Study regarding the stiffness influence of slab to beams for a plan structural reinforced concrete frame system in seismic zones

Sococol, Ion; Mihai, Petru; Iftode, V. I.; Olteanu-Donţov, Ioana

doi:10.1088/1757-899x/586/1/012013

Cited by 4 publications

(6 citation statements)

References 2 publications

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“…Another particular effect produced by the RC slab is the development of the "common rigid block (RC beams-slab-node)" [15][16][17], [34] which can lead to the appearance of the "soft story mechanism" [5], after severe earthquake loading of the structure.…”

Section: Global Analytical Results Regarding Pushover Analysesmentioning

confidence: 99%

Influence of the longitudinal steel ration in RC beams and steel reinforcement ration in RC slabs on the seismic energy dissipation mechanisms for a MR RC frame structure

Sococol

Petrescu

Mihai

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The MR RC frame structures present a special engineering interest regarding the practical mode of ductile seismic response, through plastic hinges formation in specially designed RC beams end areas and inferior zones of the RC columns from the ground floor. Thus, it was proposed to verify the capacity design concept for this structural system type through seismic response observation of the optimal MR RC frame model. Until this objective is achieved, it was proposed to perform a complex analytical study, which has as finality the current research paper. Thus, in the previous analytical studies the influence of the concrete strength class, the influence of the longitudinal steel reinforcement ratio in RC columns and influence of the RC beams cross sections on the local and global seismic response for a group of RC frame models were analysed. In these conditions, the present paper contains the results obtained in previous research papers and concludes the current analytical study through the observation of the effectiveness of the inferior longitudinal steel reinforcement ratio in the RC beams on the cracking mode, in potentially plastic areas. Finally, it was specified that the K_7 RC frame model represents the optimal structural system for the experimental test.

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Section: Global Analytical Results Regarding Pushover Analysesmentioning

confidence: 99%

Influence of the longitudinal steel ration in RC beams and steel reinforcement ration in RC slabs on the seismic energy dissipation mechanisms for a MR RC frame structure

Sococol

Petrescu

Mihai

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In essence, the present paper aims to validate the mechanical weakening (of resistance and lateral stiffness) method of dissipative structural elements-reinforced concrete beamsin the design stage, highlighting the emergence of the common rigid block "beams-slabframe nodes" [51].…”

Section: General Aspectsmentioning

confidence: 99%

Analytical Study Regarding the Seismic Response of a Moment-Resisting (MR) Reinforced Concrete (RC) Frame System with Reduced Cross Sections of the RC Beams

et al. 2022

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In the last few decades, a series of earthquakes were recorded which pointed out several deficiencies regarding the ductile seismic response of MR RC frame structures. Thus, the research problem centres around the failure mechanisms registered by the structures, which differ from the general notions of seismic response commonly found in current design standards and norms regarding seismic actions. In these conditions, in the present paper—by using comparative methods—the analytical validation of the solution of plastic hinge concentration and seismic energy dissipation in the marginal beam areas is proposed. Therefore, the RC beam sections were reduced (weakened) in the marginal areas which exhibit a plastic deformation potential, as well as in the corner areas of concrete slabs with vertical rectangular holes. The significant outcomes of this research imply the partial “guiding” of plastic hinges in the zones adjacent to beam ends. Furthermore, a reduction of both the negative effects of horizontal rigidization of the beams and the cracking and plastic deformation effects of beam-column frame joints was observed. With these technical implications, a complex mechanism of plastic deformation of MR RC frame models is registered in which all lateral elements (including RC columns) participate in the dissipation of seismic energy, without the occurrence of the “weak storey” mechanism for any of the analytical RC frame models. Furthermore, it is possible to observe the partial formation of the global plastic mechanism “Strong Columns—Weak Beams” (SCWB) for some of the structural models. Finally, the analytically studied innovative element regarding the improvement of the seismic response of pure MR RC frame structures is successfully validated.

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“…Thus, the linear elastic structural elements (RC columns, RC beam-column joints) maintain their integrity through oversizing and the ductile structural elements dissipate the seismic energy by means of plastic hinges. This aspect was emphasized in a recent research work [2] on assessing the seismic behaviour of a GF+3F RC moment resisting frame. The 2D model considered a single value for the behaviour factor, in accordance with the actual seismic regulations [3,26].…”

Section: Theoretical and Analytical Aspects Regarding The Improvement...mentioning

confidence: 99%

“…For the case presented in a recent study [2] and considering the graph shown in Fig. 3, the bending constant stiffness difference between RC columns and RC beams is given in Eq.…”

Section: Theoretical and Analytical Aspects Regarding The Improvement...mentioning

confidence: 99%

See 1 more Smart Citation

An Alternative Approach to Improve the Capacity Design Concept for Moment Resisting Reinforced Concrete (Rc) Frame Systems

Sococol¹,

Toma²,

Mihai³

et al. 2021

1st Croatian Conference on Earthquake Engineering

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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.

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Study regarding the stiffness influence of slab to beams for a plan structural reinforced concrete frame system in seismic zones

Cited by 4 publications

References 2 publications

Influence of the longitudinal steel ration in RC beams and steel reinforcement ration in RC slabs on the seismic energy dissipation mechanisms for a MR RC frame structure

Influence of the longitudinal steel ration in RC beams and steel reinforcement ration in RC slabs on the seismic energy dissipation mechanisms for a MR RC frame structure

Analytical Study Regarding the Seismic Response of a Moment-Resisting (MR) Reinforced Concrete (RC) Frame System with Reduced Cross Sections of the RC Beams

An Alternative Approach to Improve the Capacity Design Concept for Moment Resisting Reinforced Concrete (Rc) Frame Systems

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