Existing　reinforced　concrete　frame　buildings　designed　for　vertical　loads　could　only　suffer　severe　damage　during　earthquakes.　In　recent　years,　many　research　activities　were　undertaken　to　develop　a　reliable　and　practical　analysis　procedure　to　identify　the　safety　level　of　existing　structures.　The　Incremental　Dynamic　Analysis　(IDA)　is　considered　to　be　one　of　the　most　accurate　methods　to　estimate　the　seismic　demand　and　capacity　of　structures.　However,　the　executions　of　many　nonlinear　response　history　analyses　(NL_RHA)　are　required　to　describe　the　entire　range　of　structural　response.　The　research　discussed　in　this　paper　deals　with　the　proposal　of　an　efficient　Incremental　Modal　Pushover　Analysis　(IMPA)　to　obtain　capacity　curves　by　replacing　the　nonlinear　response　history　analysis　of　the　IDA　procedure　with　Modal　Pushover　Analysis　(MPA).　Firstly,　In　this　work,　the　MPA　is　examined　and　extended　to　three-dimensional　asymmetric　structures　and　then　it　is　incorporated　into　the　proposed　procedure　(IMPA)　to　estimate　the　structure＇s　seismic　response　and　capacity　for　given　seismic　actions.　This　new　procedure,　which　accounts　for　higher　mode　effects,　does　not　require　the　execution　of　complex　NL-RHA,　but　only　a　series　of　nonlinear　static　analysis.　Finally,　the　extended　MPA　and　IMPA　were　applied　to　an　existing　irregular　framed　building.