To　investigate　the　seismic　performance　of　hollow　reinforced　concrete　(RC)　bridge　columns　of　rectangular　cross　section　under　constant　axial　load　and　cyclically　biaxial　bending,　five　specimens　were　tested.　A　parametric　study　is　carried　out　for　different　axial　load　ratios,　longitudinal　reinforcement　ratios　and　lateral　reinforcement　ratios.　The　experimental　results　showed　that　all　tested　specimens　failed　in　the　flexural　failure　mode　and　their　ultimate　performance　was　dominated　by　flexural　capacity,　which　is　represented　by　the　rupture/buckling　of　tensile　longitudinal　rebars　at　the　bottom　of　the　bridge　columns.　Biaxial　force　and　displacement　hysteresis　loops　showed　significant　stiffness　and　strength　degradations,　and　the　pinching　effect　and　coupling　interaction　effect　of　both　directions　severely　decrease　the　structural　seismic　resistance.　However,　the　measured　ductility　coefficient　varying　from　3.5　to　5.7　and　the　equivalent　viscous　damping　ratio　varying　from　0.19　and　0.26　can　meet　the　requirements　of　the　seismic　design.　The　hollow　RC　rectangular　bridge　columns　with　configurations　of　lateral　reinforcement　in　this　study　have　excellent　performance　under　bidirectional　earthquake　excitations,　and　may　be　considered　as　a　substitute　for　current　hollow　RC　rectangular　section　configurations　described　in　the　Guideline　for　Seismic　Design　of　Highway　Bridges　(JTG/T　B02-01-2008).　The　length　of　the　plastic　hinge　region　was　found　to　approach　one　sixth　of　the　hollow　RC　rectangular　bridge　column　height　for　all　specimen　columns,　and　it　was　much　less　than　those　specified　in　the　current　JTG/T.　Thus,　the　length　of　the　plastic　hinge　region　is　more　concentrated　for　RC　rectangular　hollow　bridge　columns.