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Stiffness requirement for flat-bar longitudinal stiffener of box-girder compression flanges
International Journal of Steel Structures ( IF 1.5 ) Pub Date : 2009 , DOI: 10.1007/bf03249486
Do Dai Thang , Min-Se Koo , Asif Hameed , Young-Do Jeong

In this paper, the moment of inertia requirement of flat-bar longitudinal stiffener of bottom flange in steel box girder is investigated through finite element modeling. The required minimum stiffness for longitudinal stiffeners of box girder flange is given in the AASHTO LRFD Bridge Design Specification and is modified by Yoo. However, this requirement is adopted for T-shape stiffeners. Here, the effect of important parameters on the minimum required moment of inertia of flat-bar stiffener is numerically investigated by examining the anti-symmetric mode of buckling. This study presents the results that are based on 3D finite-element analysis of four hundred hypothetical compression flange models stiffened by varying numbers of flat-bar longitudinal stiffeners with realistic dimensions such as the height of stiffener, the thickness of the compression flange, the number of longitudinal stiffeners and the aspect ratio of plate panel. A new proposed equation for required minimum stiffness of the flat-bar longitudinal stiffeners is derived from nonlinear regression analyses. Beside that the study has taken into account the effect of boundary conditions and the effect of inelastic transition on the critical buckling stress of compression flange. Through the evaluation of a design example, the validity and reliability of the new proposed equation is demonstrated.

中文翻译:

箱梁压缩法兰的扁杆纵向加劲肋的刚度要求

本文通过有限元建模研究了钢箱梁底部翼缘纵筋纵向加劲肋的惯性矩要求。箱形梁翼缘的纵向加劲肋所需的最小刚度在AASHTO LRFD桥梁设计规范中给出,并由Yoo进行了修改。但是,此要求适用于T形加劲肋。在此,通过检查屈曲的反对称模式,从数值上研究了重要参数对扁杆加劲肋的最小所需惯性矩的影响。这项研究提出的结果基于对400个假设的压缩翼缘模型进行3D有限元分析,这些模型通过变化数量的具有实际尺寸的扁筋纵向加劲肋(例如加劲肋的高度)来加劲,压缩凸缘的厚度,纵向加劲肋的数量和平板的长宽比。从非线性回归分析中得出了新的建议的扁钢纵向加劲肋最小刚度方程。此外,该研究还考虑了边界条件的影响和非弹性过渡对压缩法兰的临界屈曲应力的影响。通过设计实例的评估,证明了新提出方程的有效性和可靠性。此外,该研究还考虑了边界条件的影响和非弹性过渡对压缩法兰的临界屈曲应力的影响。通过设计实例的评估,证明了新提出方程的有效性和可靠性。此外,该研究还考虑了边界条件的影响和非弹性过渡对压缩法兰的临界屈曲应力的影响。通过设计实例的评估,证明了新提出方程的有效性和可靠性。
更新日期:2020-09-14
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