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ASCEPORTS2004Conference
Houston,Texas
SecuringCranesforStormWind:UncertaintiesandRecommendations
PatrickMcCarthy*andFerozeVazifdar**
*PE,Associate,LiftechConsultantsInc.;300LakesideDr.,14thFloor,Oakland,CA
94612;Tel:510-832-5606;pmccarthy@liftech.net
**SE,VicePresident,LiftechConsultantsInc.;fvazifdar@liftech.net
Background
Stormwindisoneofthefewforcesthat,althoughconsideredindocksidecontainer
cranedesign,stillcausessignificantdamage—evencollapse.SeeFigure1.
Dependingonthegeographicregion,largetropicalstormsarecalledtyphoons,
cyclones,orhurricanes,eventhoughthemechanismdrivingthestormsisthesame.
Thispaperreferstoallsuchstormsashurricanes,andalthoughitfocusesprimarily
onthedesignofsystemstosecuredocksidecontainercranesagainsthurricanes,it
alsodiscussesdifferencesinstormwindstowagerequirementsforcranesinregions
notpronetohurricanes.
Inalmosteveryhurricane-relatedcranecollapsethatwehaveinvestigated,
failureinitiatedinthetiedownand/orstowagepinsystems.Severalcranestructures
wehavedesignedhaveexperiencedhurricanesexceedingthedesignwindspeeds,yet
haveperformedwell.Noneoftheover1,000cranesconformingtoourforce
coefficientshavefailedduetoaninitialoverstressintheframestructure.Ofthe
cranefailureswehaveinvestigated,thestowagepinsystemandtiedownwharf
bracket,linkplates,andturnbucklesaretheweaklinks.Infact,thestrengthofthe
tiedownsystemissometimesonlyasmallfractio
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