StructuralSurfaceMember

2D member (Plate, Wall…)

Instances of StructuralSurfaceMember describe face members, structural analysis idealizations of slabs, walls, shells. Surface members may be planar or curved with an arbitrary number of edges.

The geometry of a 2D member is defined by nodes (StructuralPointConnection)and edges. The edges define shape of the curve between two next nodes.

Specification in the excel

Name of the column header

Type of data

Value example or enum definition

Required value

Description

Name

String

B1

yes

Human readable unique name of the 2D member

Type

String

Plate

no

The type of the 2D member, used within the model E.g. Plate, Wall, Shell. The type reflects the geometry or classification in the structure. Plate and Wall are expected to be planar (flat) geometry objects. Shell is expected to be non planar object. The type DOES NOT describes available internal forces for 2D finite element.

Material

String

MAT_1

yes

The name reference to the existing, valid name of the StructuralMaterial object.

Thickness type

Enum

Constant

Variable in global X

Variable in global Y

Variable in global Z

Variable in local X

Variable in local Y

Variable in direction XY

Variable radially

yes

Thickness of the slab can be defined as a constant - one thickness for whole 2D member or variable. Variability of the thickness can be defined in the global coordinate system (GCS) or in the local coordinate system (LCS) of the 2D member. For LCS are two more options: - Variable in two directions X and Y (three points have to be defined in thickness attribute ) - Variable radially, for circle slabs. Two points have to be defined, centre point and the point on the diameter.

Thickness [mm]

String

200 N1:200; N2:250

yes

The thickness of the structural surface member - For constant thickness: One number in millimetres (e.g. 200) - For variable thickness - type "Global X, Global Y, Global Z, Local X, Local Y and Radial: Two thicknesses in the following format N1:200; N2:250 . N1 means name of the existing StructuralPointConnection of the StructuralSurfaceMember and number is a thickness in this point. - For variable thickness type Direction XYThree thicknesses N1:200; N2:250; N3:280 have to be specified

System plane at

Enum

Bottom

Centre

Top

yes

Defines the position of the system plane.

Nodes

String

N81; N263; N659; N660

yes

All nodes that belongs to surface member and defines its geometric shape. The names of the nodes are separated by ; (semicolon) and space.

Internal nodes

String

N22; N23

no

Internal nodes belonging to StructuralSurfaceMember defined in StructuralPointConnection Internal nodes are not geometry defining The names of the nodes are separated by ; (semicolon) and space

Edges

String

Line; Line; Circular Arc; Line

or

Line;Spline-5;Line;Parabolic Arc;Line

yes

Defines the shape of the curve between two next nodes (or more nodes depends on edge type). Supported strings are:

Line

Circular Arc

Circle by 3 points

Circle and Point

Parabolic arc

Bezier Spline-x

Where "x" number of nodes defining the spline

The names are separated by ; (semicolon) and space.

It is possible to also define circle geometry by using "Circle and Point" or "Circle by 3 points". In case of "Circle and point" two nodes have to be defined, centre of the circle and a point on a circle. The circle defined by two points is always horizontal.

Area [m2]

Double

2.359

no

The value of the surface area of the StructuralSurfaceMember

Layer

String

1st floor

no

Custom created layer. The layer can thus comprise entities that have something in common (e.g. one floor, columns of one floor, columns of the same length, etc.)

LCS Type

Enum

x by vector

y by vector

Tilt of vector defined by point

yes

Defines type of the local coordinate system of the StructuralSurfaceMember. Option “Tilt of vector defined by point” allows change of orientation of the LCS to one point (for all mesh elements). For this, you have to specify coordinates of the vector. For further understanding see Introduction

Coordinate X [m]

Double

1

yes

Coordinate of the vector of the LCS in X direction

Coordinate Y [m]

Double

0

yes

Coordinate of the vector of the LCS in Y direction

Coordinate Z [m]

Double

1,2

yes

Coordinate of the vector of the LCS in Z direction

LCS Rotation [deg]

Double

45.00

yes

This value defines the rotation of local axes of the 2D member

Structural Z Eccentricity [mm]

Double

-125

no

Define the position difference between a physical element and its analytical member representation in Z direction (vertical movement of the center plane). Used to build up physical (structural body from analysis member). DO NOT affects internal forces.

Analysis Z Eccentricity [mm]

Double

-125

yes

Define the position difference between a physical element and its analytical member representation in Z direction (vertical movement of the center plane). Used to build up physical (structural body from analysis member). DO affects internal forces.

Shape

Enum

Flat

Curved

no

Specify the shape of the StructuralSurfaceMember in the sense of the planarity of the system plane. For Flat, all nodes have to be in the same plane.

Behavior in analysis

Enum

Isotropic

Orthotropic

Membrane

Press only

yes

Isotropic: A normal isotropic slab with identical properties in all directions is used. Orthotropic: An orthotropic slab with different properties in two orthogonal directions is used Membrane: Special membrane elements are used for the analysis of the slab (only normal forces allowed) Press only: Special elements capable of resisting only compression stress are used for the analysis of the slab (no tension allowed)

Color

String

#7FFFFF00

no

Defines the colour and transparency of the object. Colour is defined by Hex format #AARRGGBB. Transparency is controlled by the alpha channel AA.

Parent ID

String

67b35d84-3d04-47aa-aa4a-dc1263982320

no

Is filled for objects created be dividing curved geometry to series of straight line objects. Parent ID will ensure that curved edge is imported as straight parts to nonsupporting application, and back to original supporting application as curved geometry. To ensure successful round trip of segmented objects and their related objects, Parent ID needs to be present in both directions.

Id

String

39f238a5-01d0-45cf-a2eb-958170fd4f39

no

Unique attribute designation

Notes

Rotation of LCS is measured from origin position of local x and y-axis and orientation follows positive rotation according to right-handed rule.

An example of a definition of a curved wall defined in the StructuralSurfaceMember sheet can be seen below, nodes N1, N2, N3 define the first arc and N4, N5, N6 define the second arc. Edges shown below are important for RelConnectsRigidMember: