Interpretation of Dynamic Eigenvalue Analysis in Bridges

Why do we need pushover analysis?

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Dynamic Analysis of Fan, Semi-Fan, and Harp Type of Cable-Stayed Bridges

While modeling cable-stayed bridges, the different types of cable arrangements such as Fan, Semi-Fan, and Harp type is often considered. Since they vary in cable arrangement, the pretension in the cables is different and the deflection, bending moment, and stresses vary in the bridge. It then becomes prudent to choose the best arrangement for a more optimized design leading to lesser cost and increased safety.

In this article, we present, in a concise way, the modeling of a Cable-Stayed Bridge in midas civil with three different cable arrangements. Furthermore, Response Spectrum analysis is carried out on the models to study the Dynamic Responses of the three arrangements.

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Table of Contents 

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1. Introduction

2. When to go for Dynamic analysis?

3. Case Study

4. Conclusion

High-speed rail is becoming increasingly popular worldwide. Many countries are investing in high-speed rail as a way to reduce travel times, improve transportation efficiency, and reduce dependence on automobiles and air travel. The growth of high-speed rail has been driven by factors such as increasing urbanization, population growth, and the need to reduce carbon emissions from transportation.

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The fatigue analysis is one of the assessment methods of bridges. Time History Analysis can be used to calculate the fatigue stresses. In this course, we tried to broaden your understanding of functions that are for time history analysis in midas Civil. In addition, we walked through in detail the process of time history analysis. It will be helpful to most of the bridge engineers who handle the time history analysis.

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Steel composite footbridge Morava project is presented in this session. The structure is described with interesting remarks from the assembly. Practical experience on how to design footbridges that are sensitive to the load imposed by pedestrians is shared. After this session, bridge engineers will understand more deeply how to deal effectively with dynamically loaded bridges.

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Moving loads are one of the most important factors in the bridge design. In this course, we tried to broaden your understanding of vehicle loads to get accurate moving load results. Additionally, we discussed in detail how moving loads affect the analysis results depending on how define traffic line lanes and vehicles are defined. It will be helpful to most bridge engineers who handle moving load factors on a daily basis.

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In this webinar, we will introduce the midas Civil application of the transverse analysis of prestressed concrete box girder in the cable-stayed bridge. 

This case study highlights

1. Modeling Concept

2. Considered Load Case with Functions in midas Civil

3. Considered Boundary Conditions with Functions in midas Civil

4. Post-processing and Other Modeling Applications

The example structure below is the Saemangeum bridge in South Korea. This project is a preliminary design. The structure is a cable-stayed bridge with concrete superstructures, pylons, and piers. The superstructure is composed of pre-stressed concrete girders. The transverse analysis was carried out in midas Civil.