# midas Structure

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OVERVIEW

2D Member Type

nGen supports various 2D member types.

So, what is the difference of 2D elements?

*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)

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.

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.

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+.

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