STABILITY OF CASSETTE PONTOON BRIDGE UNIT SUBJECTED BY UNDERWATER SHOCK WAVE

摘要

A new idea of a cassette pontoon bridge unit withrnadjustable load capacity is presented. A single unit ofrnbridge is partially immersed in water. Since the mainrncarrying part of the bridge is an air cushion filled withrnair, stability of the unit is important as it buoyancy fromrnthe point of view of its usefulness. In the paper, initialrnsimulations developed with use of Ls-Dyna software arerndescribed. The effect of gas-tight chamber numbers of thernair cushion on the stability of the unit bridge isrnconsidered. The simulation of the underwater detonationrnis provided with use of the Finite Element Method (FEM).rnDisplacements of the roadway surface of the cassetternpontoon bridge due to an underwater shock wave arerndetermined also.