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    In this paper,the curved shell finite element method is adopted to analyse the ultimate strength of stiffened plates under compression with different stress gradients as well as the interaction curves P'/P_y'-M'/M_p' of thin-walled box sections and the ultimate strength of axially and eccentrically loaded box columns in consideration of the post-buckling effect of plates.
    本文采用曲壳有限单元法计算了具有不同应力梯度的加劲板件的极限强度、薄壁方管截面的P′/P′_y-M′/M′_D相关曲线和轴心及偏心受压方管柱考虑板件屈曲后效应的极限承载力。
    A Semi-Energy Method of Buckling Analysis of Edge-Stiffened Plates
    卷边板件屈曲分析的半能量法
    A program finite strip analysis model is formed and finite strip computer software is also made in this paper. The buckling behaviors of plates with flat-hat intermediate stiffener are analyzed by employing finite strip method.
    论文建立了有限条法分析模型,编制了有限条计算程序,用有限条法分析了帽形中间加劲板件的屈曲和帽形肋条的加劲性能。
    The effects for buckling stress of the changes of the stiffener rigidity, shape, dimension, as well as its location are analyzed in this thesis.
    论文对帽形中间加劲肋的刚度、加劲肋的形状、尺寸和位置变化对中间加劲板件屈曲应力的影响作了分析研究。
    This kind of design method can lead to local buckling of web,but this dosen't mean to lose bearing capacity.
    如此虽然可能引起腹板的局部屈曲,但板件的屈曲并不意味着构件承载能力的丧失。
    formulations of buckling coefficients are induced. It is revealed that according to the provisions of the GBJ18-87 specification, the calculation of members aren't safe under axial compress, and conservative under tending. The recommended formulations of the effective width are presented at the end of this paper.
    采用有限条法分别对轴心受压、受弯卷边Z型钢构件的弹性相关屈曲作了分析,推导出板件屈曲系数表达公式,并阐明按现行《冷弯薄壁型钢结构技术规范》(GBJ18-87)计算轴压卷边Z型钢构件偏于不安全,而对于受弯构件又过于保守,最后给出了计算Z型钢有效宽度的建议公式。
    An energy method is used to analyze the buckling or interaction buckling behavior of edge stiffened plate elements and members under combined compression and bending. The buckling coefficients and the restrained coefficients considering the plate assembly effects on edge stiffened plate elements are obtained, and the formulae of buckling coefficients and restrained coefficients are adopted in the new Chinese Technical Code for Design of Cold formed Thin wall Steel Structures(GB 50018).
    通过屈曲理论分析,得到了非均匀受压边缘加劲板件的屈曲系数及其反映板组效应的约束系数,并将其引入新修订的《冷弯薄壁型钢结构技术规范》(GB50018)的有效宽厚比设计方法中。
    The effects on buckling stress of the changes of the stiffener rigidity, shape, dimension and location, as well as the required adequate stiffening rigidity of flat-hat stiffened plates are put to analysis in details in the paper.
    文中详细分析了帽形肋条的刚度、形状尺寸和位置变化对中间加劲板件屈曲应力的影响,以及帽形中间加劲板件的充分加劲刚度的计算.
    But, in the engineering practice, some struts may be restrained against twisting and are dispensed with such checking, so that the web may buckle locally as a plate with one longitudinal edge fixed and the other edge free.
    然而,在工程实践中有些杆件扭转受到约束,从而不去验算其弯扭屈曲。 此时,腹板有可能作为一纵边嵌固、另一纵边自由的板件屈曲
 

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