- 錢春香,王 輝,何智海
2012年第2期
摘要
引用本文
摘 要:為了將實驗室標準條件下測量的數據更好地用于實際橋梁建設和維護中,本文研究了環境相對濕度和試件尺寸對混凝土收縮的影響。研究結果表明,試件的尺寸不僅影響干燥收縮的進程,對干燥收縮終值也有很大的影響,尺寸越小,混凝土干燥收縮越大,混凝土的尺寸效應隨著濕度降低而增加。結合CEB-FIP1978,根據試驗結果修正了CEB-FIP1990收縮模式,修正后的模型計算結果與試驗值的比較表明,按照本文的處理方法可以提高模型預測精度,為將實驗室預測結果較好地推廣到實際結構收縮的預測中提供了一種修正方法。
Abstract: In order to apply the data from laboratory to the structure shrinkage prediction in field, the effects of environment relative humidity and specimen size on concrete shrinkage are studied. The results show that the specimen size not only affects the progress of shrinkage but also the final shrinkage strain. Drying shrinkage increases with smaller specimen size. The size effect is more prominently when the environment relative humidity is lower. Combining with CEB-FIP1978, the CEB-FIP1990 model is improved based on the experiment result, and the calculation value is compared with experiment value. The prediction accuracy is improved remarkably by the improved model, which provides a modified method for the laboratory prediction into practical structure shrinkage prediction.