Torsion in Spot-Welded Thin-Walled Box with Varying Section
Pei Xingzhu(1),Ren Zhengquan(2),Zhang Li(1)
(1 School of Civil Engineering and Mechanics, Xi'an Jiaotong University, Xi'an 710049, China)
(2 College of Science and Engineering, Yanbian University, Yanji 133002,China)

Abstract: A method to analyze torsion performances in a spot-welded thin-walled box is proposed, where the cross-section varies slowly along the longitud inal direction. Warping torsions for two situations, even and uneven pitch of spot-welds, are discussed. It is concluded that torsion rigidity is weakened as the beam length increases, whose decreasing rate is nearly equal to one of uni form section; the beam with varying section keeps a certain rigidity with fewer welding spots and lower cost. If the welded spot pitch p₂, in the right, varies within 25% of the pitch p₁ in the left, the shearing force transmi ssion nearly unvaries. The simulation results coincide the experimental ones very well.
Keywords: varying section, spot-welded thin-walled box secti on beam, warping torsion, welded spot pitch.