考慮信噪比和車-橋耦合效應(yīng)的橋梁健康監(jiān)測(cè)策略
[Abstract]:In order to discard a large amount of data with low signal-to-noise ratio (SNR) or no abnormal signal to noise ratio (SNR), save computing resources and improve the efficiency of analysis, the health monitoring of bridges can be realized on the basis of theoretical basis. A bridge monitoring strategy considering signal-to-noise ratio (SNR) and vehicle-bridge coupling effect is proposed. Based on the analysis of monitoring signal components, it is pointed out that in order to realize the monitoring strategy, it is necessary to determine a reasonable and accurate monitoring threshold according to the vehicle-bridge coupling dynamic theory. The vehicle group is equivalent to the time-varying dynamic model with the main body part and the coupled uniform mass, and the dynamic equilibrium equation and its analytical expression of the bridge structure coupled with the mobile vehicle group are established. Taking the health monitoring of a simple supported beam as an example, according to the vehicle-bridge coupling theory, this paper analyzes the influence of vehicle mass, speed and vibration frequency on the dynamic response of the bridge. Combining with the actual monitoring data, the monitoring threshold is determined and the monitoring strategy is realized. The experimental results show that the monitoring strategy is effective.
【作者單位】: 北京工業(yè)大學(xué)建筑工程學(xué)院工程抗震與結(jié)構(gòu)診治北京市重點(diǎn)實(shí)驗(yàn)室;大連海事大學(xué)道路與橋梁工程研究所;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(51108009) 高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金資助項(xiàng)目(20111103120022)
【分類號(hào)】:U446
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