Influence Analysis of Parameters Variation on Dynamic Characteristic for Concrete Filled Steel Tubulur Arch Bridge

2013 ◽  
Vol 361-363 ◽  
pp. 1429-1432
Author(s):  
Hao Sun ◽  
Xiao Gang Li ◽  
Shi Lin Liu
Keyword(s):  
Finite Element ◽  
Dynamic Characteristic ◽  
Yellow River ◽  
Structural Parameters ◽  
Arch Bridge ◽  
Analysis Process ◽  
Cfst Arch Bridge ◽  
Bridge Deck Slabs ◽  
Lateral Rigidity ◽  
Main Bridge

The main bridge of Zhengzhou Yellow River 2nd bridge is a concrete filled steel tubulur (CFST) arch bridge. Choosing the main bridge as the research object, the finite element procedure ANSYS was used to establish the 3D finite element dynamic model. In order to analyze the influence of structural Parameters variation on dynamic characteristic,17 different conditions were considered in the calculation and analysis process. The results show that the CFST arch bridge is a flexible structure. The vertical rigidity of the bridge is stronger than the lateral rigidity CFST arch rib. The changes of the transverse brace style have little effect on the vertical rigidity, but have great impacts on the lateral rigidity of the CFST arch rib. It is sensitive on the first step vibration if the bracing tube damage. But the bracing tube damage has little effect on the vertical rigidity. The damages of suspenders and bridge deck slabs influence weakly on the vibration modes.

scholarly journals Artificial Neural Network-Based Method for Seismic Analysis of Concrete-Filled Steel Tube Arch Bridges

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Zhen Liu ◽  
Shibo Zhang
Keyword(s):  
Neural Network ◽  
Finite Element Method ◽  
Artificial Neural Network ◽  
Finite Element ◽  
Seismic Analysis ◽  
Steel Tube ◽  
Arch Bridge ◽  
Concrete Filled Steel Tube ◽  
Cfst Arch Bridge ◽  
Artificial Neural

Seismic analysis of concrete-filled steel tube (CFST) arch bridge based on finite element method is a time-consuming work. Especially when uncertainty of material and structural parameters are involved, the computational requirements may exceed the computational power of high performance computers. In this paper, a seismic analysis method of CFST arch bridge based on artificial neural network is presented. The ANN is trained by these seismic damage and corresponding sample parameters based on finite element analysis. In order to obtain more efficient training samples, a uniform design method is used to select sample parameters. By comparing the damage probabilities under different seismic intensities, it is found that the damage probabilities of the neural network method and the finite element method are basically the same. The method based on ANN can save a lot of computing time.

Risk Analysis for the Construction Phases of Long-Span CFST Arch Bridge Based on Finite Element Analysis

2011 ◽  
Vol 225-226 ◽  
pp. 823-826
Author(s):  
Yu Feng Zhang ◽  
Guo Fu Sun
Keyword(s):  
Finite Element ◽  
Risk Analysis ◽  
Limit State ◽  
Ultimate Limit State ◽  
Element Analysis ◽  
Nonlinear Buckling ◽  
Finite Element Program ◽  
Arch Bridge ◽  
Cfst Arch Bridge ◽  
Element Program

As a part of virtual simulation of construction processes, this paper deals with the quantitative risk analysis for the construction phases of the CFST arch bridge. The main objectives of the study are to evaluate the risks by considering an ultimate limit state for the fracture of cable wires and to evaluate the risks for a limit state for the erection control during construction stages. Many researches have been evaluated the safety of constructed bridges, the uncertainties of construction phases have been ignored. This paper adopts the 3D finite element program ANSYS to establish the space model of CFST Arch Bridge, and to calculate the linear, the geometrical nonlinear and the double nonlinear buckling safety factors under the six different lode cases. Then the bridge’s risks are evaluated according to the results calculated which provide a reference for design of similar project.

