摘要
对工字梁腹板抗剪极限承载力的研究进行总结,对各种公式与文献中的试验结果进行对比,将拉力场理论和转向应力场理论的假定与ANSYS分析揭示的腹板应力发展变化规律进行对比,指出了假定和数值分析结果的不一致。提出了翼缘对腹板转动约束的合理参数,得到精度良好的考虑翼缘约束的腹板剪切屈曲系数。利用得到的屈曲系数,考虑翼缘抗弯承载力的贡献,提出新的工字梁抗剪极限承载力的计算公式。与现有试验数据和ANSYS非线性有限元分析结果的对比,证实建议方法离散性较小,适用范围广,尤其是对于通用高厚比较大的梁,较以往方法有了较大改进。
This paper presents a brief review on the current methods for design of webs in I-girders under shear. Various formulae are compared with available test results. The assumptions used in the tension field theory and the rotated stress theory were compared with the phenomena revealed in a nonlinear analysis by using ANSYS, and the discrepancies between the theories and the numerical analysis were demonstrated. A ratlonat parameter is proposeu to describe the restraint provided to the web by the flanges, and so is a formula for the shear buckling coefficient incorporating this restraint with excellent accuracy. The proposed formula is then employed to construct a new formula to predict the ultimate strength of thin webs in shear, including the contribution from the flange. Good correlation is found between the proposed formula and tests. The proposed method may＂ be employed for both stiffened webs and non-stiffened webs. For webs with larger universal slenderness, the proposed method demonstrates a great improvement when compared with current methods.
出处
《土木工程学报》
EI
CSCD
北大核心
2006年第8期57-64,共8页
China Civil Engineering Journal
关键词
剪切屈曲
极限承载力
腹板
工字梁
shear buckling, ultimate strength, web, I-girder
