Mechanical Characteristics Analysis of Sensitive Parameters of Long-Span Steel Truss Suspension Bridge

2011 ◽  
Vol 250-253 ◽  
pp. 3381-3386 ◽  
Author(s):  
Da Wang ◽  
Yi Zhou Zhu
Keyword(s):  
Free Vibration ◽  
Vibration Frequency ◽  
Mechanical Characteristics ◽  
Suspension Bridge ◽  
Vibration Characteristics ◽  
Structure Parameters ◽  
Long Span ◽  
Main Cable ◽  
Free Vibration Frequency ◽  
Central Buckle

In order to study the influences of structure parameters on the structure mechanical characteristics of long-span suspension bridge. The Shiduhe bridge in Hubei Province was taken as the background of this study, The influence on structure line shape and free vibration characteristics of suspension bridge with the change of structure parameters was studied. The results show that main cable stiffness not only has greater effect on the structure shape of long-span suspension bridge, it also has obvious impact on structure free vibration frequency, in addition, the torsion displacement of stiffening girder can be reduced effectively by adding central buckle, it improves structure bending and torsion stiffness significantly, central buckle also can improve free vibration frequency of structure and enhance structure dynamic stability, It shows that the influencing factors of structure static characteristics are restricted by rigidity of main cable, free vibration characteristics are affected by main cable and central buckle, they are not very sensitive to the variations of the parameters of suspender cable, stiffening girder and main tower.

Influence of Central Buckle on Dynamic Behavior of Long-Span Suspension Bridge with Deck-Truss Composite Stiffening Girder

2013 ◽  
Vol 838-841 ◽  
pp. 1096-1101 ◽  
Author(s):  
Feng Jiang Qin ◽  
Jin Di ◽  
Jie Dai ◽  
Guang Ling Li
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
Great Influence ◽  
Suspension Bridge ◽  
Element Model ◽  
Vibration Modes ◽  
Element Analysis ◽  
Long Span ◽  
Main Cable ◽  
Central Buckle

A 3-D finite element model for Yueyang Dongting Lake bridge was established with a large scale general finite element analysis software, and the subspace iteration method was adopted to analyze the natural vibration characteristics of the bridge, meanwhile, the influences of settings different types of central buckles at the mid-span of the main spans between the main cables and girder on the dynamic behaviors of the long-span suspension bridge with deck-truss composite stiffening girder were studied. The results show that compared with only setting short hanger cable at mid-span, the the whole rigidity of suspension bridge is raised and the natural frequencies increase by the setting central buckle, but various types of vibration modes are affected in different extents; among all of these vibration modes, the antisymmetric vibration and Longitudinal floating of stiffening girder are most obviously affected. The stiffness of central buckle has a great influence on the vibration of main cable, while compared with only setting short hanger cable, the vibration of main cable increases 7.32% while setting the rigid central buckle. The conclusions of this paper provide theoretical basis for the using of central buckle in long-span suspension bridge.

Central Buckle Influence Research on Dynamical Characteristics of Suspension Bridge

2013 ◽  
Vol 405-408 ◽  
pp. 1489-1493
Author(s):  
Da Wang ◽  
Chun Miao Chen ◽  
Yang Liu
Keyword(s):  
Natural Frequency ◽  
Mechanical Characteristic ◽  
Vibration Frequency ◽  
Suspension Bridge ◽  
Bridge Structure ◽  
Coupled Vibration ◽  
Dynamical Characteristics ◽  
Long Span ◽  
The Stability ◽  
Central Buckle

In order to study the influence of the central buckle to the long-span suspension bridge structure mechanical characteristic, the Siduhe Bridge in Hubei Province was taken as the research background, the study were carried on the vibration characteristics, the driving comfort and the vehicle-bridge coupled vibration, which effected by the central buckle of the long-span suspension bridge. The results show that the central buckle has great impact on the large-span suspension bridge natural frequency, the central buckle can large extent increase the structure rigidity, improve the structure self-vibration frequency, and enhance the stability. The vehicle has good comfortable performance when droved on the bridge, and the central buckle has less effect on the comfortable quality. The central button setting can effectively reverse the lower stiffening girder displacement, and improve the stability of the bridge traffic.

