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首页> 外文期刊>International journal of steel structures >Effects of Modeling Parameters on Dynamic Performance of Railway PSC Bridge Girders
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Effects of Modeling Parameters on Dynamic Performance of Railway PSC Bridge Girders

机译：建模参数对铁路PSC桥梁动力性能的影响

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摘要

This study investigated the effects of finite element modeling parameters on the dynamic characteristics and responses of railway prestressed concrete bridge girders. Free vibration analyses using different modeling parameters showed that the natural frequencies increased when an anchorage was included or when the upper flange thickness was kept constant in the modeling. The maximum dynamic responses of the girder at different speeds of two trains [a high-speed train (KTX) and a freight train] were compared using different modeling parameters. Changes in the flange thickness did not have any significant effect on the maximum vertical displacement. However, the maximum acceleration of the girder for the flange modeled with the originally designed varying thickness was higher than that for the flange modeled with the average thickness as a constant. This difference became more significant as the train speed approached the critical speed of resonance. Regardless of whether the anchorage was modeled, no significant change was found in the maximum vertical displacement for both KTX and the freight train. The vertical accelerations for both the trains were generally lower when the anchorage was modeled. Particularly, the vertical acceleration for KTX near its critical speed of resonance showed larger differences among the finite element models.
机译：本研究研究了有限元建模参数对铁路预应力混凝土桥梁大梁动力特性和响应的影响。使用不同建模参数的自由振动分析表明，当包含锚固或建模中上翼缘厚度保持恒定时，固有频率会增加。使用不同的建模参数比较了两列火车（高速火车（KTX）和货运火车）在不同速度下的梁的最大动力响应。法兰厚度的变化对最大垂直位移没有明显影响。但是，以最初设计的变化厚度建模的法兰的梁的最大加速度高于以平均厚度为常数建模的法兰的梁的最大加速度。随着列车速度接近共振的临界速度，这种差异变得更加明显。无论是否对锚固进行建模，KTX和货运列车的最大垂直位移都没有发现显着变化。在对锚定进行建模时，两列火车的垂直加速度通常较低。特别是，KTX在其共振临界速度附近的垂直加速度在有限元模型之间显示出较大的差异。

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