Example 4: Spring supports demonstration using 3D Frame Analysis Library

Example 4: Spring supports demonstration using 3D Frame Analysis Library

In this example, we will call the 3D Frame Library from a Visual Studio project and carry out the structural analysis of a simple beam under different load cases and one load combination. We will first provide the geometry, material properties and loads and afterwards call the corresponding routine in order to obtain the results regarding the load cases and load combination.

spring supports using 3D Frame Analysis Library for structural analysis

Sample beam with supported by springs on its first node to analyze with 3D Frame Library (Metric units)

We will first create a new C# Windows Application project from Visual Studio and follow the following steps to carry out the structural analysis according the data provided. Please notice that we could use any other .NET compatible language and take the corresponding steps. The source code of all examples can be downloaded here.

Add a reference to 3D Frame Library

A reference to Frame 3D Library can easily be added by right clicking on the application project and selecting Add --> Reference.

Providing the data to 3D Frame Library using C#

New model definition

Model Model = new Model();
Model.LicenseInfo = LicenseInfo;

Definition of materials

//Create a new material for concrete
Material matConcrete = new Material();
matConcrete.Name = "Concrete";//Material name
matConcrete.Density = 2.5;//density in mass units/m3, for example tn/m3
matConcrete.G = 11538461;//shear modulus
matConcrete.E = 30000000;//elasticity modulus

Definition of cross section

//Create a new beam section of dimensions 40cmx80xm
FrameElementSection secBeam40_80 = new FrameElementSection();
secBeam40_80.Name = "Beam40/80";//section name
secBeam40_80.A = 0.4 * 0.8;//section area
secBeam40_80.Iy = 0.4 * 0.8 * 0.8 * 0.8 / 12;//inertia moment about local y axis
secBeam40_80.Iz = 0.8 * 0.4 * 0.4 * 0.4 / 12;//inertia moment about local z axis
secBeam40_80.It = 0.0117248;//torsional constant
secBeam40_80.b = 0.40;//section width
secBeam40_80.h = 0.80;//section height

Definition of model geometry and loads

//Create node n1            
Frame3D.SuperNode n1 = new Frame3D.SuperNode(1, 0, 0, 0);
n1.dof3constraint = true;//translational constraint in direction z at local system of node
n1.dof4constraint = true;//rotational constraint in direction x at local system of node
n1.dof5constraint = true;//rotational constraint in direction y at local system of node
n1.Kdof2 = 5000;//Translational spring constant of partial support at y direction of local node system (units: force/length, for example kN/m)
n1.Kdof6 = 30000;//Rotational spring constant of partial support about z direction of local node system (units: moment/rotation, for example kNm/rad)
Model.InputNodes.Add(n1);

//Create node n2            
Frame3D.SuperNode n2 = new Frame3D.SuperNode(2, 5, 0, 0);
n2.dof1constraint = true;//translational constraint in direction x at local system of node
n2.dof2constraint = true;//translational constraint in direction y at local system of node
n2.dof3constraint = true;//translational constraint in direction z at local system of node
n2.dof4constraint = true;//rotational constraint in direction x at local system of node
n2.dof5constraint = true;//rotational constraint in direction y at local system of node
n2.dof6constraint = true;//rotational constraint in direction z at local system of node
Model.InputNodes.Add(n2);

//Create frame element 1 
FrameSuperElement el1 = new FrameSuperElement(1, n1, n2, new Geometry.XYZ(0, 0, 1), matConcrete, secBeam40_80, new MemberReleases(), new MemberReleases(), false, false);

LinearLoadCaseForSuperFrameElement lc1 = new LinearLoadCaseForSuperFrameElement("lc1", LoadCaseType.DEAD);
lc1.UniformLoad.UniformLoadsY.Add(new FrameSuperUniformLoad(0, 1, -10, -10, LoadDefinitionFromStartingNode.Relatively, LoadCordinateSystem.Global));
el1.LinearLoadCasesList.Add(lc1);

Model.InputFiniteElements.Add(el1);

Call the solution method

Model.Solve();

Obtain the analysis results

double[] Min, Max;

//Spring reactions can be obtained from the corresponding Method, as follows
//Spring reactions, as node reactions, as reported in the node local system
n1.GetSpringReactionsForLoadCase("lc1", out Min, out Max, 0);
double n1_Rty_lc1 = Max[1];
n1.GetSpringReactionsForLoadCase("lc1", out Min, out Max, 0);
double n1_Rrz_lc1 = Max[5];
n2.GetReactionsForLoadCase("lc1", out Min, out Max, 0);
double n2_Rty_lc1 = Max[1];
n2.GetReactionsForLoadCase("lc1", out Min, out Max, 0);
double n2_Rzz_lc1 = Max[5];
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