非线性全过程分析在ZJ70D型钻机井架承载性能仿真中的应用

Application of Full Range Nonlinear Analysis Method to Simulation for Bearing Capacity of ZJ70D Rig Derrick

针对ZJ70D型钻机井架的结构特点,考虑梁柱效应以及大位移效应,根据集中塑性法,提出弹塑性大位移分析的简化单元模式和计算方法。建立石油井架非线性全过程分析的数学模型。采用弧长法实现了结构非线性平衡路径的全过程跟踪。对ZJ70D型钻机井架进行承载性能仿真。结果表明:应用该方法可以确定井架的失稳状态、破坏形式及极限承载力,为石油井架的承载力预测和安全评估提供了依据,具有一定的实用价值。

Aiming at structure feature of ZJ70D rig derrick,a simplified element model and a relevant calculating method were proposed for an advanced large-displacement elastic-plastic analysis by according to the effect of girder-column and large displacement and using the concentrated inelasticity approach.The mathematical model was established and the full range elastic-plastic analysis was achieved with arc-length method.Simulation analysis is carried out for ZJ70D rig derrick.The results indicate that the failure shape,dangerous position and ultimate bearing capacity can be obtained.This method provides an effective way for the safety evaluation and state monitoring of oil-derrick with damage,suitable for practical engineering applications.