PSI - Issue 71

Varsha Harne et al. / Procedia Structural Integrity 71 (2025) 279–286

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3. Structural Model In this examination, six different prototypes of a G+10 RCC structure are considered for the analysis, which differ with respect to the arrangement of infill walls and the toughness of columns and beams. The building features 4-5 m bays orientated in the X-direction and 4-4 m bays in the Y-direction, with each storey height measuring 3 m. The depth of the foundation is measured at 3 m. The structure is intended to be symmetric in both orthogonal directions in order to prevent torsional response. ● Seismic zones (Z) II and V are where the building is thought to be. ● Importance factor = 1.2, Response Reduction factor = 5 (SPECIAL RC MOMENT-FRAME) ● The structure is supported by isolated footings beneath the columns, which is based on medium-strength soil for 5% damping. ● The building geometries visually depicted in Fig. 1 adhered to the design standards outlined in IS 456:2000. ● Strength of Concrete = 30 N/mm², Yield strength of Steel = 500 N/mm² ● Modulus of Elasticity for masonry and concrete are 5,500 MPa and 27,386 MPa, respectively, and their corresponding Poisson’s ratios are 0.15 and 0.20. ● The estimated unit weights for masonry and concrete are 20.0 kN/m 3 and 25.0 kN/m 3 , respectively. ● FF for the floor is 1.1 kN/m 2 . The floor's DL and LL are assumed to be 3.125 kN/m 2 and 2.0 kN/m 2 , respectively. ● Axial hinges (P-M- M) were attached to the column’s end, whereas moment hinges (M3) were used on the beam’s end.

Prototype No.2 consists of infill walls along the peak of the structure, with weak columns strong beams.

Prototype No. 3 comprises infill walls along the peak of the structure, excluding the first floor level and featuring weak columns-strong beams.

Prototype No.1 shows a bare structure with weak columns-strong beams.

Prototype No. 6 comprises infill walls along the peak of the structure, excluding the first floor level and featuring strong columns-weak beams.

Prototype No. No.5 consists of infill walls along the peak of the structure, with strong columns-weak beams.

Prototype No.4 shows a bare structure with strong columns-weak beams.

Fig. 1. Different configurations for investigation of building's infill wall.

The representation of brick masonry infill followed the unified single equivalent strut method in accordance with IS: 1893 – 2016 guidelines shown in Fig. 3 and Fig. 4, and its calculations were based on equations (1) and (2).