摘要
提出一种确定石油钻井井架结构屈曲荷载的动态评估方法 .其基本思想是 :首先利用井架结构的特征值方程建立井架结构的基本固有频率和其所承受竖向轴向力的关系 ;然后 ,对井架结构分级加载 ,计算或实测出井架结构的各级荷载Ni 所对应的基本固有频率ω1i,由此可以得出井架结构基本固有频率ω21i与所承受荷载Ni 的变化关系曲线 ,相应于ω21i=0时所对应的轴向力即为所求井架结构屈曲荷载 .所建议方法可以与井架结构非破坏性试验相结合来确定井架结构的屈曲荷载 。
In this paper, a dynamic evaluative method is provided to define the buckling load of oilfield derrick. Firstly, the linear relationship between the basic frequency and the axial load of the cantilever structure with axial loading is solved (or determined) from the dynamic eigenvalue equation of the structure. Then, the load of oilfield derrick can be loaded step by step, and the basic frequency ω 2 1i corresponding to the load N i can be calculated or measured out, the linear relationship of ω 2 1i ～N i is drown up using the data mentioned above. The axial force corresponding to ω 1i =0 is the required buckling load of oilfield derrick. The suggested method may evaluate the buckling load of oilfield derrick combining nondestructive testing with calculating. It is convenient to estimate the bearing capacity of oilfield derrick.
出处
《郑州工业大学学报》
2001年第1期10-13,共4页
Journal of Zhengzhou University of Technology
基金
theNaturalScienceFoundationofHenanProvince!(0 1110 4140 0 )
