Article
Engineering, Multidisciplinary
Weichao Yang, E. Deng, Xuhui He, Lusen Luo, Zhihui Zhu, Youwu Wang, Zhitang Li
Summary: The study focuses on the influence mechanism of porous wind barriers (PWBs) in tunnel-bridge section (TBS) along high-speed railway lines. Results show that PWBs can reduce aerodynamic load coefficients of trains by 36-95%, but design parameters should not be the same along the full-length PWB on the tunnel-bridge-tunnel infrastructure (TBTI). Adjustments in PWB height and porosity in the TBS are necessary to achieve equivalent windproof performance.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2021)
Article
Chemistry, Multidisciplinary
Dianyi Guo, Shuo Jiang, Yunfeng Zou, Xuhui He, Qingkuan Liu
Summary: This paper introduces a new type of wind guide barrier (WGB), and conducts wind tunnel experiments to study the key parameters of three types of WGB and their effects on the aerodynamic characteristics of a high-speed train and blunt body box girder system, as well as the wind field on the bridge deck. The results show that the main factor affecting the windproof performance of the WGB is the shielding effect. The WGB can achieve similar wind pressure distribution on the train as a vertical wind barrier, while reducing resistance and increasing the aerodynamic coefficient on the train.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Civil
Yulong Bao, Wanming Zhai, Chengbiao Cai, Shengyang Zhu, Yongle Li
Summary: This paper investigates the influence of rolling angle on the aerodynamic characteristics of suspended monorail trains (SMTs) through pressure measurements in a wind tunnel. The results show that rolling angle affects the surface pressure distribution of SMT, particularly near the corner of the windward surface. Furthermore, a series of fitting formulas are proposed to estimate the aerodynamic coefficients of the train under different rolling angles, and the aerodynamic admittance functions of SMT exhibit peak values at a specific reduced frequency near 0.05.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Engineering, Civil
Weichao Yang, Huan Yue, E. Deng, Youwu Wang, Xuhui He, Yunfeng Zou
Summary: This study investigates the influence of different turbulent conditions on the aerodynamic response of high-speed trains passing through a tunnel-bridge-tunnel section. The results show that turbulence intensity and average wind speed have a significant impact on the aerodynamic loads of the train, especially at the bridge section. A simplified pulsating incoming flow simulation scheme is proposed.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Chemistry, Multidisciplinary
Jian Yan, Tefang Chen, E. Deng, Weichao Yang, Shu Cheng, Biming Zhang
Summary: In this study, a Computational Fluid Dynamics computational model was used to measure the transient aerodynamic load of trains on a bridge, showing significant fluctuations in aerodynamic coefficients as the train entered and exited wind barriers. The height of wind barriers was found to affect the maximum derailment coefficient, while not significantly impacting the wheel load reduction rate. High wind barriers were shown to offer better protection, with over-protection observed with even higher barriers.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Civil
E. Brambilla, S. Giappino, G. Tomasini
Summary: Research conducted through wind tunnel tests found that the dimensions and configuration of windbreak barriers can affect the aerodynamic coefficients of trains in crosswinds. Special attention should be paid to the splitter plate dimensions, as a limited upwind width can underestimate aerodynamic coefficients, while barriers with too short lengths may overestimate coefficients.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Chemistry, Analytical
Yunfeng Zou, Zhipeng Liu, Kang Shi, Shuangmei Ou, Xuhui He, Honggui Deng, Shuai Zhou
Summary: This study systematically investigates the aerodynamic characteristics and interference effects of the suspended monorail (SM) vehicle-bridge system under various spacing ratios. A wireless wind pressure acquisition system is proposed for multi wind pressure test taps synchronization. The recommended spacing ratio of 3.5 ensures the running safety and stability of the SM system under exposure to crosswinds.
Article
Construction & Building Technology
Yunfeng Zou, Zhipeng Liu, Kang Shi, Xuhui He, Honggui Deng
Summary: A new aerodynamic measurement technology for moving vehicle models is proposed in this study, which addresses technical obstacles in traditional testing methods. By using a U-shaped launching ramp and a wireless pressure acquisition system, higher accuracy is achieved and the test requirements for the moving vehicle-bridge system are fully met.
