高强钢薄壁箱形截面梁稳定性.pdf

40 6 2010 6 1 2 2 1 高 磊 , 孙宏才, 徐关尧, 戚 亮 ( 1 , 210007; 2 , 100093) [ ] , , , , [ ] ; ; ; ; Stability study on thin-walled box- section beam of high-strength steel 1 2 2 1 Gao Lei , Sun Hongcai , Xu Guanyao , Qi Liang ( 1 Enginee ing Institute of Enginee ing Co ps, PLAUST, Nanjing 210007, China; 2 No. 2 Institute of Enginee Co ps, Gene al Equipment Headqua te s, Beij ing 100093, China) Abstract: Basing on elasto- plasticity la ge deflection finite element theo y of the thin-walled steel plate, all kinds of impe fections we e conside ed. The pa amete s that included the slende ness atio, the width-thickness atio of flange and the section side atio we e studied. Conside ing the elative buckling of the local and ove all of the beam, the ultimate load- ca ying calculation exp ession is put fo wa d, which takes the width- thickness atio of flange and the section side atio as the pa amete s. The effectiveness of the exp ession is ve ified. T he esults can p ovide efe ence fo the design of the thin-walled box- section beam of high- st ength steel. Keywords: box beam; stability facto ; thin-walled box- section beam; high- st ength steel; elative buckling 0 , [ 1] 5 , E = 2106 @ 10 MPa, , , 745MPa 18Mn2C MoBA R ( R ) ( s 012 700MPa, , ) 2, ANSYS810 420MPa , shell 181 ,