The aim of this Bachelor’s thesis was to create a fully-functional parametric algorithm which automatically generates the model of a cross-arm structures for overhead transmission line (OHTL) lattice towers in Tekla Structures. The purpose of the thesis was to allow engineers to prevent any errors at the modelling stage.

To build the parametric model Grasshopper by Rhino 6 was used. To prove the performance of the parametric algorithm, five tests were provided in Appendix 3. Each test has its own set of input parameters in order to enfold a majority of variations. The principle of verification is based on the creation of drawings along different views for each plane of the structure.

As a result, the algorithm for cross-arm geometry including bolts and cuts was created. It was concluded that no direct modelling is needed for the cross-arm structures except connecting plates that are located between cross-arm and tower mainframe. Thus, the algorithm reduces the amount of time spent on the modelling phase and ensures error-free design.