In order to find out the characteristic of force impacting on bridge girder, the steady flow combined with solitary wave experiment was carried out with a bridge girder model. As a result of the standard case (prototype: 7m/s-steady flow, 5m-solitary wave), the measured maximum horizontal force of steady flow combined with solitary wave on bridge girder by force transducer becomes 3.4 times to the measured horizontal force of the case only using steady flow. Besides, measured maximum vertical force of steady flow combined with solitary wave is slight with a uplift force of 1.3N on bridge girder, because the vertical force of the case only using steady flow is a strong downward force of -28.7N.
