温度对混凝土结构力学性能影响的研究进展

混凝土材料因为性能优异、取材广泛,应用范围不断扩展。火灾高温、高纬度和极地严寒环境以及液化天然气储罐等情形使得混凝土结构所承受的温度跨越1000℃左右的高温到-165℃的低温。因此,为保证工程结构在不同环境中的安全性,需要充分了解掌握温度对混凝土材料及结构性能影响。长期以来,研究者针对不同温度下混凝土结构的性能,开展大量研究工作,形成较为系统的理论体系和设计方法。文中梳理了高温对普通混凝土、钢纤维混凝土和钢筋材料性能及构件力学性能影响的研究成果,介绍了混凝土、钢筋和钢筋混凝土构件低温性能的研究进展,从高性能混凝土材料和构件高温性能、混凝土结构抗火设计方法、受火混凝土结构损伤评估与加固、混凝土材料低温力学性能和损伤机理以及构件行为等方面指出研究工作发展趋势。

Research progress on the influence of temperature on the #br#mechanical performance of concrete structures

The application scope of concrete material is continuously expanding because of the excellent performance and wide selection of raw materials. The environmental temperature of the concrete structures ranges from a high temperature of about 1000 ℃ to a low temperature of -165 ℃ in the cases of fire disaster, high latitude and extreme cold environment, as well as the LNG storage tank, etc. Therefore, it is essential to fully understand the influence of temperature on concrete materials and structural properties to guarantee the safety of engineering structure in different environments. A lot of research work has been carried out on the performance of concrete structures at different temperatures while the relatively systematic theoretical system and design method have been formed. In this paper, the research work of the effect of high temperature on the mechanical properties of ordinary concrete, steel fiber reinforced concrete and steel rebar as well as reinforced concrete (RC) components was concluded and the research progress of concrete, steel rebar and RC components at cryogenic temperature was introduced. Then, the research trend was pointed from five respects, namely, the high-temperature properties of high-performance concrete, fire-resistant design methods of concrete structures, damage assessment and retrofitting of fired concrete structures, low-temperature properties of concrete materials and damage mechanism, as well as the behavior of RC structures subjected to cryogenic temperature.