Experimental Research on Special-Shaped CFST Arch Bridge Model

2011 ◽  
Vol 243-249 ◽  
pp. 1835-1841
Author(s):  
Da Peng Gu ◽  
Yan Jiang Chen ◽  
Wei Ming Yan ◽  
Yong Li
Keyword(s):  
Experimental Research ◽  
Model Test ◽  
Static Model ◽  
Bridge Engineering ◽  
Bridge Structure ◽  
Arch Bridge ◽  
Bridge Model ◽  
Cfst Arch Bridge ◽  
National Road ◽  
Main Bridge

The main bridge structure of the bridge engineering cross Yitong river, on the 102 national road, is a three-Span flying swallow type special-shaped CSFT arch bridge. This paper introduces the design, process and results of the static model test of the CFST arch bridge.

Self-Vibration Characteristics Analysis of the Yingzhou Bridge

2011 ◽  
Vol 90-93 ◽  
pp. 1212-1215 ◽  
Author(s):  
Yan Zeng ◽  
Zhi Yong Wang
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Element Analysis ◽  
Arch Bridge ◽  
Subspace Iteration ◽  
Characteristics Analysis ◽  
Set Up ◽  
Three Dimensional Finite Element ◽  
Main Bridge

In this paper dynamic behavior of the Ying Zhou main bridge in Luoyang is studied .The finite element analysis software ANSYS is adopted to set up three-dimensional finite element model of a CFT arch bridge of the main bridge .The natural periods and modes of the CFT arch bridge are calculated by using the subspace iteration method. Meanwhile its modal characteristics are analyzed. Some useful conclusions are got by the calculation and analysis of the bridge for the engineering construction.

Dynamic Model Design and Tests on a Heterotypic CFST Arch Bridge

2011 ◽  
Vol 368-373 ◽  
pp. 563-567
Author(s):  
Yan Jiang Chen ◽  
Wei Ming Yan ◽  
Da Peng Gu ◽  
Yong Li
Keyword(s):  
Dynamic Model ◽  
Model Test ◽  
Dynamic Test ◽  
Bridge Engineering ◽  
Bridge Structure ◽  
Model Design ◽  
Arch Bridge ◽  
Cfst Arch Bridge ◽  
National Road ◽  
Main Bridge

The main bridge structure of the bridge engineering cross Yitong river, on the 102 national road, is a three-Span flying swallow type special-shaped CSFT arch bridge. This paper introduces the design, process and a result of the dynamic model test of the CFST arch bridge, and introduces the dynamic test of the bridge.

scholarly journals Temperature Load Parameters and Thermal Effects of a Long-Span Concrete-Filled Steel Tube Arch Bridge in Tibet

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Tuo Shi ◽  
Jielian Zheng ◽  
Nianchun Deng ◽  
Zheng Chen ◽  
Xiao Guo ◽  
...  
Keyword(s):  
Finite Element ◽  
Thermal Effects ◽  
Thermal Load ◽  
Concrete Strength ◽  
Large Diameter ◽  
Steel Tube ◽  
Arch Bridge ◽  
Concrete Filled Steel Tube ◽  
Average Temperature ◽  
Cfst Arch Bridge

Zangmu Bridge is a concrete-filled steel tube (CFST) arch bridge along the Sichuan-Tibet railway in Tibet, with a main span of 430 m. Owing to the unique temperature conditions in Tibet, there have been no large-scale experimental studies on the thermal load design of CFST bridges in this area. Therefore, to determine the thermal load calculation parameters and thermal effects of Zangmu Bridge, a long-term continuous field test was conducted to measure the temperature variations in a test arch with the same pipe diameter. The test results were then compared with current design specifications and relevant literature. Finally, the thermal effects in a CFST arch bridge were analysed using the finite element method. According to the results, the following recommendations were made: (1) the average temperature of concrete in the pipe after the formation of concrete strength should be used to calculate the closure temperature of CFST arch bridges in Tibet; however, the standard calculation formula was still applicable; (2) the daily average temperature in extreme weather should be taken as the maximum and minimum effective temperature; (3) we presented recommended values for the influence range and gradient temperature for a single large-diameter pipe; and (4) a refined finite element model that included the arch base should be used to verify the temperature effects during bridge design.

