【作者】 成煜； 谢剑； 严加宝；

【Author】 CHENG Yu;XIE Jian;YAN Jia-Bao;School of Civil Engineering,Tianjin University;Key Laboratory of Coast Civil Structure Safety,Ministry of Education,Tianjin University;

【机构】 天津大学建筑工程学院； 天津大学滨海土木工程结构与安全教育部重点实验室；

【摘要】 为研究混凝土结构在超低温下的受力性能,借助超低温冷库和超低温环境箱等降温-保冷装置,对超低温下钢筋混凝土梁、有黏结及无黏结预应力混凝土梁进行受弯性能试验研究和有限元分析。得到以下主要结论:在低温条件下混凝土梁的平截面假定仍然适用;低温下混凝土梁的承载力和刚度有一定的提高,但是脆性增大;通过有限元分析得到的结果与试验数据较吻合,表明所采用的低温环境下钢筋和混凝土的材料性能是合理的。更多还原

【Abstract】 To study the behavior of concrete structures at low temperatures, with the help of cold-insulation equipments, such as cryogenic freezer and environmental cryogenic box etc, the flexural behavior of reinforced concrete beams、bonded and unboned prestressed concrete beams were carried out by a series of experiments and the finite element analysis. Some main conclusions can be drawed: The plane section assumption for the concrete beams under bending still worked; Load carrying capacities and stiffness of concrete beams increased at low temperatures, but the concrete beams became more brittle; Results of finite element analysis were similar to that of the experiments, which showed that the material model for concrete and steel reinforcements at low temperature used were reasonable.更多还原