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    Structure

    How to Perform Time-History Analysis?

    BLOG NEWS & TRENDS

    Introduction of Functions for Time-History Analysis in midas Gen

     

    Process in midas Gen

     

     

    time history analysis Process in midas Gen

    time-history analysis

    Time history analysis has a procedure similar to Pushover analysis.  After running the analysis, the member force, hinge status, and story drift results should be checked.

     
     
     
     
     
    TABLE OF CONTENTS
     
     
     
     
     
     
     
     
     
     
     
     
     
     

     

     

    Member Type for Time History & Definition of Hinge


     

     

    3For member type, unlike pushover analysis, the point spring and masonry are not provided.

     

     

     

    Hinge Models

     

    4

     

    - Kinematic Hardening Hysteresis Model

     

    Kinematic Hardening hysteresis model

    - Origin-Oriented Type Hysteresis Model

     

    Origin-oriented type hysteresis model

    - Clough Type Hysteresis Model

     

    Clough type hysteresis model

    - Takeda Type Hysteresis Model

     

    Takeda type hysteresis model

    - Normal Bilinear Type Hysteresis Model

     

    Normal Bilinear Type hysteresis model

     

    - Slip Bilinear Type hysteresis model

     

    Slip Bilinear Type hysteresis model

     

     

     

     

     

    Hinge Model – Fiber Model


    A structural model that includes nonlinearity in a distributed fashion, using finite fiber elements, is able to characterize in higher detail the reinforced concrete elements and is thought to capture more accurately response effects on such elements.

     

    hinge model-fiber model- Section Division for Fiber Model Definition

    It supports generating a Mesh shape and arranging rebar automatically.

    fiber division of section dialog box- Inelastic Material Properties (Stress-Strain Curve)

     

    Concrete > Kent & Park Model

     

    Inelastic Material PropertiesRebar > Menegotto-Pinto Model

     

    Inelastic Material Properties

    - Fiber Cell Result Plotting

     

    analysis result of fiber section dialog box

     

     

     

     

    Define Time-History Load


    In order to define Time History Load, the Analysis Method, Initial Load Consideration, and Damping Method should be selected as shown below.

     

     

    define time history load

     

     

     

     

     

    Result of Time-History Loads


    It provides Hinge Status, Member Force/Deformation, and Energy Graph.

     

    - Hinge Status

    hinge status

    - Member Force/Deformation

     

    Member Force andDeformation

    - Energy Result

     

    Energy Result

     

     

     

     

     

    Analysis Results (Graph & Text Output)


    Gen supports to check the results of deformation, velocity, and acceleration by time at specific node or hinges in graph and text report.

     

    - Result Curve : Force-Deformation Curve for Each Members

     

    Result Curve

     

    - Result Curve: Time(sec)-Deformation Curve

     

    Result Curve

     

     

     

     

     

    Load Combinations for Time-History


    Gen is supporting to convenient function for checking the results of member force and deformation.
    Maximum and average values for multiple selected ground waves are provided in the result table.

     

    create load combinations dialog box

    - Beam force table for Max. result

     

    13- Beam force table for an average result

     

    14

     

    Consider Time History results in the design by inputting the load combinations.

     

    load combinations dialog box

     

     

     

     

     

    Analysis Time


    As test result, In the case of the model with 4000-analsys steps, about 5000 elements and 4000 hinges, it took about 7 minutes. And, in the case of the model with 3000 analysis steps, about 1500 elements and 6000 hinges, it took about 5 minutes. Recently, the analysis speed has been improved by 2 times.

     

    analysis time

     

     

    Download the full content of  "Fundamentals of Time-History Analysis" after finishing the form below.😀

     

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    Young-il Seo
    Young-il Seo | Principal Structural Engineer

    Young-il has over 13+ years of experience in building design, especially high-rise buildings with column reduction analysis, plant structures, pushover analysis, health monitoring, and vibration control projects. Since 2016, he is planning and providing technical supports for midas building products such as midas Gen, nGen, and Design+.

    E-BOOK Fundamentals of
    Time-History Analysis

    This material provides basic concepts of time-history analysis by performing
    in midas Gen. It is helpful to analyze regarding simple building, machine vibration,
    floor vibration, and seismic control devices.

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