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本文对截面部分进入塑性的钢偏压杆腹板的屈曲进行了研究。假定材料为理想弹塑性,选取典型截面与规范(T J 17—74)相同。首先分析了承受偏压,剪切组合荷载的周边简支薄板的弹塑性屈曲强度,提出了近似计算公式并与试验结果吻合。然后分析了工字形,箱形截面钢偏压杆极限荷载前腹板的塑性开展及受力状态。根据等稳原则计算了腹板宽厚比限值,提出了计算腹板宽厚比限值的简易方法。
In this paper, the buckling of the web of steel biased rods with plastic sections is studied. Assuming that the material is ideally elastoplastic, the typical section is selected to be the same as the specification (T J 17-74). Firstly, the elasto-plastic buckling strength of the simply supported thin plates subjected to the combined bias and shear loads is analyzed. The approximate formula is proposed and is in agreement with the experimental results. Then, the I-shape and the plasticity of the web before the ultimate load of the box-section steel biased bars were analyzed. Based on the principle of equal stability, the width-to-thickness ratio of the web was calculated, and a simple method for calculating the width-to-thickness ratio of the web was proposed.