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    Structure

    2D Member Design & Analysis

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    OVERVIEW

     

    2D Member Type

    nGen supports various 2D member types.

    So, what is the difference of 2D elements?

     

    2D Member Type*All of these are Plate Elements, only categorized by design type.

     

    1. Categorized Characteristics of Each Model    

    MODEL 1: WALL (Membrance)

    1. No meshed element

    2. No out-of-plane stiffness

    3. Only in-plane stiffness

       

    MODEL 2: WALL (PLATE, NOT MESHED)

    1. No meshed element

    2. In-plane and out-of-plane stiffness

     

    MODEL 3: WALL (PLATE, MESHED)

    1. Meshed elements in Analysis

    2. Identical to plate element

    3. Design as wall member

     

    MODEL 4: WALL (WALL COLUMN)

    1. Identical to MODEL 3

    2. Design as Column or Beam member

     

    MODEL 5: PLATE

     

    MODEL 6: SLAB (PLATE OUT&IN)

    1. Meshed elements in Analysis

    2. Identical to PLATE element

    3. Design as SLAB member

     

    MODEL 7: SHELL

     

         

     

    2. 2D Member Type: Analysis Result (Deformations)

    2d member type_analysis results

     

    1. Model 2 is not meshed. Therefore, it has different results from others.

    2. Model 3~5, and 7 have the same results because all of them is plate element.

    But, only MODEL 6 (Slab) has the different result because "DRILLING DOF" OPTION IS CONSIDERED.

    * If checking off this option, MODEL 6 (Slab) will have the same result as other models.

     2d member typeAnalysis settings-1

    3. Since MODEL 1 has no out-of-plane stiffness, infinite deformation can occur. So, it is excluded from the comparison.

     

     

     

    3. 2D Member Type: Summary

     

     

    Model 1

    Wall (Membrane)

    Model 2

    Wall (Not meshed)

    Model 3

    Wall (Meshed)

    Model 4

    Wall Column

    Model 5

    Plate

    Model 6

    Slab

    Model 7

    Shell

    Member Type Wall Wall

    Wall

    / Basement Wall

    Wall Column

    / Plate Beam

    Plate

    Slab

    / Flat Slab

    /Footing

    Shell
    Design Type Wall Wall

    Wall

    / Basement Wall

    Column (Axial +Flesural) Plate (Axial + Flexural) Slab (Flesural of Out-of-Plane) Not Designed
    Mehsed Shape x x o o o o o
    Out of Plane Stiffness x o o o o o o
    In Plane Stiffness o o o o o o o
    Drilling DOF x x x x x o x

     

     

     

    4. Drilling Degrees of Freedom 

    Degree of freedom for the torsion of in-plane.

     

    2d member type_drilling degree

     

          

     

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    Young-il Seo
    Yeong-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 Eurocode2 Design Guide

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