中、下承式钢管混凝土拱桥面内振动模态分析  

MODAL ANALYSIS OF IN-PLANE VIBRATIONS FOR HALF-THROUGH AND THROUGH CONCRETE-FILLED STEEL TUBULAR ARCH BRIDGES

作　　者：吴庆雄[1] 黄宛昆[1] 陈宝春[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《工程力学》2012年第11期221-227,共7页Engineering Mechanics

基　　金：教育部科学技术研究重点项目(210109);福建省教育厅科技项目(JA09023)

摘　　要：采用Katayama提出的随机子空间识别法对环境脉动下八座钢管混凝土拱桥实测动力响应进行识别,与采用最大熵谱法获得的计算结果进行的比较验证了采用方法的正确性。建立了实测桥梁的有限元模型,理论模态与试验模态吻合良好,讨论了主拱跨径、截面和桥道系结构等结构参数对钢管混凝土拱桥面内振动模态特性的影响,指出了钢管混凝土拱桥面内一阶基频的统计近似公式的局限性,提出了基于Rayleigh能量法的静力计算方法,可用于预估和校核中、下承式钢管混凝土拱桥面内低阶频率。The dynamic responses under an ambient vibration for eight half-through and through concrete-filled steel tubular （CFST） arch bridges are measured. The Stochastic Subspace Identification （SSI） method presented by Katayama is used for experimental modal analyses, and the feasibility of this method is verified by comparing with the results obtained by the Maximum Entropy Method. Compared with the experimental modal analysis by SSI method, the correctness of theoretic modal analysis by the finite element method is confirmed. The influence of some parameters, such as the arch main span, cross section and deck system, is discussed on the in-plane vibration properties of CFST arch bridges. The limitation of the statistical approximate formula for the in-plane first frequencies of CFST arch bridges is pointed out, and the static method based on the Rayleigh energy method is presented, which can predict and check in-plane low frequencies of half-through and through CFST arch bridges.

关 键 词：桥梁工程 钢管混凝土拱桥 面内振动 模态分析 环境脉动 随机子空间识别法 Rayleigh能量法 

分 类 号：TU317[建筑科学—结构工程]