PSI - Issue 46

Ashikur Rahman Simon et al. / Procedia Structural Integrity 46 (2023) 162–168 Simon A. R. et al./ Structural Integrity Procedia 00 (2019) 000–000

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1. Introduction Generally, shear wall can be defined as a vertical structural element that can resist the combination of shear, moment, and axial load induced by lateral loads such as wind load and earthquake load (Rokanuzzaman et al., 2017). It is a rigid vertical diaphragm that is capable of moving lateral loads in a direction parallel to their planes from exterior walls, floors, and roofs to the ground foundation (Ali & Aquil, 2014). Due to different factors such as availability of usable land, cost of land, development of urban areas, development of modern structural systems, high-rise buildings are becoming very common. But increasing the height of the building makes it susceptible to lateral loads. An introduction of shear wall can be a structurally efficient solution to this problem. Shear walls are proven to be extremely effective in terms of structural stability (Magendra et al., 2016). A research was conducted to investigate the behavior of structure by varying percentage length of shear walls with an aspect ratio (L/B) of 1 for seismicity and concluded that for a square type of building having a length of shear walls 10 to 20% of plan dimension shows efficient seismic performance (Halkude et al., 2015) . If shear walls are placed properly, they can provide adequate strength and stiffness to control lateral displacements. Therefore, a thorough investigation is necessary to find out the optimum location of shear walls in RC buildings to control drift and deflection. In this study, a detailed investigation was carried out to find out the proper location and orientation of shear walls in RC buildings in earthquake zone II of Bangladesh. For this purpose, a (G+9) storey building with 10 feet height for every storey is selected. Six structural models have been developed with different locations of shear walls under the BNBC 2020 using the software ETABS 2016 V16.2.1. The analytical results are displayed in terms of storey shear, lateral displacement, storey drift, torsional irregularity, storey stiffness, and time period. 2. Methodology 2.1. Description of the framed building For analysis, a ten-storied (G+9) reinforced concrete building over a land area of 56 ft x 40 ft has been selected in earthquake Zone II as per Bangladesh National Building Code 2020 (BNBC, 2020) (zone factor = 0.20). The parameters of the building are summarized in Table 1. Table 1. Building details Sl. No. Particulars Data 1 No. of storey 10 2 Plan dimension 56ft x 40ft 3 Storey height 10ft 4 Grade of concrete M30 5 Grade of steel Fe420 6 Thickness of slab 5in 7 Grade beam size 12in x 15in 8 Beam size 12in x 15in 9 Column size 12in x 20in, 15in x 18in 10 Seismic zone II 11 Importance factor 1 12 Site co-efficient 1.2 13 Earthquake load BNBC 2020 14 Thickness of shear wall 10in 15 Load assign BNBC 2020