Dry Friction Effect on the Work of Viscous Torsion Damper

2016 ◽  
Vol 817 ◽  
pp. 13-18
Author(s):  
Celina Jagiełowicz-Ryznar
Keyword(s):  
Friction Coefficient ◽  
Free Vibration ◽  
Friction Force ◽  
Vibration Frequency ◽  
Forced Vibration ◽  
Dry Friction ◽  
Viscous Damper ◽  
The Real ◽  
Free Vibration Frequency ◽  
Marine Engines

The results of crankshaft forced vibration calculations, including the dry friction force which can be formed in the viscous damper bearing sliding, were presented. This problem concerns the big dampers used in the marine engines. The friction force influence is presented using the function {sign}. Low values of friction coefficient, corresponding to the conditions similar to the real ones, were assumed. In the range of tested value, it was found that the vibration increases linearly, and system free vibration frequency doesn’t change practically.

Analytical methods for the assessment of hanger forces of a suspension bridge based on measured main cable configuration

2019 ◽  
Vol 23 (7) ◽  
pp. 1423-1437
Author(s):  
Wen-ming Zhang ◽  
Gen-min Tian ◽  
Hai-xia Zhao ◽  
Zhi-wei Wang ◽  
Zhao Liu
Keyword(s):  
Vibration Frequency ◽  
Suspension Bridge ◽  
Critical Parameters ◽  
Geometric Condition ◽  
Suspension Bridges ◽  
Horizontal Force ◽  
Frequency Method ◽  
Mechanical Condition ◽  
Reduced Gradient Method ◽  
Main Cable

The accurate measurement of the hanger tensile forces of suspension bridges is crucial for construction control and bridge maintenance. However, the commonly used vibration frequency method is not applicable to the short-hanger force assessment. The configuration of the main cable of a suspension bridge is closely related to hanger forces so that the main cable configuration can reflect the hanger forces. Based on the multi-segment catenary theory, this study proposed an analytical algorithm for the reverse assessment of hanger forces based on the measured configuration data of the main cable. First, the relationship between the hanger force and two critical parameters, that is, the horizontal force of the main cable and the catenary parameter, is established, in which the influence of the saddle arc on the main cable configuration is considered. Then, the horizontal force of the main cable is used as the breakthrough point, and a geometric condition (measuring the coordinates of a non-hanging point on the main cable) or a mechanical condition (measuring the tension of a long hanger by the vibration frequency method) is added. Using the nonlinear generalized reduced gradient method, the nonlinear equations are solved, and all hanger forces are identified. The proposed method feasibility and effectiveness are proved using a suspension bridge with a main span of 730 m as an example. The results show that the algorithm of adding a mechanical condition is lower in sensitivity, less affected by the accuracy of the additional condition, higher in precision, and easier to control, comparing to that of adding a geometric condition. Meanwhile, the horizontal force of the main cable and each hanger force exhibit a nearly perfect linear correlation.

Wind Tunnel Studyon Vortex-Induced Vibration Characteristics of Long-Span Suspension Bridges with Single Cable Plane

2014 ◽  
Vol 633-634 ◽  
pp. 1263-1266
Author(s):  
Huang Yu
Keyword(s):  
Wind Tunnel ◽  
Suspension Bridge ◽  
Wind Tunnel Experiment ◽  
Vibration Characteristics ◽  
Torsional Stiffness ◽  
Suspension Bridges ◽  
Vortex Induced Vibration ◽  
Long Span Bridges ◽  
Wind Speeds ◽  
Long Span

For modern long-span bridges, both the optimization of aerodynamic shape and the increase of torsional stiffness according to the result of the wind tunnel experiment could avoid the flutter instability.Vortex-inducedvibration with relatively large amplitude happens easily at low wind speeds. In this paper, based on wind tunnel experiment, by studying on the vortex-induced vibration characteristics of a long-span suspension bridge with single cable plane, aerodynamic measures for easing the vortex-induced vibration are given.

Isospectral Euler-Bernoulli beams with continuous density and rigidity functions

1987 ◽  
Vol 413 (1844) ◽  
pp. 235-250 ◽  
Keyword(s):  
Boundary Condition ◽  
Free Vibration ◽  
Exact Solutions ◽  
Vibration Frequency ◽  
Flexural Rigidity ◽  
Homogeneous Case ◽  
Continuous Density ◽  
Free Vibration Frequency ◽  
End Conditions ◽  
Vibration Frequency Spectrum

Isospectral systems are those that have exactly the same free-vibration frequency spectrum with respect to a given boundary condition configuration. In this paper, seven different classes of inhomogeneous Euler-Bernoulli beams with continuous density and flexural rigidity functions are found that are analytically solvable and that are isospectral with a homogeneous beam in the clamped-clamped configuration. Of these exact solutions, one class is isospectral with the homogeneous case in all ten distinct configurations obtainable from clamped, sliding and two antiresonant end conditions, whereas another class is isospectral in the six configurations with clamped, hinged or free end conditions. A connection with inverse problems is discussed.

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