摘要
以大广线开封黄河二桥主桥——7塔8跨预应力混凝土矮塔斜拉桥为研究对象,借助MIDAS/Civil有限元程序建立了该桥梁空间有限元计算模型,采用子空间迭代法计算了桥梁的动力特性.计算结果表明,该桥梁的低阶振动主要表现为桥面系的整体竖向振动和桥塔的横向振动,桥梁结构的自振周期较大,振型较为密集,由于该桥梁宽跨比较大,桥面整体竖向振动出现比较早,桥梁的第1阶扭转频率与第1阶竖弯频率之比为4.01,表明该桥梁具有良好的气动稳定性.
The main bridge of the Kaifeng Yellow River 2nd bridge of Daguang freeway is 7-tower and 8-span prestressed concrete extradosed cable-stayed bridge.By adopting MIDAS/Civil finite element procedure,the space finite element calculating model is set up,and the dynamic performance using sub-spatial repetitive process is calculated.The result indicates that the low steps vibration of the bridge mainly takes the form of whole vertical vibration of the bridge deck system and horizontal vibration of the bridge towe...
出处
《郑州大学学报（理学版）》
CAS
2008年第1期120-124,共5页
Journal of Zhengzhou University:Natural Science Edition
关键词
有限元法
自振频率
振型
矮塔斜拉桥
finite element method
natural vibration frequency
vibration model
extradosed cable-stayed bridge
