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EVENTS
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Past Webinar I Past Expert Q&A I Past Workshop I Past Expert Tips
Webinar
MIDAS Bridge Series: Performance-Based Seismic Design as per CSA S6-19
In this 3-part series, MIDAS will be touching on the theories and practical applications of Performance-Based Seismic Design (PBSD) focusing on the three methodologies of Response Spectrum, Pushover, and Non-linear Time History analysis as per Canadian standards. As one of the most significant design changes brought into Canada to assess and manage the risks brought by seismic events, the series will delve into the fundamental principles, applications, and setup within a numerical model. Key Takeaways: ⭐Understanding the three methodologies for PBSD for bridge structures as per CSA S6-19.⭐Learn to compute demand drifts by conducting response spectrum analysis.⭐Learn how to determine capacity drift through Inelastic Static Pushover Analysis.⭐Learn how to capture strains under various performance levels with Nonlinear Time-History Analysis. The files used for the series can be downloaded below: Session 1 Material Session 2 Material Session 3 Material
MIDAS EXPERT NETWORK: Effects of Long-Term Deformations on Geometrically Complex Bridges
In this session, MIDAS Expert Percy Penafiel, PE, at Nevada Department of Transportation, focuses on the effects of long-term deformations on geometrically complex bridges. We look at how NVDOT uses shrinkage and creep deformations, which were calculated to demonstrate how these deformations can affect other bridge components in cases where the geometry of the bridge is complex. This work was based on an existing bridge located in Las Vegas. The bridge was built in 1995. Over the years, the bridge was inspected noticing large deformations at the expansion joints along with strip seal failures, cracks in wingwalls and shear keys. These repairs generated additional maintenance cost that could be avoided using sophisticated analysis during the design phase. It should be noted that software capabilities as today were not available at that time. MIDAS Civil was used to model the bridge and results were compared to simplify methods. Key Takeaways: ⭐Understand deformations and their impact on other bridge components, particularly in complex bridge geometries.⭐Identify large deformations at expansion joints, strip seal failures, cracks in wing walls, and shear key issues.
Midas Expert Webinar: Analysis and Design of Post-tensioned Straddle Concrete Bents using Midas Civil
In this session, Top MIDAS Expert Amir Botros, Senior Structural Engineer at Jacobs focuses on Analysis and Design of Post-tensioned Straddle Concrete Bents using Midas Civil Post-tensioned Straddle bents provide a structural and cost-efficient alternative to traditional reinforced concrete bents when it comes to long-span bents, generally 65 feet to 110 feet or longer, combined with limitations on the depth of the bent. This presentation highlights different modeling techniques that can be used to analyze and design post-tensioned Concrete Bents using Midas Civil. The session focuses on procedures for performing construction staged analysis for post-tensioned bents designed to straddle underlying railroad tracks. Determining the bent section dimensions, appropriate layout and profile of the tendons, and the bent/column connection type are considered key factors for an efficient design. Key Takeaways: ⭐Different modeling techniques that can be used to analyze and design post-tensioned.⭐Performing construction staged analysis for post-tensioned bents designed to straddle underlying railroad tracks.⭐Determine bent section dimensions, appropriate layout, and profile of tendons.
Tips for Managing Data for Bridge Analysis Results
In this webinar, Zac Taylor P.E., structural engineer from Kimley-Horn, will be giving out some tips for managing data from analysis results. He will show you his way of organizing data from midas Civil output and interpret the analysis output efficiently.
Application of Links in Bridge FE Models
This webinar will include a discussion on the most commonly used types of links in bridge engineering industry. The webinar speaker, Luis Vila from GM2 Associates, will talk about the appropriate applications of various types of links in midas Civil.
Load Rating of Curved and Complex Geometry Composite Steel Bridges
Tom Less will expand the knowledge of Two-Dimensional/Grillage Modeling and Three-Dimensional Modeling and show how he sets up the inputs like rating design code, rating parameters, unbraced length, fatigue parameter, etc., for bridge rating design.
Redundancy Analysis of twin steel box girder bridges
Demonstrating redundancy for a dual steel box girder system involves-in-depth structural analysis and may require enhancements to certain structural details.
Seismic Design of Concrete Bridges
There are differences between building a new bridge and widening or replacing an existing bridge. When you build a new bridge, there are more alternative options and fewest constraints.
