RESEARCH ON DAMAGE CHARACTERISTICS AND PROTECTIVESTRUCTURE DESIGN OF STEEL PONTOONS UNDER NEAR-FIELDEXPLOSION LOAD

[摘要] The focus of this paper is to investigate the damage characteristics and protectivestructure design of pontoons as an important barrier for the protection of ports. Two types ofprotective measures of pontoons are investigated：filling tanks with water and installingsprings in tanks. In this paper, the damage characteristics of two types of pontoon sidestructures under the action of near-field explosion loads are simulated by using LS-DYNAexplicit dynamic analysis software and the ALE algorithm. According to the numericalexperiment results for filling different volumes of water in the side tanks, the volume of waterfor the minimum deformation of the shell plate is 100%, and for the first longitudinalbulkhead, it is 30-40%. Moreover, by applying weights to their deformations based on theactual explosion-proof performance requirements of the shell plate and the first longitudinalbulkhead, the pontoon side structure with the best explosion-proof performance can beobtained. The plastic deformation of the pontoon structure equipped with different types ofsprings is an order of magnitude smaller than that of the ordinary structure and of the pontoonstructure filled with a water medium in the positive tanks. The explosive shock wave energyabsorbed by the pontoon is effectively reduced by the addition of water or springs to theprotective tanks. The minimum energy absorbed by the pontoon structure with water added inthe protective tanks is 18.31% of the energy absorbed by the ordinary structure, and thecorresponding volume ratio of water added in the protective tanks is 100%. The pontoonstructure with springs in the side protection tanks absorbs only 7.2% of the energy absorbedby the ordinary structure. Both new side protection structures have demonstrated excellentexplosion-proof performance.

[学科分类] 工程和技术（综合）

[关键词] Near-field explosion;pontoon;ALE algorithm;structural design;watertank;spring