This　paper　studies　the　effect　of　truck　wheel　loadings　on　the　behavior　of　skewed　reinforced　concrete　deck　supported　on　PC　girder　superstructure.　The　research　was　purposed　to　fully　investigate　the　role　of　truck　loadings　in　commonly　observed　corner　cracking　on　skewed　RC　deck.　Finite　element　analysis　(FEA)　was　performed　for　a　series　of　generic　skewed　RC　deck　models　with　varying　key　parameters.　Before　that,　the　FEM　numerical　modeling　was　first　corrected　and　verified　by　use　of　in-situ　deck　strain　measurement　during　field　load　testing　of　a　bridge　named　as　M-50　skewed　at　46°.　Both　the　field　test　and　FEA　results　show　that　service　truck　loadings　induce　very　low　strains　or　stresses　in　the　decks,　which　are　unlikely　to　initiate　the　corner　cracking　alone　on　the　skewed　decks.　However,　the　repeated　truck　wheel　loadings　over　decks　may　create　cracking　or　make　the　existing　cracks　become　wider,　longer　and　even　visible.　In　addition,　the　local　effect　of　wheel　loadings　significantly　contributes　to　the　total　strain　or　stress　response,　especially　for　long　span　bridges　and　at　mid-spans　of　bridges,　but　the　global　loading　effect　of　deck　being　a　part　of　composite　cross　section　may　be　either　negligible　or　significant　depending　on　the　location　investigated.　The　current　AASHTO-LRFD　(2007)　design　method　conservatively　estimates　the　local　effect　but　ignores　the　global　effect,　resulting　in　unsatisfactory　modeling　of　the　real　strain　state.　Besides,　the　total　strain　or　stress　effect　due　to　truck　loading　increases　slightly　with　skew　angle　magnitude.