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Unsymmetrical sections are commonly used in thin-walled metal structures for the optimal utilization of materials and fast production. The members with these sections are usually slender and susceptible to lateral-torsional or flexural-torsional buckling, and furthermore, their structural behaviors are often complex because the shear center doesn't coincide with the centroid. Although conventional warping beam-column elements can simulate these buckling modes, they are derived based on thedoi:10.1037/a0016436 fatcat:bbpapb2tyjbhfbusefj42wx24a