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冻融作用谱模型应由年平均冻融循环次数和不同冻结温度的冻融循环发生概率分布两者组成。从结构全寿命设计需求考虑,依据全国130余个气象站点1951-2010年的温度数据,对我国冻融循环的发生概率分布进行分析。以日最高温度高于0℃,最低温度低于-3℃为冻融循环发生条件,选用(左)半边正态分布对哈尔滨地区温度数据进行分析,编制该地区的冻融作用谱,同时利用北京、呼和浩特、伊宁和郑州等典型地区的气象数据检验半边正态分布的适用性;最后给出我国主要地区的冻融作用谱参数,并对混凝土结构的冻融损伤预测进行举例分析。结果表明:我国绝大多数地区的冻融作用谱都能用半边正态分布表示;所提方法能够清楚描述我国各地区冻融作用的实际强弱情况,也可直接为进行结构全寿命期的性能退化预测提供所需的冻融作用参数。
The freeze-thaw profile model should be composed of the annual average number of freeze-thaw cycles and the probability distribution of freeze-thaw cycles with different freezing temperatures. Considering the demand of life-span design, the probability distribution of freeze-thaw cycles in China is analyzed based on the temperature data of 130 stations in China from 1951 to 2010. The daily maximum temperature above 0 ℃, the minimum temperature below -3 ℃ for the freeze-thaw cycle conditions, the selection of (left) normal distribution of the half of Harbin temperature data analysis, preparation of the region freeze-thaw spectrum, while using Beijing, Hohhot, Yining, Zhengzhou and other typical areas of the meteorological data to verify the applicability of the half-normal distribution; finally given the main regions of China’s freeze-thaw spectral parameters, and concrete structure freeze-thaw damage prediction for example. The results show that most of the regions in China can be represented by the half-normal distribution of the freeze-thaw spectrum; the proposed method can clearly describe the actual strength and weakness of the freeze-thaw function in different regions of China, Performance degradation prediction provides the required freeze-thaw parameters.