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Firedevelopedatapartiallycomplete14levelmultistorybuilding.Afiregrewwithtemperaturesestimatedataround1000°Candalthoughstructuralsteelisestimatedtobecomeelasticataround600°Chowever,somestructuralbeamsweredeformedbutnostructuralfailureoccurredandtheintegrityofthefloorslabsweremaintained(constructedusinglong-spanlatticetrussesandbeamssupportingconcreteslabs)throughoutthefire.Thebuildingconstructionwasnotcompletedthereforecontainednopassivefire-protectiononthesteelwork.Thesprinklersystems&otheractivemeasureswerenotyetcommissionedandnotinoperation.Followingthefire,itwasobservedthatnoconnectionshadfailed.However,thereweredeformationsofboltholes,brokenboltheads,andsomeoftheconnectionplateshadfracturedalongthelengthoftheirbeamsbuthadstillmanagedtotransfershearappropriately,variouslevelsofdeformationobservedinsupportstructures,thosedeformations wereduetotensileforcesinducedduringcooling.Theestimatedcostofdamagewasaround£25m
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Structuralanalysisfollowingthefireprovedthatfireprotectionforstructuralelementsareoverspecifiedandarenotrequiredasmuchasoncethought,fire-engineeringprinciplescanbeappliedtoreducethecostoffireprotectionandthereforecostofconstruction.
Thisbecameacatalystforsteelcompaniestocarryoutresearchinordertogainaneconomicalbenefitwhichhasshownthattheinherentfireresistanceofthiscommonstructuralframingsystemisfargreaterthanisdemonstratedusingstandardfiretests.
IntheCardingtonlargescalefiretestsitwasshownthatunprotectedbeamswhichwouldfailwithin20minutesforasimplysupportedstructureusingastandardfiretestcouldinfactsurviveofferingoveronehourfireresistance.Thisfindingnowunderpinsmuchofmodernstructuralfireengineering
Broadgate,London1990
EventStatistics
Unknown
LessonsLearned
Durationoffire
Numberofcasualties
Costtoindustry
References
None
£25million
BroadgateInvestigation.1990.[Online].[Accessed31October2014].http://www.mace.manchester.ac.ukProf.Andwers.Broadgateincident.FireExplosionPrediction&Investigation,October,2014,WeetwoodHallLeeds.
TypeoffireConstructionFire
UnknownIgnitionSource