CAJ | 학술논문

采用特征值屈曲的有限元法,在两端固支和铰支约束条件下,对底部受自重及轴向压力的直井管柱进行了临界失稳长度分析. 分析结果表明:两端固支和铰支的约束条件对管柱临界失稳长度的影响较大,工程中应取接近于固支的临界失稳长度;底部轴向压力与临界失稳长度呈非线性递减关系. 对底部轴向压力和临界失稳长度进行了无量纲化,可用于中和点以下不同管柱尺寸和底部轴向压力的临界失稳长度计算.
채용특정치굴곡적유한원법,재량단고지화교지약속조건하,대저부수자중급축향압력적직정관주진행료림계실은장도분석. 분석결과표명:량단고지화교지적약속조건대관주림계실은장도적영향교대,공정중응취접근우고지적림계실은장도;저부축향압력여림계실은장도정비선성체감관계. 대저부축향압력화림계실은장도진행료무량강화,가용우중화점이하불동관주척촌화저부축향압력적림계실은장도계산.
It defines the assumption of the same deflection curve function of the conventional energy method, uses finite element method to analyze the critical buckling length of the vertical pipe string.Under the constraint con-ditions of both ends hinged or fixed, conditions have great influence on the critical buckling length of pipe string. Buckling length should be close to the buckling length of fixed constraint in engineering practice.The relation-ship between the axial compression load and critical length is non-linear degressive.It obtains the dimension-less of the axial compression load and the critical length, and calculates the critical buckling length below the neutral point with different sizes of pipe string and different bottom axial pressure.