Comparative Analysis of High rise Reinforced Concrete Structures - Engineering Assignment Help

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Abstract

This study presents the seismic performance evaluation of reinforced concrete frame (RC) designed according to Ethiopian (based on EN1998-1) and Chinese seismic codes to realize the best practices within these codes and propose the new generation nonlinear dynamic analysis (NLRHA-Nonlinear Response History Analysis & NLTHA-Nonlinear Time History Analysis) of the design procedure according to "Tall Buildings Initiative, Guidelines for Performance-Based Seismic Design of Tall Buildings, 2010" developed by Pacific Earthquake Engineering Research Center (PEER); The design of high rise buildings using PBD approach over the adopted prescriptive code for the use of local consultants and contractors in Ethiopia.
In the study, three models of RC with 5-, 25- and 75-story frames are designed with the corresponding codes. Then, their seismic performance is evaluated using the PBD nonlinear dynamic analysis techniques. Dynamic nonlinear time history analysis is also performed to validate the analysis results. The comparison parameters include elastic stiffness, peak strength, target displacement, drift ratios and plastic joint formation patterns in the structures. The results show many similarities in the global and
local performances of the structures. Nevertheless, some remarkable discrepancies are also found. Moreover, the analysis of the performance points showed a significant difference in the target displacement, reflecting the main inconsistencies in the demand spectrum of the two codes, especially for the oscillation period greater than 2.0's. In conclusion, the study highlighted the beneficial aspects of both codes that will be useful for future studies (Getachew et al., 2020). This paper also presents an analysis of the seismic design method Performance-Based to overcome the perceived drawbacks and limitations of the existing seismic design approach based on force in engineering practice. Considering the peculiarity of earthquake as a load and the fact that the seismic resistance of structures depends solely on their behavior in the nonlinear domain, the traditional seismic design approach based on force and linear analysis is not adequate. Performance-Based seismic design method is based on nonlinear analysis and can be used in daily engineering practice. This paper presents the application of this method to 5, 25 to 75 stories high reinforced concrete buildings with moment frame structural system (reinforced concrete frame structural system) in one direction and reinforced concrete ductile wall system in the other direction). The nonlinear time-history analysis is performed on the spatial model of the structure using ETABS vs 2018 program, exposing the structure to selected real
earthquake records. A large number of results were obtained for the considered building. It was found that with this method we can evaluate with a high degree of reliability the structural response under earthquakes. Significant differences were found in the response of the structures to different earthquake records. The analysis also showed that the frame structure does not perform well when exposed to earthquake records on soils such as sand and gravel, while a ductile wall system shows
satisfactory behavior on different types of soils (Pejovic et al., 2015).

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