高位锁定形态栈桥的风荷载研究  

Research on the Wind Load of the Trestle Bridge Locked in a High Position

作　　者：李红梅[1] 方兴[1] 宣言[1] 王澜[1] 

机构地区：[1]中国铁道科学研究院铁道科学技术研究发展中心,北京100081

出　　处：《中国铁道科学》2012年第6期30-35,共6页China Railway Science

基　　金：铁道部科技研究开发计划项目(2012G003-D);北京市市政科技发展计划项目(1029YF0705)

摘　　要：针对中铁渤海铁路轮渡码头汽车栈桥的高位锁定形态,运用大型计算流体动力学软件CFX,数值模拟不同侧风条件下汽车栈桥的三维外流场,研究不同风速及不同风向角条件下高位锁定形态栈桥的风荷载。结果表明:在同一风速下,风向角对高位锁定形态下栈桥所受的风压极值影响较小;处于高位锁定形态的栈桥,在10～30m·s-1风速下,风向角为45°时水平来流产生的合力最大,因此,应按照45°风向角时水平来流所产生的最大合力且考虑扭转力矩,进行汽车栈桥高位锁定形态下的设计计算;不同风向角时,高位锁定形态下栈桥所受横向风力、竖向风力、扭转力以及风压均随风速的增大而增大,且与风速的平方成正比,这与水平形态桥梁结构的规律相同。According to the form of the automobile trestle bridge locked in a high position of China Railway Bohai ferry pier, the three-dimensional external flow field of automobile trestle bridge under different crosswind conditions was numerically simulated by large computational fluid dynamics software CFX. The wind load of the trestle bridge locked in a high position under different wind speeds and wind angles were researched. The results show that the wind angles have small influence on the wind pressure extreme val- ues of the trestle bridge locked in a high position under same wind speed. Under 10- 30 m · s-1 wind speed, the resultant forces of the trestle bridge locked in a high position are maximum when the wind angle of the horizontal flow is 45°. So, the design calculations of the trestle bridge locked in a high position should be considered in accordance with the maximum resultant forces and torsional moments when the wind angle of the horizontal flow is 45°. Under different wind angles, the horizontal wind forces, vertical wind forces, torsional moments and wind pressure increase with the increase of wind speed, and are proportional to the square of wind speed; these laws are identical with the laws of the bridge structure of horizontal form.

关 键 词：汽车栈桥 高位锁定形态 风荷载 风速 风向角 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]