International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 11 | Nov 2025
p-ISSN: 2395-0072
www.irjet.net
COMPARATIVE STUDY ON DIAGRID STRUCTURE WITH FRAMED STRUCTURE N.M. Lakshmi Prasad1, Dr D.V. Prasada Rao2 1P.G. Student, Department of Civil Engineering, Sri Venkateswara University College of Engineering, Tirupati,
Andhra Pradesh, India.
2Professor,
Department of Civil Engineering, Sri Venkateswara University College of Engineering, Tirupati, Andhra Pradesh, India.
---------------------------------------------------------------------***--------------------------------------------------------------------Abstract - The construction of multi-storey buildings has increased worldwide. With an increase in structure height, the
importance of lateral load-resisting elements becomes more significant. Widely used lateral load resisting systems are moment resisting frames, shear walls, braced systems, outrigger systems, and diagrid systems. Diagrid is an exterior structural system that consists of inclined columns along the periphery. The main aim of this study is to compare the performance of the diagrid structural system with a framed structural system. Comparisons are made for both R.C and steel structures. Structural models are analysed and comparisons are made to find the optimum angle of diagrid, roof displacement, storey drift, and effectiveness of the diagrid structure with the framed structure in resisting lateral loads. Based on the results of the analyses, it is found that the diagrid structure with 65° diagrid angle is more effective in resisting lateral loads and reduced roof displacements, storey drift compared to a framed structure. Diagrid R.C structure saves approximately 8% of concrete and 15% reinforcement, whereas the diagrid steel structure saves approximately 18% of structural steel. Key Words: Diagrid structure, Lateral Stability, R.C Structure, Steel Structure, Optimum angle, Lateral loads, Displacement.
1. INTRODUCTION Due to rapid urbanisation construction of tall buildings has rapidly increased. As the height of buildings increases, the lateral load resisting system becomes more important than the structural system that resists the gravitational loads. The lateral load resisting systems that are widely used are mainly moment resisting elements, shear walls, braced systems, outrigger systems, and diagrid systems. The diagrid structural system is becoming popular in the design of tall structures due to its structural and architectural advantages. Diagrid is an exterior structural system in which perimeter columns are replaced with diagrids. Shear and overturning moment developed are resisted by the axial action of these diagonals, compared to the bending of vertical columns in a framed structure. [1]. Optimum angles for diagrids are between 35 and 90 degrees. Diagrid members transfer both lateral and gravity load through axial action, enhancing lateral load resistance and requiring less structural material. Triangular grid pattern of diagrids adds aesthetic value to the structure. The present study focuses on the effectiveness of the diagrid system in resisting lateral loads when compared to a framed structure. Concrete and Steel structures were analysed with both framed and diagrid systems. As the optimum angle of the diagrid depends on the geometry of the structure, analyses were made to determine the optimum angle of the diagrid. Performance of the diagrid structure is analysed based on the maximum displacement, storey drift, axial force, shear force, bending moment and saving of structural material. Analyses are performed based on IS codal provisions.
2. LITERATURE REVIEW Many researchers have done work in the field of diagrid structures. A few studies are mentioned along with their key findings. Diagrids improve the aesthetic appearance of the structure without compromising structural integrity. The diagonal members in diagrid structural systems carry gravity loads as well as lateral forces due to their triangulated configuration. It saves up to 20% of structural material compared to a framed structure. [2]. Diagrid Structure performs better as a lateral load resisting system than shear wall and bracing systems. Diagrid Structure has the least Maximum Lateral Displacement and Maximum Storey Drift. [3]. Jani Khushbu, Patel Paresh V. [4] has done analysis and design on 36 36-storey diagrid steel building. A floor plan of 36 m x 36 m is adopted. Wind loads and Earthquake loads are considered for analysis. Load distribution for peripheral diagrids and interior columns is studied for a 36-storey building. From the results, it can be observed that diagrids resist most of the lateral loads, while gravity load is resisted by both the internal columns and peripheral diagrids.
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