Long-Term Monitoring of Local Track Irregularity and Its Influence for Simply Supported Girder Bridge of HSR
Abstract
:1. Introduction
2. Analysis of Track State at the Beam Joint
2.1. Vehicle Model
2.2. Coupled Equation and Numerical Solution Method for Vehicle-Track-Substructure
2.3. Track Longitudinal Level at the Beam Joint with Temperature
2.4. Analysis of TQI at the Beam Joint with Temperature
2.5. Analysis of Reasons for Track State at the Beam Joint with Temperature
3. Analysis of Vehicle Response
3.1. Spectral Analysis
3.2. Analysis of Vehicle Response Inspection Data
4. Model of Vehicle–Track–Bridge Interaction
4.1. Model of Track-Bridge
4.2. Wheel–Rail Contact Principle
4.3. Selection of Track Geometric Irregularity
5. Threshold of Longitudinal Level at the Beam Joint
6. Maintenance Suggestions
7. Conclusions
- A peak of [5, 11] m wavelength for track longitudinal level exists at the beam joint of simply supported girder bridge in HSR with ballast track. In particular, the longitudinal level gets larger in winter and smaller in summer, which is opposite to those for bridges with a ballastless track. The difference between the absolute value of track longitudinal level at the beam joint and that at the midspan is [1, 3] mm;
- The relation between track longitudinal level at the beam joint and temperature can be summarized as LL = 0.0642T−3.3376. The relation between the TQI and temperature can be summarized as TQI = −0.02043T + 3.3314;
- According to vehicle response data and dynamic simulation results, train will suffer a significant shock at the beam joint, which will threaten running safety and service performance of the vehicle and track. There is a small difference in the vertical accelerations of the car body at the beam joint and midspan for the same bridge, and the maximum difference is just 0.02 g. The vertical acceleration of bogie at the beam joint is 1.21 g larger than that at the midspan, and the vertical acceleration of left axle box at the beam joint is 3.93 g larger than that at the midspan, and the WR vertical force at the left of the beam joint is 7.75 kN larger than that at the midspan;
- The dynamic longitudinal level at the beam joint of simply supported girder bridge in HSR with ballast track cannot exceed 14 mm, and the static value (10-meter chord measurement value) cannot exceed 11 mm, otherwise the maximum speed of train should be limited to 160 km/h or below, and the track operation should be carried out;
- The engineering department should carry out emergency maintenance operations for the sections where the track longitudinal level at the beam joint exceeds 11 mm, and carry out planned maintenance operations for the section where the track longitudinal level exceeds 8 mm. At the same time, on the premise of ensuring the overall smoothness of the line, the track longitudinal level at the beam joint can be adjusted to be a positive value. Furthermore, if the track longitudinal level at most beam joints of the whole bridge section is large, then large machine equipment is used to conduct tamping operation.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Degree of Freedom | Lateral Motion | Vertical Motion | Roll Motion | Pitch Motion | Yaw Motion |
---|---|---|---|---|---|
Car body | |||||
Bogie (i = 1,2) | |||||
Wheelset (i = 1,4) |
Case | Track Longitudinal Level | 10-Meter Chord Measurement | Peak-To-Peak Value |
---|---|---|---|
mm | mm | mm | |
1.0 time | −5.15 | −5.22 | 6.51 |
1.5 times | −7.72 | −7.83 | 9.75 |
2.0 times | −10.30 | −10.44 | 13.04 |
2.5 times | −12.88 | −13.05 | 16.25 |
3.0 times | −15.45 | −15.66 | 19.52 |
3.5 times | −18.03 | −18.13 | 25.34 |
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Li, G.; Yang, F.; Ke, Z.; Sun, X.; Liu, B.; Zhao, W.; Zhou, Y. Long-Term Monitoring of Local Track Irregularity and Its Influence for Simply Supported Girder Bridge of HSR. Buildings 2022, 12, 445. https://doi.org/10.3390/buildings12040445
Li G, Yang F, Ke Z, Sun X, Liu B, Zhao W, Zhou Y. Long-Term Monitoring of Local Track Irregularity and Its Influence for Simply Supported Girder Bridge of HSR. Buildings. 2022; 12(4):445. https://doi.org/10.3390/buildings12040445
Chicago/Turabian StyleLi, Guolong, Fei Yang, Zaitian Ke, Xianfu Sun, Bing Liu, Wenbo Zhao, and Yunlai Zhou. 2022. "Long-Term Monitoring of Local Track Irregularity and Its Influence for Simply Supported Girder Bridge of HSR" Buildings 12, no. 4: 445. https://doi.org/10.3390/buildings12040445