Finite Element Analysis on Incremental Launching Construction for Steel Box Girder

2013 ◽  
Vol 671-674 ◽  
pp. 974-979
Author(s):  
Jie Dai ◽  
Jin Di ◽  
Feng Jiang Qin ◽  
Min Zhao ◽  
Wen Ru Lu
Keyword(s):  
Finite Element ◽  
Bending Moment ◽  
Internal Force ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
Steel Box Girder ◽  
Maximum Value ◽  
Negative Bending

For steel box girder of cable-stayed bridge, which using incremental launching method, during the launching process, structural system and boundary conditions were changing, structure mechanical behaviors were complex. It was necessary to conduct a comprehensive analysis on internal force and deformation of the whole structure during the launching process. Took a cable-stayed bridge with single tower, double cable planes and steel box girder in China as an example; finite element software MIDAS Civil 2010 was used to establish a model for steel box girder, simulation analysis of the entire incremental launching process was carried out. Variation rules and envelopes of the internal force, stress, deformation and support reaction were obtained. The result showed that: the maximum value of positive bending moment after launching complete was 60% of the maximum value of positive bending moment during the launching process. The maximum value of negative bending moment after launching complete was 78% of the maximum value of negative bending moment during the launching process.

A Method for Determining the Value of m Based on PLAXIS Nonlinear Finite Element Analysis

2011 ◽  
Vol 250-253 ◽  
pp. 1483-1488
Author(s):  
Jin Song Gui ◽  
Zhen Guo Li ◽  
Qing Meng ◽  
Bo Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bending Moment ◽  
Nonlinear Finite Element Analysis ◽  
Internal Force ◽  
Nonlinear Finite Element ◽  
Maximum Displacement ◽  
Element Analysis ◽  
Finite Element Software ◽  
Selection Of

The value selection of m has a greater influence on the internal force of pile. So, how to determine the value of m is very important for the “m” method. In this paper, a geotechnical finite element software PLAXIS is used for the nonlinear finite element analysis of elastic long pile under the horizontal force action. By using the calculated maximum bending moment and the maximum displacement at the ground, and combined with the related formula for “m” method given in 《Code for Pile Foundation of Harbour Engineering》, a more accurate value of m can be obtained conveniently. Because this method is simple and practical, it can provide a useful reference for the project designer to determine a reasonable value of m.

The Finite Element Analysis on Shear-Lag Effect of the Steel Box-Girder

2013 ◽  
Vol 671-674 ◽  
pp. 815-819
Author(s):  
Yi Sheng Li ◽  
Jun Ping Wang ◽  
Wei Liu ◽  
Jian Ming Shen
Keyword(s):  
Finite Element ◽  
Effective Width ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Software ◽  
Steel Box Girder ◽  
Lag Effect ◽  
The Finite Element Analysis

The shear-lag effect of steel box-girder is qualitatively analyzed by using the finite element software ANSYS. Various methods to reduce the shear-lag effect are studied, and the most effective method is changing the web layout and increasing the number of box-room among them. The suggested value of effective width to thickness ratio b1/t1 of the flange without considering the shear-lag effect are obtained in this paper.

scholarly journals Static Experiment and Finite Element Analysis of a Multitower Cable-Stayed Bridge with a New Stiffening System

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaowei Wang ◽  
Yingmin Li ◽  
Weiju Song ◽  
Jun Xu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Internal Force ◽  
Element Analysis ◽  
Cable Stayed Bridge ◽  
Practical Engineering ◽  
Static Experiment ◽  
Stiffening Effect ◽  
Better Than ◽  
Cable Stayed Bridges

Based on the stiffness limitations of the midtower in multitower cable-stayed bridges, a new stiffening system (tie-down cables) is proposed in this paper. The sag effects and wind-induced responses can be reduced with the proposed system because tie-down cables are short and aesthetic compared with traditional stiffening cables. The results show that the stiffening effect of tie-down cables is better than that of traditional stiffening cables in controlling the displacement and internal force of the bridge based on a static experiment and finite element analysis. Therefore, the proposed system can greatly improve the overall stiffness of a bridge, and its stiffening effect is better than that of traditional stiffening cables in controlling the displacement and internal force. The results provide a reference for the application of such systems in practical engineering.

