论文部分内容阅读
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 method of random subspace identification proposed by Katayama was used to identify the measured dynamic responses of eight CFST arch bridges under environmental pulsation. The comparison with the results obtained by the maximum entropy spectrum method verified the correctness of the proposed method. The finite element model of the measured bridge was established. The theoretical model was in good agreement with the experimental mode. The influence of structural parameters such as span, cross section and bridge structure on the vibration mode characteristics of CFST arch bridge was discussed. The limitations of the statistical approximate formula of the first-order fundamental frequency in the CFST arch bridge are presented. The static calculation method based on the Rayleigh energy method is proposed, which can be used to estimate and check the low-order frequency of the CFST arch bridge.