空间扭索面曲塔斜拉桥振动破损有限元仿真

Finite Element Simulation of Vibration Damage of Curved Tower Cable-Stayed Bridge with Spatial Torsion Cable Plane

为了提高斜拉桥的安全性和稳定性,提出空间扭索面曲塔斜拉桥振动破损有限元仿真方法。使用向量有限元模型研究桥梁的动态特性,得出空间扭索面曲塔斜拉桥每个质点的内力和外力分布情况,通过中心差分法计算出桥梁每个质点位置,得出斜拉桥的最大应力。扩展有限元模型,分别计算斜拉桥纤维拉伸失效、纤维压缩失效、基体拉伸失效以及基体压缩失效的四种空间扭索面曲塔斜拉桥破坏模式判定方式,实现斜拉桥破坏的有限元分析。仿真结果表明,所提方法的桥梁频率振动与实际结果拟合较好,计算步长少,损伤破坏分析效率较高。

In order to improve the safety and stability of cable-stayed bridges,this paper proposed a finite element simulation method for vibration damage of space plane reverse cable-stayed bridge.Firstly,we used the finite element model to research the dynamic characteristics of the bridge,thus obtaining the internal force and external force distribution of each mass point in the space plane reverse cable-stayed bridge.Then,we used the central difference method to calculate the position of mass point,and thus to determine the maximum stress of the cable-stayed bridge.Next,we expanded the finite element model and determined the four types of failure modes(fiber tensile failure,fiber compressive failure,matrix tensile failure,and matrix compressive failure) separately.Finally,we completed the finite element analysis.The simulation results show that the proposed method can better fit the frequency vibration of the bridge,with fewer steps.The efficiency of analysis is high as well.