Constructability of Curved Steel Tub Girders
Seth Greenberg, P.E. from Jacobs, presented the lesson about Constructability of Curved Steel Tub Girders. Tub girders had the complex geometry which was difficult to fabricate. Engineers determined to use tub girders due to its higher torsional rigidity. Seth Greenberg explained the reason for using tub girders, the nuances between different model types, and introduced his favorite features of MIDAS Civil for tub girder construction phases.
Elkhorn Drop Ramp Structure Lessons Learned
When it comes to complex geometry many engineers struggle while using grillage approach or using plate modeling. That was the issue that some engineers at Nevada DOT were facing, until Percy was able to use MIDAS Civil and MIDAS FEA to do both approaches easily.
Soil Foundation Structure Interaction and Ground Motion Selection
Structural dynamic using the beam-spring model and non-linear time history analysis is currently recognized as one of the most accurate tools for seismic design and analysis of bridge structures.
Best Practices When Considering Post-Tensioned Girder Bridges
Continuous post-tensioned bridges are very efficient structures. By eliminating the need for deck joints, this requires less maintenance, which is a significant saving in the long-term.
Load Testing, Evaluation, and Load Rating Of Movable Bridge
As special as movable bridges are, learning techniques from experts could help you have a broader view and more insight of your project. So we want to invite you to our live webinar with Dr. Liang.
Automation Of Refined Grillage Model For Multi-Girder Bridges
In case if you have piles of works waiting for you to return to the office, we want to recommend you to watch Dr. Lin's webinar! During the presentation, Dr. Lin will guide you through Bridge Automation that will make your current modeling & design process in Midas Civil more efficient. A must-learn-skill for MIDAS users or high-productivity-seekers!
Contrasting SOE Design Methodologies and Implications
In this Midas Webinar Session, our Expert Engineer Parsa Heydarpour from Subsurface and Tunnel Engineering shared his knowledge on how to do a comparative analysis between three SOE Design approaches – Traditional, 3D FEA, and 2D FEA – for a conventional shaft structure, to showcase key advantages and limitations of each design.
Past Expert Q&A
Expert Q&A: Steel Composite Girder Bridges
In this Midas Q&A Session, our Expert Engineer Yasser Al-Anany from Wood shared his knowledge and answered questions about steel composite girder bridges. For all North America engineers, you can also join our next workshop sessions by signing up here www.midasoft.com/midas-expert-network
Expert Q&A: Steel Straddle Bents
In this Q&A Live Session, our Expert Engineer, Siddharth Patil from White Hawk Engineering & Design helped answer the questions from our users about the Steel Straddle Bents in midas Civil. For all North America engineers, you can also join our next Q&A session by signing up here www.midasoft.com/midas-expert-network
Expert Q&A: Post-tensioned Straddle Bents
In this Q&A Live Session, our Expert Engineer, Zac Taylor from Kimley-Horn helped answer the questions from our users about the Post-tensioned Straddle Bents. For all North America engineers, you can also join our next Q&A session by signing up here www.midasoft.com/midas-expert-network
Construction Stage Analysis of Irregular Geometry Structures
In this Q&A Live Session, our Expert Engineer, Percy Penafiel from Nevada DOT helped answer the questions from our users about the Construction Stage Analysis of Irregular Geometry Structures.
Pushover Analysis
With more users asking us questions regarding pushover analysis and its applications in midas Civil, we want to share the answers to some of these common questions to our user community.
Construction Stage Analysis Part I
In this Q&A Live Session, our Expert Engineer, Amir Botros from SDR Engineering helped answer the questions from our users about the Construction Stage Analysis.
Construction Stage Analysis Part II
In this Q&A Live Session, our Expert Engineer, Amir Botros from SDR Engineering helped answer the questions from our users about the Construction Stage Analysis.
Modeling Technique In Midas Civil
In this Q&A Live Session, our Expert Engineer, Zac Taylor from Kimley-Horn helped answer the questions from our users about the Modeling Technique in Midas Civil. For all USA engineers, you can also join our next Q&A session by signing up here
Past Workshops
Webinar: Different Types of Bridge Modeling with Construction Stage - Complex Bridges
In this workshop, Top MIDAS Expert Amir Botros, Senior Structural / Bridge Engineer at Stantec presented on the second part of his previous workshop on Different Types of Bridge Modeling with Construction Stage for Complex Bridges. For all North American engineers, you can also join our next sessions by signing up here www.midasoft.com/midas-expert-network.