ADVANCES IN STRUCTURAL ENGINEERING
(2022)
Article
Engineering, Civil
Yunfeng Zou, Zhipeng Liu, Kang Shi, Jun Song, Xuhui He, Qingkuan Liu
Summary: This study systematically investigates the aerodynamic characteristics of a suspended monorail transport under crosswinds using wind tunnel tests. The effects of vehicle-bridge combinations and the aerodynamic coupling effects are examined. The results show that considering the aerodynamic coupling effects significantly increases the aerodynamic characteristics of the vehicle and bridge models. The location of the running vehicle has a significant impact on the aerodynamic characteristics of the bridge.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2022)
Article
Engineering, Civil
Yunfeng Zou, Zhipeng Liu, Kang Shi, Xuhui He, Shuai Zhou, Wenrong Ma
Summary: A dynamic simulation model of a suspended monorail vehicle-bridge system was developed using ANSYS and SIMPACK. Wind tunnel tests were conducted to measure the aerodynamic coefficients and the effects of vehicle-bridge combination and spacing ratio on the system's dynamic response were studied. The study found that the vehicle-bridge combination significantly affected the aerodynamic coefficient, and increasing the spacing ratio reduced vehicle drag.
Article
Engineering, Civil
Xiaozhen Li, Yanxi Zhou, Ming Wang
Summary: This study investigates the aerodynamic interference and dynamic influence of wind barriers on train-bridge systems through wind tunnel tests and coupling vibration analysis. Installing wind barriers increases the side and lift coefficients of the bridge while reducing the coefficients for the train. Optimizing the side coefficient of the train is key to improving the wind-resistant performance of the wind barrier.
KSCE JOURNAL OF CIVIL ENGINEERING
(2023)
Article
Engineering, Civil
Houyu Gu, Tanghong Liu, Zhiwei Jiang, Zijian Guo
Summary: The length of the wind barrier has a significant influence on the aerodynamic characteristics of the head car, with lift force decreasing, lateral force increasing, and drag force approaching 0 as the barrier length increases. The lateral and drag forces of the head car remain relatively stable after a certain barrier length at specific yaw angles.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2021)
Article
Engineering, Civil
Ming Wang, Zuxiang Wang, Xiaowei Qiu, Xingxing Li, Xiaozhen Li
Summary: This paper analyzes the effects of wind barriers on the aerodynamic characteristics of high-speed trains using a moving model test rig in a wind tunnel. The results show that wind barriers can significantly improve the running performance of trains by reducing wind action on the train body.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Engineering, Civil
Taiming Huang, Mingchen Feng, Jie Huang, Jingmao Ma, Dingxun Yi, Xun Ren, Li Zhang, Wei Zeng
Summary: This study investigates the transient aerodynamic characteristics and dynamic response of vehicles passing through bridge towers at high speeds in different lanes with varied adhesion coefficients under crosswind conditions using the two-way coupling method. The results indicate that the aerodynamic load fluctuates more significantly due to the influence of the bridge tower, and driving in the L1 lane in a crosswind environment is relatively less safe.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Engineering, Civil
Carlos Esteban Araya Reyes, Daniele Rocchi, Gisella Tomasini, Mikel Iraeta Sanchez, Maialen Artano
Summary: Crosswind stability studies have increased since the 90s due to higher speeds and lighter railway vehicles. Initially focused on high-speed trains, recent studies have found that conventional trains at lower speeds are also at risk of overturning in crosswinds. This study analyzed a conventional train designed by CAF to evaluate the impact of different roof and underbody designs on the train's aerodynamic performance. Wind tunnel testing at Politecnico di Milano was conducted on a scaled model to determine the aerodynamic coefficients of different train configurations. The European Standard EN14067-6 procedure was applied to evaluate train stability using time-dependent multibody simulations and the 'Chinese hat' wind time history. Results showed a significant improvement for some configurations, particularly when the roof was closed.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Thermodynamics
Chuanjin Yu, Yongle Li, Liyang Zhao, Qian Chen, Yuxing Xun
Summary: This study develops a novel recurrent neural network model to improve the accuracy of wind speed prediction. By incorporating wavelet transformation and convolution processes, the model demonstrates superior performance in multi-step wind speed forecasts. The model shows low sensitivity to input length and wavelet parameters and is able to accurately predict wind speed in a short amount of time.
