Nonlinear dynamic performance of long-span cable-stayed bridge under traffic and wind

被引:18
作者
Han, Wanshui [1 ]
Ma, Lin [2 ]
Cai, C. S. [3 ]
Chen, Suren [4 ]
Wu, Jun [1 ]
机构
[1] Changan Univ, Highway Coll, Xian 710064, Shaanxi, Peoples R China
[2] Hohai Univ, Dept Civil & Environm Engn, Nanjing 210098, Jiangsu, Peoples R China
[3] Louisiana State Univ, Dept Civil & Environm Engn, Baton Rouge, LA 70803 USA
[4] Colorado State Univ, Dept Civil & Environm Engn, Ft Collins, CO 80523 USA
基金
美国国家科学基金会;
关键词
bridges; long span; traffic; geometric nonlinearity; aerodynamic nonlinearity; wind field; nonlinear iteration method; SUSPENSION BRIDGES; COUPLING SYSTEM; TURBULENT WIND; VEHICLE; SIMULATION;
D O I
10.12989/was.2015.20.2.249
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Long-span cable-stayed bridges exhibit some features which are more critical than typical long span bridges such as geometric and aerodynamic nonlinearities, higher probability of the presence of multiple vehicles on the bridge, and more significant influence of wind loads acting on the ultra high pylon and super long cables. A three-dimensional nonlinear fully-coupled analytical model is developed in this study to improve the dynamic performance prediction of long cable-stayed bridges under combined traffic and wind loads. The modified spectral representation method is introduced to simulate the fluctuating wind field of all the components of the whole bridge simultaneously with high accuracy and efficiency. Then, the aerostatic and aerodynamic wind forces acting on the whole bridge including the bridge deck, pylon, cables and even piers are all derived. The cellular automation method is applied to simulate the stochastic traffic flow which can reflect the real traffic properties on the long span bridge such as lane changing, acceleration, or deceleration. The dynamic interaction between vehicles and the bridge depends on both the geometrical and mechanical relationships between the wheels of vehicles and the contact points on the bridge deck. Nonlinear properties such as geometric nonlinearity and aerodynamic nonlinearity are fully considered. The equations of motion of the coupled wind-traffic-bridge system are derived and solved with a nonlinear separate iteration method which can considerably improve the calculation efficiency. A long cable-stayed bridge, Sutong Bridge across the Yangze River in China, is selected as a numerical example to demonstrate the dynamic interaction of the coupled system. The influences of the whole bridge wind field as well as the geometric and aerodynamic nonlinearities on the responses of the wind-traffic-bridge system are discussed.
引用
收藏
页码:249 / 274
页数:26
相关论文
共 36 条
[1]   THE QUANTIFICATION OF RISK FOR ROAD VEHICLES IN CROSS WINDS [J].
BAKER, CJ .
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, 1994, 52 (1-3) :93-107
[2]  
Bucher C.G., 1987, J ENG MECH, V12, P2055
[3]   Framework of vehicle-bridge-wind dynamic analysis [J].
Cai, CS ;
Chen, SR .
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, 2004, 92 (7-8) :579-607
[4]   Simulation of stochastic wind velocity field on long-span bridges [J].
Cao, YH ;
Xiang, HF ;
Zhou, Y .
JOURNAL OF ENGINEERING MECHANICS, 2000, 126 (01) :1-6
[5]  
Chen A.R., 2005, P IABSE S INT ASS BR
[6]  
Chen A.R., 2004, REPORT WIND TUNNEL E
[7]   Equivalent wheel load approach for slender cable-stayed bridge fatigue assessment under traffic and wind: Feasibility study [J].
Chen, S. R. ;
Cai, C. S. .
JOURNAL OF BRIDGE ENGINEERING, 2007, 12 (06) :755-764
[8]   Modeling stochastic live load for long-span bridge based on microscopic traffic flow simulation [J].
Chen, S. R. ;
Wu, J. .
COMPUTERS & STRUCTURES, 2011, 89 (9-10) :813-824
[9]   Dynamic Performance Simulation of Long-Span Bridge under Combined Loads of Stochastic Traffic and Wind [J].
Chen, S. R. ;
Wu, J. .
JOURNAL OF BRIDGE ENGINEERING, 2010, 15 (03) :219-230
[10]   Accident assessment of vehicles on long-span bridges in windy environments [J].
Chen, SR ;
Cai, CS .
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, 2004, 92 (12) :991-1024