Webinar: 2D Excavation Supported by Tiebacks & Rakers
In this workshop, Top MIDAS Expert Parsa Heydarpour Ph.D., P.E., M.ASCE , Project Engineer at Subsurface and Tunnel Engineering presented on 2D excavations supported by tiebacks and rakers. For all North American engineers, you can also join our next sessions by signing up here www.midasoft.com/midas-expert-network .
Workshop: Application of Boundary Conditions
In this workshop session, our Top Expert Engineer Zac Taylor, a Structural Engineer at Kimley-Horn presented on the application of boundary conditions using midas Civil. For all North American engineers, you can also join our next webinar sessions by signing up here www.midasoft.com/midas-expert-network.
Time-dependent Material For Prestressed Concrete Bridge Construction Staged Analysis
In this Midas Workshop Session, our Expert Engineer, Benjamin Blasen from Jacobs shared his knowledge and experience on Time-Dependent Material for Construction Stage Analysis in midas Civil.
Post-Tensioned Structure Construction Staged Analysis
In this Midas Workshop Session, our Expert Engineer, Daniel Baxter from Michael Baker International shared his project experience about Post-tensioned Structure Construction Staged Analysis.
Shaft Excavation With Corrugated Metal Sheets And Steel Ribs
In this Midas Workshop Session, our Expert Engineer Parsa Heydarpour from Subsurface and Tunnel Engineering shared his knowledge about Shaft Excavation With Corrugated Metal Sheets and Steel Ribs (with and without dewatering).
How to Complete a Model with a Construction Stage Analysis
In this Midas Workshop, our Expert Engineer Amir Botros from Stantec shared his knowledge about Construction Stage Analysis.
Expert Tips
New Modeling Approach For Tunnels Under Complex Ground and Loading Conditions
With the help of Tarcisio Barreto Celestino and Antonio Bobet, our MIDAS Expert Osvaldo Paiva Magalhães Vitali took on a new approach using midas GTS NX on tunnels with complex ground and loading conditions. In their recent publication in the Soils and Rocks Journal, we can see how they used
Modeling Steel Fracture for Redundancy Analysis Using Detailed Finite Element Method
What is Bridge Redundancy?
Bridge redundancy is the capacity of the structure to carry loads after the structure is damaged or after one of its members ruptures. The manual for Bridge Evaluation (2008) defines bridge redundancy as the “capacity of the bridge to carry loads after damage or the failure of one or more
How to Perform Time-Dependent Analysis
How to Perform Time-dependent Analysis?
Mainly there are two ways to perform the time-dependent analysis. One is the time-step analysis and the other is the age-adjusted method. The age-adjusted method is a simplified one and can consider the long-term effects with only a one-step analysis. Of course, this is an approximate way
Determining Concurrent Live Load for Strut and Tie Models
In the article "strut-and-tie modeling for pier caps", we have discussed the definition of strut-and-tie analysis and how to construct a strut-and-tie model using the example of pier cap. After creating the geometry of a strut-and-tie model, the next step usually is calculating dead and live loads from the superstructure. This article discusses how to determine the
Strut-and-Tie Modeling for Pier Caps
What is Strut-and-Tie Analysis? What are "Struts" and "Ties" in Struct-and-Tie Analysis?
Struct-and-tie analysis visualizes the flow of forces through any type of concrete element in the form of internal truss. The tensile members of the internal truss are called "ties" and the compressive members of the internal truss are called "struts" in
Convergence Study In Curved Girder Analysis
What is Convergence? What is Convergence Study?
It is easy to obtain the result from bridge finite element analysis, but to get more accurate results requires extra efforts. Even the most robust finite element analysis solvers adopts the method that approximates the structural behavior, by minimizing the associated error function compared
Composite Bridge Modeling Tips
How to Model the Girder and Deck Connection in Composite Bridge?
The way to simulate the connection between the girder and the deck will depend on how we construct the model. In the 2D all-frame composite bridge model shown in figure 1, all the elements are connected in the grid within the same plane. Because it was modeled with...
