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    Global FEM Online Workshop Series 2025 Seismic Fluid-Structure Interaction of Concrete Gravity Dams: A Numerical Approach in FEA NX

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    AI Summary
    • Compares conventional methods such as Westergaard’s and Zanger’s approaches with the Sloshing Fluid method for seismic analysis.
    • Explains how sloshing behavior influences dam performance under earthquake loading.
    • Demonstrates advanced numerical modeling of fluid-structure interaction (FSI) in FEA NX.
    • Highlights limitations of simplified hydrodynamic assumptions and the need for dynamic fluid representation.
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    Webinar Slides

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    What You'll Take Away

    Limitations of conventional hydrodynamic methods

    Principles of fluid-structure interaction under seismic loading

    Numerical modeling strategies for sloshing fluid effects

    Application of FEA NX for dam-reservoir interaction analysis

    Description

    The seismic behavior of concrete gravity dams is significantly influenced by the interaction between the reservoir and the dam structure. While traditional methods such as Westergaard’s and Zanger’s approaches have been widely adopted, they often oversimplify the problem by neglecting the dynamic interaction between the fluid and the structure.

    In contrast, the Sloshing Fluid method, which models the reservoir as a dynamic fluid medium capable of interacting with the dam, offers a more accurate and physically realistic representation of this interaction. This webinar will explore the seismic fluid-structure interaction (FSI) using advanced numerical modeling in FEA NX, with a focus on how sloshing behavior affects dam performance during earthquake events.

    Join us to learn how modern FSI techniques are reshaping seismic analysis of dam structures.

    Who Should Attend

    • Structural/Dam and Geotechnical Engineers involved in dam design and seismic assessment

    • Civil Engineers working in water resources, hydro projects, and infrastructure resilience

    • Researchers and Academics in structural dynamics and fluid-structure interaction

    • FEA Analysts and Simulation Professionals seeking to expand their expertise in FSI modeling

    • Engineering Consultants, Risk Assessment Engineers and Dam Safety Authorities aiming for advanced seismic evaluation methods
       

    Why Should Join

    • Understand advanced FSI techniques over conventional Westergaard or Zanger methods

    • Learn how to model sloshing fluid behavior and its impact on dam stability during earthquakes

    • Discover the capabilities of FEA NX in handling complex dam-reservoir interaction problems

    • Stay ahead with cutting-edge simulation practices relevant to modern dam safety evaluations

    • Gain practical insights and modeling tips directly applicable to real-world projects

     

    Related MIDAS Software

    Speaker

    Harsha Tadavarthi Geotechnical Team Leader & Technical Manager MIDAS IT Australia
    Harsha Tadavarthi is the Technical Manager for the Oceania region at MIDAS IT, with over 8 years of experience in geotechnical engineering. He specializes in advanced numerical modeling and provides expert support for geotechnical and structural analysis across dams, hydropower, underground, mining, and other critical infrastructure projects. Harsha's expertise also includes thermal and seismic simulation of dams, as well as the design and analysis of complex geotechnical systems. He leads the seamless delivery of solutions in dam engineering, ensuring industry-leading support and innovation in geotechnical modeling. Through consultancy, training, and international workshops, he empowers professionals with both practical insights and theoretical foundations in geotechnical and structural modeling, fostering excellence across the engineering community.
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    FAQs

    Tech Q1. What is the difference between GTS NX and FEA NX? Expand or Collapse
    A. Both GTS NX and FEA NX are Finite Element Analysis (FEA) software from MIDAS.
    • FEA NX: Primarily designed for Dams, Hydropower, and Structural engineering applications.
    • GTS NX: Focused on Geotechnical engineering applications such as soil and rock behavior analysis.
    Tech Q2. How can I calculate the Factor of Safety (FoS) for sliding if I have stresses instead of forces? Expand or Collapse
    A. The interface elements provide the stresses (Normal & Tangential Stress) in the output. These stresses are then multiplied by the interface dimensions (Area) to find the forces. Then we can add up all the forces and use it in calculating the sliding safety factor.
    Tech Q3. How can I deconvolute the surface time history in FEA NX? Expand or Collapse
    A. FEA NX includes a tool called Free-Field Analysis, which performs ground response analysis and assists with deconvolution of surface time histories.
    Tech Q4. Regarding K₀ primary stress conditions: Is assuming elastic conditions (Poisson) with KH ​=ν/(1−ν) appropriate for rock mechanics? Expand or Collapse
    A. In FEA NX, you have three options to define initial stresses for rock and soil:
    1. K₀ condition
    2. Gravity condition
    3. In-situ stress condition
    The choice depends on your available investigation data or national codes/guidelines. In demonstration models, the gravity condition is often used for simplicity, but for precise engineering, select the method that matches your field data.
    Tech Q5. Does FEA NX account for concrete strength changes over time, and how are creep effects handled? Expand or Collapse
    A. FEA NX supports time-dependent material behavior, allowing you to model:
    • Age-dependent concrete strength (e.g., increase over 28 days or beyond).
    • Creep effects, by inputting appropriate creep formulations.
    The software performs time-dependent analysis, reflecting how concrete properties evolve over time, which is essential for long-term structural performance assessment.
    Tech Q6. Time Step Selection in Time-History Analysis: How should I select the time step for accurate results? Expand or Collapse
    A. Choosing the appropriate time step depends on the type of analysis:
    - Impact loading: Mesh size is critical to capture high-frequency motion accurately.
    - Earthquake analysis (implicit integration): Pay attention to numerical damping, especially when using the Newmark algorithm.

    By default, FEA NX uses the HHT-Alpha method, but you can switch to the Newmark algorithm if needed.
    General Q1. Is this training program free of charge? Expand or Collapse
    A. Yes! The Global Geotechnical Webinar Series 2025 is completely free of charge. Once registered, you’ll get access to all live and on-demand sessions, expert talks, hands-on tasks, and learning materials — at no cost.
    General Q2. How do I get the training license? Expand or Collapse
    A. Trial licenses for GTS NX and FEA NX are provided only to registered participants. You can find free trial information in the register confirmation email. If you can't find in your inbox, please contact us via the below link :
    🔗 Click
    General Q3. Where can I get the assignment files and how should I submit them? Expand or Collapse
    A. You can download the assignment files from the button at the top of the page labeled [Assignment (Model & Tutorial)], and they will also be sent via email after the webinar ends.Once completed, please submit your assignments.
    General Q4. How can I ask a question to MIDAS experts? Expand or Collapse
    A. Please submit your question using the form below. One of our technical experts/regional manager will get back to you shortly.
    🔗 Submit Your Inquiry(Assignment/Technical)
    🔗 Submit Your Inquiry (Product/Purchase)
    General Q5. How can I receive the certificate of completion? Expand or Collapse
    A. To be eligible for the certificate, please make sure to:
    ✅ Attend at least 2 live sessions
    ✅ Submit 2 or more assignments by October 8
    Certificates will be emailed to qualified participants on October 15, 2025.