International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 3058 Numerical evaluation of diagrid system with other grid system using ANSYS software Ancy Eldho 1 , Anila C Shaju 2 , Inus Paulose 3 1 Mtech student, Structural and construction management, MGMCET, Pampakuda P.O, Muvattupuzha, Kerala, India 2 Assistant professor, Civil Department, MGMCET, Pampakuda P.O, Muvattupuzha, Kerala, India 3 Assistant professor, Civil Department, MGMCET, Pampakuda P.O, Muvattupuzha, Kerala, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Diagrid structures are designed with new geometric layouts. The flexibility and aesthetic appearance make it unique. In this paper comparing four grid systems such as O Grid, Elliptical grid, concentric grid and Forward grid with ANSYS workbench 2021 R2. Also the connection bracings are provided with three shapes such as H, I and C. Analysis with an outrigger with O Grid H, I, C shape is also performed. Analysis is mainly used to determine the seismic performance of models, energy absorption capacity and ductility of the models. After analysis the result obtained that, by comparing with other models O Grid models are between the forward and elliptical bracing systems, and have appropriate load bearing and can absorbed great energy with their axial and flexural behaviour. The utility performance of OG rid with C section shows better result. Key Words: Diagrid Grid, O Grid, Elliptical bracing system, Grid bracing system, forward bracing seismic response. 1. INTRODUCTION 1.1 General Background Diagrid constructions have frames arranged in a triangular modular quadrilateral. These triangular members resist vertical and lateral loads. Because there are no elements or columns. A modular framework consists of larger interlocking steels. This system has or does not have vertical components, and since the primary load components are members, they also have lateral support. Ties are commonly used to stabilize a building structure against lateral loading. The main function of the struts is to stabilize the structure and prevent its collapse. Various fastening systems are currently in use. Depending on the shape, the braces are diagonal bracings, X-shaped, K-shaped-shaped, elliptical and O-shaped. In this paper different bracing systems are numerically analysed. 2. NUMERICAL INVESTIGATION USING ANSYS WORKBENCH 2021 R2 Numerical modelling of different grid systems like O Grid, Elliptical grid, concentric grid and Forward grid with different sectional geometries were done using ANSYS 2021 R2 WORKBENCH, a finite element software for mathematical modelling and analysis. The dimension of frame is 3000x3000mm. Utility performance of different O Grid outrigger with H, I, C sections is also performed. The dimensions and properties of all the beams and columns of all the specimens are same. The size of different section geometries are shown in Table 1. The different section property are selected from IBC code and the geometries are showed in Table 2. Table -1: Different Brace Section Geometries. NAME OF MODEL COLUMN SECTION BEAM SECTION BRACE SECTION O Grid IPB 160 IPE180 IPE120 Elliptical grid IPB 160 IPE180 IPE120 Angular grid IPB 160 IPE180 IPE120 Forward grid IPB 160 IPE180 IPE120 Table 3 shows the material property of different bracing system. Figure 1 shows a typical example of an O Grid with an I-section geometry, Figure 2 shows a typical example of an elliptical with a C-section geometry, Figure 3 shows a typical example of a concentric grid with H-section geometry and Figure 4 shows the typical example of forward I- section geometry. Table -2: Section Property. Section property IPB 160 IPE180 IPE120 Depth 160 180 120 Width of flange 160mm 91mm 64mm Thickness of flange 13mm 8mm 6.3mm Thickness of web 8mm 5.3mm 4.4mm