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冷弯薄壁型钢杆件通常发生局部-整体交互屈曲,它极大地影响了梁柱结构的承载力。与单板屈曲一样(包括横截面板单元间的相互作用),提出了能进行恰当的一阶稳定性分析的细长褶皱截面,它能确定临界屈曲荷载和相关模态。作为对传统有效面法(简称EAM)的改进,基于截面的实际局部屈曲结果的有效截面法(简称ESM)和梁柱承载力修正公式共同确定了冷弯杆件的设计。采用北美AISI标准中由直接强度法(简称DSM)确定的承载力公式。而且,作为所提公式的结果,有效截面方法能与传统有效宽度法(简称EWM)一起运用。它容许与冷弯杆件设计规范的主要部分有一定误差以提高适用范围。提出有效截面法的同时,也列出了公式和表格。这个表格使设计者能直接获得常截面临界屈曲压力和弯矩,提高了该方法的优越性。
Cold-formed thin-walled steel members usually occur local - overall reciprocal buckling, which greatly affects the bearing capacity of beam-column structure. Similar to the buckling of veneers (including the interaction of cross-section panel elements), slender wrinkled sections that provide an appropriate first-order stability analysis are proposed to determine the critical buckling loads and associated modalities. As an improvement on traditional effective surface method (EAM), the design of cold-formed bar is determined by the effective cross-section method (ESM) and the beam-bearing capacity correction formula based on the actual local buckling results. The bearing capacity formula determined by the direct strength method (DSM) in the North American AISI standard is adopted. Moreover, as a result of the proposed formula, the effective section method can be used with the traditional effective width method (EWM for short). It allows for a margin of error with the main part of the design specification for cold-formed bars to increase the applicability. Proposed effective cross-section method, but also lists the formulas and tables. This form allows designers to directly obtain the critical buckling pressure and bending moment of normal cross-section, which improves the superiority of this method.