Finite Element Model Updating of RC Bridge Structure with Static Load Testing: A Case Study of Vietnamese ThiThac Bridge in Coastal and Marine Environment
Abstract
:1. Introduction
2. Review of Field Instruments for Non-Destructive Evaluation and SHM Systems of Bridge Structures in Vietnam
- (a)
- The pile driving analyser (PDA) system performs the high strain dynamic load testing on the deep foundations, such as the piers, abutments, pilots and piles, of bridges and buildings, which can evaluate the foundation capacity, shaft integrity and driving stresses based on the accelerometers and strain transducers.
- (b)
- The cross-hole analyser (CHA) system evaluates the concrete quality of the drilled shafts and the cast-in-place concrete piles in the deep foundations using the cross-hole sonic logging (CSL) method.
- (c)
- The pile integrity tester (PIT) system reveals cracks, necks and voids in concrete piles by pulse echo methods.
- (d)
- The Proceq Profometer device detects the locations of the rebars and performs the measurement of the concrete cover and the steel-reinforced bars embedded in the bridge structures.
- (e)
- The Geokon readings are used for the strain measurements in concrete foundations, piles, bridges, dams, tunnels and buildings by embedding the vibrating wire strain gauges in large aggregate concrete structures.
- (1)
- The WinSTS data acquisition software can control the WiFi data acquisition hardware nodes and the WiFi mobile-based station to record field data from the sensors. It can display the state of every node, such as the power, signal strength, name, standby mode or ‘sleep’ function. The monitoring sensors operate in real time so that one can set up zero sensors and access the calibrated sensor file. The sample rate, test duration and data file name can be assigned to collect data.
- (2)
- The mobile-based battery-powered WiFi hardware station can directly communicate with the WinSTS data acquisition software, which can control more than one WiFi data acquisition hardware node, also connected by an ethernet Internet cable through four ethernet ports and WiFi.
- (3)
- The four-channel WiFi data acquisition hardware node is powered by a rechargeable battery, using wireless technology to communicate with the WiFi mobile-based hardware station, which communicates wirelessly with a laptop and iPad for a signal range of more than 1.0 km. This WiFi node system can implement a wide variety of sensors.
- (4)
- Intelligent strain transducers are installed in steel members and reinforced concrete structures.
- (5)
- Accelerometers record the dynamic behaviour of structures and concrete piers.
- (6)
- The micro-strain measurements are integrated with reusable quarter bridge foil strain gauges, which can measure the strain of the different materials, e.g., fibre-reinforced polymer (FRP), reinforced steel bars.
- (7)
- The LVDT displacement sensors are used to determine the deflection of structural members and spans.
- (8)
- The auto-clicker is used to track the position of moving trucks at every wheel revolution, and it is placed on the driver-side front wheel.
3. A Case Study: Vietnamese ThiThac Bridge
3.1. Optimisation Approach
- (1)
- Run the static load test on the bridge using WinSTS software;
- (2)
- Evaluate and assess the measured data using WinGRF software and MATLAB software;
- (3)
- Generate and analyse the linear elastic FE model of the structure using SOFISTIK software;
- (4)
- Compare the measured strain responses with the numerical strain results of the FE model until the modelling errors are minimised;
- (5)
- Apply the load ratings using design standards and codes in the final updated FE model, and then assess other problems such as structural damages from the final adjusted FE model.
- (1)
- The first step in generating the realistic FE bridge model in the SOFISTIK software using the TEDDY text editor and the CADINP input language is to simulate the planar geometry of the bridge model. This includes beam elements (BEAM NO) to represent concrete beams and diaphragms, shell/plate elements (QUAD) for the concrete deck slab and spring elements (SPRI NO) for the elastic restraints of support boundary conditions. The geometry (SECT) and stiffness properties (MAT) are defined for concrete bridge beams and concrete deck slabs, as well as elastic spring supports. The stiffness parameters of the material and the cross-sectional properties of the structural members can be added by the command lines as #DEFINE, so that the possible input file is generated with the input file name as bridge.dat or bridge.txt, implemented in the SOFISTIK software, and the new parameters are obtained after every iteration step.
- (2)
- The second step involves developing the command lines in the MATLAB software to read the input file to interface with the SOFISTIK software, so as to analyse the FE bridge model automatically and connect it with the computational results of the FE bridge model. For example, the command lines in the MATLAB software are the following:
- > ga(error function, number of paramerters, [], [], [], [], lower bound, upper bound, [], [], optimoptions(‘ga’));
- > system(sprintf(‘ ”%s” %s ’, “…\SOFiSTiK 2022\sps.exe”, input file)).
- (3)
- The third step involves evaluating the final updated FE bridge model with the new stiffness parameters after each iteration. The load cases are modelled in the SOFISTIK software by using the command lines as LC and POI AUTO TYPE, and the numerical stress and strain behaviour of the bridge structure is analysed and saved as output files as strain.csv, ratingfactor.csv, etc. This procedure is the same as in the first step. Stopping criteria should be applied, in which the average percentage error of the objective function is less than 10% and additional error values between experimental and numerical strain responses should be also less than 10%.
- (1)
- Apply the design load standards to the final FE model;
- (2)
- Compute the predictions of the stress levels of the key structural members;
- (3)
- Perform the load rating calculation using the RF equation;
- (4)
- Check if RF ≥ 1 for the bridge, which passes the design loads, or if RF < 1, it fails the legal vehicle loads.
