Evaluation of Reinforced Concrete Frames Designed Based on Previous Iranian Seismic Codes
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RESEARCH ARTICLE-CIVIL ENGINEERING
Evaluation of Reinforced Concrete Frames Designed Based on Previous Iranian Seismic Codes Ali Sadeghpour1 · Giray Ozay1 Received: 4 August 2019 / Accepted: 16 April 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract Four editions of the Iranian Code of Practice for Seismic Resistant Design of Buildings have been published. Obvious changes have been made between the second and third editions regarding the seismic design of reinforced concrete buildings. This research focuses on evaluating the design reliability and seismic performance factors provided in the Standard No. 280099 (second edition) and Standard No. 2800-05 (third edition). The performance and seismic characteristics of the seismic design codes were evaluated by using the FEMA P695 methodology. A set of 48 reinforced concrete structural systems and 2112 incremental dynamic analyses were conducted, according to the FEMA P695 methodology. Etabs software was used for preliminary design of the structures, and SeismoStruct software was applied for the sake of nonlinear analyses. The results reveal the vulnerability of certain building stocks designed based on the second edition. Furthermore, the life safety performance level, which is an essential factor according to Standard No. 2800-99, is challenged. In contrast, the structural systems designed based on the Standard No. 2800-05 fulfill the requirements for moderately intense earthquakes. Keywords Overstrength · Pushover analysis · Incremental dynamic analysis · Seismic performance parameters · FEMA P695 methodology
1 Introduction Reinforced concrete (RC) has gained prominence over the years owing to its fire resistance, cost-effectiveness and time efficiency, based on its ease of being molded into different shapes. However, an earthquake is the most severe natural phenomenon affecting numerous structures and inflicting massive damage on buildings; hence, it is essential to account for seismic behavior in structural design. Nonlinear static and dynamic analysis methods can be used to assess the overall performance of structures and their responses to seismic loading, such as damages and collapse, in an accurate manner. The use of nonlinear analysis methods to analyze the seismic demands and capacities of structures provides a reasonable assessment of the seismic behavior of structures that are subjected to major ground motions. However, incremental dynamic analysis (IDA) and fragility analysis are used alternatively by researchers to assess the seismic behavior of
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Ali Sadeghpour [email protected] Department of Civil Engineering, Eastern Mediterranean University, Via Mersin 10, Famagusta, North Cyprus, Turkey
structures. Approximate estimates of the seismic behavior of these structures can be obtained, owing to the randomness and uncertainties in determining the seismic demands and capacities [1]. Significant effort has been made to develop and revise building codes over the years, based on numerous studies and prior knowledge of earthqua
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