PSI - Issue 60

Sarmili Swain et al. / Procedia Structural Integrity 60 (2024) 553–563 Sarmili Swain / Structural Integrity Procedia 00 (2024) 000 – 000

556

4

Table 1. Plan configurational of building Dimensional Specification

Details

Area of Building

100 Sq mts

No. of Bays in X-Direction No. of Bays in Y-Direction Bay width in X-Direction Bay width in Y-Direction Material Specifications Concrete Reinforcement Rebar’s Storey Height

2 2

5 m 5 m

3.2 m

M20

Fe415 Fe345

Steel

Loads Considered Dead load

Self-weight of the structure

Live load Floor load Wall load

3 kN/m 2

1.5 kN/m 2 14 kN/m 2

Table 2. Details of elements of RC frame Building Stories

Column (mm)

Beam (mm)

Slab (mm)

G+3

400x400

200x300

200

2.1. Linear Static analysis using SAP2000 The hypothetical G+3 RC building most commonly found in any urban habitat has been analyzed and designed for gravity loads (self-weight + live load) in accordance with the Indian standard code ( IS 456:2000) (IS 875 Part-1 and Part-2:1987) using the software SAP2000. The design details and structural cross-sections are illustrated in Table 1 and Table 2. Linear static analysis is performed to assess the building's behavior under gravity loads, to ensure the structure's stability and safety in concurrence with codal provisions. Outcome of Static analysis (stage-1) presents the structural behavior and the present condition of building components, serving as a benchmark for evaluating the building's performance under fire exposure. 2.2. Progressive collapse analysis Progressive collapse can result in a disproportionate global failure of a structural system, originating from a local failure. This dynamic process involves the redistribution of loads to neighbouring structural elements as the collapse progresses. The extended load combination for progressive collapse assessment is given in eq.1 in accordance to the GSA (General Service Administration) guidelines (Bilow.D.N, 2003) (Kamara, 2004) . Load = 2 (Dead Load + 0.25 Live Load) …. ( 1) Constrained to the Linear static analysis, the progressive collapse involves instantaneous removal of primary vertical support and analyzing the components of both primary and secondary structural elements. Therefore, the structural elements are quantified by examining the magnitude and distribution of potential demands. These demands are indicated by Demand-Capacity Ratios (DCR) of the structural components and the allowable acceptance criteria given by DCR = Q UD / Q CE …. ( 2) where, Q UD = Acting force determined in structural component (Demand); Q CE = Ultimate expected Capacity of the component.