Study on structural performance and sustainability of RC buildings through design optimizations and mini-haunch connections

Abstract

The demand for optimized RC frame designs with column-free spaces has led to the increased use of haunched beams in reinforced concrete (RC) structures. Haunched beams, characterized by a thicker cross-section at the supports compared to the mid-section, are typically placed at the bottom of beams, minimizing the need to alter the top flange or remove the floor slab. These beams create rigid moment connections between beams and clumns, enhancing the structural stability of RC frames. This research focuses on the performance and sustainability of RC frame structures by investigating the application of the Mini-Haunch connection, a novel beam-column joint design, to optimize structural behavior. The study evaluates the effects of various design optimizations, such as concrete grade, column size, and beam configuration, on the structural performance of low-to-medium-rise RC buildings. A non-linear static analysis using pushover analysis is performed on RC building frames under seismic loading (Zone IV), considering IS 1893 (Part 1): 2002 for design parameters. The study compares base shear, natural period, and hinge formation patterns of the buildings with and without the Mini-Haunch connection. The findings show the potential of the Mini-Haunch connection to enhance the sustainability and performance of RC moment-resisting frames, promoting more efficient designs with reduced material usage.