2021 Volume 31 Issue 1 Pages 5-16
Mechanism of generating hydrodynamic pressure due to the motion of gate and dam body has never been elucidated, and the hydrodynamic pressure on crest gate of concrete gravity dam during earthquake has never been observed. For this reason, we observed hydrodynamic pressure on crest gate during earthquake and analyzed them. In this study, we first carried out a 3D finite element model analysis and reproduced the seismic response of the hydrodynamic pressure on the gate. Secondly, we changed specifications of 3D finite element model to evaluate a sensitivity of response of hydrodynamic pressure. As a result, we elucidated the following two points. The first is that the generation of hydrodynamic pressure on the gate is mainly due to gate vibration, at many common gates. The other is the relationship between gate setback ratio, gate span ratio and the hydrodynamic pressure on gate generated by gate vibration.
