同济大学学报（自然科学版）2017，Vol.45Issue(7)：962-969,8.DOI:10.11908/j.issn.0253-374x.2017.07.004
高强混凝土新旧结合面抗剪性能试验
Experimental Investigation on Interface of High Strength Concretes Cast at Different Times Under Direct Shear
摘要
Abstract
In this paper,the monotonic direct-shear tests composed of eleven C80 and four C40 concrete push-off specimens were conducted.The failure patterns of specimens,load-slip relation curves,and load-rebar strain relation curves were obtained.The experimental results were analyzed in terms of concrete strength.interface shear rebar strength,and interface types.Afterwards,32 sets abroad results of interface shear capacity were compared with calculated values using relevant standards at home and abroad.It is found that two failure patterns occur,specifically the interface shear failure and concrete punch failure.The load of C80 specimens with rough interfaces at their first peaks are lower than those of C40 specimens.Moreover,the load values of specimens with shear keys are larger than those with rough interfaces,and the load increases with interface rebar strength.The ratio of capacity calculated by JGJ 1 and test results is between 0.33 and 0.72.Compared with MC2010,ACI318 and EN1992,JGJ 1 is more conservative.Based on the test results,regression analysis was finished and a modification suggestion calculation formula aimed at interface between high strength concretes was presented.关键词
新旧混凝土结合面/受剪承载力/推剪试验/高强混凝土/高强钢筋Key words
interface between concretes cast at different times/shear capacity/push-off test/high strength concrete/high strength rebar分类
建筑与水利引用本文复制引用
赵勇,邹仁博..高强混凝土新旧结合面抗剪性能试验[J].同济大学学报（自然科学版）,2017,45(7):962-969,8.基金项目
“十二五”国家科技支撑计划(2011BAJ10B02) （2011BAJ10B02）
