RC箱型结构内爆炸载荷特性和动力行为分析

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中图分类号：O389;TU375 国标学科代码：13035 文献标志码：A

Abstract：Inareinforcedconcrete （RC）boxstructure，thedisipationofblast waves isrestricted，anddamagetothestructure canbeitensifiedduetomultiplereflections.Tothoroughlyinvestigatetheloadcharacteristicsanddynamicbehaviorof intermalexplosions inanRCbox structure，theapplicabilityof thefiniteelement methodwas verifiedbyreplicating internal explosion tests on fuly enclosed and semi-enclosed （with venting openings）RC box structures.Based on this， numerical simulations of intermal explosions wereconduted forthe prototypical RC box structure andthe typeof terorist bombing atacksspecifiedbytheFederal Emergency Management Agencyunderthree explosionscenariosand four venting areas.The influence ofventingarea ontheloadcharacteristicsatthe inersurfaces andcomers，theloaddistributiononthe innersurfaces， and thetime historiesof displacementand velocityatthecentersof the innersurfaces under interal explosion loads were explored.Additionall，aformulaforcalculating the total impulseof thestructure'sinnersurface was proposed，considering boththe venting areaand the spatial distribution ofthe impulse.Theresults showthat the venting area hasanegligibleffct ontheoverpressure，while theimpulse decreasesexponentiallywith increasing venting area.Theload distribution characteristicsonthestructure'sinnersurfacearesignificantlyinfluencedbythestructural dimensions，exhibitinganindented or W pattern. The maximum displacement at the centers of walls and slabs is reduced by about 50% as the venting coefficient changes from 0.457to1.20.Finally，basedonthetotal impulseand maximum displacementresponseofeach component under free-field explosion loads，a calculation method for the impulse and damage enhancement coeffcient was proposed basedonthe ventingarea，efectivelypredictingtheinternal explosionloadandthestructure'sdynamic behavioratvarious venting coefficients.

Keywords： internal explosion; RC box structure; load characteristics; dynamic behavior

钢筋混凝土（reinforcedconcrete，RC）箱型结构是构成房屋、枪支弹药库以及地下车站等建筑物结构的基本单元1]。（剩余23724字）