | No.2 |
---|---|---|
Frequency (Hz) | 0.503 | 0.503 |
Mass (kg) | 5000 | 10,000 |
Stiffness (kN/m) | 50 | 100 |
Damping coefficient | 1 | 2 |
Speed (m/s) | 1 | 1 |
Properties of the No.1 Test Vehicle | No.1-1 | No.1-2 | No.1-3 | No.1-4 | No.1-5 | No.1-6 |
---|---|---|---|---|---|---|
Frequency (Hz) | 0.503 | 0.650 | 1.125 | 1.592 | 2.251 | 2.757 |
Mass (Kg) | 5000 | 3000 | 1000 | 500 | 1000 | 1000 |
(kN/m) | 50 | 50 | 50 | 50 | 200 | 300 |
Damping coefficient () | 1 | 1 | 1 | 1 | 1 | 1 |
Speed (m/s) | 1 | 1 | 1 | 1 | 1 | 1 |
Cases | Vehicle | Bridge | Road Surface Roughness | Temperature (°C) |
---|---|---|---|---|
1 | damped | undamped | -- | - |
2 | damped | damped | -- | - |
3 | damped | damped | Class C, D | - |
4 | damped | damped | Class C | −20, 0, 20 & 40 |
Damage Scenario | Damage Element(s) | Related Node Numbers | Reduction in Element Stiffness (%) | |||
---|---|---|---|---|---|---|
(a) | (b) | (c) | (d) | |||
A | D2 | 2, 3 | D2 = 0 | D2 = 15 | D2 = 30 | D2 = 50 |
B | D6 | 6, 7 | D6 = 0 | D6 = 15 | D6 = 30 | D6 = 50 |
C | D4, D7 | 4, 5 &7, 8 | D4 = 0 D7 = 0 | D4 = 15 D7 = 15 | D4 = 30 D7 = 30 | D4 = 50 D7 = 50 |
D | D5, D6 | 5, 6, 7 | D5 = 0 D6 = 0 | D5 = 15 D6 = 15 | D5 = 30 D6 = 30 | D5 = 50 D6 = 50 |
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Yang, Y.; Cheng, Q.; Zhu, Y.; Wang, L.; Jin, R. Feasibility Study of Tractor-Test Vehicle Technique for Practical Structural Condition Assessment of Beam-Like Bridge Deck. Remote Sens. 2020, 12, 114. https://doi.org/10.3390/rs12010114
Yang Y, Cheng Q, Zhu Y, Wang L, Jin R. Feasibility Study of Tractor-Test Vehicle Technique for Practical Structural Condition Assessment of Beam-Like Bridge Deck. Remote Sensing. 2020; 12(1):114. https://doi.org/10.3390/rs12010114
Chicago/Turabian StyleYang, Yang, Quan Cheng, Yuanhao Zhu, Lilei Wang, and Ruoyu Jin. 2020. "Feasibility Study of Tractor-Test Vehicle Technique for Practical Structural Condition Assessment of Beam-Like Bridge Deck" Remote Sensing 12, no. 1: 114. https://doi.org/10.3390/rs12010114
APA StyleYang, Y., Cheng, Q., Zhu, Y., Wang, L., & Jin, R. (2020). Feasibility Study of Tractor-Test Vehicle Technique for Practical Structural Condition Assessment of Beam-Like Bridge Deck. Remote Sensing, 12(1), 114. https://doi.org/10.3390/rs12010114