摘要：The ma.n concern of this pa.er is to study the influence of the building slenderness ra.io on the structura. beha.ior of the residentia. concrete ta.l buildings a.ming to deepen structure a.d a.chitect designers understa.ding for such type of buildings. The study is empha.ized only on Kuwa.t city design conditions for wind a.d seismic loa.ings. The pa.er presents a. a.tua. ca.e study for a.ding two thirty stories residentia. towers with two different slenderness ra.ios to a. existing residentia. complex. Wind loa.ing is considered using both code va.ues a.d wind tunnel results. Three dimensiona. finite element techniques through ETa.S softwa.e a.e used in conducting a.a.ysis for structures presented here. a.servicea.ility study is performed to ensure tha. buildings ha.e sufficient sta.ility to limit la.era. drift a.d pea. a.celera.ion within the a.cepta.le ra.ge of occupa.cy comfort. In a.dition, a. ultima.e strength study is ca.ried out to verify tha. a.l the structura. elements a.e designed to withsta.d fa.tored gra.ity a.d la.era. loa.s in a.sa.e ma.ner a.cording to the interna.iona. building codes. a.a.ysis results a.e presented a.d discussed. a.brief idea.a.out founda.ion design of the new towers a.d its connection to the existing founda.ion is presented. Fina.ly conclusions a.e summa.ized a. guidelines for the structura. professions of concrete residentia. ta.l buildings.