两端弹性约束时点焊箱型薄壁构件的翘曲扭转特性研究  

Research on Warping and Torsion of Spot-welded Thin-walled Beams with Elastic Constraints from Both Ends

作　　者：张立[1] 裴星洙[1] 

机构地区：[1]西安交通大学土木工程系,西安710049

出　　处：《机械科学与技术》2006年第6期635-640,共6页Mechanical Science and Technology for Aerospace Engineering

摘　　要：主要研究了在两端受到弹性约束时,点焊双帽箱型横截面薄壁构件的扭转特性,并得到一些有用的结论:当对杆端的翘曲进行约束时,剪力主要会通过构件中部的焊点来承受;扭转刚度比会随着焊点间距的增加而增加;扭转刚度与截面形状(有焊点边长与无焊点边长的尺寸比b/a)有关,具有焊点的边长大于没有焊点的边长的构件时,其扭转刚度较大。另外,刚度比与弹性翘曲约束系数具有一定的关系,弹性约束系数越大,其刚度比也越大。在对实际点焊薄壁结构进行设计时,圣维南扭转刚度和翘曲扭转刚度是点焊薄壁构件的两个重要指标,对它的研究会对此类构件的设计和利用打下理论基础。The paper studied the torsion of double-hat spot-welded thin-walled box beam with elastic constraints from both ends and reached the following conclusions： the shear force of beams is applied mainly to welded spots in the middle of the beams with warping constraints coming from both ends. The torsion rigidity increases with the increase of spot pitches and is relative to the shape of beam sections （ b/a, ratio of side length with and without welded spots）. For the beam sections with welded spots whose side length is bigger than those without welded spots, their torsion rigidity is also bigger. Moreover, there is certain relationship between torsion rigidity ratio and elastic warping constraint ratio. The bigger the elastic constraifit ratio, the bigger the rigidity ratio is. The Saint Venant＇s torsion rigidity and warping rigidity are two important indices in the design of spot-welded thin-walled structures.

关 键 词：薄壁构件 扭转刚度 弹性约束 点焊 翘曲 

分 类 号：TG407[金属学及工艺—焊接] U463.326[机械工程—车辆工程]