摘要
To alleviate deck fatigue failure and regular pavement damage,which are congenital deficiencies of highway steel bridge deck structure,this paper proposes a newtype of composite bridge deck,consisting of steel tubular connectors and steel-reactive powder concrete (RPC). Push-out tests were conducted to study the newdeck's shear performance. During the experimental process,specimens were divided into two groups which are composed of steel tubular connectors with or without penetrative bars set in. Then,researchers analyzed destroyed models and mechanisms of the composite structure under shear forces. Results showed that test models in two groups,once destroyed,displayed similar shear fracture,which appeared on the lower margin of the steel tubular wall along the welds. Meanwhile,RPC under the connector,for varied tests,was crushed at the same stage,although the large shear and bending deformation just occurred on connectors with penetrative bars. Additionally,shear capacity of specimens with penetrative bars,compared with the ones without bars,unexpectedly decreased by 20%,but the structural ductility was 1.75 times as much,and the ductility coefficients of specimens were all larger than 3.5,demonstrating certain deformation capacity.
To alleviate deck fatigue failure and regular pavement damage, which are congenital deficiencies of highway steel bridge deck structure, this paper proposes a new type of composite bridge deck, consistingof steel tubular connectors and steel-reactive powder concrete （RPC）. Push-out tests were conducted to studythe new deck＇s shear performance. During the experimental process, specimens were divided into two groups which are composed of steel tubular connectors with or without penetrative bars set in. Then, researchers analyzed destroyed models and mechanisms of the composite structure under shear forces. Results showed that test models in two groups, once destroyed, displayed similar shear fracture, which appeared on the lowermargin of the steel tubular wall along the welds. Meanwhile, RPC under the connector, for varied tests, wascrushed at the same stage, although the large shear and bending deformation just occurred on connectors with penetrative bars. Additionally, shear capacity of specimens with penetrative bars, compared with the ones without bars, unexpectedly decreased by 20%, but the structural ductility was 1.75 times as much, and the ductility coefficients of specimens were all larger than 3.5, demonstrating certain deformation capacity.
基金
Sponsored by the National Natural Science Foundation of China(Grant No.51478120)
