Lateral Torsional Buckling of I-beams A Parametric Study of Elastic Critical Moments in Structural Design Software Master of Science Thesis in the Master’s Programme Structural Engineering and Building Technology MARTIN AHNLÉN JONAS WESTLUND Department of Civil and Environmental Engineering Division of Structural Engineering Steel and Timber Structures CHALMERS UNIVERSITY OF TECHNOLOGY Göteborg, Sweden 2013 Master’s Thesis 2013:59