A STUDY ON THE DEVELOPMENT OF STABILITY DESIGN METHODS FOR STEEL FRAMES

钢框架稳定性设计方法开发研究

基本信息

批准号：
05650451
负责人：
USAMI Tsutomu
金额：
$ 1.47万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

The purpose of this study is to develop a design method for stability of steel frames. At the beginning, a critical review of stability design methods for steel frames is performed. Next, a new stability design method for frames is presented. Contray to the effective buckling length concept, the proposed method is based on the elastic second-order analysis. In this method, the introduction of equivalent initial deflections corresponding to the imperfections is of utmost importance. Therefore, a new equivalent deflection formula using curvature is suggested. Moreover, a methodology is proposed to explain the systematic application of this formula to a frame with stepped cross section. The validity of the method is demonstrated by some examples. Finally, a simplified analysis of steel frame strength by the second-order analysis, consideringthe local buckling of component plates, is shown. In the analysis, the initial equivalent deflection and local buckling criterion of stub column are introduced. On the other hand, although several elaborate analyzes have been performed to make clear the interactive behavior, there is little agreement with each other. Therefore, a detailed comparison of those results has shown that the analysis using moment-thrust-curvature relations are in best agreement with Q-factor method, accuracy of which was confirmed by experiments. Accordingly, the validity of the proposed simplified analysis was examined by comparison with the analysis using moment-thrust-curvature relations.

这项研究的目的是开发一种设计方法，以实现钢框的稳定性。一开始，对钢架的稳定性设计方法进行了批判性审查。接下来，提出了一种新的框架稳定性设计方法。符合有效的屈曲长度概念，提出的方法基于弹性二阶分析。在这种方法中，引入与缺陷相对应的等效初始偏转至关重要。因此，建议使用曲率进行新的等效挠度公式。此外，提出了一种方法来解释该公式在带有阶梯横截面的框架上的系统应用。该方法的有效性通过一些示例证明。最后，考虑到组件板的局部屈曲，通过二阶分析对钢架强度进行了简化的分析。在分析中，引入了初始等效挠度和存根柱的局部屈曲标准。另一方面，尽管已经进行了几项精心设计的分析以清除互动行为，但彼此之间几乎没有共识。因此，对这些结果的详细比较表明，使用瞬间曲面关系的分析与Q因子方法最吻合，实验证实了该方法的准确性。因此，通过使用瞬间曲面关系进行比较，通过比较分析来研究所提出的简化分析的有效性。