用BEAM18x单元替代三主梁力学模型

Using BEAM18x Element to Replace Triple-girder Model

三主梁模型考虑截面的翘曲刚度,能准确计算结构的扭转频率,可用于模拟斜拉桥开口截面主梁。三主梁模型适用于结构动力特性分析,但不能直接用作动力分析模型。在AN SY S软件中以BEAM 18x单元建立单主梁模型,以替代三主梁模型。经算例验证,该方法建模简单,计算精度高。

The triple-girder model can consider the warping constant of deck and can calculate the warping frequency of the structure of cable-stayed bridges, which can be applied to an mechanical model of deck with an open cross section. It can also be applied to calculating the dynamic characteristics, but not suitable for the dynamic model. This paper puts forward a new single spine girder model using ANSYS beamlSx element to replace the triple-girder model. It is proved simple and feasible for simulating the deck with an open cross section.