The Seismic Analysis of Diagrid Structures in Various Seismic Zones of India, Considering Both Soft and Hard Soil Conditions

Improving high-rise buildings involves a myriad of complex factors, including finance, aesthetics, technology, urban regulations, and politics. However, among these factors, finance has emerged as the primary governing element. In tall structures, the structural design is largely governed by its lateral stability. In this context, diagrid structures have demonstrated their ability to efficiently withstand lateral seismic loads through their unique corner-to-corner connectivity, which sets them apart from conventional orthogonal structures like framed tubes. Diagrid structures offer exceptional structural efficiency while also introducing new aesthetic possibilities in tall building architecture. Their distinctive appearance is easily recognizable and visually appealing. By minimizing the need for vertical columns on the facade, diagrid systems reduce obstructions to the external view, enhancing the overall visual impact. Moreover, the efficiency of the diagrid system allows for the elimination of interior and corner columns, providing significant flexibility in floor planning. In this study, we conducted a comparative analysis to examine the positive impact of diagrid structures on tall buildings. Our objective was to evaluate the enhancement of resistivity and compare the variations in forces between a bare frame and a diagrid frame subjected to seismic forces in different zones and soil types. The study focused on a G+11 structure, considering the relevant loadings as per Indian provisions and seismic zones III and V. For modeling and analysis, we utilized the STAAD.Pro V8i software tool. A total of eight different cases were considered, incorporating diagrid structures at a diagonal angle of 63 degrees. The aim was to compare these cases and determine the most effective design approach for resisting forces.