Precast　segmental　bridge　columns　are　commonly　used　but　merely　in　low-seismicity　areas,　since　their　seismic　performance　is　not　clear　under　actual　earthquake　motions.　To　evaluate　the　feasibility　of　precast　segmental　columns　in　high-seismicity　areas,　it　is　necessary　to　investigate　the　dynamic　behavior　of　such　columns　under　bidirectional　seismic　excitation　owing　to　multi-dimension　characteristics　of　earthquake　ground　motions.　Two　1/　10-scaled　columns　with　continuous　low-carbonated　rebars　between　segments　were　designed　and　reinforced　with　ultra-high-performance　concrete　(UHPC)　based　on　a　proposed　design　method.　Then,　shake　table　tests　of　reinforced　columns　were　conducted　to　investigate　the　influence　of　types　of　seismic　motions　(near-filed　and　far-field)　and　loading　direction　(unidirectional　and　bidirectional)　on　dynamic　responses　of　precast　columns.　The　experimental　results　showed　that　minor　concrete　damage　occurred　in　the　bottom　segment,　and　0.2　%　residual　displacement　was　found,　which　indicated　the　column　had　an　excellent　re-centering　capacity.　Compared　with　the　column　under　unidirectional　seismic　excitation,　the　column　subjected　to　bidirectional　seismic　excitations　had　more　serious　concrete　damage,　more　obvious　fundamental　frequency　reduction,　and　larger　displacement　responses　at　the　column　top,　residual　displacement,　and　peak　stress　of　tendons.　The　displacement　of　the　column　top　under　bidirectional　loads　was　twice　that　under　unidirectional　loads.　In　addition,　the　response　of　the　column　under　near-field　earthquake　motions　was　more　significant　than　that　of　the　column　under　far-field　seismic　excitations.