局部削弱压杆的稳定性实验研究

因为缺乏相关的理论和实验研究,局部削弱压杆的临界载荷通常按无削弱压杆处理.工程中,局部削弱压杆的使用极为普遍.对局部削弱压杆的稳定性的定量研究结果,无论是工程中,还是材料力学教学中都是迫切需要的.本文在前人理论研究的基础上,对局部削弱压杆的临界载荷作了定量的实验研究.试验结果表明,对细长压杆,即使削弱部分的刚度下降达到38.9%,对失稳临界载荷的影响仍可忽略;试验结果与黄玉珊提出的对局部削弱压杆稳定性的定量计算方法也比较接近.研究结果对部分工程问题和材料力学教学都具有一定的指导意义.

Experimental Research on Buckling of Locally Weakened Columns

The buckling load of locally weakened columns is calculated by Euler formula as usual due to the lack of relevant theoretical and experimental study results. Locally weakened columns are widely used in engineering. Quantitative buckling load results of locally weakened columns are pressing needed not only in engineering but also in teaching of material mechanics. Based on the predecessor's theoretical studies of the problem, an experimental study was carried out. Results show that for a long and thin column, the influence of weakened cross section on buckling load can be neglect even if the rigidity of a weaked cross section drops to 38.9% of original rigidity. The quantitative calculating results of buckling load for locally weakened columns using the method presented by Huang Yu-shan are close to the experimental results.The quantitative results proposed in this paper are useful for solving engineering problems and for teaching of material mechanics.