COMPARISON OF ANALYSIS RESULTS OF STEEL FRAME OF FRAME BUILDINGS IN ACCORDANC WITH SP RK EN 1998-1:2004/2012 AND SP RK 2.03-30-2017*

Abstract

In the Republic of Kazakhstan, a transition has been implemented to new structural design standards, SP RK EN, which are harmonized with the Eurocodes and include National Annexes. At present, in the field of seismic design in Kazakhstan, two regulatory documents coexist in parallel: SP RK 2.03-30-2017* “Construction in Seismic Regions” and SP RK EN 1998-1:2004/2012 “Design of Structures for Earthquake Resistance. Part 1: General Rules, Seismic Actions and Rules for Buildings,” along with their respective Scientific and Technical Guidelines (STGs). According to Clause 1.4(5) of SP RK EN 1990:2002+A1:2005/2011 (the fundamental basis of the Eurocode system), alternative design rules differing from those specified in EN 1990 may be applied, provided that such alternative rules comply with the fundamental principles and ensure structural safety, serviceability, and durability at least equivalent to those required by the Eurocodes. This study compares the results of analyses of reinforced steel moment-resisting frames of frame-type buildings, obtained using the design provisions of SP RK 2.03-30-2017* and SP RK EN 1998-1, in order to verify the compliance of SP RK 2.03-30-2017* with Clause 1.4(5) of SP RK EN 1990. The objective of this study is to assess the compliance of the requirements of SP RK 2.03-30-2017* with the provisions of Clause 1.4(5) of SP RK EN 1990 through a comparative analysis of the results of three-dimensional structural analysis of steel moment-resisting frame buildings performed in accordance with the current national design code and the new Eurocode-based regulatory documents. The study is based on the numerical modeling of a three-dimensional steel frame using two design approaches, namely the current national code and the newly adopted Eurocode-based standards. A comparative evaluation of structural displacements, internal forces, stiffness characteristics, and the principal design parameters of the load-bearing frame elements was carried out. The obtained results make it possible to determine the degree of agreement between the structural response predicted by SP RK 2.03-30-2017* and SP RK EN 1998-1, as well as to evaluate the applicability of the national code as an alternative design approach for buildings located in seismic regions. The scientific novelty of the study lies in the comprehensive comparative assessment of the equivalence of the new regulatory framework for the three-dimensional analysis of steel frame buildings subjected to seismic loading. The findings provide a scientific basis for the further harmonization and updating of Kazakhstan's national seismic design standards in accordance with the Eurocodes and contribute to the improvement of engineering practices for earthquake-resistant structural design.