6、,producethemostunfavorableinternalforcecontrolsection,andsowereReinforcement.Thedesigncalculationofthissubjectincludes:Thesurveyoftheprogram,The selection andarrangement of the structure,Thecalculationofframelateral stiffness, Theinternalforcesanddrift calculationofframestructures under l