### Calculates the deflections of a given model using second order theory for small deflections.

## Inputs

Name | ID | Description | Type |

**Model** | Model | Model for which to calculate deflections | Model |

**Load Case** | LC | Load-case from which to take the normal force which causes ThII effects. If -1 then the maximum compressive normal force of all load-cases is used. | Integer |

**RTolerance** | RTol | Upper limit for the iterative increment of displacements. | Number |

**Max Iterations** | MaxIter | Maximum number of equilibrium iterations. | Integer |

**No Tensional NII** | NoTenNII | If true NII is limited to compression (i.e. negative values). This means that no stiffening due to tension is considered. | Boolean |

## Outputs

Name | ID | Description | Type |

**Calculated model** | Model | Model with displacements calculated | Model |

**Maximum displacement [m]** | Disp | Maximum displacement [m] of each load-case of the model at end-points and mid-points of elements | Number |

**Resulting force of gravity [kN]** | G | Resulting force of gravity [kN] of each load-case of the model | Number |

**Elastic energy [kNm]** | Energy | Internal elastic energy [kNm] of each load-cases of the model | Number |