摘要
以白河特大桥主桥为研究对象,采用有限单元法,对其进行抗震性能分析,以提高其抗震能力;运用有限元程序Midas/Civil,结合该桥的结构特点,建立了桥梁的空间有限元模型,对其分别进行自振特性、反应谱和地震波下的时程响应分析。计算结果表明:该桥梁整体刚度较大,整体竖向刚度相对其横向、纵向刚度弱,桥梁振动以竖向振动形式为主;24号桥墩墩底截面受力最为不利,可作为全桥抗震设计的控制截面;并建议在主梁两端支座处需采取一定挡护措施,避免主梁两端在地震中产生横向偏离支座的情况发生。
The aseismic performance of the main bridge of Bai River Grand Bridge was analysed by the finite element method to improve its structural seismic resistance capability. According to its characteristic, the space finite element model of the bridge was established by the Midas/Civil program, the analysis on the structural self- vibration characteristic, response spectrum and time domain response under earthquake wave were all made.The results of calculation indicate that, the whole rigidity of bridge is strong;vertical vibration modes give priority to the bridge; the most unfavorable working section is the bottom section of the pier No. 24, which can be regarded as the control section in aseismic design of the bridge; the baffle should be used besides the bearings at the two ends of girder to keep the ends of girder from departing from the bearings.
出处
《公路交通科技》
CAS
CSCD
北大核心
2008年第3期103-108,共6页
Journal of Highway and Transportation Research and Development
基金
河南省自然科学基金资助项目(072300440160)
关键词
桥梁工程
连续梁桥
有限元法
抗震性能
地震反应
bridge engineering
continuous beam bridge
finite element method
aseismatic performance
earthquake response
