Finite Element Analysis Of Bridge Research Articles

Comparison of Analytical and Finite element method of live load distribution in T Beam Girder Bridge

T-Beam bridges are widely used for short span of varying from 12 m to 25 m because of their cost effectiveness despite of its complexity in analysis. Live load distribution is a crucial step in analysis of any type of bridge since it gives force or moment for which bridge components need to be designed. Among the various methods of live load distribution, comparison between Courbon’s Method, Morice-Little method and Finite element method has carried out herein. Present study aims to determine the most appropriate method of Live load distribution in T Beam Girder Bridge. Total eight bridge models were considered for the purpose of analysis with span varying from 12m to 24m i.e., 12m, 16m, 20m and 24m with three and four girders for each span. Finite element software SAP 2000 has used for Finite element analysis of Bridge. Finite element result were compared with Courbon’s method and Morice little method results.

Probabilistic Modeling of Fatigue Damage in Orthotropic Steel Bridge Decks under Stochastic Traffic Loadings

Fatigue truck models with deterministic parameters were developed int a stochastic vehicle flow model. A response surface method was used to approximate the function between vehicle axle weight and equivalent fatigue stresses with few training data to solve the time-consuming problem of bridge finite element analysis under traffic flow loads. A probabilistic fatigue damage modeling method was presented and applied to the rib-to-deck details of steel box girder bridges. Finally, the fatigue damage model was applied to the reliability assessment of steel box girder bridges, and influences of traffic flow parameters on structural fatigue reliability were studied. Numerical results indicate that the higher occupancy rate of heavy vehicle flow in a slow lane than in a fast lane mainly explains the decrease in the fatigue reliability of corresponding rib-to-deck details. The increase in vehicle axle weight causes a rapid decrease in the fatigue reliability index of steel box girders. The fatigue reliability index of rib-to-deck detail in the slow lane decreases from 3.42 to 0.72 when the annual linear growth factor ranges from 0 to 1%. The stochastic fatigue vehicle flow model and the probabilistic model for fatigue damage exhibit considerable potential in the probability assessment of bridge fatigue damage.

The Effect of the Secondary Dead Load on Vibration Characteristics of a Steel Box Girder Footbridge Model

Making field test and finite element simulation on East Third Ring Road Xiaobawang footbridge in Beijing, considering the effect of the deck loads of the bridge on the model calculation results, we can find the effect of the secondary dead load on vibration characteristics of the footbridge model. Comparison of the frequencies of model before and after applying the secondary dead load make us know that applying dead load will lead to the lower frequency of bridge. In the process of the bridge finite element analysis, factors to consider should be more comprehensive and the way to simulation should be more realistic so that the results of finite element simulation can be closer to the actual.

Effect Evaluation of Prestressed Carbon Fiber Plate Reinforced Bridges in Critical Condition

With a bridge which appearing disease cause a insufficient carrying capacity as background, this paper used bridge finite element analysis software combined with field loading test to analyze Prestressed Carbon Fiber Plate reinforcement effect .The results show that the reinforcement method has a remarkable effect in improving the structure stiffness and the natural frequency of vibration , improving the carrying capacity of old bridge and overall security.

Closed Form Solution for Deflection of Flexible Composite Bridges

Simply supported steel-concrete composite beams are widely used in bridge construction. Deflection is the significant parameter for serviceability limit state of bridges. A lot of computational effort is required for finite element analysis of bridges considering flexibility of shear connectors and shear leg effects. Neural network is presented for prediction of deflections, at service load, in simply supported steel-concrete composite bridges incorporating flexibility of shear connectors and shear lag effect. The training, testing and validation data sets for neural network are generated using finite element models. The finite element models have been developed using ABAQUS software. These models have been validated with available experimental results. Closed form solution is also proposed based on the developed neural network. The use of the neural network requires a computational effort almost equal to that required for the simple beam analysis (neglecting flexibility of shear connectors and shear lag effect). The neural network has been validated for number of bridges and the errors are found to be small. The network/closed form solution can be used for rapid prediction of deflection for everyday design.

The Seismic Response Analysis of Continuous Rigid-Frame Bridge - Energy Method

A 3D Finite Element model of a continuous rigid-frame bridge is constructed by the Midas/Civil bridge finite element analysis program in this paper, where fiber elements and plastic hinges are used for bridge piers. The lump mass method is used to simplify the infinite-degree-of-freedom continuous rigid-frame bridge into a multi-degree of freedom model. The energy solution of continuous rigid-frame bridge is given, and the time-history analysis of the bridge is applied. In addition, the energy response of continuous rigid-frame bridge with different pier height and reinforcement ratio are given based on the energy method, revealing the impact of pier height and reinforcement ratio on the displacement and energy response of continuous rigid-frame bridge.

Simulation and Analysis for Externally Prestressed Concrete Bridge Based on ANSYS

The externally prestressed bridge finite element analysis module redeveloped based on ANSYS software is introduced，realizing finite element analysis method for externally prestressed concrete bridge. It is able to build the externally prestressed bridge finite element model, combined with Solid65 and Solid45 simulated concrete, and Link8 or Link10 simulated prestressed tendon. It is also able to bring material and geometric nonlinear effects into the analysis, for analyzing ultimate bearing capacity and local stress characterization of the externally prestressed structure. A bridge model is generated as an example for verifying the application of the module. Based on it, the model then is equipped with different allocation arrangements of internal and external tendons to analyze the mechanical characteristics of externally prestressed concrete bridge. Research is conducted for the effect on ultimate bearing capacity by allocation arrangement of tendons, and providing design suggestion and theoretic basis.

Study on Spatial Stability of Mobile Bailey Truss Structure

Taking the southern approach bridge of Yudong Yangtze River Bridge as the research object,which applies the cast-in-place construction technology to continuous box girder on Bailey beams stent,the stent-reaction forces under different conditions of cast-in-place box girder are obtained through Dr 3.0 bridge finite element analysis software.Then Bailey truss structure model established by ANSYS 9.0 finite element analysis software is applied to check the spatial stability in the construction of Bailey truss structure.The relevant stability coefficients and the corresponding instability modes are obtained.Eventually,relevant recommendations to prevent such instability of Bailey stent are given.

Extending the service life of bridges using continuous decks

The national bridge inventory reveals that our bridges face persistent performance and maintenance problems. One of the major problems is deck joints that often lead to deterioration in their vicinity. Using jointless bridge decks reduces direct and indirect costs associated with bridge maintenance and repair. This paper presents two approaches to investigate the behavior of jointless bridge-deck systems. The first is a detailed nonlinear finite-element analysis of bridges subjected to instantaneous, temperature, and time-dependent effects that is used as a proof of concept, which was validated using published experimental testing results. Key parameters, such as support configurations, time-dependent effects, link-slab stiffness, debonded length, and level of reinforcement, were investigated. Analytical results of modes of failure, deflections, and strains are presented. A simplified method that is more suitable for design purposes is presented and then used to investigate the instantaneous effects of introducing a link slab to six typical reinforced and prestressed concrete bridges. This study suggests that the use of debonded link slabs can be effective in extending the service lives of new or repaired bridges.

Solver and Shell Element Performances for Curved Bridge Analysis

A study has been undertaken to investigate different solver and shell element performances for curved bridge finite-element analysis. Three sparse solvers were implemented into a bridge finite-element analysis code, and the solution times and memory requirements for typical bridges were compared. In addition, the use of four-node and nine-node shell elements in modeling was investigated for different mesh densities. Based on the comparative studies performed, modeling guidelines for practicing engineers have been developed and are presented herein.