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Liu X.-B.,Shijiazhuang University | Liu X.-B.,Hebei Province Key Laboratory of Structural Health Monitoring and Control | Zhang H.-D.,Shijiazhuang University | Wang Y.-B.,Shijiazhuang University
Gongcheng Lixue/Engineering Mechanics | Year: 2015

A pressure-measured sectional model wind tunnel test of a rectangular cylinder with aspect ratio 5 was performed. The changing rule for the spanwise correlation of an aerodynamic force versus a spanwise distance and a wind attacking angle was studied. The study results show that the spanwise correlation coefficient of an aerodynamic force becomes smaller with a larger spanwise distance. Under the same spanwise distance, the spanwise correlation coefficient of a lift force is greatest, the spanwise correlation coefficient of a torque is smaller, and the spanwise correlation coefficient of a drag force is smallest. The spanwise correlation coefficient between a lift force and a torque attains the maximum value in a zero degree wind attacking angle, and it becomes smaller with a larger wind attacking angle. ©, 2015, Tsinghua University. All right reserved. Source


Liu X.-B.,Shijiazhuang University | Liu X.-B.,Hebei Province Key Laboratory of Structural Health Monitoring and Control | Zhang H.-D.,Shijiazhuang University | Wang Y.-B.,Shijiazhuang University
Gongcheng Lixue/Engineering Mechanics | Year: 2016

A sectional model wind tunnel test of a flat box girder in smooth flow was performed and the spanwise correlation of vortex-induced forces was investigated. The study results show that spanwise correlation of lift force becomes weakened with the decrease of vibration amplitudes at vibration amplitude-decreasing stage in lock-in range. At vibration amplitude-increasing stage in lock-in range, with the increase of vibration amplitudes, spanwise correlation of lift force becomes strengthened first and then weakened. The maximum value of spanwise correlation coefficient appears in a wind speed in vibration amplitude-increasing stage, rather than the wind speed corresponding to maximum vibration amplitude; In lock-in range, spanwise correlation of vortex-induced forces of flat box girder is dependent on both vibration amplitude and wind speed in smooth flow. © 2016, Engineering Mechanics Press. All right reserved. Source


Shi C.,Shijiazhuang University | Li Z.-Y.,Shijiazhuang University | Liu Q.-K.,Shijiazhuang University | Liu Q.-K.,Hebei Province Key Laboratory of Structural Health Monitoring and Control
Gongcheng Lixue/Engineering Mechanics | Year: 2015

Non-uniform distribution of snow caused by snowdrift may result in structural damage in snow and wind areas. In order to obtain the simulation and test methods of snowdrift for engineering practice, wind tunnel tests and field observations were used to carry out preliminary research. By wind tunnel tests, we investigated the changing of accumulating thickness of simulating materials with time and wind velocity, and moreover, the effect of bond force on tests results. By field observation, the snow distribution on stepped flat roofs was measured and compared with former research. ©, 2015, Tsinghua University. All right reserved. Source


Qin Q.-W.,Shijiazhuang University | Liu X.-B.,Shijiazhuang University | Liu X.-B.,Hebei Province Key Laboratory of Structural Health Monitoring and Control | Liu Q.-K.,Shijiazhuang University | Liu Q.-K.,Hebei Province Key Laboratory of Structural Health Monitoring and Control
Gongcheng Lixue/Engineering Mechanics | Year: 2016

There are many engineering structures with circular sections. At regular wind speed, the Reynolds number of these structures can reach 107 or more which falls into high supercritical Reynolds number region. However, researches on circular cylinder in this region are few. Based on this situation, the wind load of a single circular cylinder of 5 meters in diameter is studied by numerical calculation. The computational domain, number of circumjacent grid, height of the first normal layer grid and computational time step are examined. The drag coefficient and the flow field distribution around the circular cylinder are obtained. © 2016, Engineering Mechanics Press. All right reserved. Source


Liu Q.-K.,Shijiazhuang University | Liu Q.-K.,Hebei Province Key Laboratory of Structural Health Monitoring and Control | Zheng Y.-F.,Shijiazhuang University | Liu X.-B.,Shijiazhuang University | And 3 more authors.
Gongcheng Lixue/Engineering Mechanics | Year: 2015

Stay-cables are main stressed members of cable-stayed bridges, as the most part of wind loads on a cable-stayed bridge is caused by its cables, it is very important to master the wind forces on cables exactly for bridge design. At the same time, as wind induced cable vibrations happen frequently and cause serious damage to bridges, the mechanisms of vibration are hot problems in the research work of wind engineering, and vibration control methods are key issues to be considered in bridge design. In this paper, wind load calculating methods, types of wind induced vibrations and mechanisms of cables are introduced, and the research achievements of vibration control methods designed from aerodynamic perspective are summarized. It provides a reference for the designing work of vibration control and relevant mechanism research of cables. ©, 2015, Tsinghua University. All right reserved. Source

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