Impact of Vertical Irregularities on Seismic Response Modification Coefficients of Dual Concrete Shear Wall-Frame Systems

Document Type : Research articles

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Civil Engineering Department, Faculty of Engineering at Shoubra, Benha University, Cairo, Egypt.

Abstract

This study investigates the impact of vertical irregularities on the seismic response modification coefficients (R factors) of dual concrete shear wall-frame systems. Three-dimensional models of 5-, 10-, and 15-story buildings were developed, adhering to the design provisions of the Egyptian Code for the Design of Concrete (ECP 203, 2020) and considering loads specified by the Egyptian Code for Loads (ECP 201, 2012). Two types of vertical irregularities - geometrical and in-plane discontinuity - were introduced at three distinct locations (base, one-third, and two-thirds of the height) with varying severity levels. Pushover analysis was employed to evaluate the seismic behavior of the structures and determine their response. The primary objective was to assess the influence of these irregularities on R factors and compare them with code recommendations. The results indicate that the R factor exhibits an inverse proportionality with respect to the presence of dual systems. Geometric irregularities decrease R factors in structures with 5 or fewer stories, followed by a peak in 10-story structures and a gradual decrease for taller buildings. Conversely, geometric irregularities appear to have an inverse effect on the influence of in-plane discontinuities on R factors. Structures with 5 or fewer stories experience an increase in R factors with increasing discontinuity, peaking in 10-story structures, and then decreasing 
with height. The average R factor across all configurations was 5.8, with a maximum value of 9.78 observed in 5-story structures with specific discontinuity irregularities. This investigation provides valuable insights into the seismic performance of dual concrete systems subjected to vertical irregularities. The findings highlight the importance of considering these irregularities when determining R factors for seismic design, potentially leading to more accurate and performance-based design approaches. 

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