摘要
高强钢因其可降低结构用钢量和资源消耗,在越来越多的工程中得到了应用,但有关高强钢构件稳定性的研究还比较缺乏,而残余应力又是影响构件稳定性的重要因素。BS700高强钢(名义屈服强度为700 MPa)由于没有型钢,采用先把钢板冷弯成槽形截面构件,然后对焊形成箱形截面构件,而焊接会使构件截面产生残余应力,目前还比较缺乏有关焊接残余应力对BS700槽形对焊箱形截面构件稳定性影响方面的研究。为此对这一问题借助试验和数值分析的方法展开了研究,以期了解残余应力对BS700槽形对焊箱形截面构件稳定性的影响。通过材料拉伸试验,得到了BS700高强钢材料的力学性能参数和构件开孔时的应力释放系数,运用盲孔法对BS700槽形对焊箱形截面构件中部截面的残余应力进行了测试,得到了其截面上相关点位的残余应力值,结合已有研究成果,提出了BS700槽形对焊箱形截面构件残余应力分布模式;借助有限元分析软件ANSYS利用其APDL可编程语言编写了可引入几何缺陷和残余应力的非线性屈曲分析模型,利用该模型对长细比分别为15、20、30、40、50、60、70、80、90、100,截面宽厚比分别为10、15、20、25、30、35、40、50共计68个构件区分有、无残余应力进行了非线性屈曲分析,研究了不同宽厚比和不同长细比条件下残余应力对BS700槽形对焊箱形截面构件稳定性的影响。通过研究发现,在焊缝处及箱形截面弯角处存在残余拉应力,其余各处为残余压应力。焊缝处最大残余拉应力数值约为屈服强度的0.76,腹板中部位置的最大残余压应力数值约为屈服强度的0.14。在已有研究的基础上提出了折线型的残余应力分布模式,与试验结果对比吻合较好;残余应力对不同宽厚比条件下的构件稳定系数均有影响,总体趋势是随着宽厚比的增加,残余应力的影响逐渐减小,主要原因是在大宽厚比
High-strength steel has been used in more and more projects because it can reduce the amount of structural steel and resource consumption,but the research on the stability of high-strength steel members is still relatively lacking,and residual stress is an important factor affecting the stability of members.BS700 high-strength steel(nominal yield strength is 700 MPa)has no section steel,so the steel plate is first cold-formed into a channel-shaped section member,and then butt-welded to form a box-shaped section member.However,the welding will generate residual stress in the section of the member,and the research on the influence of welding residual stress on the stability of BS700 high-strength steel box section columns fabricated by welding channel sections is still a lack of relevant information.This paper studies this problem by means of experimental and numerical analysis methods,in order to understand the effect of residual stress on BS700 high-strength steel box section columns fabricated by welding channel sections impact on stability.The mechanical property parameters of BS700 high-strength steel material were obtained through material tensile test.With the help of tensile test,the stress release coefficient when the member that opened was obtained.The blind hole method was used to test the residual stress of the middle section of the BS700 high-strength steel box section columns fabricated by welding channel sections,and the residual stress value of the relevant points on the section was obtained.Combined with the existing research results,the residual stress distribution model of BS700 channel-butt-welded box-section members was proposed.With the help of the finite element analysis software ANSYS and its APDL programmable language,a nonlinear buckling analysis model that can introduce geometric defects and residual stress was written.The model was used for nonlinear buckling analysis of 68 components with and without residual stress.The 68 components simulated the conditions with slenderness ratios of 1
作者
高磊
王靖文
白林越
刘虎
Lei Gao;Jingwen Wang;Linyue Bai;Hu Liu(College of Field Engineering,Army Engineering University of PLA,Nanjing 210007,China;Training Bace of Army Engineering University of PLA,Xuzhou 221004,China)
出处
《钢结构（中英文）》
2022年第11期24-30,共7页
Steel Construction（Chinese & English）
关键词
BS700高强钢
槽形对焊箱形截面
残余应力
非线性有限元屈曲分析
轴压构件
稳定系数
BS700 high strength steel
box section column fabricated by welding channel sections
residual stress
nonlinear finite element buckling analysis
axial compression column
stability factor
