Long term vibration monitoring of an RC slab: Temperature and humidity effect
Long term vibration monitoring of an RC slab: Temperature and humidity effect
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DOI：
10.1016/j.engstruct.2005.09.001
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发表时间：
2006-02-01
影响因子：
5.5
通讯作者：
Deeks, A
中科院分区：
文献类型：
--
作者：
Xia, Y;Hao, H;Deeks, A
温度和湿度等环境条件的变化会影响结构的振动特性。其他研究人员报告说，由于温度变化，模态频率在一天内变化很大。因此，在基于振动的结构健康监测和损伤识别中，有必要区分环境变化引起的模态特性变化和结构损伤引起的模态特性变化，并量化环境效应。环境条件以复杂的方式影响结构振动特性;本文仅研究频率、振型和阻尼随温度和湿度变化的变化。一个钢筋混凝土板，这是建造和放置在实验室外，已定期振动测试近两年。本文报告了在这段时间内获得的前四种模式的结果。结果表明，频率与温度和湿度呈较强的负相关关系，阻尼比与温度和湿度呈正相关关系，但振型与温度和湿度变化没有明显的相关性。建立了模态特性与环境因子之间的线性回归模型。定量分析表明，材料弹性模量的变化是模态特性变化的主要原因。(C)2005爱思唯尔有限公司保留所有权利。
Changes in environmental conditions such as temperature and humidity affect structural vibration properties. Other researchers have reported that modal frequencies varied significantly in a single day due to temperature change. Therefore, it is necessary to discriminate the variation of modal properties due to environmental change from those caused by structural damage, and quantify the environmental effect in vibration-based structural health monitoring and damage identification. Environmental conditions affect structural vibration properties in a complicated manner; this paper only investigates the variation of frequencies, mode shapes and damping with respect to temperature and humidity changes. A reinforced concrete slab, which was constructed and placed outside the laboratory, has been periodically vibration tested for nearly two years. This paper reports results obtained over that time for the first four modes. It is found that the frequencies have a strong negative correlation with temperature and humidity, damping ratios have a positive correlation, but no clear correlation of mode shapes with temperature and humidity change can be observed. Linear regression models between modal properties and environmental factors are built. A quantification analysis shows that variation of the elastic modulus of the material is the primary cause of the variation of modal properties. (C) 2005 Elsevier Ltd. All rights reserved.