Experimental and Numerical Studies on Lateral-Torsional Buckling of GJ Structural Steel Beams Under a Concentrated Loading Condition

GJ structural steel has been applied in many high-rise buildings and large-span structures, such as New CCTV Building and Beijing Olympic Stadium (Birds Nest). However, the design methods of GJ structural steel members are not covered by the current design codes. This paper describes the lateral-torsional buckling behavior of welded sections based on a series of flexural tests performed on H-sections fabricated from GJ structural steel plates. Six steel beams were tested under a concentrated loading condition. It was observed from the experimental tests that lateral-torsional buckling controlled the final failure modes. Numerical simulations of the experimental tests were conducted as well. The numerical simulation results agreed well with the test data. Parametric study was conducted after the validation of the numerical model. Finally, both the experimental test and parametric study results were compared with multiple design codes, including Chinese steel structure design codes (GB50017-2003, GB50017-201X), Eurocode (EC3) and American code (ANSI/AISC360-10). The comparisons indicate that GB50017-201X can predict appropriate flexural strengths of GJ structural steel beams. Also, it is found that the predictions of EC3 are too conservative, while for certain cases ANSI/AISC360-10 predictions are too high for the design flexural strength of GJ structural steel beams.

[1]  H. H. Snijder,et al.  Experimental investigation on residual stresses in heavy wide flange QST steel sections , 2013 .

[2]  Yuanqing Wang,et al.  Residual stress of 460 MPa high strength steel welded i section: Experimental investigation and modeling , 2013, International Journal of Steel Structures.

[3]  Yoshito Itoh,et al.  Strength Variation of Laterally Unsupported Beams , 1980 .

[4]  Guo-Qiang Li,et al.  The assessment of residual stresses in welded high strength steel box sections , 2012 .

[5]  Guo-Qiang Li,et al.  Experimental and numerical study on the behavior of axially compressed high strength steel columns with H-section , 2012 .

[6]  B. Young,et al.  Experimental Investigation of Cold-Formed High-Strength Stainless Steel Tubular Members Subjected to Combined Bending and Web Crippling , 2007 .

[7]  Yuhshi Fukumoto,et al.  LATERAL-TORSIONAL BUCKLING OF THIN-WALLED I-BEAMS , 1988 .

[8]  Yuanqing Wang,et al.  Overall buckling behavior of 460 MPa high strength steel columns: Experimental investigation and design method , 2012 .

[9]  Carlos Rebelo,et al.  Statistical evaluation of the lateral-torsional buckling resistance of steel I-beams, Part 1: Variability of the Eurocode 3 resistance model , 2009 .

[10]  Guo-Qiang Li,et al.  Experimental and numerical study on the behavior of axially compressed high strength steel box-columns , 2014 .

[11]  Liam Gannon,et al.  Experimental behavior and strength of steel beams strengthened while under load , 2009 .

[12]  Ben Young,et al.  Experimental and numerical investigation of cold-formed lean duplex stainless steel flexural members , 2013 .

[13]  Guo-Qiang Li,et al.  Residual stresses in welded flame-cut high strength steel H-sections , 2012 .

[14]  Yuanqing Wang,et al.  Residual stress of 460 MPa high strength steel welded i section: Experimental investigation and modeling , 2013 .