Beam bracing is applied to prevent the relative displacement of the top and bottom flanges or to effectively control the twisting of the section, and the lateral stability of the beams are provided by lateral bracing, torsional bracing or a combination of both. Modular steel I-girders are laterally interconnected by torsional bracings that are installed to increase the resistance to lateral torsional buckling. In this paper, numerical parametric study was carried out by varying the crossbeam web height to examine the effects of the web torsional stiffness. Three-dimensional finite-element analysis using the commercial finite element software ABAQUS was obtained for the parametric numerical analyses of a series of feasible two-girder models, and the failure mode, lateral-torsional buckling strength and the moment-displacement behavior of the main girders was determined.

ABSTRACT
 1. Introduction
 2. Numerical Analysis
 3. Analysis Results
 4. Conclusion
 References

• 최병호(한밭대학교 건설환경공학과) | Choi Byung-Ho
• Arriane Nicole Andico(한밭대학교 건설환경공학과)
• 곽재영(한밭대학교 건설환경공학과) | Kwak Jae-Young
• 박찬희(포스코 구조연구그룹) | Park Chan-Hee