Lateral Torsional Buckling Investigation on Welded Q460GJ Structural Steel Unrestrained Beams under a Point Load
This study aims to investigate the lateral torsional buckling of I-shaped cross-section beams fabricated from Q460GJ structural steel plates. Both experimental and numerical simulation results are presented in this paper. A total of eight specimens were tested under a three-point bending, and the corresponding numerical models were established to conduct parametric studies. The effects of some key parameters such as the non-dimensional member slenderness and the height-to-width ratio, were investigated based on the verified numerical models. Also, the results obtained from the parametric studies were compared with the predictions calculated by different design codes including the Chinese design code (GB50017-2003, 2003), the new draft version of Chinese design code (GB50017-201X, 2012), Eurocode 3 (EC3, 2005) and the North America design code (ANSI/AISC360-10, 2010). These comparisons indicated that the sectional height-to-width ratio does not play an important role to influence the overall stability load-carrying capacity of Q460GJ structural steel beams with welded I-shaped cross-sections. It was also found that the design methods in GB50017-2003 and ANSI/AISC360-10 overestimate the overall stability and load-carrying capacity of Q460GJ welded I-shaped cross-section beams.
 Shi G., Ban H., Shi Y.-J. and Wang Y.-Q. “Overview of research progress for high strength steel structures.” Engineering mechanics, Vol. 30(1), pp. 1-13, 2013.
 Ban H., Shi G., Bai Y., Shi Y. and Wang Y. “Residual Stress of 460 MPa High Strength Steel Welded I Section: Experimental Investigation and Modeling.” International Journal of Steel Structures, Vol. 13(4), pp. 691-705, 2013.
 Kubo M. and Y. Fukumoto “Lateral-torsional buckling of thin-walled I-beams.” Journal of Structural Engineer-ASCE, Vol. 114(4), pp. 841-855, 1988.
 Gao L., Sun H., Jin F. and Fan H. “Load-carrying capacity of high-strength steel box-sections I: Stub columns.” Journal of Constructional Steel Research, Vol. 65(4), pp. 918-924, 2009.
 Ban H., Shi G., Shi Y. and Wang Y. “Overall buckling behavior of 460 MPa high strength steel columns: Experimental investigation and design method”. Journal of Constructional Steel Research, Vol. 74, pp. 140-150, 2012.
 Liu Y. and L. Gannon “Experimental behavior and strength of steel beams strengthened while under load.” Journal of Constructional Steel Research, Vol. 65(6), pp. 1346-1354, 2009.
 Gelera K. M. and J. S. Park “Elastic lateral torsional buckling strength of mono-symmetric stepped I-beams.” Ksce Journal of Civil Engineering, Vol. 16(5), pp. 785-793, 2012.
 Wang Y.-B., Li G.-Q. and Chen S.-W. “The assessment of residual stresses in welded high strength steel box sections.” Journal of Constructional Steel Research, Vol. 76, pp. 93-99, 2012.
 Wang Y.-B., Li G.-Q., Chen S.-W. and Sun F.-F. “Experimental and numerical study on the behavior of axially compressed high strength steel columns with H-section.” Engineering Structures, Vol. 43, pp. 149-159, 2012.
 Wang Y.-B., Li G.-Q., Chen S.-W. and Sun F.-F. “Experimental and numerical study on the behavior of axially compressed high strength steel box-columns.” Engineering Structures, Vol. 58(1), pp. 79-91, 2014.
 Yang B., Xiong G., Ding K., Nie S.-D., Zhang W.-F., Hu Y. and Dai G.-X. “Experimental and Numerical Studies on Lateral-Torsional Buckling of GJ Structural Steel Beams under a Concentrated Loading Condition.” International Journal of Structural Stability and Dynamics, Vol. 16(01): 1640004, 2016.
 Yang B., Nie S.-D., Xiong G., Hu Y., Bai J.-B., Zhang W.-F. and Dai G.-X. “Residual stresses in welded I-shaped sections fabricated from Q460GJ structural steel plates.” Journal of Constructional Steel Research, Vol. 122, pp. 261-273, 2016.
 Xiong G., Kang S.-B., Yang B., Wang S.-B., Bai J.-B, Nie S.-D., Hu Y. and Dai G.-X. “Experimental and numerical studies on lateral torsional buckling of welded Q460GJ structural steel beams.” Engineering Structures, Vol. 126, pp.1-14, 2016.
 GB 50017-2003. Code for design of steel structures. Beijing, China, Planning Press, 2003 (in Chinese).
 ANSI/AISC360-10 Specification for structural steel buildings: ANSI/AISC360-10. Chicago, AISC., 2010.
 GB 50017-201X. Code for design of steel structures (draft version). Chinese national standard management group. (in Chinese), 2012.
 EC3 European committee for standardization. Eurocode 3: Design of steel structures—Part 1-1: General rules and rules for buildings. UK, British Standards Institution. BS EN 1993-1-1: 2005.
 GB/T228.1-2010 Metallic Materials-Tensile Testing-Pare 1: Method of test at room temperature. (in Chinese), 2010.
 ABAQUS Standard user's manual Hibbitt, Karsson and Sorensen, Inc., 2014.