抄録
In order to secure the safety of a bridge against tsunami, it is important to examine the tsunami external force acting on a bridge section. This paper describes the effect of the hydrodynamic forces caused by tsunami. The bridge section models in this paper are rectangle, trapezoid, upside down trapezoid and rectangle which has center opening section. The trapezoid section model had smaller horizontal tsunami force. The center opening section model had almost no vertical tsunami force. The relation between the depth of tsunami and the tsunami force coefficients was provided through the force measurement.
