SEISMIC RESPONSE OF ASYMMETRIC REINFORCED CONCRETE STRUCTURES USING STATIC PUSHOVER AND ADAPTIVE PUSHOVER ANALYSIS

Abstract

With the immense loss of life and property witnessed in the last couple of decades alone in India, due to failure of structures caused by earthquakes, attention is now being given to the evaluation of the adequacy of strength in RC framed structures to resist strong ground motions. To determine structural response beyond yield point, out of two types of nonlinearity material and geometrical, material nonlinearity is considered in present thesis. As such, nonlinear analysis can play an important role in the analysis and design of new and existing buildings. In Nonlinear Static procedure both predetermined target displacement and force distribution pattern are based on a false assumption that the structural behavior and its responses are dominated by the fundamental vibration modes. Therefore, over the past decades, there have been a great number of studies on considering higher mode contribution in nonlinear static results. The Displacement-based Adaptive Pushover Analysis (DAP) is one of the performance assessments tool for improving the accuracy of the obtained results of nonlinear static analysis in estimating the seismic demands of the structures. In the present thesis, RC Moment Resisting Irregular Frames (inverted L Shape) of 6 Storey is analyzed for seismic Zone IV and designed as per IS code provisions, considering both seismic and gravity loads. Further, performance evaluation of above frames is done using Nonlinear Static Pushover Analysis, Displacement based Adaptive Pushover Analysis using SeismoStruct software. Performance evaluation is done from the performance criteria mentioned in ATC-40 and FEMA-356 in terms of capacity curve.