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研究了受压下椭圆钢管的塑性倒塌性能。采用从文献中得到的有限元结果对各参数进行研究,确认决定塑性机理的参数。构件长宽比选为2∶1,研究揭示了4种可能的塑性倒塌机理,并表明分离翻转阀型塑性倒塌机理的可能性最大。针对这种倒塌机理,建立荷载-位移模型,同时考虑钢材弹性、屈服及应变硬化属性,该模型能确定受压椭圆管的全过程荷载-位移性能。对能控制塑性铰形状和大小的参数进行研究,由于这些参数非常关键,因此必须特别注意。将改进的荷载-位移曲线与有限元结果和试验数据进行对比,结果很吻合,这验证了用该模型分析椭圆管倒塌性能的合理性。
The plastic collapse behavior of oval pipe under pressure was studied. The finite element results from the literature were used to study the parameters and confirm the parameters that determine the plastic mechanism. The aspect ratio of the members was chosen to be 2: 1. The study revealed four possible mechanisms of plastic collapse and showed the greatest possibility of separating the reversing valve-type plastic collapse mechanism. According to the mechanism of collapse, a load-displacement model is established, taking into account the properties of steel elasticity, yielding and strain hardening. The model can determine the whole process load-displacement behavior of the compressed oval pipe. The parameters that control the shape and size of the plastic hinges should be studied. Since these parameters are critical, special care must be taken. Comparing the improved load-displacement curve with the finite element results and the experimental data, the results are in good agreement, which verifies the rationality of using this model to analyze the collapse behavior of elliptical tube.