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Wind Response of RC Framed Structures with Hybrid Irregularities

 

 

Submitted by

Pitta Srinivas Kumar Reddy

(Regd. No: 323232907006)

 

Under the guidance of

Smt. B. Prudvi Rani, M. Tech,(Ph.D)

Assistant Professor

Structural Engineering

DEPARTMENT OF CIVIL ENGINEERING

SANKETIKA VIDYA PARISHAD ENGINEERING COLLEGE

 

 

ABSTARCT

 

Structural irregularities are known to amplify the wind-induced response of reinforced concrete (RC) framed buildings. Among these, hybrid irregularities characterized by the coexistence of both mass and stiffness discontinuities are particularly critical, as they combine the adverse effects of increased inertia due to mass concentration with reduced lateral stiffness. Such conditions result in non-uniform pressure distribution, localized stress concentrations, and amplified lateral sway under wind loading.

The present study evaluates the wind performance of RC framed buildings with hybrid irregularities and compares them with regular frames of identical geometry and loading conditions. A six-storey (G+5) RC frame is modelled and analysed in compliance with IS 875 (Part 3): 2015, implemented through ETABS software. Key wind response parameters, including, base shear (wind-induced), lateral displacement, and storey drift, are assessed for different basic wind speeds representing various wind zones across India.

The findings reveal that hybrid irregular buildings exhibit significantly altered characteristics, higher lateral displacements, and uneven distribution of wind-induced shear forces. These results highlight the compound vulnerability introduced by hybrid irregularities and emphasize the necessity of considering such effects in wind-resistant design to ensure serviceability, occupant comfort, and overall structural safety of RC buildings.

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