Study of the Aerodynamic Measures Impact on Flutter Stability of Steel Truss Suspension Bridge

2013 ◽  
Author(s):  
Bai Hua ◽  
Huang Sen hua ◽  
Li Jia wu
Keyword(s):  
Suspension Bridge ◽  
Steel Truss

Research on the Aerodynamic Measures Impact on Flutter Stability of Steel Truss Suspension Bridge

2013 ◽  
Vol 791-793 ◽  
pp. 378-381
Author(s):  
Hua Bai ◽  
Sen Hua Huang
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Suspension Bridge ◽  
Wind Tunnel Experiment ◽  
Attack Angle ◽  
Torsional Stiffness ◽  
Critical Wind Speed ◽  
Guide Plate ◽  
Steel Truss ◽  
Better Than

The flutter stability of the steel truss suspension bridge is hard to reach the requirement of the wind resisting stability when lacks the torsional stiffness. This paper discusses the influence of aerodynamic measure combination, such as central stabilizer, air director enclosed anti-collision bar and so on, towards the flutter stability of steel truss through the wind tunnel experiment of the bridge of Liu Jia gorge. The result shows: the effect of using both the upper and lower stabilized plate is better than separated used it. when sectionalized dispose upper stabilized plate, the flutter critical wind speed of attack angle will decrease rapidly. Outlaying the horizontal guide plate is better than internally installed; The flutter stability of different attack angle tend to be balanced by widening the horizontal guide plate. The anti-collision bar can be functionalized as the central stabilizer by heightening and enclosing, and effectively increase the critical wind speed of different attack angles of the high truss suspension bridge.

Application of the Track-Cable Erecting System for Steel Truss Girder in Aizhai Suspension Bridge

2012 ◽  
Vol 204-208 ◽  
pp. 2056-2060
Author(s):  
Nian Chun Deng ◽  
Xian Hui Liu ◽  
Nian Lai Zhang ◽  
Liu Yi Wu
Keyword(s):  
Engineering Application ◽  
Suspension Bridge ◽  
Scale Model ◽  
Steel Truss ◽  
New Construction ◽  
Main Cables ◽  
Steel Truss Girder ◽  
Main Bridge ◽  
Bearing Structure ◽  
Cable Tracking

Aizhai Bridge is a stiffening steel truss girder suspension bridge and the main bridge consists of three spans of 242m+1176m+116m. It flies over Dehang Canyon, which is cliffy and steep, the depth between the designed elevation and the ground is 355 meters. In order to overcome the problems happened during the transportation, a new construction plan for the erection of steel truss girder is developed, combining the lifting technology with the cable-tracking transportation. Simply speaking, main cables and hangers are used as bearing structure, the track cables hanged on the hangers are used as transportation track. The transport vehicles system run along the tracking cables to deliver the steel truss girder, and the deck unit erecting system do the lifting job. In this paper, the scale model experiment and full scale model test of the track-cable transferring system are introduced, the design and test of erection gantry for deck unit are described. Finally, the engineering application of the track-cable erecting system is described. The results of experiment and engineering application show that the transportation and erection work of steel truss girder can quickly be completed by using the new construction plan. It is safe and economic solution, and has very broad prospect and practical value for the construction of suspension bridge and arch bridge.

Experimental Investigation into Aerodynamic Stability of Narrow Steel Truss Girder Suspension Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 938-941
Author(s):  
Hua Bai ◽  
Jia Wu Li
Keyword(s):  
Wind Tunnel ◽  
Geographical Location ◽  
Wind Tunnel Test ◽  
Suspension Bridge ◽  
Mitigation Measures ◽  
Aerodynamic Stability ◽  
Steel Truss ◽  
Section Model ◽  
Wind Climate ◽  
Steel Truss Girder

A narrow steel truss girder suspension bridge was designed for pedestrian and livestock in pasture in Xinjiang Province, China. For the complex wind climate at bridge site, the cautious designers resorted to wind tunnel test to confirm the aerodynamic stability of the bridge. The analysis and results from wind tunnel test conducted in Chang’an Wind Tunnel Laboratory indicated the original scheme must be changed considerably to improve the aerodynamic stability under action of wind. Considering the shape feature of Siudirgol Bridge and its geographical location, section model with such mitigation measures as auxiliary cables and central buckles were re-tested in wind tunnel joint with analysis. The auxiliary cables and central buckles can increase considerably the fundamental frequency of the bridge and hence the critical wind speed of flutter.

