The　Anhai＇ao　Bridge　located　in　Pingtan,　Fujian　is　a　three-span　extradosed　cable-stayed　bridge　with　a　main　span　of　150　m.　For　the　first　time,　its　design　scheme　adopted　a　fan-shape　composite　bridge　tower　composed　of　five　CFST　arched　tower　columns　and　curved　steel　pipes.　In　order　to　study　the　spatial　force　transmission　mechanism　of　this　new　type　of　extradosed　cable-stayed　bridge,　a　1:25　large-scale　model　was　fabricated　and　a　static　loading　test　was　performed.　Combined　with　the　finite　element　analysis　results　of　the　actual　bridge,　the　loading　state　of　the　special-shaped　main　tower,　main　girder,　and　inhaul　cable　under　different　individual　loads　was　discussed.　The　research　results　show　that　under　the　action　of　vehicle　load,　the　CFST　fan-shaped　composite　tower　bears　about　10%　of　the　load　through　the　inhaul　cable,　i.e.,　the　live　load　distribution　ratio　between　the　main　tower　and　the　main　girder　was　maintained　at　1:9.　Compared　with　the　continuous　girder　bridge,　the　maximum　strain　and　mid-span　deflection　of　the　main　girder　of　the　extradosed　cable-stayed　bridge　can　be　reduced　by　about　10%.　As　the　load　level　increased　to　2.0　times　the　equivalent　lane　load,　the　deflection　and　strain　of　the　main　girder,　the　force　increase　of　the　inhaul　cables,　and　the　strain　of　each　tower　column　of　the　main　tower　presented　basically　the　same　linearly　changing　trends.　Under　the　action　of　vehicle　load　or　foundation　settlement,　the　middle　tower　column　and　the　secondary　tower　column　of　the　fan-shaped　composite　tower　bore　most　of　the　load　transmitted　by　the　inhaul　cables　and　their　stress　levels　were　relatively　high,　and　the　side　tower　column　supported　small　force;　the　load　distribution　ratio　of　the　middle　tower　column,　the　secondary　tower　column,　and　the　side　tower　column　was　about　10:10:1;　the　steel　tube　at　the　junction　of　the　curve　section　and　the　straight　section　and　the　bottom　section　of　the　tower　column　were　the　most　unfavorable.　Moreover,　compared　with　the　effects　of　vehicle　load　and　foundation　settlement,　the　CFST　fan-shaped　composite　tower　was　more　sensitive　to　the　temperature　effect,　the　overall　stress　levels　of　each　tower　column　were　equivalent,　and　the　top　section　of　the　tower　column　had　the　highest　stress.　The　above　research　results　can　provide　references　for　subsequent　research　and　design　of　similar　structures.　©　2022,　Editorial　Department　of　Journal　of　Hunan　University.　All　right　reserved.