Beijing Key Laboratory of Structural Wind Engineering and Urban Wind Environment

Beijing, China

Beijing Key Laboratory of Structural Wind Engineering and Urban Wind Environment

Beijing, China

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Guo W.,Beijing Jiaotong University | Guo W.,Beijing Key Laboratory of Structural Wind Engineering and Urban Wind Environment | Guo W.,KTH Royal Institute of Technology | Xia H.,Beijing Jiaotong University | And 4 more authors.
Wind and Structures, An International Journal | Year: 2015

For high-speed railways (HSR) in wind prone regions, wind barriers are often installed on bridges to ensure the running safety of trains. This paper analyzes the effect of wind barriers on the running safety of a high-speed train to cross winds when it passes on a bridge. Two simply-supported (S-S) PC bridges in China, one with 32 m box beams and the other with 16 m trough beams, are selected to perform the dynamic analyses. The bridges are modeled by 3-D finite elements and each vehicle in a train by a multi-rigid-body system connected with suspension springs and dashpots. The wind excitations on the train vehicles and the bridges are numerically simulated, using the static tri-component coefficients obtained from a wind tunnel test, taking into account the effects of wind barriers, train speed and the spatial correlation with wind forces on the deck. The whole histories of a train passing over the two bridges under strong cross winds are simulated and compared, considering variations of wind velocities, train speeds and without or with wind barriers. The threshold curves of wind velocity for train running safety on the two bridges are compared, from which the windbreak effect of the wind barrier are evaluated, based on which a beam structure with better performance is recommended. Copyright © 2015 Techno-Press, Ltd.


Li H.,Beijing Jiaotong University | Li H.,Lehigh University | Xia H.,Beijing Jiaotong University | Xia H.,Beijing Key Laboratory of Structural Wind Engineering and Urban Wind Environment | And 2 more authors.
Engineering Structures | Year: 2015

Stress responses under vehicle loads are of great significance during the life-cycle of a bridge. The accurate identification of these responses is necessary for the bridge design, construction, assessment, maintenance, and rehabilitation. This paper presents a numerical approach for the stress analysis of railway bridges based on train-bridge coupled dynamics. A coupled train-bridge system model composed of a 3D vehicle model, a 3D bridge model established with the direct stiffness method, and an assumed wheel-rail contact relationship considering random excitations due to track irregularities, is developed. Based on the results of the train-bridge coupled analysis, bridge dynamic stress responses are then computed by elastic finite element method. The field measurement data of a 32. m simply-supported concrete bridge on a heavy haul railway is analyzed to validate the accuracy of the proposed approach. Additionally, the effect of two key parameters (i.e., the train speed and track irregularity) of the train-bridge coupled vibration analysis is discussed. The approach is illustrated on an existing railway steel bridge with low lateral stiffness. The stress time histories of bridge members are computed and compared to those obtained by using the moving concentrated load model, with an emphasis on the stress responses induced by lateral vibrations. © 2015 Elsevier Ltd.


Guo W.W.,Beijing Jiaotong University | Guo W.W.,Beijing Key Laboratory of Structural Wind Engineering and Urban Wind Environment | Wang Y.J.,Beijing Jiaotong University | Xia H.,Beijing Jiaotong University | And 2 more authors.
Science China Technological Sciences | Year: 2014

To investigate the aerodynamic effect of wind barriers on a high-speed train-bridge system, a sectional model test was conducted in a closed-circuit-type wind tunnel. Several different cases, including with and without barriers, with different barrier heights and porosity rates, and with different train arrangements on the bridge were taken into consideration; in addition, the aerodynamic coefficients of the train-bridge system were measured. It is found that the side force and rolling moment coefficients of the vehicle are efficiently reduced by a single-side wind barrier, but for the bridge deck these values are increased. The height and porosity rate of the barrier are two important factors that influence the windbreak effect. Train arrangement on the bridge will considerably influence the aerodynamic properties of the train-bridge system. The side force and rolling moment coefficients of the vehicle at the windward side are larger than at the leeward side. © 2014, Science China Press and Springer-Verlag Berlin Heidelberg.


Guo W.-W.,Beijing Jiaotong University | Guo W.-W.,Beijing Key Laboratory of Structural Wind Engineering and Urban Wind Environment | Xia H.,Beijing Jiaotong University | Xia H.,Beijing Key Laboratory of Structural Wind Engineering and Urban Wind Environment | Zhang T.,Dalian Maritime University
Gongcheng Lixue/Engineering Mechanics | Year: 2015

The influences of wind barriers on the aerodynamic effects of a train-bridge system and running safety of a high-speed train on a bridge are analyzed on the basis of a dynamic analysis model for a wind-train-bridge system. Taking a 16 m span simply-supported U-girder bridge located in Baili wind aera on Lanzhou-Xinjiang new high-speed railway as an engineering background, the three-component force coefficients of the train vechicle and the bridge girder were measured with and without barriers by wind tunnel tests. The whole histories of a train passing through the bridge subjected to strong cross winds are simulated, from which the threshold curve of train speed and wind velocity for ensuring the running safety of the train on the bridge is proposed. The numerical results show that the train speed on the bridge should be limited as the wind velocity is over 15 m/s in the case without the wind barriers, whereas with the designed wind barriers, the train can still run safely at 260 km/h on the U-girder bridge even when the wind velocity reaches 40 m/s. ©, 2015, Tsinghua University. All right reserved.

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