Nonlinearities in Cable-Stayed Bridge Analysis
Why is cable-stayed bridge difficult to analyze? Cable-stayed bridges, including so-called Extradosed bridges, do not have any classical solutions. Computer based displacement method is the only way to analyze cable-stayed bridges and it is hard to check the output. Also, in the cable-stayed bridge analysis, the following three nonlinearities should
Posting a bridge? Think about the alternatives
Bridge load posting – identifying just how much weight a bridge can bear – is a matter of public safety and a way to safeguard vital transportation infrastructure. However, load posting is less straightforward than it may seem. Not posting a bridge can create safety issues for the motoring public, while posting makes transportation more difficult for large, heavy vehicles and the industries that use them.
Geometric Nonlinearity Explained
From the previous tip basic nonlinear analysis explained, Dr. Seungwoo Lee talked about some fundamental differences between linear and nonlinear analysis in structural engineering. In a linear analysis, the relationship between the stress and strain of a model is held constantly, and the stiffness matrix of the model stays the same throughout the analysis.
Time Dependent Material in Time Step Method
When we talk about prestressed concrete, the things that we are mostly concerned about are the compressive strength gain with respect to time, and the prestressing tendon relaxation with respect to time. Figure 1 shows various time-dependent effects for concrete including creep and shrinkage. The factors that affect the creep rate
Insertion Points, and Beam End Release
For structures with stability issues, one way to check which specific link is causing the problem is start with a constrained model and begin relaxing its DOFs gradually. When you are releasing the DOFs and when you are running into stability issues, you would know which link release is causing that instability.
Types of Links in Midas Civil
This piece of tip talks about different types of links that you can find in midas Civil and their applications. You may be wondering what are the implications of using one type of link compared to another, this tip will answer that for you and help you gain more confidence when choosing the link types.
Why Post Tensioning An Arch Bridge?
In the design project to replace the old Fulton Road arch bridge in Cleveland, OH, Michael Baker Intl engineer Daniel Baxter and his team has designed a 1,568-foot-long replacement structure for the original arch bridge, which retains the original design of six 210-foot-long concrete deck arch spans. For the replacement bridge structure, a precast, post-tensioned concrete arch bridge design was selected. You may be asking yourself, why post-tensioning the arch bridge?
Warping Stress in Midas
In typical engineering practices, engineers are used to having six degrees of freedom (DOFs) for modeling and analysis, three for rotations and three for translation. However, additional advanced beam elements can include other DOFs to represent the warping of an open thin-walled cross section. Such elements are not commonly available in professional software.
Irregular Bridges
There are times when engineers would have to design and evaluate bridge structures that fall outside of the AASHTO design guideline. Therefore, when do we define a structure as irregular? How is evaluating an irregular bridge different from evaluating a regular bridge? How to minimize errors during the construction of irregular bridges?
Speed Up Pre-and-Post-Processing of Analysis
Our Midas Civil software is versatile and very compatible with other software and Excel. This feature really useful to help engineers work faster on their project. Our Expert Engineer Seth Greenberg from Jacobs shared his tips to work faster with Midas Civil.
Query Tools, MCT Command Shell, Frame&Plane Thickness
Midas Civil has so many features that can help you to work efficiently in your project. Our Expert Engineer Benjamin Blasen from Jacobs shared his quick tips in Midas Civil. The tips/tricks he has found very useful are the Query tools, using the MCT command shell, and turning on the display of frame and plane thicknesses in the Hidden Option Display menu.
Nodes and Elements
There are so many ways to help you save your time when you are working on your bridge project. One of the easy tips is renumbering of the nodes and elements. Our Expert Engineer Tom Less, P.E., a Senior Associate, Team Leader & Bridge/Structural Engineer from Woolpert shared his tips for nodes and elements.
Complex Bridge
A complex bridge is one of the most common engineering projects nowadays. This category of structures includes movable, cable-stayed, segmental concrete, and other bridges with unusual characteristics. These types of structures will require specialized expertise to design and build. One of our Expert Engineers, Yazeed Abuhassan, a Structural Design Engineer from Bergmann PC, shared his tips about
Plastic Hinges
In this session, Yong Yang, principal structural engineer from Jacobs, will be demonstrating how plastic hinges can be set up quickly by the automatic determination of cross-sectional properties and member material through midas Civil's general section design (GSD) module.
Can We Perform Shear Design With a Single Input?
Believe it or not, once upon a time, there were no computers available for us, bridge engineers. At that time, we had to perform every calculation by hand using calculators or even slide-rules. It was quite dull and time-consuming. Now all we have cutting-edge computers, which is way better than those we used when we landed at the Moon. Everything looks nice, and life seems beautiful, doesn't it?
