环境温度对连续箱梁刚构桥相对小波熵指标的影响研究

发布时间：2019-05-17 19:40

【摘要】：以一座高速公路预应力混凝土连续箱梁刚构桥为工程背景,结合健康监测系统的长期测试数据,研究环境温度对相对箱梁桥小波熵指标S_(WT)的影响规律。首先,介绍了环境激励下桥梁结构相对小波熵指标的计算方法。其次,利用实时监测数据,分析得到了箱梁桥各截面的实测相对小波熵指标日变化和年变化规律。最后,基于逐步最优线性回归分析方法建立了相对小波熵指标与温度时、空间分布的多元线性回归模型,并提出了相对小波熵指标的温度修正模型。结果表明,所建立多元线性回归模型具有较好的拟合和预测精度,通过温度修正可以有效地剔除环境温度变化对预应力混凝土箱梁桥相对小波熵指标的影响,使其有效地应用于桥梁的损伤识别。
[Abstract]:Based on the engineering background of a prestressed concrete continuous box girder rigid frame bridge of expressway and the long-term test data of health monitoring system, the influence of ambient temperature on wavelet entropy index S _ (WT) of box girder bridge is studied. Firstly, the calculation method of relative wavelet entropy index of bridge structure under environmental excitation is introduced. Secondly, based on the real-time monitoring data, the daily and annual variation of the measured relative wavelet entropy index of each section of the box girder bridge is obtained. Finally, based on the stepwise optimal linear regression analysis method, a multivariate linear regression model for spatial distribution of relative wavelet entropy index and temperature is established, and a temperature correction model of relative wavelet entropy index is proposed. The results show that the multiple linear regression model has good fitting and prediction accuracy, and the influence of ambient temperature change on the relative wavelet entropy index of prestressed concrete box girder bridge can be effectively eliminated by temperature correction. So that it can be effectively applied to bridge damage identification.
【作者单位】：福州大学土木工程学院;福州大学至诚学院;东南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51178101)
【分类号】：U446;U448.23

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