Fatigue Evaluation of Flat Steel Box Girders with Closed Stiffeners of Large-Span Suspension Bridges under Different Heavy Trucks

2011 ◽  
Vol 147 ◽  
pp. 157-160 ◽  
Author(s):  
Yong Zeng ◽  
Hong Mei Tan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cross Section ◽  
Suspension Bridges ◽  
Box Girders ◽  
Element Analysis ◽  
Box Girder ◽  
Fatigue Assessment ◽  
Steel Box Girder ◽  
Flat Steel

Due to its outstanding aerodynamic shape and light weight, the trapezoidal cross-section flat steel box girder with orthotropic decks and thin-walled longitudinal stiffeners of trapezoidal cross section are widely used in long-span suspension bridges in the world. However, because of the geometrical characteristics and the relative flexibility of their components, these structures may be quite susceptible to traffic loadings that fatigue cracks tend to appear in these structures. In this paper, Jiangyin Bridge is used as a case study to investigate the fatigue performance of the steel girders of suspension bridge Jiangyin Bridge is the second longest bridge in China, which has the main span of 1385m. The stress analysis of steel box girders is firstly carried out based on the analysis of fatigue life. Fatigue assessment method is proposed on the basis of in-situ measurement data combined with finite element analysis. A complete fatigue assessment is made in this paper. Key words: flat steel box girder; orthotropic decks; finite element analysis; fatigue assessment

Optimization of Stay Cables in the Double-Set Arch Pylon Cable-Stayed Bridge

2014 ◽  
Vol 711 ◽  
pp. 495-498
Author(s):  
Shi Xiang Hu ◽  
Wen Gang Ma ◽  
Min Luo
Keyword(s):  
Bending Moment ◽  
Original Design ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
Stay Cables ◽  
Bending Strain ◽  
The Difference ◽  
Negative Bending ◽  
Cable Forces

The determination of post-tensioning cable forces is one of the most important issues for the design of arch pylon cable stayed bridge. In this paper, the optimization module implemented in MATLB, together with the commercial finite element software MIDAS, were employed to evaluate the minimum bending strain energy of the bridge. After optimizing the cable forces, the bending moment of the pylons were bigger than the values of original design. The bending moment of the main arch pylon within 55m to 70m height increased by 7280 kN•m, and the bending moment of the auxiliary arch pylon within 30m to 60m height increased by 3926 kN•m .The stress of the pylons was still far below the allowance value when the obtained cable forces were applied. However, for the girder, the difference between the maximum positive and maximum negative bending moments due to dead load can be lessened greatly by the application of the obtained cable forces. The results obtained revealed that the method presented could make full use of cable forces and lead to optimal structural performance.

The Effect of Bearing Simulation on Vibration Characteristics of a Steel Box Girder Footbridge Model

2014 ◽  
Vol 1049-1050 ◽  
pp. 392-397
Author(s):  
Ju Bing Zhang ◽  
Ying Zou ◽  
Xian Zhang
Keyword(s):  
Finite Element ◽  
Beam Element ◽  
Simulation Methods ◽  
Box Girder ◽  
Vibration Signals ◽  
Finite Element Software ◽  
Steel Box Girder ◽  
Bridge Model ◽  
Element Simulation ◽  
Bridge Bearing

The measurement and finite element simulation was used to research the effect of bearing on vibration frequency of bridge. Sixteen models accelerometer was instrumented on the bridge and the vibration signals were acquired at a sampling frequency of 512 Hz. The finite element software is adopted to establish the model of the bridge. In this paper, beam element simulation and elastic connection simulation are two ways to calculate the vibrational frequencies. Through comparison, the characteristics of the two simulation methods can be known. By this study, the bridge bearing simulation model of the bridge has an obvious impact on the frequency of bridge model. At the same time, the simulation of bridge should be as close to the reality as possible to obtain more accurate data.