scholarly journals Static and dynamic evaluation of a butterfly-shaped concrete-filled steel tube arch bridge through numerical analysis and field tests

2021 ◽  
Vol 13 (9) ◽  
pp. 168781402110446
Author(s):  
Gang Wu ◽  
Wei-Xin Ren ◽  
Ya-Fei Zhu ◽  
Syed M Hussain
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Finite Element Model ◽  
Field Tests ◽  
Element Model ◽  
Steel Tube ◽  
Model Errors ◽  
Arch Bridge ◽  
Concrete Filled Steel Tube ◽  
Cfst Arch Bridge

The butterfly-shaped concrete-filled steel tube (CFST) arch bridge is an irregular bridge with unique esthetics. In this paper, this new shape of CFST arch bridge is introduced, and a refined three-dimensional finite element model (FEM) is established to evaluate static and dynamic behavior of the bridge. In order to reduce model errors, the FEM is calibrated according to numerical analysis and field tests. Static calculation results show that the butterfly-shaped bridge has good structural performance. The bending moment and axial force of the arch ribs increase when the camber angle of suspender changing from 15° to 50°. Dynamic test is carried out by ambient vibration testing under traffic and wind-induced excitations. The modal parameters of the bridge were calculated by the stochastic subspace identification method in the time domain. In terms of natural frequencies and mode shapes, the FEM analysis was validated by experimental modal analysis. The updated model thus obtained can be treated as a baseline finite element model, which is suitable for long term monitoring and safety evaluation of the structure in different severe circumstances such as earthquakes and wind loading in future.

Effect of Suspender Tension Order on the Natural Vibration Frequency of a Through CFST Arch Bridge

2012 ◽  
Vol 204-208 ◽  
pp. 2153-2156
Author(s):  
Zi Lin Li ◽  
Shuai Wang
Keyword(s):  
Finite Element ◽  
Vibration Frequency ◽  
Natural Vibration ◽  
Reference Value ◽  
Steel Tube ◽  
Natural Vibration Frequency ◽  
Arch Bridge ◽  
Cfst Arch Bridge ◽  
Element Theory ◽  
Change Curve

Finite element theory was taken to do a research on a through CFST (concrete-filled steel tube) arch bridge and a change rule of the bridge’s natural vibration frequency was found when its suspenders were tensioning. Through three tension schemes, after solving the first fifteen orders of the natural vibration frequency of each condition and drawing the change curve and analyzing the effect of different suspender tension order on the natural vibration frequency, we come to the conclusion: different suspender tension order will have no effect on the natural vibration frequency when the bridge is completed but when it is constructing, which mainly shows that both the first three and eight to thirteen orders of the natural vibration frequency are discrepant; different location of suspenders has different affection degree on the natural vibration frequency of the bridge. The conclusion has reference value for bridge construction.

Analysis of magnetic force and dynamic characteristic for non-contact permanent magnet linear drive device

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1337-1345
Author(s):  
Chuan Zhao ◽  
Feng Sun ◽  
Junjie Jin ◽  
Mingwei Bo ◽  
Fangchao Xu ◽  
...  
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Dynamic Characteristic ◽  
Driving Force ◽  
Magnetic Circuit ◽  
Response Speed ◽  
Computation Method ◽  
Element Analysis ◽  
Element Simulation ◽  
The Relationship

This paper proposes a computation method using the equivalent magnetic circuit to analyze the driving force for the non-contact permanent magnet linear drive system. In this device, the magnetic driving force is related to the rotation angle of driving wheels. The relationship is verified by finite element analysis and measuring experiments. The result of finite element simulation is in good agreement with the model established by the equivalent magnetic circuit. Then experiments of displacement control are carried out to test the dynamic characteristic of this system. The controller of the system adopts the combination control of displacement and angle. The results indicate that the system has good performance in steady-state error and response speed, while the maximum overshoot needs to be reduced.

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