民國88年921集集大地震發生之後，建築結構之耐震能力評估便成為國內土木界一項重大工作。而側推分析時所採用之地震力豎向分佈及容量譜法對建築結構耐震能力評估結果影響甚大，為此，本論文特別針對建築結構耐震能力評估之地震力分佈與容量譜法進行深入探討。 本論文以六樓平立面規則與平立面不規則中低層鋼筋混凝土建築結構為例，先以ETABS 軟體，進行結構耐震分析及配筋設計，再以ETABS 軟體，利用側推分析法進行耐震能力評估，並比較在彈性階段不同地震力豎向分佈模式對中低層建築結構之影響，以及不同地震力豎向分佈模式與容量譜法對結構耐震能力評估結果之影響，藉以確認不同地震力豎向分佈模式與不同容量譜法之適用性。 研究結果顯示，在平立面規則結構與立面不規則結構中，指數型分佈模式之分析結果與規範型較接近；平面不規則結構則是以指數型與多振型分解模式較為接近規範型，另外，修正型容量譜法可獲得較準確之耐震能力評估結果。本論文之研究成果可供工程實務界及學術界參酌引用。 After the 921 Jiji earthquake took place in 1999,the seismic capacity assessment of buildings structure has become a major task of the domestic civil sector. The vertical distribution of seismic force and capacity spectrum method adopted during pushover analysis will lead to significant impacts on the seismic capacity assessment results of buildings structure. Therefore, in this dissertation an in-depth investigation has been carried out with respect to the seismic force distribution and capacity-spectrum method for seismic capacity assessment of buildings structure. In this dissertation the six-story mid-to-low-rise reinforced concrete buildings structure with regular and plane or vertival irregular are used as examples. First the ETABS is used for structural seismic analysis and reinforcement design, and then it is used to carry out seismic capacity assessment based on pushover analysis method. The comparisons will be made with respect to the impacts of various seismic force vertical distribution modes on mid-to-low-rise building structures at elastic stage, and the impacts of various seismic force vertical distribution modes and capacity spectrum methods on structural seismic assessment result in order to confirm the applicability of various seismic force vertical distribution modes and various capacity spectrum methods. The results of this study indicate that the analysis result of exponential distribution mode is more similar to the results of code distribution mode among plane regular structures and vertical irregular structures; among plane irregular structures the exponential mode and multi-modal decomposition mode are more similar to the code distribution mode. In addition, the modified capacity spectrum can lead to more accurate seismic assessment results. The research results in this dissertation are available for engineering practice sector and academic sector as future references.