In　order　to　solve　the　problems　of　weak　lateral　resistance　and　inadequate　seismic　defense　of　traditional　air　condenser　bracket　structures,　two　air-cooled　bent　frame　specimens　were　designed　and　manufactured.　One　was　consisting　of　two　concrete　pipe　columns　with　conventional　diameter,　the　other　was　consisting　of　two　pipe　columns　with　minor　diameter　and　a　multi-segment-connected　buckling-restrained　brace　(BRB).　The　seismic　tests　of　two　bent　structures　under　cyclic　loading　were　carried　out,　and　the　seismic　performance　was　compared　and　analyzed,　including　the　cracking　state　and　its　development　process　of　pipe　columns,　horizontal　force-lateral　displacement　hysteresis　curves,　stiffness　degradation,　skeleton　curves　and　so　on.　The　characteristics　of　the　axial　force　and　deformation　hysteresis　curves　of　the　single　diagonal　BRB　and　the　working　mechanism　improving　the　seismic　performance　were　studied.　The　tests　prove　that　the　BRB　starts　yielding　to　dissipate　seismic　energy　when　the　lateral　displacement　angle　is　about　1/750,　and　it　does　not　fail　until　the　angle　reaches　about　1/30,　which　increases　the　structural　damping　and　stablizes　the　energy　dissipation,　the　earthquake-resistant　capability　is　increased　significantly.　©　2021,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.