On the Causes of Catastrophic Destruction of Reinforced Concrete Structures under Seismic Impacts

The catastrophic destruction of residential buildings made of reinforced concrete of mass construction in recent decades during the earthquake on February 6, 2023 on the territory of the Republic of Turkey revealed the low ability of their resistance to seismic impacts of great strength not provided for by the project. In this case, in order to save people’s lives and evacuate them, it is necessary to ensure a delay in time in the process of destruction of reinforced concrete structures, by using reliable, not losing resistance at the extreme stage of deformation, as well as adhesion at the anchoring and overlapping points of rods, concrete and reinforcement. This should be facilitated by the methods of non-linear calculation used in the design and design techniques for the most critical load-bearing elements and their cross-sections, as well as reinforcement that provides plastic deformation of structures in order to redistribute the forces necessary for the dissipation of seismic impact energy. To improve the safety of earthquake-resistant construction, it is proposed to assess the ability to plastic deformation of design solutions for reinforcing reinforced concrete elements according to the requirements of clause 6.7.2 of SP 14.13330.2018, as well as according to the methodology given in the publication, repeatedly used in the design practice of the NIIZHB name after A.A. Gvozdev JSC “SIC “Construction”. In terms of the effectiveness of adhesion to concrete, especially in the extreme stage of plastic deformation (after reaching the stresses in the metal σ_т(02)), new domestic types of reinforcing bars with multi-row profiles of classes A500SP, Au500SP and screw Av500P, recommended for the use of SP 14.13330.2018 (change № 2), significantly exceed foreign analogues. Their mass production and use will increase the safety of construction and the competitiveness of domestic fittings on the world market. It is advisable to develop a “Code of Safe Design and Construction of Buildings in Seismic Areas” for widespread use, in which to identify reliable, simple and inexpensive requirements that are mandatory for monitoring construction in areas with high seismic activity.

I.N. TIKHONOV, Doctor of Sciences (Engineering), Head of the Center № 21(This email address is being protected from spambots. You need JavaScript enabled to view it.)

Research Institute of Concrete and Reinforced Concrete (NIIZHB) named after A.A. Gvozdev

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