| 摘要: |
| 通过理论推导与现场实测研究了自然环境温度变化和混凝土温度响应规律；基于自然环境温度变化趋势，采用分段拟合法建立了自然环境温度作用谱模型；基于自然环境温度作用谱和混凝土温度响应，建立了混凝土温度响应谱模型.通过现场测定典型天气温度波动规律，验证了自然环境温度作用谱和混凝土温度响应谱模型的合理性及精度.结果表明：自然环境温度变化呈周期性波动，自然环境温度作用谱模型可描述自然环境温度波动规律及其特征；基于该模型所绘制曲线与自然环境实测温度吻合较好且精度较高.混凝土温度响应谱模型亦可表征其内部的温度变化趋势，理论拟合曲线与实测温度吻合.混凝土温度响应谱与自然环境温度作用谱之间的异同主要表现为周期相等、时间滞后和温度波动幅值衰减等方面. |
| 关键词: 温度 作用谱 响应谱 滞后 波动 |
| DOI：103969/j.issn1007 9629201403029 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51278496,51378506)；铁道部科技研究开发计划项目(2010G018)；教育部博士研究生学术新人奖项目(094801016) |
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| Spectra of Temperature Action and Response ofConcrete in Natural Environment |
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LIU Peng, YU Zhiwu, SONG Li
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School of Civil Engineering, Central South University, Changsha 410075, China
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| Abstract: |
| The change rule of the natural environment temperature and the temperature response characteristic of concrete were investigated by theoretical inference and field measurement. Based on the change rule of the natural environment temperature, the action spectrum of the natural environment temperature was modeled by segmentation fitting method. The response spectrum model of concrete was also obtained from the action spectrum of the natural environment temperature and the temperature response of concrete. The rationality and precision of the action spectrum and the response spectrum were verified by testing the temperature rule in the typical weather. The results show that the change rule of the natural environment temperature embodies cyclical fluctuation, the action spectrum model of the natural environment temperature can be used to describe the change rule of the natural environment temperature and its characteristic, and the curve drawn based on the action spectrum model is fitted to the testing results with high precision. At the same time, the response spectrum model of temperature in concrete can be also used to describe its change, and the theoretical curve is perfectly fitted with the testing. Similarity between the action spectrum and the response spectrum manifests as the same cycle, and the differences of them are embodied in the lagged time and the weakened amplitude. |
| Key words: temperature action spectrum response spectrum hysteresis fluctuation |
