Concrete structures in extremely cryogenic environments may be subject to dynamic loadings as a result of occasional accidents or terrorist attacks during the service life. Considering the cryogenic temperature effect and strain rate effect of each phase for concrete, a meso-scale numerical model of the concrete subjected to cryogenic temperature and dynamic loadings was presented in this study, which serves as a preliminary foundation for calculating and evaluating the performances of concrete structures at cryogenic temperature. Taking concrete cube as an example, the dynamic compressive behavior and strain rate effect of concrete specimens at cryogenic temperature from 20 °C to –160 °C were modelled and investigated. The numerical results indicate that the failure appearances and compressive strength are highly related to the cryogenic temperature and dynamic loadings. The compressive strength at cryogenic temperature is greater than that at ambient temperature, and the sensitivity of dynamic compressive strength to strain rate is enhanced at cryogenic temperature. Moreover, the absorbed energy and dynamic elastic modulus tend to increase with the decrease of temperature and increase of strain rate. According to the numerical results, an empirical formula on dynamic increase factor of compressive strength at cryogenic temperatures (CDIF_T) was established.

极低温环境中的混凝土结构在使用寿命期间可能会因偶发事故或恐怖袭击而受到动态载荷。考虑到混凝土各相的低温温度效应和应变率效应，本文建立了混凝土低温动态荷载作用下的中尺度数值模型，为计算和评价混凝土性能提供了初步依据。低温下的混凝土结构。以混凝土立方体为例，对混凝土试件在20°C至–160°C的低温下的动态压缩行为和应变率效应进行建模研究。数值结果表明，失效外观和抗压强度与低温温度和动态载荷高度相关。低温下的抗压强度大于常温下的抗压强度，并且在低温下动态抗压强度对应变率的敏感性增强。此外，随着温度的降低和应变速率的增加，吸收能量和动态弹性模量也有增加的趋势。根据数值结果，建立了低温抗压强度动态增加因子的经验公式（CDIF 此外，随着温度的降低和应变速率的增加，吸收能量和动态弹性模量也有增加的趋势。根据数值结果，建立了低温抗压强度动态增加因子的经验公式（CDIF 此外，随着温度的降低和应变速率的增加，吸收能量和动态弹性模量也有增加的趋势。根据数值结果，建立了低温抗压强度动态增加因子的经验公式（CDIF_T ) 成立。