| 摘要 |
PROBLEM TO BE SOLVED: To prevent a beam from dropping from a bridge pier due to an earthquake by arranging protruded energy dampers having a nearly triangular cross sectional shape at the beam hook section of the bridge pier fitted with the beam via a support body. SOLUTION: A beam 1 is supported on a support body 3, and the beam 1 is mounted and fixed to a beam hook section 2. Protruded energy dampers 7 having a nearly triangular cross sectional shape are integrally molded in a line or multiple lines with tilt faces 2 faced to the support body 3 in the axial direction of the beam hook section 2 and the direction perpendicular to it around the support body 3. When an earthquake occurs and the support body 3 is shear-ruptured, the beam 1 drops. When the beam 1 is further moved by aftershock, the beam 1 is moved upward on the tilt face 6 of an energy damper 7. When the movement proceeds, the beam 1 drops from the energy damper 7. When the movement further proceeds, the beam 1 is moved on the next energy damper 7, thereby earthquake energy is damped. The beam 1 can be prevented from dropping from a bridge pier. |
