【作者】 赵小勇；

【导师】 陈树华；

【作者基本信息】 哈尔滨工程大学 ， 结构工程， 2007， 硕士

【摘要】 工字形截面钢梁在弯矩、剪力以及局部荷载单独或者联合作用下，腹板的部分板面会偏离原来的位置而发生波形凸曲，原《钢结构设计规范》(GBJ17-88)中关于腹板局部稳定的计算公式是基于无限弹性的完善板假定，现行《钢结构设计规范》(GB50017-2003)对此部分内容作了较大改动，考虑了屈曲进入弹塑性阶段以及初始几何缺陷的影响。针对现行规范钢梁腹板局部屈曲的公式，采用有限元软件进行建模分析，考虑了不同几何尺寸(高厚比b/t、宽高比a/b和局压作用范围c的影响，对梁腹板区格在多种应力作用下的局部屈曲相关公式进行了验证，分析表明该相关公式在弹性阶段的安全度可以得到保证，但在弹塑性阶段有偏于不安全的趋势。为此在考虑了工字型截面梁腹板的弹塑性屈曲性能以及不同局压应力作用范围c的影响后，在规范公式的基础上，提出了建议修正公式，并且通过不同的高厚比b/t、宽高比a/b和局压作用范围c的算例结果的分析，表明了建议修正公式可为工程设计借鉴和参考。更多还原

【Abstract】 Local buckling may occur in web plates in I-girders subjected to bending, shear and patch loading. The computational formula for local stability of web was based on the assumption of infinite-elastic perfect plates in the steel structures design code (GBJ17-88).But in the revised code (GB50017-2003) this formula was made big change with reference early geometric imperfection and elastic-plastic buckling stage. so this paper adopted finite element method to make models and analyze , The influence of various geometric parameters (highness-to-thickness b/t, width-to-highness a/b and the distributed range of partial edge loading on beam web) are considered. The local buckling correlative formula for transverse stiffened web panels under combined stresses is verified, and the analysis had indicated this correlation formula might obtain the guarantee of security in the elastic stage, but in the elastic-plastic stage it is in favor of the unsafe tendency, so the suggestion correlation formula is proposed with reference elastic-plastic buckling and the distributed range of partial edge loading. The analysis to computed result indicated the suggestion correlation formula can provide reference for the engineering design.更多还原