Shifferaw, Taye (PhD)Bekalu, Tariku2020-11-182023-11-112020-11-182023-11-112020-10http://etd.aau.edu.et/handle/12345678/23371he current trends of construction industry demand tall and lighter structures. These tall structures are very sensitive to Lateral loads induced by Earthquake, wind or ocean waves than that of the gravitation loads. To resist the lateral loads several techniques are available, out of the several techniques available diagrid structures are found as more structurally efficient over other type of lateral load resisting system in developed countries recently. This type of lateral load resisting system (diagrid) has generated a good interest from architects on aesthetic aspect and structural Engineers by their structural efficiency. Diagrids or diagonal grids are a structural design approach for constructing buildings that combine the resistance to gravity and lateral loads into a triangulated system of members that eliminates the need for vertical columns. If this diagrid system constructed with optimal configuration, the material consumption will efficiently increase. This research paper, base the study on the previous researches and accept the structural efficiency of diagrid structures than the other lateral load resisting system, mainly focused on the seismic performance evaluation of three different stories (G+10, G+16 and G+22) with different diagrid angle (53.13˚, 69.26˚, 75.57˚ & 79.22˚) located in two different ground type (A & C). the results from the twenty-four model cases were compared to verify the structural efficiency with different structural configuration using design response spectrum analysis in ETABS 2016 v16.2.1 software for steel diagrid in reinforced concrete building. The analysis and design of these twenty-four (24) models of diagrid structures followed the basic steps and approaches that are operational and practical in real world. Proposed diagrid structure cases were to be situated in Hawassa, whose seismic zone is categorized under Zone IV according to the ES EN 1998-1:2015 annex D Table. The lateral load analysis of the study has been based on the new code ES EN 1998-1:2015. The analysis has been done using finite element software ETABS 2016 v16.2.1. The performance evaluation of these twenty-four case studies of diagrid buildings is mainly based on linear analysis parameters, such as Fundamental vibration period, story displacement and interstory drift.Based on the model cases considered in this study, Results has showed that Diagrid structure has difference fundamental vibration period, story displacement and inter-story drift based on their module angles considered for each case. From the linear analysis of twenty-four of G+10, G+16 and G+22 story buildings, in ground type A & C with four different module angles, a two story module or module diagrid angle 53.13˚ has shown a smaller top displacement, smaller inter-story drift and smaller fundamental time period for G+10 story building. Whereas module diagrid angle 69.26˚ and 79.22˚ has shown a smaller top displacement, smaller inter-story drift and smaller fundamental time period for G+16 and G+22 story buildings respectively. Therefore, according to the linear analysis results and comparative study of this thesis, it can have concluded that for a better and significantly good performance, finding the optimal module angle with respect to height to width aspect ratio is very recommendable.en-USDiagrid Structure systemModule anglesDesign response spectrum analysisThesis