PSI - Issue 70

Rishi B. Mathur et al. / Procedia Structural Integrity 70 (2025) 372–379

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element in each structural system need to be treated as Capacity protected element. Table 1 shows the types of elements in different structural systems. 2. Objectives The objective of this study is to analyse the seismic behaviour of steel buildings by employing various structural systems in a multi-story framework, in accordance with the provisions outlined in IS 18168:2023. The code specifies new limiting width-to – thickness ratio for selection of compression element which was used while modelling the structures in ETABS. The analysis of SMRF, SCBF & EBF system is carried out in accordance with the provisions specified in the code. The performance of each system is assessed by comparing key seismic response parameters such as storey drift, maximum story displacement, time period and base shear. 3. Methodology A G+4 storey commercial building is prepared to serves as test case for this study. Three type of structural systems are compared: (a) Special Moment Resisting Frame (SMRF) structure, (b) Special concentrically Braced frame (SCBF) structure & (c) Eccentrically Braced Frame (EBF) structure. To have an accurate comparison, all three structural system have the same height, same floor area & floor height. Figure 2, 3 and 4 show 3D model and Elevation plan of SMRF, SCBF and EBF structure respectively. Table 2 shows the building detail and Table 3 section classification used for modelling the structures. The beam- column strength ratio is checked with the code manually.

Table 2 . Structure Configuration

Parameters

Values

Plan Dimension Total Height of building Type of Building Height of Each Storey Thickness of deck slab

18m X 21m 14m Commercial 3.5m 110mm IV th Medium Soil 1.2

Seismic Zone Soil Condition Importance Factor Zone Factor Grade of Concrete (secondary beams)

0.24 M25

Grade of Structural Steel Grade of Reinforcing Steel

Fe350 Fe500

Fig 1. Building Plan

Table 3. Section Classification

Section

SMRF

SCBF

EBF

Beam (I-section)

NPB 400 x 200 x 67.28

NPB400 x200 x 67.28

NPB 400 x 200 x 67.28