The Finite Element Analysis on Mechanical Properties of the Meridians Stair Skeleton of Medical Exhibition Center in Taizhou City

2011 ◽  
Vol 147 ◽  
pp. 140-144
Author(s):  
Jia Zhu Xue ◽  
Yv Zhang Chi ◽  
Xiang Cao Zhi
Keyword(s):  
Finite Element ◽  
Axial Force ◽  
Engineering Application ◽  
Bending Moment ◽  
Steel Structure ◽  
Internal Force ◽  
Mechanical Transmission ◽  
Element Analysis ◽  
Standard Requirement ◽  
Skeleton Structure

The alien space meridians stair steel structure is first adopted in Taizhou medical city exhibition center project. Based on the finite element calculation method for curved beam element stiffness matrix, convergence standard controls and iteration method of solving the modification and optimization in this paper, the complex alien space meridians framed calculation model is built, and the distribution of axial force and bending moment distribution of the stairs meridians skeleton structure are calculated, and the position and numbers are determined. Numerical results show that the maximum space alien meridians stair axial force is 34.5 KN and maximum bending moment is 5.9 KN•m, which satisfy the standard requirement, then the size curvature big, mechanical transmission line complex and local internal force big technology problem skeleton structure have been solved .Therefore, a strong engineering application value achieves in this paper.

Parametric Analysis on Incrementally Launched Construction for Concrete Box Girder

2013 ◽  
Vol 838-841 ◽  
pp. 231-236 ◽  
Author(s):  
Ya Jun Wang ◽  
Jie Dai ◽  
Feng Jiang Qin
Keyword(s):  
Parametric Analysis ◽  
Bending Moment ◽  
Internal Force ◽  
Structural Behavior ◽  
Stiffness Ratio ◽  
Dead Load ◽  
Box Girder ◽  
Negative Bending ◽  
Girder Bridge ◽  
Main Girder

The structural behavior of incrementally launched bridges in the construction stages depends on different parameters. Internal force of main girder is influenced by the dead load and stiffness of main girder, the length and stiffness of launching nose. Parametric analysis on the effect of internal force of an 8×60m-span concrete continuous box girder bridge was carried out. The results show that bending moment increases following the increase of weight and stiffness of corresponding segment of main girder. The phenomenon is even more obvious in the negative bending moment region of main girder segment nearby the launching nose. The bending moment of main girder reduces significantly when the stiffness ratio among launching nose and main girder is less than 0.15. While, the negative bending moment of main girder reduces significantly when the length ratio among launching nose and main span is more than 0.58.

The Nonlinear Finite Element Analysis of Prestressed Concrete Box Girder

2013 ◽  
Vol 361-363 ◽  
pp. 1384-1388
Author(s):  
Meng Chan Zhou ◽  
Qun Yang Liu ◽  
Jun Su
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Maximum Stress ◽  
Nonlinear Finite Element ◽  
Structure Model ◽  
Construction Process ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Software ◽  
Control Section

Using Midas/Civil, a nonlinear finite element software, to establish solid element, analyse the process of the construction of a prestressed concrete simply supported box girder which length 32m, this box girder is located on the Shijiazhuang-Wuhan Passenger Dedicated Line, gained the maximum stress and displacement at the control section. Comparative analysis of the simulation results with the monitoring data which gained at the construction site, The results of both are substantially the same, achieve the purpose of assessing the safety of the construction process and the reasonableness of the structure model about the box girder.

MIDAS-Based Finite Element Analysis of the Short Line Method of the Precast Segmental Bridge Construction

2014 ◽  
Vol 580-583 ◽  
pp. 3093-3097
Author(s):  
Lin Kun Guan ◽  
Xie Dong Zhang ◽  
Hui Lei
Keyword(s):  
Finite Element ◽  
Simulation Analysis ◽  
Internal Force ◽  
Light Rail ◽  
Bridge Construction ◽  
Element Analysis ◽  
Maximum Deformation ◽  
Short Line ◽  
Finite Element Software ◽  
Line Method

This paper studies the precast and cantilever erection process of pre-stressed concrete continuous beam bridge alignment control in short line method, basis on the construction of a light rail. Various stages of bridge construction performed on simulation analysis and calculated by the finite element software MIDAS, concluded the ultimate internal force and deformation values, and the maximum deformation are within the scope of design elevation deviation 20 mm allowed, as to achieve the target of bridge assembly.

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