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Prestress does not remain constant with time. Prestress loss is nothing but the reduction of initial applied prestress loss to an effective value. Loss of prestressing affects the strength of members and also significantly affects the member’s serviceability. Prestress loss is classified into two types:

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This case study covers the following aspects:

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Influence line & surface analysis are moving load analysis techniques for bridges used in many structural analysis programs. In this post, we will try to understand the basic contents of these two interpretation techniques.

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When a static concentrated load is applied on a deck, the deck will deflect transversely as well as longitudinally, similar to the structural behavior of a two-way slab. The load distribution becomes more complex when multiple point loads are applied to the deck, such as truck loads. When the structural model is simplified to a 2D frame model, it is important to obtain the resulting 3D forces from the 2D model.

We have reviewed more than 10 well-written blog posts and 15 video contents that introduce must-have skills for Bridge engineers. So, here we listed up the top 4 most featured skills and 4 more major skills that MIDAS civil experts think every successful Bridge engineer must-have.

1. Project management and leadership skills

As you may know, only licensed civil engineers are allowed to sign final design documents for infrastructure projects. This is because they are the only ones who can confirm whether the design complies with all standards and safety regulations. Therefore, civil engineers are the center of the entire project’s design and implementation. While you develop a career as a junior engineer, you will learn how to lead clients, managers, planners, technicians and provide them with appropriate guidance for a given project.

2. Finding Errors & Omissions

Bridge engineers can prevent a number of errors in projects by evaluating the work of others. According to McGraw Hill Construction’s report, “Managing Uncertainty and Expectations in Building Design and Construction (2014)”, Errors & Omissions are the top concerns for business owners. 80% of surveyed owners responded that additional work and costs are inevitable if there are errors & omissions present in a given project. We think this situation is no different in Bridge design and construction.

It requires years of experience in various projects to find errors and suggest cost-effective solutions to partakers. Having hands-on experience on the newest and most advanced software tools (CAD or CAE) can help you save time and minimize errors by providing features in various processes such as design checks and load rating.

 The Andy Warhol Bridge is an eyebar-chain, self-anchored suspension bridge carrying Seventh Street over the Allegheny River in the city of Pittsburgh, PA. This bridge is one of the "Three Sisters" bridges constructed from 1924 to 1928 which comprise the only trio of identical, side-by-side bridges in the world and the first self-anchored bridges constructed in the United States.

With the advent of the IT era in the 21st century, information that was previously unavailable in the engineering market has become possible. Engineering simulation using a computer program is one of them, and it is currently used in most engineering industries.

Loading on structures can be idealized as static loads and are one of the major issues for structures. It makes permanent deformations to structures during the service period. The dead loads can be applied in the structural analysis as static loads. The static loads include nodal loads, distributed loads, and pressure loads in the structural analysis software. midas Civil also provides various load types to cover various loading conditions. In this webinar, we will examine how static load types are applied and which static load types are available.

This webinar shows a case study about the steel composite ladder deck girder bridge. The webinar will highlight major factors to consider in the design of this type of bridge, such as shear lag and buckling effects. It will provide recommendations on the suitability and use of different model types. Since many ladder deck bridges are constructed using the push launch method, special considerations for the construction sequence will be discussed.  

Material properties must be applied when performing analysis. midas Civil provides 'Material Properties' function to define various materials. Some users who are a beginner or are not familiar with midas Civil might be confused while defining a material property because there are various options. These options are used for linear analysis or nonlinear analysis and those are used or not depending on the purpose of analysis.

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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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Example #1. Integral bridge on piled bank seats 

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In May 2020,  we hosted a webinar, “Mastering midas Civil : Geometry Modeling Techniques for Bridge Engineers Seeking for More" by Jihoon Kang, Training Manager/MIDASIT.

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When you start learning new software, the first thing is to get fully accustomed to its graphical user interface (GUI). The GUI is a point of interaction between a user and software. A complete understanding of the GUI means that the user takes the full advantage of the software's features.
In this session, we introduced the features and the basic skills of using midas Civil's GUI. By becoming familiar with midas Civil interface, the user will confidently build a model and perform numerical analysis.

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A girder bridge is one of the most common types of bridge design. Prestressing a composite girder in the negative moment region increases its stiffness by preventing cracking of concrete under service loads. In this webinar, we share the design practices of girder span bridges in Sarawak and show which functions of midas Civil can be utilized for the effective modeling of this type of structure.