GBTUL (acronym for "GBT at the University of Lisbon" and pronounced "G-B-Tool") is a program that performs elastic buckling (bifurcation) and vibration analyses of prismatic thin-walled members. The program enables viewing the GBT cross-section deformation modes and their participation in the solution of the problem being solved, allowing for an in-depth insight into the underlying mechanics. The user-friendly and intuitive GUI provides high-quality 2D and 3D outputs.

This program was developed with the financial support of “Fundação para a Ciência e Tecnologia” (FCT-MCTES Portugal), through the research project PTDC/ECM/108146/2008 “Generalised Beam Theory (GBT) - Development, Application and Dissemination".

When using GBTUL please cite:

Bebiano R., Camotim D., Gonçalves R., "GBTUL 2.0 − A second-generation code for the GBT-based buckling and vibration analysis of thin-walled members", Thin-Walled Structures, 124, pp. 235 - 257, 2018.

Download and unzip the GBTUL installer.

A brief tutorial is available here. 

Known issues:

The transverse extension modes should not be included when running the Analytical Solution.