Seismic Strengthening of Reinforced Concrete Framed Structures

Reinforced concrete (RC) framed buildings with open-ground-storey and masonry-infilled upper stories introduces severe stiffness- and strength-type of discontinuities, which together causes significant strength and inelastic deformation demand on ground-storey columns during ground shaking leading to partial or complete collapse of the buildings as observed in several past earthquakes around the world. Hence, it is necessary to develop a simple and efficient technique to enhance the lateral strength, stiffness, and energy dissipation potential of such non-ductile RC frames. A strengthening technique consisting of steel caging to increase the lateral strength of deficient ground-storey columns and aluminium shear-yielding dampers (Al SYD) to improve the overall energy dissipation potential and lateral stiffness is proposed to enhance seismic performance of non-ductile open-ground-storey RC frames. A performance-based design method was developed with the objective that the structure should develop sufficient flexural strength and inelastic rotation at a target yield mechanism to withstand the probable seismic demand.

Autorentext

Dr. Dipti Ranjan Sahoo is currently an Assistant Professor at Indian Institute of Technology (IIT) Delhi, India. He received his PhD in Civil Engineering from IIT Kanpur, India. His research interests are seismic strengthening of steel and RC structures, performance-based design and large-scale testing of structural components.