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Dynamic Behavior of RC Framed structures with Hybrid Irregularities in Seismic Conditions

 

 

VEERLA WESTON SUDHAKAR

Regd. No: 323232907010

 

Under the guidance of

Sri. K. Dileep Chowdary M. TECH,(Ph.D)

Assistant Professor

“MASTER OF TECHNOLOGY” IN

CIVIL ENGINEERING

With specialization in

STRUCTURAL ENGINEERING

 

 

ABSTARCT
 

Structural irregularities are known to intensify the seismic vulnerability 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 from mass concentration with reduced lateral resistance from stiffness reductions. Such conditions lead to severe stress localization, irregular drift patterns, and higher probability of soft-storey mechanisms under seismic loading.

The present study evaluates the seismic performance of RC framed buildings with hybrid irregularities and compares them with regular frames of identical dimensions and loading conditions. A six-storey (G+5) RC frame is modeled and analyzed using the Response Spectrum Method (RSM) in compliance with IS 1893 provisions, implemented through ETABS software. Key seismic response parameters, including fundamental natural period, base shear, lateral displacement, and storey drift, are assessed across different seismic zones of India.

The findings reveal that hybrid irregular buildings exhibit significantly altered dynamic characteristics, with prolonged natural periods, amplified storey drifts, and uneven shear distribution. These results highlight the compounded vulnerability of hybrid irregularities and emphasize the importance of incorporating realistic irregularity effects in seismic design for improved safety and performance of RC buildings.

 

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