Design of a multi-story steel building according to the Turkish Building Earthquake Codes: TBEC-2007 vs. TBEC-2018

Abstract

People have built structures to survive and to meet their shelter needs. While buildings had progressed horizontally at first, the increase in population and shrinkage of spaces over time led the construction industry to build multi-story buildings. In the research, the Turkish Building Earthquake Code 2007 (TBEC-2007) and the Turkish Building Earthquake Code 2018 (TBEC-2018) were extensively examined and an 8-story steel business center building having high ductility levels in both directions and consisting of concentrically braced steel frames was designed according to the two earthquake codes. The Equivalent Static Method was utilized while designing according to the codes. For structural elements’ dimensioning, the Regulation on Design, Calculation, and Construction Principles of Steel Structures principles were followed and the Load and Resistance Factor Design Method was utilized. After performing the analyses of the building according to both earthquake codes, the effects of the code differences on the system periods, earthquake loads, lateral displacements, the story drifts, second-order effects, A1 type torsional irregularities, B2 type stiffness irregularities, and dimensioning of the elements were evaluated in detail. It was observed that in TBEC-2018 compared to TBEC-2007, the structure’s coordinates are determined more specifically while identifying the earthquake load, more sensitive soil options are presented, separate calculations according to building height are performed, and base shear forces are smaller. Moreover, it was deduced that there was no significant variance between the codes in terms of calculations of building importance coefficient, natural vibration period, story drifts, and irregularities.