刚性索自锚式悬索桥动力性能分析

平顶山市建设路立交桥主桥为刚性索自锚式悬索桥,运用MIDAS Civil有限元程序建立该桥的空间有限元计算模型,对其动力性能进行计算与分析。计算结果表明:该刚性索自锚式悬索桥的自振频率较大,竖向频率比横向和扭转频率小;桥塔的横向振型出现较早;主缆与吊杆刚性化能够有效提高桥梁结构的频率,特别是提高桥梁结构横向振动频率,控制索面的横向摆动;刚性索自锚式悬索桥与相同结构的柔性索自锚式悬索桥计算得到的桥梁振型基本一致,刚性索自锚式悬索桥振动频率比柔性索自锚式悬索桥频率有所提高。

Analysis of Dynamic Properties of Rigid Cable Self-Anchored Suspension Bridge

The main bridge of the Jianshe Road Grade Separation Bridge in Pingdingshan City is a rigid cable self-anchored suspension bridge.The program MIDAS Civil was used to set up the spatial finite element calculation model for the bridge and the dynamic properties of the bridge were calculated and analyzed.The results of the calculation demonstrate that the natural vibration frequencies of the bridge are great,the vertical frequency is less than the transverse and torsional frequencies and the transverse vibration modes of the tower occur rather early.The rigidifying of the main cables and suspenders can effectively improve the structural frequencies,particularly the transverse vibration frequencies,of the bridge and can control the transverse oscillation of cable planes.The vibration modes obtained from calculation of the rigid cable self-anchored suspension bridge and the flexible cable self-anchored suspension of similar structure are basically identical and the vibration frequencies of the former are improved to some extent as compared to those of the latter.