摘要
为研究冻融损伤混凝土再生砖砌体的抗震性能的影响,对再生混凝土砖墙体进行了冻融循环试验,分析了未受冻融循环试件与冻融循环试件墙体的承载力、刚度退化、延性、耗能。结果表明,经冻融循环作用后,再生混凝土砖墙体的破坏方式主要表现为较早出现初裂缝,且发展迅速,主斜裂缝伴有较多微裂缝,破坏程度相对严重。随着试件冻融循环次数的增加,试件的滞回曲线出现明显捏拢现象,墙体的刚度、耗能、斜向拉伸变形均出现不同程度的下降。在135次冻融循环时,初始刚度降低约39.2%,累计耗能降低68.1%,斜向拉伸变形下降74.1%。
The recycled concrete brick wall by freezing and thawing cycle test,in order to study the freezing and thawing damage of recycled concrete influence on the seismic performance of brick masonry, analysis of the no freeze-thaw cycle test piece and freeze-thaw cycling test pieces of the wall bearing capacity, stiffness degradation, ductility and energy dissipation.The results show that the specimens of freeze-thaw cycle test results show that, recycled concrete brick wall after freezing and thawing cycles of failure mode mainly for cracks appeared earlier, and rapid development, main diagonal cracks associated with many micro fractures, destruction degree is relatively serious.With the increase of the number of freeze-thaw cycles, the hysteresis curve of the specimen appeared obviously, and the stiffness, energy dissipation,and the oblique tensile deformation of the wall all decreased to different degrees.In the 135 times freeze-thaw cycles, the initial stiffness is reduced by about 39.2% ,the cumulative energy consumption is reduced by 68.1% ,and the oblique tensile deformation is decreased by 74.1%.
出处
《混凝土》
CAS
北大核心
2017年第1期117-119,124,共4页
Concrete
关键词
冻融
混凝土
生砖砌体
抗震性能
freezing and thawing
concrete
brick masonry
seismic performance
