THE EFFECT OF NON-UNIFORMITY OF DIMENSIONS ON THE EVALUATION OF SEISMIC RESPONSE MODIFICATION FACTOR FOR REINFORCED CONCRETE FRAMES.

Abstract

Base shear is measured in existing seismic design codes using the elastic force requirement divided by strength reduction factor. This element is used to take account of structures' ability to dissipate energy by inelastic deformations. This can be divided into three principal components reflecting a structural system ductility, over strength, and redundancy. Such factors depend on both structural system characteristics and ground motion. Earthquake resistant design has recently gained more popularity in Egypt. Nevertheless, there are not enough studies that explain the behavior of various structural structures used in Egypt. In this research, this study focuses on the evaluation of the response modification factor which is considered the main component of the seismic analysis. The parametric study is conducted to understand the response modification factor values of RC moment resisting frames for different number of stories, non-uniform spans and floors height and compared them to uniform bay length and floor height values and compared them with the value of ECP. RC resisting frames are selected as they are commonly used for seismic design in Egypt.