|主題||Shear-Fatigue Behavior of Steel-Concrete Sandwich Beams without Web Reinforcement|
|筆頭著者||Mohab Zahran（Hokkaido University）|
|連名者1||Kentaro Kanaya（Hokkaido University）|
|連名者2||Tamon Ueda（Hokkaido University）|
|連名者3||Yoshio Kakuta（Hokkaido University）|
Steel-concrete sandwich member is a type of composite member in which core concrete is sandwiched by steel skin plates as shown in Fig.1. The flexural capacity and also the shear capacity of this type of members have been thoroughly investigated under static loading conditions. Therefore, the design code for steel-concrete sandwich structures has been proposed recently. However, there is a lack of the experimental data regarding the strength of this type of members under fatigue loading conditions. Therefore, this study investigates the shear-fatigue behavior of steel-concrete sandwich beams which are not provided with web reinforcement.
1)The sandwich beam investigated in this study indicates a shear failure mode under static loading, which is characterized by main diagonal cracks. Under fatigue loading, diagonal cracks initiate at the locations of the shear connectors and then the propagation of these cracks increases with increasing the number of loading cycles (N).
2)For large maximum fatigue load (Pmax=95.6% of Pcr), the failure mode is crushing of core concrete between diagonal cracks, but for smaller loads (Pmax=82.6% and 69.6% of Pcr), the failure mode is fracture of the tensile steel plate at the supporting point.
3)The fatigue life for the main diagonal cracking was predicted by using the finite element method in which an experimental S-N relationship was applied to reduce the tensile strength of concrete.