Buffeting response of a suspension bridge in complex terrain

2016 ◽  
Vol 128 ◽  
pp. 474-487 ◽  
Author(s):  
Etienne Cheynet ◽  
Jasna Bogunović Jakobsen ◽  
Jónas Snæbjörnsson
Keyword(s):  
Complex Terrain ◽  
Suspension Bridge ◽  
Buffeting Response

Research on Simplifying the Buffeting Response Spectrum of Suspension Bridge

2013 ◽  
Vol 791-793 ◽  
pp. 370-373
Author(s):  
Hua Bai ◽  
Yue Zhang
Keyword(s):  
Response Spectrum ◽  
Damping Ratio ◽  
Suspension Bridge ◽  
Concrete Bridges ◽  
Main Beam ◽  
Response Analysis ◽  
Long Span Bridges ◽  
Buffeting Response ◽  
Long Span ◽  
The Impact

In order to solve the problem of traditional buffeting analysis method is complex, the paper summarizes a calculation method of simplifying the suspension bridge buffeting response spectrum which considers the background response by simplifying the vibration mode function. Examples calculation shows that this function is efficient and accurate. With this method the paper analyzes the impact of parameters including structural damping ratio, aerodynamic admittance function, pneumatic self-excited forces, the main beam span and so on on the suspension bridge buffeting response. Results show that: First, the impact of the background response on concrete bridges with larger damping ratio cannot be ignored. Second, when aerodynamic admittance takes Sears function, the buffeting response analysis results may be partial dangerous. Third, the role of the background response on large long-span bridges of more than 2000 m can be ignored.

Time-Domain Analysis of Wind-Induced Response of a Suspension Bridge in Comparison With the Full-Scale Measurements

2017 ◽  
Author(s):  
Jungao Wang ◽  
Etienne Cheynet ◽  
Jasna Bogunović Jakobsen ◽  
Jónas Snæbjörnsson
Keyword(s):  
Standard Deviation ◽  
Time Domain ◽  
Measurement Data ◽  
Suspension Bridge ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Full Scale ◽  
Buffeting Response ◽  
Non Linear ◽  
The Time Domain

The present study compares the buffeting response of a suspension bridge computed in the time-domain with full-scale measurement data. The in-service Lysefjord Bridge is used as a study case, which allows a unique comparison of the computational results with full-scale buffeting bridge response observed during a one year monitoring period. The time-domain analysis is performed using a finite element approach. Turbulent wind field is simulated according to the governing bridge design standard in Norway for three different terrain categories. The time-domain analysis indicates that the non-linear components of the wind loading are of limited importance in the present case, contributing by less than 5% to the standard deviation of the lateral displacement. The contribution of the buffeting loads on the main cables, hangers and towers to the lateral dynamic response of the bridge girder is about 6%. With the time-domain method, mode coupling as well as the influence of cables and towers are well captured in the simulation results. The buffeting response, estimated in terms of the standard deviation of acceleration, is found to be in good agreement with the field measurement data. Comparison suggests that the proposed numerical method, with the non-linear force model, is able to predict the bridge response reasonably well.

Passive Winglet Control of Flutter and Buffeting Responses of Suspension Bridges

2018 ◽  
Vol 18 (05) ◽  
pp. 1850072 ◽  
Author(s):  
Duc-Huynh Phan
Keyword(s):  
Passive Control ◽  
Suspension Bridge ◽  
Suspension Bridges ◽  
Aerodynamic Stability ◽  
Buffeting Response ◽  
Flutter Speed ◽  
Numerical Research ◽  
Control Devices ◽  
Supply Systems ◽  
Energy Supply Systems

The passive control using winglets has been considered to be an alternative solution for control of flutter and buffeting responses of long suspension bridges. This method is aimed at not only developing lightweight, reduced-cost stiffening girders without adding stiffness for aerodynamic stability, but also avoiding problems from malfunctions caused by the control and energy supply systems of active control devices by winglets. This paper presented a mechanically controlled approach using the winglets, for which a two-dimensional bridge deck model was numerically and experimentally studied. In addition, numerical research on the flutter and buffeting passive control of a 3000[Formula: see text]m span suspension bridge was carried out. The result showed that the flutter speed of the suspension bridge increases, whereas the buffeting response decreases, through the implementation of the winglets.

Buffeting Time-Domain Analysis of Long-Span and Slender Suspension Bridge with a Steel Truss Stiffened Girder

2012 ◽  
Vol 178-181 ◽  
pp. 2183-2186
Author(s):  
Xiu Juan Jiang ◽  
Jun Yan Wu ◽  
Jian Xin Liu
Keyword(s):  
Suspension Bridge ◽  
Time Domain Analysis ◽  
Horizontal Wind ◽  
Buffeting Response ◽  
Long Span ◽  
Steel Truss ◽  
Overall Evaluation ◽  
High Degree ◽  
Bridge Tower ◽  
Natural Wind

Consideration of natural wind related features, improved use of the harmonic synthesis, along with a high degree of change Simiu spectrum and Lumley-Panofsky spectrum as the goal of full-bridge stochastic wind field were simulated, generating a bridge structure of discrete points of vertical and horizontal wind pulse of time. Carried on the simulation using large universal finite element ANSYS, and the overall evaluation structure’s geometry misalignment, the host cable bridge tower wind load, the effective wind angle of attack’s influence, has calculated of the beam self-excited forces and obtained the long-span and slender suspension bridge with steel truss stiffened girder buffeting response result.

Buffeting Internal Force Response Analysis for Stable Type Suspension Bridge

2013 ◽  
Vol 444-445 ◽  
pp. 32-36
Author(s):  
Meng Xi Geng ◽  
Ben Ning Qu ◽  
Jiao Long Peng ◽  
Xiao Chun Wang
Keyword(s):  
Finite Element ◽  
Suspension Bridge ◽  
Element Model ◽  
Internal Force ◽  
Response Analysis ◽  
Stable Type ◽  
Buffeting Response ◽  
Finite Element Software ◽  
Set Up ◽  
Fluctuating Wind

According to the definition of the Buffeting, it is caused by a fluctuating wind. Since fluctuating wind is wind speed changing with time in the atmosphere, it will cause the vibration of the structure. And pulsating wind reflects the atmospheric boundary layer wind disturbance and randomness. In the paper, Stable Type Suspension Bridge (STSB) is researched for buffeting problem. A finite element model of the bridge is set up using the finite element software. The buffeting response of the bridge is calculated and studied. The influence of the opposite tensional structures in the bridge on buffeting response of the bridge is assessed.

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