Effect of Train Vibrations on the Dynamic Response of a Multi-Span Double-Curved Brick Arch Thin-Shell Factory of Changleyuan
Abstract
:1. Introduction
2. Project Overview
3. Field Dynamic Test
4. Test Results and Analysis
4.1. Results Pre-Processing
4.2. Dynamic Characteristic Analysis of the Thin-Shell Factory under the Action of Ground Pulsation
4.3. Dynamic Response Analysis of the Thin-Shell Factory under Train Vibration Load
- With respect to velocity and acceleration, for all of the measurement points (P1–P6), the vertical amplitudes were larger than the horizontal amplitudes.
- With respect to velocity and acceleration, for the three measurement points at the bottom of the arch, whether horizontal or vertical, the amplitude showed a decreasing trend (P1 > P2 > P3). Similarly, for the three points at the top of the arch, the amplitude also showed a decreasing trend (P4 > P5 > P6), indicating that the farther away from the railroad, the smaller the vibration.
- When comparing the amplitude of velocity between the measurement points located at the same distance from the railroad, whether horizontal or vertical, the amplitude of the velocity was not significantly different between P1 and P4, P2 and P5, and P3 and P6, indicating that the velocity of the vibration at the bottom of the arch was basically the same as that at the top of the arch. When comparing the acceleration amplitudes of the measurement points located at the same distance from the railroad, whether horizontal or vertical, the acceleration amplitudes were as follows: P1 > P4, P2 > P5, and P3 > P6, indicating that the acceleration of the vibration at the bottom of the arch was greater than that at the top of the arch, with an average amplitude of 40.64%.
5. Finite-Element Numerical Simulation Analysis
5.1. Establishment of the Finite-Element Model for the Thin-Shell Factory
5.2. Model Checking
5.3. Establishment of the Finite-Element Model for the Soil Structure
5.4. Simulation of Train Vibration Load
5.5. Dynamic Response Checking
5.6. Analysis of the Dynamic Response of the Thin-Shell Factory under Different Train Vibration Loads
6. Vibration Evaluation of the Thin-Shell Factory
7. Conclusions
- (1)
- The field dynamic test results of the thin-shell factory show that the first- and second-order frequencies in the horizontal direction of the structure were 6.24 Hz and 18.50 Hz, respectively, and that the first- and second-order frequencies in the vertical direction were 9.31 Hz and 19.28 Hz, respectively.
- (2)
- The vibration in the horizontal direction is the overall vibration of the factory, whereas the vibration in the vertical direction is the individual vibration of the double-curved brick arch.
- (3)
- The self-oscillation frequency obtained from the numerical simulation results (which were based on the assumption of complete elasticity) was greater compared with the field measurements because of the reduced structural stiffness. Additionally, the maximum error rate was only 7.14%.
- (4)
- Both in acceleration and velocity, the vertical vibration for each measurement point was larger than the horizontal vibration, and the farther away from the railroad, the smaller the vibration. The velocity of the vibration at the bottom of the arch was almost the same as that at the top of the arch, while the acceleration of the vibration at the bottom of the arch was significantly larger than that at the top of the arch, with an average amplitude of 40.64%.
- (5)
- For every 20 km/h increase in train running speed, the average increase in the vertical acceleration amplitude, vertical velocity amplitude, horizontal acceleration amplitude, and horizontal velocity amplitude for each measurement point of the thin-shell factory was 35.4%, 29.8%, 23.7%, and 12.5%, respectively.
