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针对服役石油井架的结构特点,考虑几何和材料双重非线性因素,建立了非线性数学分析模型。采用弧长法对荷载-位移平衡路经进行了全过程跟踪研究;对服役井架提出了基于应力和模态进行模型修正、建立基准仿真模型的方法。以油田使用的两部石油井架为例进行仿真分析,结果表明:在屈服点以前,载荷位移曲线基本呈线性关系;载荷值达到临界点之后,位移值迅速增大,而载荷降低,井架结构失稳。应用该方法来跟踪结构非线性平衡路径的全过程可以实现其非线性全过程的仿真分析,能够确定井架的失稳状态、破坏形式、极限承载力,得到令人满意的结果,具有一定的实用价值,适合工程应用。
According to the structural characteristics of the service derrick, taking into account the double nonlinear factors of geometry and material, a nonlinear mathematical analysis model is established. The arc-length method was used to track the whole process of load-displacement balance. The model of service derrick based on stress and modal was revised to establish a benchmark simulation model. Taking the two oil derricks used in the oilfield as an example, the simulation results show that before the yield point, the load-displacement curve has a linear relationship basically. After the load value reaches the critical point, the displacement value increases rapidly and the load decreases. stable. The method can be used to track the whole process of the nonlinear equilibrium path of the structure to realize the simulation analysis of the whole process of nonlinearity, to determine the instability status, failure mode and ultimate bearing capacity of the derrick, and obtain satisfactory results Value, suitable for engineering applications.