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Hideyuki Kasano,Teruhiko Yoda,Kuniei Nogami,Jun Murakoshi,Naoki Toyama,Mamoru Sawada,Kentaro Arimura,Lu Guo 한국강구조학회 2012 International Journal of Steel Structures Vol.12 No.3
Tension and shear block failure is a limit state which occurs in the connection of tension steel members. The failure mechanism is a combination of tensile failure on one plane and shear failure on the perpendicular plane. The design strength equations for the tension and shear block failure are described in the well known design codes. However, they provide inconsistent levels of safety when they are used in different types of connections. In this paper, the authors survey the design strength equations in the various codes. Then, the pertinent strength equations for the gusset plates of steel truss bridges are selected. Moreover, the authors propose a pair of strength equations for compression and shear block failure for gusset plates subjected to compressive force. And to examine the applicability of proposed equations and to investigate the mechanical behavior of compression gusset plates, parametric analyses on the various thicknesses of gusset plates were conducted.
Tomoki Katayama,Jun Murakoshi,Kuniei Nogami,Yusuke Kishi 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.6
Existing steel girder bridges have often suff ered damage at the girder ends during large-scale earthquakes. Against such damage cases, experimental and analytical studies on the failure behavior of steel girder end under lateral force have been carried out so far. However, there are still few study cases focusing on the three-dimensional behavior and load-carrying capacity of the whole superstructure system. In this paper, pushover analyses with nonlinear fi nite element models were performed for a composite steel I-girder bridge in order to investigate the damage mechanism and load-carrying capacity at the girder end under seismic lateral force in the longitudinal and transverse direction. In addition, parametric studies on the eff ect of additional reinforcing ribs at the pin support area on the load-carrying capacity was conducted. Pushover analyses clarifi ed the damage behavior at the girder ends, including the plasticization and deformation process of each steel component, and also revealed that the load-carrying capacity in the transverse direction is smaller than that in the longitudinal direction. It was found that reinforcing ribs provide a resistance function against lateral forces not only in the longitudinal direction but also in the transverse direction and improve the load-carrying capacity.