钢纤维增强多孔混凝土板水下接触爆炸 防爆机理及损伤等级预测

中图分类号：O383;TJ55 国标学科代码：13035 文献标志码：A

Abstract：Inordertoexploretheunderwateranti-explosionprotectioneffectofsteelfiberreinforcedcelllarconcrete materials，the damage processofreinforced concrete slabs under underwater contact explosion was reproduced by thecoupling methodof smothed particle hydrodynamics andfiniteelement method （SPH-FEM）.The validityof the simulation method wasverifiedbycomparing withthe experimentalresults.Onthis basis，athre-dimensionalrefinedsimulationmodelofwaterexplosive-protective layer-reinforced concrete slab was established bythe SPH-FEMcoupling method.Thedamage evolution process failure mode and failure mechanism of protective layer of steel fiber reinforced celular concrete （SAP10S5，

SAPI0S10，SAPoS15andSAPoS20）withdiferentfiberratiosandexplosive mass werestudied，andthepredictionurveof damage level of reinforced concrete slabs was constructed.The results show that the numerical simulation results are in good agrement withthe experimentalresults，whichverifies theeffectivenessofthe simulation method.Undertheunderwater contactexplosion，theadditionof protectivelayerofsteel fiberreinforcedcelularconcretecaneffectivelyreducethedamage degree of protected reinforced concrete （RC）slab，and its influence on the damage degreeofRC slab decreases firstandthen increaseswith the increaseof steel fiber volume fraction inthe protective layer.Among them，theanti-explosion protection efect of protective layerofSAPloS15ratio isthebest.When the amount of explosive increases withinacertainrange，the protective layer of SAPloS15 ratio can still maintain a high proportion of energy consumption and efectively reduce the damage degree of the RC plate. When the amount of explosive is ，thedamage index ofRC slabs strengthened with protective layer of SAPloS15 has the most obvious attenuation compared with the unprotected scheme， which is 4 2 . 5 % and the damage level is reduced from serious damage to moderate damage.The prediction curve ofconstructed damage level can directly evaluate the influence of steel fiber volume fraction/explosiveamount on the damage degreeofRC panel.The above research results can provide reference for the anti-explosion protection design of wading concrete structures.

Keywords：underwatercontactexplosion；steelfiberreinforcedcelularconcreteslab；failure mode；damage levelprediction

近年来国际局势动荡不安，爆炸和恐怖袭击等事件愈发频繁。（剩余21210字）