An alternative approach to improve the capacity design concept for moment resisting reinforced concrete (RC) frame systems

Scientific paper - Original scientific paper

• Author: Ion Sococol
• Author: Ionut Ovidiu Toma
• Author: Petru Mihai
• Author: Nicolae Taranu
• Author: Mihai Budescu
• Author's institution: University of Zagreb; Faculty of Civil Engineering
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract (english)

Capacity design concept for reinforced concrete frame systems is based on a hierarchy of the strength and stiffness properties of the structural elements so that the seismic energy dissipation mechanism occurs in a certain way. This theoretical concept of seismic energy dissipation by allowing the occurrence of plastic hinges at the end of the beams and the columns located at the ground floor was not observed / identified in post-earthquake inspection of damaged RC frame structures. On the other hand, various failure mechanisms were observed that are not compliant with theoretical considerations specified in the seismic design codes. The damages produced during the latest seismic events, (2020 Zagreb earthquake, 2020 Aegean Sea earthquake, 2020 Caribbean earthquake, 2020 Puerto Rico earthquake, 2020 Mexico earthquake, etc.) raised some concerns related to the theoretical ductile failure mechanism (Strong Column – Weak Beams, SCWB) versus the practical approach. Consequently, a possible improvement of the capacity design concept through the consideration of different values for the behaviour factor “q” applied to structural elements (beams and columns) was investigated and presented in this paper. The goal was to reach the expected theoretical structural degradation mechanism. Thus, by considering different values for the behaviour factor “q”, at the design stage, for beams and columns, it was possible to reach a favourable value for the ratio Kc/Kb between the bending stiffness of columns (Kc) and beams (Kb). Consequently, a good correlation between the real seismic response and the theoretical mechanism of structural deformation was obtained.

• Keywords (english): Behaviour factor, soft storey, bending stiffness, over-strength, ductile failure mechanism
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Unknown
• Publication version: Published version
• Publication title: 1st Croatian Conference on Earthquake Engineering 1CroCEE
• Numbering: pp. 1285-1295
• p-ISSN: 3043-8071
• DOI: https://doi.org/10.5592/CO/1CroCEE.2021.189
• URN:NBN: urn:nbn:hr:237:052329
• Publication: 2021-03
• Conference: Title: st Croatian Conference on Earthquake Engineering; Location: Zagreb, Croatia; Start date: 2021-03-22; End date: 2021-03-24; Assembly type: Lecture
• Type of resource: Text
• Publisher: Sveučilište u Zagrebu, Građevinski fakultet
• Access conditions: Open access
• Created on: 2024-08-28 10:17:33