第11期 武晓东等：抗弯刚度比对加劲板屈曲性能的影响 ·1357· 200 刚度比小于最佳刚度比，结构发生整体屈曲：反之， 175 则发生局部屈曲，且局部屈曲荷载基本保持不变 32 150 加劲板最佳抗弯刚度比的值为10~20. 33 125 25 (2)在加载方向增加加劲肋布置可以提高加劲 100 =18.2 板的局部屈曲荷载：在非加载方向布置加劲肋不能 =12.8 提高加劲板的局部屈曲荷载 (3)边界条件影响加劲板的屈曲性能.四边固 25 定加劲板的屈曲荷载高于四边简支加劲板 0.010.020.030.040.050.06 (4)加劲板非线性屈曲荷载随刚度比的变化基 加劲板跨中位移m 本是线性的，加劲板抗弯刚度比超过Y。后，增大刚 图13加动板局部屈曲后的荷载-位移曲线 度比可以提高其非线性屈曲荷载 Fig.13 Load to displacement curve after local buckling of stiffened plates 参考文献 180 160 非线性屈曲荷载 Sherbourne A N,Liaw C Y,Marsh C.Stiffened plates in uniaxial 140 compression.Int Assoc Bridge Struct Eng,1971,31:145 三120 2]Massonnet C,Maquoi R.New theory and tests on the ultimate 80 线性屈曲荷载 strength of stiffened box girders/Proceedings of the International 60 Conference on Steel Box Girder Bridges.London,1973:131 40 B]Home M R,Narayanan R.Strength of axially loaded stiffened 20 ot panels.Int Assoc Bridge Struct Eng,1976,36:125 20 30 40 4]Murray N W.Analysis and design of stiffened plates for collapse 抗弯刚度比 load.Struct Eng,1975,53(3):153 图14加劲板线性屈曲荷载与非线性屈曲荷载对比 [5] Chen Y H.Large deformation solution of stiffened plates by a Fig.14 Contrast between linear buckling load and non-inear buck- mixed finite element method.Appl Math Mech,1984,5(1):139 ling load of stiffened plates (陈远汉.加筋板大变形的混合有限元解法.应用数学和力学， 1984,5(1):139) 180 160 [6] Sun S J,Wan Y X.Application of finite strip method to analysis of 140 elastic stability of longitudinal stiffened plates.JWuhan Uni Wa- 120 ter Transp Eng,1987,11 (3):65 100 (孙世基，万燕详.纵向加劲板弹性稳定问题的有限条分析 武汉水运工程学院学报，1987,11(3)：65) 60 Ghavami K,Khedmati M R.Numerical and experimental investi- gations on the compression behaviour of stiffened plates.J Constr 205 1015202530354045 Steel Res,2006,62(11）:1087 抗弯刚度比 [8]Khedmati M R,Rastani M.Ultimate strength and ductility charac- 图15加劲板非线性屈曲荷载提高百分比 teristics of intermittently welded stiffened plates under in-plane axi- Fig.15 Pecent increase of non-inear buckling load of stiffened al compression.JOffshore Mech Arct Eng,2008,130(1):article plates No.011002 4结论 9]Suneel Kumar M,Alagusundaramoorthy P,Sundaravadivelu R. Ultimate strength of stiffened plates with a square opening under (1)加劲板的屈曲性能受抗弯刚度比的影响. axial and out-of-plane loads.Eng Struct,2009,31 (11)2568第 11 期 武晓东等: 抗弯刚度比对加劲板屈曲性能的影响 图 13 加劲板局部屈曲后的荷载--位移曲线 Fig． 13 Load to displacement curve after local buckling of stiffened plates 图 14 加劲板线性屈曲荷载与非线性屈曲荷载对比 Fig． 14 Contrast between linear buckling load and non-linear buck￾ling load of stiffened plates 图 15 加劲板非线性屈曲荷载提高百分比 Fig． 15 Pecent increase of non-linear buckling load of stiffened plates 4 结论 ( 1) 加劲板的屈曲性能受抗弯刚度比的影响． 刚度比小于最佳刚度比，结构发生整体屈曲; 反之， 则发生局部屈曲，且局部屈曲荷载基本保持不变． 加劲板最佳抗弯刚度比的值为 10 ～ 20． ( 2) 在加载方向增加加劲肋布置可以提高加劲 板的局部屈曲荷载; 在非加载方向布置加劲肋不能 提高加劲板的局部屈曲荷载． ( 3) 边界条件影响加劲板的屈曲性能． 四边固 定加劲板的屈曲荷载高于四边简支加劲板． ( 4) 加劲板非线性屈曲荷载随刚度比的变化基 本是线性的，加劲板抗弯刚度比超过 γs 后，增大刚 度比可以提高其非线性屈曲荷载． 参 考 文 献 ［1］ Sherbourne A N，Liaw C Y，Marsh C． Stiffened plates in uniaxial compression． Int Assoc Bridge Struct Eng，1971，31: 145 ［2］ Massonnet C，Maquoi R． New theory and tests on the ultimate strength of stiffened box girders / / Proceedings of the International Conference on Steel Box Girder Bridges． London，1973: 131 ［3］ Horne M R，Narayanan R． Strength of axially loaded stiffened panels． Int Assoc Bridge Struct Eng，1976，36: 125 ［4］ Murray N W． Analysis and design of stiffened plates for collapse load． Struct Eng，1975，53( 3) : 153 ［5］ Chen Y H． Large deformation solution of stiffened plates by a mixed finite element method． Appl Math Mech，1984，5( 1) : 139 ( 陈远汉． 加筋板大变形的混合有限元解法． 应用数学和力学， 1984，5( 1) : 139) ［6］ Sun S J，Wan Y X． Application of finite strip method to analysis of elastic stability of longitudinal stiffened plates． J Wuhan Univ Wa￾ter Transp Eng，1987，11( 3) : 65 ( 孙世基，万燕详． 纵向加劲板弹性稳定问题的有限条分析． 武汉水运工程学院学报，1987，11( 3) : 65) ［7］ Ghavami K，Khedmati M R． Numerical and experimental investi￾gations on the compression behaviour of stiffened plates． J Constr Steel Res，2006，62( 11) : 1087 ［8］ Khedmati M R，Rastani M． Ultimate strength and ductility charac￾teristics of intermittently welded stiffened plates under in-plane axi￾al compression． J Offshore Mech Arct Eng，2008，130( 1) : article No． 011002 ［9］ Suneel Kumar M，Alagusundaramoorthy P，Sundaravadivelu R． Ultimate strength of stiffened plates with a square opening under axial and out-of-plane loads． Eng Struct，2009，31( 11) : 2568 ·1357·