钢筋混凝土板动力特性的时变温度效应实验研究
发布时间：2018-12-20 16:32
【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.
[Abstract]:In order to solve the problem that concrete structure is prone to produce uneven temperature distribution under the influence of environmental factors such as solar radiation and temperature change, the experimental model of temperature effect of concrete slab is designed and made, which leads to the change of static and dynamic performance of concrete structure. Several temperature sensors were installed to test the temperature gradient and ambient temperature of the structure, and the temperature variation and the dynamic characteristics of the structure were measured throughout the day. Based on the modal testing theory, a modal identification package is developed to identify the dynamic parameters of the structure, such as frequency, mode shape and damping ratio. The experimental results show that the temperature has a certain effect on the natural frequency of the structure. The first and second order frequencies of the structure are reduced by 0.074 and 0.228 Hz. respectively when the temperature rises at 1 鈩，
本文编号：2388248
[Abstract]:In order to solve the problem that concrete structure is prone to produce uneven temperature distribution under the influence of environmental factors such as solar radiation and temperature change, the experimental model of temperature effect of concrete slab is designed and made, which leads to the change of static and dynamic performance of concrete structure. Several temperature sensors were installed to test the temperature gradient and ambient temperature of the structure, and the temperature variation and the dynamic characteristics of the structure were measured throughout the day. Based on the modal testing theory, a modal identification package is developed to identify the dynamic parameters of the structure, such as frequency, mode shape and damping ratio. The experimental results show that the temperature has a certain effect on the natural frequency of the structure. The first and second order frequencies of the structure are reduced by 0.074 and 0.228 Hz. respectively when the temperature rises at 1 鈩，
本文编号：2388248
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