点焊箱型截面薄壁构件的翘曲扭转研究-工程力学.PDFVIP

第23 卷第3 期 Vol.23 No.3 工 程 力 学 2006 年 3 月 March 2006 ENGINEERING MECHANICS 56 文章编号：1000-4750(2006)03-0056-07 点焊箱型截面薄壁构件的翘曲扭转研究 *裴星洙，张 立 (西安交通大学建筑工程与力学学院，西安710049) 摘 要：构成汽车车身结构的点焊薄壁构件，可以看成是开口截面段和闭口截面段相互穿插组合而成的半闭口截 面构件。针对这种构件，基于瓦格纳的翘曲扭转理论，并考虑到点焊薄壁构件焊点处的弹性特性，用一条完整的 具有剪切变形特性的“剪切弹簧”来取代构件上的点焊带。通过对这种具有“假想弹簧”的半闭口截面构件的研 究，提出了一种分析点焊箱型截面薄壁构件的翘曲扭转的新方法。通过理论值与实验值之间的比较，验证了该方 法的精度及合理性，并阐明了扭转刚度对点焊薄壁梁翘曲的影响。此研究同时为今后研究解决实际车体结构的多 种约束翘曲问题，打下了良好的理论基础。 关键词：汽车工程；翘曲扭转；薄壁构件；箱型截面梁；点焊 中图分类号：TG407; TU33+8 文献标识码：A RESEARCH ON WARPING TORSION OF SPOT-WELDED THIN-WALLED BOX SECTION BEAM * PEI Xing-zhu , ZHANG Li (School of Civil Engineering and Mechanics, Xi’an Jiaotong University, Xi’an 710049, China) Abstract: The spot-welded thin-walled beam, a component of automobile body structure, can be supposed as a half-closed-section beam composed of interval series (closed-section parts and opened-section parts). It is proposed to apply general theory of torsion based on the warping torsion theory (solution of H. Wagner) to this kind of thin-walled box beams with spot-welded joints. Considering the elastic character of weld spots on the thin-walled spot-welded beam, a continuous shear-spring with character of shearing deformation is used for replacing the weld spots on the beam. After a study on this hypothesized spring beam, a method for analyzing warping torsion on spot-welded thin-walled box section beam has been presented. The accuracy and rationality of the method are proved by comparing theoretical analysis and experimental testing results. This method can be