习营钢管混凝土拱桥动力特性分析  

Dynamic Characteristic Analysis of Concrete-Filled Steel Tube Arch Bridge in Xiying

作　　者：朱亚飞[1] 何伟[2] 陈桥阳 李亚伟[3] 

机构地区：[1]商丘学院土木工程学院,河南商丘476113 [2]华北水利水电大学土木与交通学院,郑州450045 [3]水利部综合事业局,北京100053

出　　处：《河南大学学报（自然科学版）》2016年第4期482-486,共5页Journal of Henan University:Natural Science

基　　金：河南省基础与前沿技术研究项目(152300410241);郑州市科技局科技发展计划项目(20130844);河南省教育厅研究计划项目(13B130110)

摘　　要：基于有限元方法,以ANSYS为平台建立了南阳淅川段习营下承式钢管混凝土拱桥三维有限元模型,采用子空间迭代法求解桥梁的自振频率和振型,并结合桥面振动实测频率,验证了桥梁模型的准确性.计算结果显示,桥梁1阶竖向振动频率的实测值与理论值接近,模型精度较高.拱桥第1阶振型为拱肋横向弯曲,第2、3阶振型均为桥面系竖向弯曲.低阶振型主要以拱肋的横向振动或桥面系的竖向弯曲为主,说明该桥拱肋横向刚度明显小于竖向刚度,桥面系横向刚度远大于竖向刚度,体现了下承式钢管混凝土拱桥的动力性能特征.计算结果为结构性能评估与抗震设计提供了依据.Based on the finite element method, a three-dimensional finite element model of through type concrete-filled steel-tabular arch bridge in Xichuan Nanyang was established by the finite element software ANSYS. According to subspace iteration method, natural frequencies and vibration mode shapes of the bridge were solved in this software. Then we verified the accuracy of the bridge model combining with the measured frequency of bridge deck vertical vibration. The calculation results show that the measured frequency of first order vertical vibration closes to the theoretical value which proves the model has higher accuracy. The first order vibration mode is lateral bending of arch rib, while the second order and the third order vibration mode are vertical bending of bridge deck. So the lower order vibration mode is mainly lateral bending of arch rib or vertical bending of bridge deck, which shows that the lateral stiffness of arch rib is much less than the vertical stiffness, however, lateral stiffness of bridge deck is significantly greater than the vertical stiffness. Dynamic characteristics of through type concrete-filled steel-tabular arch bridge are reflected. The calculation results provide a basis for structural behavior evaluation and seismic design.

关 键 词：钢管混凝土拱桥 下承式 动力特性 振型 频率 

分 类 号：U448.222[建筑科学—桥梁与隧道工程]