Transverse Stiffener Requirements to Develop Shear-Buckling and Postbuckling Resistance of Steel I-Girders
Transverse Stiffener Requirements to Develop Shear-Buckling and Postbuckling Resistance of Steel I-Girders
复制标题
提高工字梁抗剪屈曲和后屈曲抗力的横向加劲肋要求
DOI：
10.1061/(asce)st.1943-541x.0000867
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
D. White
中科院分区：
文献类型：
--
作者：
Y. D. Kim;D. White
传统上，在AISC和AASHTO规范中，横向加劲肋的设计一直基于两个标准：确保腹板剪切屈曲荷载下加劲肋横向挠度接近于零的惯性矩要求和确保在腹板后屈曲条件下横向加劲肋可以作为有效的普拉特桁架的竖向的面积要求。然而，多位研究人员发现，横向加劲肋的响应主要是由抑制腹板平面外变形而引起的弯曲作用。因此，最新的AASHTO和AISC规范采用了横向加劲肋尺寸规则，仅关注横向加劲肋转动惯量的要求。本文总结了导致制定这些新规则的基础研究的各种细节，并概述了新规范条款的适当应用。
Traditionally, the design of transverse stiffeners in the AISC and AASHTO specifications has been based on two criteria: a moment of inertia requirement to ensure near-zero lateral deflection of the stiffeners at the web shear buckling load, and an area requirement to ensure that the transverse stiffeners can serve as verticals in an effective Pratt truss in the postbuckling condition of the web. However, multiple investigators have found that the transverse stiffener response is dominated by bending actions caused by restraint of the out-of-plane deformation of the web panels. As such, the latest AASHTO and AISC specifications have adopted transverse stiffener sizing rules that focus solely on a transverse stiffener moment of inertia requirement. This paper summarizes various details of the underlying research leading to the development of these new rules and outlines the proper application of the new specification provisions.