3.2. Structure Description and Field Test Procedure
- (1)
- Install intelligent strain transducers attached to the eight concrete beams on the surface located at the middle bridge span near the bottom of the cross-sectional centroid to measure the static strain responses, in order to determine the axial force of each structural member. Bridge span 1 was installed with five strain transducers, while bridge spans 2, 3 and 4 were instrumented with eight strain transducers in each structural span. Some bridge spans could be installed, and the LVDT displacement sensors only measured the deflection responses of two spans (1 and 4) near the area of the bridge abutment where the foundation of the scaffold system could be placed. Accelerometers were attached to the top deck and each pier and abutment to measure the dynamic responses of each structural bridge span in the vertical, horizontal and longitudinal directions under the high-speed vehicle. Attachment methods of strain transducers and accelerometers on the bridge structure include C-clamps, threaded mounting tabs and quick-setting adhesive, wood screws or concrete anchors, installed in a non-destructive manner, which can be removed easily after field testing.
- (2)
- Data sets in field testing were recorded with three load cases (left and right eccentric positions, centric load) of static load testing (sampling frequency recommended 30 Hz–80 Hz or better), one load case of dynamic testing (sampling frequency over 100 Hz to 250 Hz) with a high-speed truck at 100 km/h and three truck paths travelling at 5 km/h for quasi-static load testing (sampling frequency less than 50 Hz). Every load case test cycle was run three times to ensure reproducibility in the data files.
- (3)
- The WinSTS data acquisition software is used as the computer interface for the STS-WiFi hardware under a Windows operating system environment, which can control all functions in the STS-WiFi equipment to collect data. It can serve all main functions, including outputting a real-time graphical display; sensors’ calibration factors; auto zero mode; and providing detailed information on mobile base stations, nodes and sensors. One of the most important steps is to set the sampling frequency and reset all sensors to zero values before testing.
3.3. Experimental Results of Field Load Testing
3.4. FE Model Updating and Analysis
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Stiffness Parameters | Initial Value | Lower Limit | Upper Limit | Final Values | |||
---|---|---|---|---|---|---|---|
Span 1 | Span 2 | Span 3 | Span 4 | ||||
Ec, [GPa] | 25 | 21 | 40 | 27.63 | 21.24 | 21.02 | 25.68 |
td [mm] | 100 | - | - | - | - | - | - |
h [mm] | 400 | 0.15 × h | 2.5 × h | - | - | - | - |
b [mm] | 1180 | 0.15 × b | 2.5 × b | - | - | - | - |
I1, [m4] | 6.29 × 10−3 | 3.18 × 10−6 | 0.24 | 12.89 × 10−3 | 12.23 × 10−3 | 22.49 × 10−3 | 6.782 × 10−3 |
I2, [m4] | 6.29 × 10−3 | 3.18 × 10−6 | 0.24 | 4.891 × 10−3 | 70.08 × 10−3 | 3.974 × 10−3 | 0.030 × 10−3 |
I3, [m4] | 6.29 × 10−3 | 3.18 × 10−6 | 0.24 | 0.754 × 10−3 | 0.042 × 10−3 | 4.413 × 10−3 | 0.123 × 10−3 |
I4, [m4] | 6.29 × 10−3 | 3.18 × 10−6 | 0.24 | 25.73 × 10−3 | 0.006 × 10−3 | 3.236 × 10−3 | 0.943 × 10−3 |
I5, [m4] | 6.29 × 10−3 | 3.18 × 10−6 | 0.24 | 12.74 × 10−3 | 0.076 × 10−3 | 0.928 × 10−3 | 1.545 × 10−3 |
I6, [m4] | 6.29 × 10−3 | 3.18 × 10−6 | 0.24 | 10.79 × 10−3 | 0.021 × 10−3 | 2.712 × 10−3 | 0.607 × 10−3 |
I7, [m4] | 6.29 × 10−3 | 3.18 × 10−6 | 0.24 | 29.14 × 10−3 | 0.850 × 10−3 | 0.027 × 10−3 | 1.959 × 10−3 |
I8, [m4] | 6.29 × 10−3 | 3.18 × 10−6 | 0.24 | 5.467 × 10−3 | 0.025 × 10−3 | 4.531 × 10−3 | 11.69 × 10−3 |
Percent Error [%] | - | - | - | 0.01 | 0.21 | 6.31 | 7.16 |
RF (HL93) | - | - | - | 0.36 | 0.05 | 0.09 | 0.10 |
RF (H-20, 20 tons) | - | - | - | 1.09 | 0.12 | 0.28 | 0.31 |
RF (HS-20, 36 tons) | - | - | - | 0.94 | 0.11 | 0.24 | 0.26 |
RF (Type 3, 25 tons) | - | - | - | 1.07 | 0.14 | 0.30 | 0.32 |
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Nguyen, D.C.; Salamak, M.; Katunin, A.; Gerges, M. Finite Element Model Updating of RC Bridge Structure with Static Load Testing: A Case Study of Vietnamese ThiThac Bridge in Coastal and Marine Environment. Sensors 2022, 22, 8884. https://doi.org/10.3390/s22228884
Nguyen DC, Salamak M, Katunin A, Gerges M. Finite Element Model Updating of RC Bridge Structure with Static Load Testing: A Case Study of Vietnamese ThiThac Bridge in Coastal and Marine Environment. Sensors. 2022; 22(22):8884. https://doi.org/10.3390/s22228884
Chicago/Turabian StyleNguyen, Duc Cong, Marek Salamak, Andrzej Katunin, and Michael Gerges. 2022. "Finite Element Model Updating of RC Bridge Structure with Static Load Testing: A Case Study of Vietnamese ThiThac Bridge in Coastal and Marine Environment" Sensors 22, no. 22: 8884. https://doi.org/10.3390/s22228884