Multi-stage deformation of plastic hinges in RC frame beams at accidental actions
https://doi.org/10.33979/2073-7416-2025-122-6-2
Abstract
The risk of accidental damage to buildings is currently increasing. This makes traditional design strategies, which focus on eliminating such impacts or designing key elements, ineffective and economically unreasonable. The most promising approach is to ensure the robustness of structures by limiting the extent of collapse after initial local failure. The goal of this study is to develop a calculation model for the resistance of a beam support section of a reinforced concrete frame under multi-level deformation in an accidental situation. The rationale for selecting a physical resistance model in the form of a structural node with support sections of beams and columns is explained. A calculation model has been developed to determine the resistance of support sections of beams in a reinforced concrete frame building under multi-level deformation in an extreme state resulting from an accidental situation. Analytical expressions have been obtained for the characteristic points of the "moment-rotation angle in a plastic hinge" diagram for flexural and compressive arch action, as well as for the "axial force-elongation" diagram for tensile catenary action. The proposed approach enables the evaluation of the load-bearing capacity of reinforced concrete frames under extreme conditions resulting from accidental events. The results of the study can be used to design structures that are more robust.
Keywords
robustness,
progressive collapse,
compressive arch action,
tensile catenary action,
reinforced concrete,
frame,
joint
Supporting agencies: This work was supported by the Russian Science Foundation grant No. 24-49-10010, https://rscf.ru//project/24-49-10010/. This work was supported by the Belarusian Republican Foundation for Basic Research grant No. T23RNFM-060.
About the Authors
S. Y. Savin
National Research Moscow State University of Civil Engineering
Russian Federation
Russian Federation
Savin Sergey Yu., Сandidate of Tech. Sc., associate professor of the department of Reinforced Concrete and Masonry Structures
Moscow
A. A. Lizahub
Brest State Technical University
Belarus
Belarus
Aliaksandr Al. Lizahub, master of eng. science, junior research fellow of BL «RCIC»
Brest
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Review
For citations:
Savin S.Y., Lizahub A.A. Multi-stage deformation of plastic hinges in RC frame beams at accidental actions. Building and Reconstruction. 2025;(6):36-46. (In Russ.) https://doi.org/10.33979/2073-7416-2025-122-6-2
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