COMPARATIVE CALCULATIONS OF FRAME BUILDINGS WITH REINFORCED CONCRETE FRAMES ACCORDING TO STANDARDS SP RK EN 1998-1:2004/2012 AND SP RK 2.03-30-2017*

Abstract

Kazakhstan has implemented the transition to new building design standards SR RK EN, identical to the Eurocodes, with National Appendices. At the moment, in Kazakhstan, in the field of seismic design, two regulatory documents coexist in parallel. These are SP RK 2.03-30-2017* "Construction in seismic zones" and SP RK EN 1998-1:2004/2012 "Design of earthquake-resistant structures. Part 1. General rules, seismic effects and rules for buildings" and scientific and technical manuals for them. According to 1.4(5) SP RK EN 1990:2002+A1:2005/2011 (the main fundamental document of the Eurocodes), alternative design rules that differ from the EN 1990 rules, may be used if the alternative rules are consistent with the fundamental principles and ensure structural safety, serviceability and durability at least equivalent to those provided for in the Eurocodes. This paper compares the results of calculations of moment reinforced concrete frames of frame buildings obtained according to the design standards SP RK 2.03-30-2017* and SP RK EN 1998-1 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 compare the results of three-dimensional structural analyses performed in accordance with the provisions of SP RK 2.03-30-2017* with the requirements of Clause 1.4(5) of SP RK EN 1990, based on a comparative assessment of the calculation results for reinforced concrete moment-resisting frame buildings designed according to the current and the new regulatory frameworks. The calculation methodology is based on the numerical modeling of a three-dimensional reinforced concrete frame structure, followed by a comparative analysis of stiffness characteristics, displacements, internal forces, and design parameters of structural elements obtained in accordance with SP RK 2.03-30-2017* and SP RK EN 1998-1. The scientific novelty of the study lies in the comprehensive evaluation of the equivalence of the current and the newly adopted seismic design codes as applied to reinforced concrete frame buildings. The findings contribute to the assessment of the consistency between the existing national seismic design provisions and the Eurocode-based regulatory framework and provide a basis for the further improvement and harmonization of seismic design standards in the Republic of Kazakhstan.