接触爆炸条件下聚脲涂层对RC基板 层裂和贯穿的影响

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中图分类号：0383 国标学科代码：13035 文献标志码：A

Abstract： In recent years， polyurea-coated reinforced concrete （RC）slabs have been extensively studied both experimentally andnumericallforstructural strengtheningagainstcontactexplosions.However，theoretical investigationsremainlimited， particularlyconcerming the impactof polyurea onthe local damages of theRCsubstrates.Inthis paper，ananalytical model based onstress wave propagationtheory was proposed to investigate thereflectionofcompression waves atthe backsideof the RCsubstrateslabandpredictthespalingdepth.Utilizingthisanalytical model，aquantitativeanddetaileddiscussion was presentedregarding the effectof the polyurea on thecritical spalingand breachoftheRCsubstrate slab.Furthermore，the applicabilityof the empirical breach prediction，originally developed foruncoated RCslabs，wasvalidated through existing experiments to predict thebreach of polyurea-coatedRCsubstrate slabs.Theresults indicate thatpolyurea affects the spalling processof theRCsubstrate slabs.Specifically，te net stress wave adjacent totheconcrete-polyurea interface isacompression wave，whileittransitionstoatensilewaveinthedeeperconcrete.PolyureaprimarilyimpactsthfrstspalloftheRCsubstrate slab;subsequentspalingprocessesafterthfirstspallalignwiththoseobservedinuncoatedRCsabs.Upontheoccurrenceof criticalspalling，polyureaenhances tecritical spallingresistanceofRCslabs，although itsignificantlyincreases thespaing depth. Conversely， whena breach occurs，polyurea reduces the number ofspallsbut minimally afects on the total spaling depth.Basedonthesefindings，the empirical method forpredicting breachesofuncoatedRCslabscaneffectivelybeapplied to predictthe breach of RC substrate slabs coated with polyurea.The test results from more than twenty contact explosion experiments areconsistent with thepredictedoutcomes，therebyvalidating theefectiveness of theanalytical model and providing a method for estimating the breach of polyurea-coated RC substrate slabs.

Keywords：ontact explosion;reinforced concrete slab;polyurea coating;anti-blast performance;analyticalmodel;spall; breach

接触爆炸条件下钢筋混凝土（reinforced concrete，RC）板以局部破坏为主，破坏模式包括正面压缩坑、背面层裂坑和贯穿等[12]，并产生大量混凝土破片。（剩余22405字）