Incremental Launching Construction Method for Steel Truss Suspension Bridge

2011 ◽  
Vol 204-210 ◽  
pp. 842-845
Author(s):  
Kai Ming Xu
Keyword(s):  
Suspension Bridge ◽  
Linear Analysis ◽  
Construction Method ◽  
Western China ◽  
Suspension Bridges ◽  
Practical Application ◽  
Construction Methods ◽  
Steel Truss ◽  
Non Linear ◽  
Traditional Construction

For steel truss suspension bridges, traditional construction methods always have their disadvantages. This paper firstly points out the limitations of the traditional construction methods (such as the erection gantry method and the deck crane method). As the solutions, incremental launching method is proposed. Then, as an example based on a certain suspension bridge in Western China, non-linear analysis is carried out in order to illuminate how to decide the important parameters in practical application. Some further problems are discussed at the end.

Research on the Influence of the Aerodynamic Measure on the Flutter Derivative of the Steel Truss Suspension Bridge

2012 ◽  
Vol 532-533 ◽  
pp. 252-256
Author(s):  
Hua Bai ◽  
Wei Guo ◽  
Wei Li ◽  
Yu Li
Keyword(s):  
Wind Velocity ◽  
Suspension Bridge ◽  
Gansu Province ◽  
Attack Angle ◽  
Segment Model ◽  
Steel Truss ◽  
Critical Wind Velocity ◽  
Flutter Derivative ◽  
Vibration Tests ◽  
Structure Setting

Flutter derivative is a significant index of the structure flutter stability. Identifying flutter derivative precisely contributes to the bridge flutter stability analyzing. In this paper, we take a research on the Liujiaxia Bridge in Gansu Province, China. Different flutter derivatives, which were got via segment model vibration tests with different aerodynamic measures, were classified, and made comparison in order to get the law of how different aerodynamic measures effect on the flutter derivative. The results show that, setting central stabilized plate, Build-in deflector, flange plate all affect flutter derivative significantly, which leads to changes in the flutter critical wind velocity of the structure. Setting central stabilized plate above the deck contributes to identify the flutter derivative of the 0° and positive attack angle, while setting central stabilized plate will contribute to flutter derivative identification at negative angles. It will make it difficult to identify the flutter derivative at 0° and -3° if the built-in deflector was set. Wind plate contributes to the identification of the flutter derivative at +3°, however, it will make it harder to identify the flutter derivative at 0° and -3°.

Research on Factors of Flutter Critical Velocity in Suspension Bridge Stiffened with Steel Truss

2011 ◽  
Vol 250-253 ◽  
pp. 1988-1995
Author(s):  
Ji Hong Bi ◽  
Chun Sheng Shu
Keyword(s):  
Critical Velocity ◽  
Frequency Ratio ◽  
Theoretical Basis ◽  
Suspension Bridge ◽  
Design Parameters ◽  
Critical Factors ◽  
Steel Truss ◽  
Structural Measures ◽  
Classical Flutter ◽  
Optimization Of Design Parameters

Take the Liujiaxia bridge as engineering background. Based on classical flutter theory, It focus on research critical factors which affect the critical velocity about the ultra-narrow steel truss stiffening girder suspension bridge in order to provide theoretical basis to the problem of low flutter stability of Liujiaxia bridge. The results show that critical velocity will decrease with increase about the vertical bending frequency and will increase with the torsion frequency and torsion-bend-frequency ratio. But the critical velocity will keep stabilize when torsion-bend-frequency ratio exceeds than 1.2. Though Changing sag-span ratio, width and height of beam can improve the critical velocity, it maybe increase cost of bridge remarkably when width and height of beam reach to some level. It is uneconomic if only adopting structural measures by means of optimization of design parameters, as a result, aerodynamic measures is more important.

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.

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