Sections for BarElement

Example 1

Consider example below, a cantilever beam with fixes start node and free end node, under defined loads.

image todo

The section is I section with :

  • Width of w = 10 cm and

  • Height of h = 15 cm

  • Flange thickness of tf = 5 mm

  • Web thickness of tw = 5 mm

  • Material is steel with elastic module of E = 210 GPa and Poisson’s ratio of nu = 0.3.

For defining the element itself we should do:

TODO

Till here the section for element is not defined. We can define the section in two ways:

  • UniformParametric1DSection

  • UniformGeometric1DSection

** UniformParametric1DSection: ** If we want to define section with UniformParametric1DSection, as defined in section Cross Section, the parametric means that properties are parametrically defined one by one. for this example assuming we know that:

  • Area of section is A = 0 mm^2

  • Second area moment around y axis is Iy = 0 mm^4

  • Second area moment around z axis is Iz = 0 mm^4

  • Torsion constant is J = 0 mm^4

var section = new UniformParametric1DSection();
section.A = 1e-4;
section.Iy = section.Iz = 1e-6;
section.J = 2e-6;

var bar = new BarElement();
bar.CrossSection = section;

** UniformGeometric1DSection: ** If we want to define section with UniformGeometric1DSection, as defined in section Cross Section, the geometric means that properties are parametrically defined one by one. For this example there is no need to know the properties of section, BFE will calculate them. We just need to define the section geometry:

var section = SectionHelper.GenerateISection(0,0,0,0,0,0,0,00,0,0,0,0,);
bar.CrossSection = section;