Article
Engineering, Civil
Yubing Song, Zilong Ti, Yongle Li
Summary: This study presents an efficient two-stage hybrid approach that combines a divergent vibration simulation and a nonlinear model for predicting vortex-induced vibration (VIV) in bridge decks. By introducing negative structural damping, a divergent vibration is intentionally created which significantly accelerates the growth of motion while maintaining reasonable accuracy. The proposed framework shows favorable efficiency, satisfactory accuracy, and is a potential numerical alternative for VIV investigation in bridge decks.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Engineering, Civil
Haojun Tang, Jia Kang, Yongle Li
Summary: During the early erection stages of suspension bridges, the three-dimensional flow field around the short girder affects the wind-resistant performance. To accurately determine the aerodynamic coefficients and flutter derivatives, efficient three-dimensional computational fluid dynamics (CFD) models were used. The aerostatic and aerodynamic stability of the bridge were investigated by considering different angles of attack and non-uniform wind loads. The results showed that the aerodynamic stability is worse during the early erection stages, but can be improved by adding counterweights inside the box girder.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Engineering, Civil
Longfei Xing, Jinxiang Zhang, Mingjin Zhang, Yongle Li, Shuai Zhang, Tingyuan Yan
Summary: In this study, a mountainous region in Southwestern China was selected as the research object for a WRF experiment. The Pair-Copula decomposition method was used to construct a trivariate joint distribution model of the atmospheric boundary layer height, terrain elevation, and surface relief degree. The model revealed that the ABL height fluctuated more in regions with higher surface undulation. The model can be applied to evaluate the probability distribution of ABL height in complex terrains, providing more accurate boundary conditions for simulating wind environments around bridges. This method can be extended to wind field simulation in various regions.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Engineering, Marine
Qinghong Wu, Guoji Xu, Shihao Xue, Jinsheng Wang, Yongle Li
Summary: This study focuses on the integrated countermeasure of fairing and opening holes to reduce tsunami forces on coastal T-girder bridge decks. Through experiments and numerical simulations, it is found that the combination of fairing and opening-hole countermeasures has a favorable mitigation effect on both horizontal and vertical tsunami forces. This mitigation effect improves with increasing tsunami bore wave height.
Article
Engineering, Civil
Bin Wang, Weixu Wang, Yongle Li, Fangyuan Lan
Summary: The coupled vibration of the wind-vehicle-bridge system is crucial for ensuring the safety and comfort of vehicles on bridges in crosswinds. While wind tunnel experiments are the preferred method for studying the aerodynamics of the system, their limitations in size and scaled models may introduce Reynolds number effects. Therefore, Computational Fluid Dynamics (CFD) has emerged as an alternative tool. In this paper, a review of CFD-based studies on the aerodynamics of the vehicle-bridge system is provided, including the stationary and moving systems, bridge tower shielding effects, wind fence protection, and complex surroundings. The validation results of the simulations are highly reliable, establishing confidence in the use of CFD for exploring the aerodynamic characteristics of the vehicle-bridge system. Comments and future trends are also discussed.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Engineering, Civil
Mingjin Zhang, Jinxiang Zhang, Hongyu Chen, Xu Xin, Yongle Li, Fanying Jiang
Summary: This paper systematically considers the nonstationary characteristics, randomness, and correlation of wind field parameters through field measurement data. Joint probability model and environmental contour model are constructed, and probabilistic turbulence wind spectrum models are obtained. The results show that the wind field has prominent nonstationary characteristics and the wind speed threshold has little effect on the disturbance. Furthermore, ignoring wind direction can lead to incorrect estimation of correlation characteristics between wind parameters. The wind spectrum constructed in this paper provides an essential reference for evaluating uncertainty in the design stage of long-span bridges.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Green & Sustainable Science & Technology
Qian Chen, Peng He, Chuanjin Yu, Xiaochi Zhang, Jiayong He, Yongle Li
Summary: Accurately predicting wind speed is crucial for maximizing the use of wind energy. Innovative models have been developed to explore the sequence connection between wind speed and its frequency characteristics, improving forecast accuracy. These models utilize multiple convolutions and state frequency memory recurrent block to capture internal features and extract relevant frequency properties. Different attention mechanisms are applied to facilitate multi-resolution feature fusion. The proposed models outperform other models in terms of forecast accuracy, as demonstrated in evaluation tests using real-world data.
Article
Engineering, Civil
Ming Lei, Jin Zhu, Kaifeng Zheng, Mengxue Wu, Yongle Li
Summary: In China, more and more rail-cum-road bridges are being built to meet the increasing demand for transportation. This study develops an analytical framework to simulate the complex wind-road vehicle-train-bridge system and proposes a scalable multiple-time-step algorithm to improve computational efficiency. The results show that both the MTS and SMTS algorithms achieve better accuracy and efficiency compared to the STS algorithm, with the SMTS algorithm offering more flexibility.
JOURNAL OF BRIDGE ENGINEERING
(2023)
Article
Engineering, Civil
Bin Wang, Shengran Hao, You-Lin Xu, Yang Liu, Yongle Li
Summary: This paper analyzes the general polynomial model for vortex-induced force (VIF) and proposes a concise polynomial model and a simple method for predicting vortex-induced vibrations (VIV). Through computational fluid dynamics simulations, the effectiveness of the proposed method is verified.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Engineering, Civil
Haojun Tang, Yongle Li
Summary: An increasing number of double-main-span suspension bridges with three towers are now constructed. Close modes in this bridge type exhibit similar characteristics during girder erection, which is important but hard to accurately determine the modal combination for flutter analyses. In this paper, full-order modal flutter analyses were performed to study the flutter performance of a double-main-span suspension bridge during erection. The results show that reinforcing the connections between girder segments in the lateral direction could significantly improve the anti-symmetrical flutter stability, while proper temporary constraints or connections are favorable for the symmetrical flutter instability.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Engineering, Civil
Jiajun He, Jin Zhu, Huoyue Xiang, Botao Zhang, Yongle Li, Bing Han
Summary: This paper investigates the aerodynamic characteristics of vehicles on a single-level rail-cum-road bridge, as well as the aerodynamic interference among vehicles. The results show that the bridge deck significantly affects the aerodynamic coefficients of windward lane vehicles, while protecting the train and leeward road vehicles from wind load. Among all vehicles, the van has the largest aerodynamic coefficients and is considered critical. The upstream truck trailer causes significant aerodynamic variation for overtaking vehicles, but its inadequate shelter effect leads to fluctuation. Moreover, the train experiences a significant increase in aerodynamic load with larger distance to the truck trailer.
KSCE JOURNAL OF CIVIL ENGINEERING
(2023)
Article
Engineering, Civil
Mingjin Zhang, Yiyan Dai, Bo Hu, Xu Xin, Lianhuo Wu, Yongle Li
Summary: The study investigates the characteristics of wind fields in mountainous areas, which are crucial for the construction of long-span bridges. An improved method of fitting boundary curves is proposed and the fluctuating wind field is generated using the Correlation Improved Random Flow Generation method. Numerical simulations confirm the reliability of the proposed method. The results provide insights into the wind resistance of bridges built in mountainous areas.
KSCE JOURNAL OF CIVIL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Fanying Jiang, Jinxiang Zhang, Mingjin Zhang, Yongle Li, Jingxi Qin
Summary: The wind in mountainous terrain is a mixed system, including synoptic wind and thermally-driven wind. Classifying intense winds into homogenous groups is necessary to accurately estimate their wind speed and parameters. A framework and program for classifying and extracting intense winds in mountain terrain based on wind speed and temperature features is developed. Several types of intense winds are identified and analyzed, showing significant differences in wind parameters for winds of different scales.
Article
Green & Sustainable Science & Technology
Lianhuo Wu, Mingjin Zhang, Fanying Jiang, Zelin Zhou, Yongle Li
Summary: This paper analyzes the aerodynamic forces on a streamlined box girder (SBG) with coupled vibration. The key step is to assume that the normal airflow velocity at any point on the SBG surface is equal to the surface motion velocity. The aerodynamic drag force, lift force, and pitching moment are expressed as functions of the SBG motion state and shape-related parameters. The analytical solution is compared with a numerical simulation in viscous flow, and the results show good agreement under certain angles of attack.
