摘要
针对混凝土结构在太阳辐射和气温变化等环境因素的影响下容易产生不均匀温度分布,从而引起结构静动力性能变化的问题,设计、制作了混凝土板温度效应实验模型,安装多个温度传感器测试结构的温度梯度和环境温度,并测量了一整天的温度变化状况及结构的动力特性.基于模态测试理论开发了模态识别程序包,以识别结构的频率、振型和阻尼比等动力特性参数.实验结果表明,温度对结构的自振频率造成了一定的影响,结构温度升高1℃时引起的第1阶和第2阶频率分别减小0.074和0.228 Hz.
Concrete structures are prone to solar radiation and environmental air changes, which may cause non-uniform temperature distribution and thereby induce changes in structural dynamic properties. An experimental model was constructed to conduct the measurement on time-varying temperature distribution and structural dynamic properties during a whole day. The temperature gradient and ambient temperature were tested by thermal sensors. A program package was developed on the basis of the modal analysis theory to identify the natural frequencies, mode shapes and damping ratios of the slab. The experimental results indicate that the structural natural frequencies were affected by temperature. If the temperature was increased by 1 ℃, the first- and second-order natural frequencies were decreased by 0. 074 and 0. 228 Hz, respectively.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2014年第1期66-71,共6页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(51178366)
中央高校基本科研业务费专项资金资助项目(2013-Ⅱ-015)
关键词
混凝土结构
温度分布
自振频率
阻尼比
concrete structures
temperature distribution
natural frequency
damping ratio