- (6)
- When v = 150 km/h, the maximum velocity amplitude for each measurement point of the thin-shell factory was 1.163 mm/s, which is less than the security specification limit of 2.5 mm/s, such that the security of the thin-shell factory meets the requirement, and the maximum horizontal velocity amplitude was 0.272 mm/s, which is close to the integrity specification limit of 0.27 mm/s, such that the integrity of the thin-shell factory just exceeds the requirement; so it is suggested that train running speeds should not exceed 150 km/h and that the thin-shell factory needs to strengthen the monitoring and protection of its integrity.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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First-Order Frequency | Second-Order Frequency | |
---|---|---|
Horizontal | 6.24 | 18.50 |
Vertical | 9.31 | 19.28 |
Material | Density (kg/m3) | Elasticity Modulus (MPa) | Poisson’s Ratio |
---|---|---|---|
Concrete | 2400 | 20,000 | 0.167 |
Brick | 1900 | 4500 | 0.15 |
Oder | Direction | Simulation | Measurement | Error Rate (%) |
---|---|---|---|---|
First | Horizontal | 6.72 | 6.24 | 7.14 |
Vertical | 9.86 | 9.31 | 5.58 | |
Second | Horizontal | 19.15 | 18.50 | 3.39 |
Vertical | 20.03 | 19.28 | 3.74 |
Condition of Control | Li (m) | αi (mm) |
---|---|---|
Smoothness of traffic (i = 1) | 50.00 | 16.000 |
20.00 | 9.000 | |
10.00 | 3.500 | |
5.00 | 2.500 | |
Additional dynamic load applied to the line (i = 2) | 2.00 | 0.400 |
1.00 | 0.300 | |
Wear of the track waveform (i = 3) | 0.50 | 0.080 |
0.05 | 0.005 |
Standards/Scholars | Vibration Amplitude Limit (mm/s) | Frequency Range (Hz) | Control Standards | Note Description |
---|---|---|---|---|
International Standard ISO 2631 [28] | 2.5~10 | -- | Security | |
German Standard DIN 4150-3 [29] | 2.5 | 1~10 | Security | Structures affected by continuous long-term vibration; horizontal velocity limit for the top floor of a structure |
Swiss Standard SN 640312a [30] | 3.0 | 10~30 | Security | Vibration source for machinery, transportation, and construction equipment |
Federal Transit Administration FTA Standard [31] | 3.08 | -- | Security | |
Anti-Industrial Vibration of Ancient Buildings Technical Specification (GB/T50452-2008) [32] | 0.15~0.2 | -- | Integrity | National key cultural relics protection unit of ancient masonry load-bearing structures at the highest water-level velocity limit |
Remington [33] | 2 | -- | Security | |
Konon, Schuring [34] | 6.4~12.7 | 10~40 | Security | |
YANG Xianjian, PAN Fulan [35] | 1.8 | -- | Security |
V = 60 km/h | V = 80 km/h | V = 100 km/h | V = 120 km/h | V = 150 km/h | V = 250 km/h | |
---|---|---|---|---|---|---|
P1 | 0.522 | 0.625 | 0.786 | 0.891 | 1.163 | 1.871 |
P2 | 0.246 | 0.374 | 0.451 | 0.659 | 0.927 | 1.623 |
P3 | 0.178 | 0.235 | 0.377 | 0.578 | 0.780 | 1.454 |
P4 | 0.605 | 0.689 | 0.794 | 0.921 | 1.132 | 1.896 |
P5 | 0.293 | 0.342 | 0.478 | 0.632 | 0.918 | 1.685 |
P6 | 0.174 | 0.214 | 0.376 | 0.598 | 0.811 | 1.518 |
V = 60 km/h | V = 80 km/h | V = 100 km/h | V = 120 km/h | V = 150 km/h | V = 250 km/h | |
---|---|---|---|---|---|---|
P1 | 0.182 | 0.199 | 0.220 | 0.243 | 0.272 | 0.394 |
P2 | 0.126 | 0.142 | 0.157 | 0.181 | 0.216 | 0.318 |
P3 | 0.103 | 0.118 | 0.138 | 0.165 | 0.201 | 0.302 |
P4 | 0.184 | 0.193 | 0.217 | 0.247 | 0.266 | 0.371 |
P5 | 0.107 | 0.124 | 0.142 | 0.177 | 0.209 | 0.314 |
P6 | 0.098 | 0.110 | 0.136 | 0.161 | 0.197 | 0.307 |
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Liu, Y.; Si, J.; Zhou, Y.; Ma, P.; Wang, Y.; Zhou, M.; Ju, J.; Niu, X. Effect of Train Vibrations on the Dynamic Response of a Multi-Span Double-Curved Brick Arch Thin-Shell Factory of Changleyuan. Buildings 2023, 13, 2400. https://doi.org/10.3390/buildings13092400
Liu Y, Si J, Zhou Y, Ma P, Wang Y, Zhou M, Ju J, Niu X. Effect of Train Vibrations on the Dynamic Response of a Multi-Span Double-Curved Brick Arch Thin-Shell Factory of Changleyuan. Buildings. 2023; 13(9):2400. https://doi.org/10.3390/buildings13092400
Chicago/Turabian StyleLiu, Yefeng, Jianhui Si, Yuan Zhou, Peiyuan Ma, Yi Wang, Ming Zhou, Junpeng Ju, and Xiaoyu Niu. 2023. "Effect of Train Vibrations on the Dynamic Response of a Multi-Span Double-Curved Brick Arch Thin-Shell Factory of Changleyuan" Buildings 13, no. 9: 2400. https://doi.org/10.3390/buildings13092400