Objectives: To examine the seismic behaviour of an Reinforced Concrete (RC) building for Seismic Zone II while investigating the effectiveness of Lead Rubber Bearing (LRB) isolation system for that structure in Seismic Zone V. Method: The G+8 RC building is designed in ETABS following IS 456:2000 and IS 1893:2016. After verifying its safety under Zone II seismic loads, the building is analysed under the more severe Zone V conditions, where several structural members get fail. An LRB isolator is designed in ABAQUS and incorporated into the ETABS model. The building’s performance is evaluated using parameters such as base reaction, storey displacement, storey drift, time period, beam bending moment, beam shear force and column axial force. Findings: The structure was safe under Zone II loads, whereas several members failed under Zone V seismic loading due to increased seismic demands. Compared to Zone II, increases of 260.2% base reaction, 260.6% storey drift, 252.1% storey displacement, constant time period, 148.3% bending moment, 105.6% shear force, 15.1% and 4.3% axial load in two selected columns were observed. With LRB isolation, reductions of 46.9% base reaction, 13.3% storey drift, 8.68%bending moment, 22.4% shear force, 14.9% and 11.1% axial load were achieved, while storey displacement and time period increased by 66.1% and 97.3%, respectively, compared to the fixed-base Zone V structure. Consequently, the failed members satisfied the design criteria after isolation. Novelty: It is evident from the study that there is an effective way to enhance seismic performance through the use of LRB base isolation system in order to increase seismic capacity without altering member size in low-seismic structure.
Keywords: Seismic Performance, Multistorey Reinforced Concrete Building, Lead Rubber Bearing, Base Isolation, Storey Displacement
Manish Haveri, Nagaraj Tuppad, R. Gowda· Indian Journal of Science an...· 0 citations
Objectives: Irregular buildings are highly prone to torsional effects and excessive lateral deformations during earthquakes due to the non-uniform distribution of mass and stiffness. Although in Reinforced Cement Concrete (RCC) frame steel bracing systems and shear walls are widely used to enhance seismic performance, comprehensive comparative studies involving multiple bracing configurations and shear walls with identical location and orientation in irregular Steel–Concrete Composite (SCC) buildings remain limited. This study evaluates the effectiveness of different seismic resistance techniques in improving the seismic behaviour of an irregular SCC building. Method: A G+15 storey L-shaped SCC building was modelled and analysed in ETABS 22.0. For the same SCC structure five steel bracings Diagonal, Inverted V, V, K and X bracing and Reinforced Concrete (RC) shear walls were incorporated at identical locations. Response Spectrum Analysis (RSA) was performed in accordance with IS 1893(Part 1):2016. Seismic performance was assessed using storey displacement, storey drift, storey stiffness, fundamental time period and torsional irregularity ratio. Findings: The integration of seismic resistance techniques significantly improved the seismic performance of the irregular composite building. Among the bracing systems, X-bracing showed the best performance by reducing storey displacement, storey drift and fundamental time period by 56.06%, 60.42% and 37.88%, respectively. Inverted V-bracing provided the highest storey stiffness, whereas K-bracing achieved the lowest torsional irregularity ratio. The shear wall system showed best overall improvement, reducing displacement, drift, fundamental time period and torsional irregularity ratio by 70.29%, 76.52%, 51.63% and 40.87%, respectively, while achieving the highest storey stiffness. Novelty: Unlike previous studies focused on RCC and regular buildings or individual strengthening systems, the present study provides a comprehensive comparison of SCC structure with five steel bracing configurations and RC shear walls placed at identical locations under identical modelling, loading and seismic conditions to identify the most effective seismic resistance strategy.
Keywords: Steel-Concrete Composite structure, Plan Irregularity, Steel Bracing, Shear Wall, Response Spectrum Analysis
Manish Haveri· Indian Journal of Science an...· 0 citations
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