Dynamic and Nonlinear Static Analysis of RC Structures with Steel Bracing

Dynamic and Nonlinear Static Analysis of RC Structures with Steel Bracing

Asst. Prof. Nirav Patel1, Deepak Koirala2

1 Department of Civil Engineering & Parul University, Gujarat, India

2 M.tech. Structural Engineering, Department of Civil Engineering & Parul University, Gujarat, India

Abstract

This work examines the nonlinear seismic behaviours of both non-retrofitted and retrofitted four-story reinforced concrete frames. For retrofitting, steel V-shaped bracings are employed. To look at the seismic behaviour characteristics, nonlinear dynamic analyses and nonlinear pushover analyses are carried out using seven earthquakes. Both non-retrofitted and retrofitted RC frame constructions exhibit the base shear, the fundamental time period (FTP) of the structure, capacity curves, failure patterns, maximum displacements, and maximum drifts. The steel V-shaped bracings are engineered to withstand 50% of the total base shear applied to the structures. The steel bracings shorten the basic time periods and raise the constructions' base shear. The ductility and seismic base shear capacity of the existing structures are increased by the addition of steel bracing. It was also noted that the columns must resist at least 50% base shear in order to produce the anticipated failure pattern. The V bracings lessened the structures' displacement and drift. Effectively enhancing the seismic behaviours of the structures are the V-shaped steel bracings.

Keyword: Pushover analysis, time history analysis, maximum displacements, inter-story drifts