Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 17, 2018 - March 18, 2018
Bending rupture occurs at the base of the pier at the time of an earthquake on rigid structural bridge constructed before the 2004 road bridge specification manual’s addition of earthquake resistant knitting. The shear buckling phenomenon, due to shear deformation, was confirmed in the abdominal plate at the central part of the beam. This made it impossible to absorb earthquake energy in the direction perpendicular to the bridge axis at the time of the earthquake and it became difficult to recover due to the destruction of the base. In recent years, with the improvement of analytical techniques, it has been proposed to reduce low yield / high ductility material to the abdominal plate in the center part of the beam. More techniques for improving earthquake resistance in the direction perpendicular to the bridge axis are also developing. But, if shear buckling occurs in the failsafe portion, the energy absorption performance of the failsafe portion deteriorates, leading to bending failure of the base portion and destruction unexpected. For this reason, seismic retrofitting at the central part of the beam along the road bridge specification book is currently underway. It is believed that by reinforcing the abdominal plate by increasing the number of horizontal stiffeners, more than the vertical stiffening plates, the number of small material pieces is reduced and the workability at the site improves. Therefore, the performance of non-reinforcement, cruciform reinforcement and horizontal reinforcement is carefully examined and qualitative evaluation on shear buckling is carried out.
