Analytical investigation of hybrid composite precast beams with modified strain compatibility for entire history of nominal flexural capacity

Hong, Won‐Kee; Lee, Yongjei; Kim, Sunkuk; Kim, Seung‐Il; Yun, Yeo-Jin

doi:10.1002/tal.1214

Cited by 9 publications

(15 citation statements)

References 12 publications

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“…They also proposed a simplified formula to evaluate ductility of high-strength CES columns. Hong et al (2015) presented a "modified strain compatibility approach" for a broad range of yield and load limit states which was limited to the frame without axial loads. This approach also did not consider the confining effect provided by steel sections to accurately predict the nominal flexural capacity, leading to inaccurate predicted strengths of the composite frames.…”

Section: Previous Research and Objectivesmentioning

confidence: 99%

An analytical model computing the flexural strength and performance of the concrete columns confined by both transverse reinforcements and steel sections

Nguyen

Hong

2020

Journal of Asian Architecture and Building Engineering

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An analytical model was developed that accounted for double confinement provided by both transverse reinforcements and wide flange steel sections in the compression zone. This study also found that the amount of confinements was very sensitive to the post-yield behavior of the composite columns, especially when the buckling in compression region occurred. The nominal moment capacity and post-yield structural behavior of the composite columns were then calculated. The results were verified by comparison to numerical nonlinear finite element analysis results. The model was also verified experimentally. The post-yield behavior of the composite columns obtained from previous experimental studies and nonlinear finite element analysis based on concrete plasticity agreed well with those of the analytical results presented in this study, demonstrating a reliable and fast evaluation of the post-yield behavior of the composite actions. Fracture criteria for the concrete encasing steel columns under axial and lateral loads were also proposed based on the confinement offered by the steel sections encased in concrete. The new concept engaged in the estimation of the flexural strength of concrete columns confined by encased steel sections added innovations to the state of the art in the body of knowledge and advancement of the composite frames.

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Section: Previous Research and Objectivesmentioning

confidence: 99%

An analytical model computing the flexural strength and performance of the concrete columns confined by both transverse reinforcements and steel sections

Nguyen

Hong

2020

Journal of Asian Architecture and Building Engineering

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“…The interaction between the two materials with integrating pre-cast concrete with steel components presents advantages in terms of reduced structural steel tonnage, shortened construction schedules, and eliminated fire proofs. The precast composite beam has also shown the outstanding structural efficiencies to reduce beam depth as published in the previous works of authors (Hong et al 2008a(Hong et al , 2008b(Hong et al , 2015. Figure 3(a) illustrates a test specimen including 4 continuous vertical reinforcing bars and 20 vertical re-bars that were cut off by connecting them to steel plates by means of bolts, above and below the column steel.…”

Section: Problem Statementmentioning

confidence: 92%

Steel beam–column joint with discontinuous vertical reinforcing bars

Hong

2017

Journal of Civil Engineering and Management

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The authors have previously proposed steel beam-column connections for precast concrete frames. The steelconcrete composite frames combined the advantages of the fast assembly of steel and the low cost of concrete structures. However, when not enough space is available at column-beam joints, steel sections from beams cannot be connected with column brackets. To address this issue, this paper explores the strategy of disconnecting some vertical reinforcing bars at the joints by connecting vertical steel reinforcements to steel plates placed above and below column steels, to provide a load transfer path. Loads from re-bars are transferred to steel plates, column steels, and back to steel plates and re-bars below the column steels. This strategy provided space for beam-column joints of composite frames. Extensive experiments were performed to verify load transfer from re-bars to steel plates above joints and from the steel plates to re-bars below the joint. The flexural load-bearing capacity of a column with a total of 24 vertical re-bars was compared to that of columns with discontinuous re-bars at the joints; the number of discontinuous re-bars at the joint used in the column specimens tested was 0 (0.0%), 4 (16.7%), 12 (50.0%), and 20 (83.3%).

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“…Upon yielding, the strain of the RCVB was approximately linearly distributed on the section, identically to that of the RC beams. [33,34] However, the longitudinal stress of a part of the bottom chord may have been released owing to the upward movement of the beam's neutral axis and the development of horizontal cracks in the shear key during failure, which resulted in an inflection point in the strain distribution along the section height.…”

Section: Strain Distribution Of Sectionmentioning

confidence: 99%

Experimental and numerical study of the flexural capacity of reinforced concrete Vierendeel beams

Zhang

et al. 2021

Structural Design Tall Build

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A reinforced concrete vierendeel beam (RCVB) is an open-web structure formed by connecting the top and bottom chords through block-shaped shear keys. In this study, the static load test was applied to understand the failure state and reinforcement ratios relationship with bending capacity of RCVBs. The results reveal that numbers of horizontal cracks appeared in the chord-key node area of the bendingshear section. The deflection development of specimens experienced elastic, elasticplastic, and plastic stages. The failure of the beam was controlled by the deflection and the ultimate load increased with the reinforcement ratio. A combined model for calculating the bending capacity of the top chords under eccentric compression and the bottom chords under axial tension is proposed. With the measured strains the loading coefficient of the beams are 1.15-1.20. According to the Chinese code, the continuous loading after the longitudinal reinforcement of the bottom chord yielding can make the top chord concrete reach the ultimate compressive strain, and the loading coefficient of the beams are 1.1-1.2. Therefore, the proposed model and formulas can effectively calculate the flexural bearing capacity of RCVBs. The finite element analysis results further indicate that the proposed calculation model and algorithm are appropriate. K E Y W O R D S finite element analysis, flexural bearing capacity, loading coefficient, reinforced concrete vierendeel beam (RCVB), reinforcement ratio, static load test | INTRODUCTIONMultistory large span buildings require a suitable floor system, and reinforced concrete (RC) beams and slabs are commonly used in floor structures. With a large span, the height of the beam section and the required building floor height must be large, which leads to a large self-weight and an obvious seismic response. In the Chinese code, the theory for calculating the flexural bearing capacity of RC beams is based on the calculation model shown in Figure 1. After the concrete in the tension zone cracks, the bending moment M is finally balanced by the resultant force F in the compression zone on the beam section and the tensile force T of the tension steel bars. The concrete in the tension zone of the beam can be removed, but the beam structure must be changed. In 1993, Ma et al. proposed a RCVB comprising a top chord, bottom chord, and shear key (Figure 2) with the structure of a RC open-web sandwich plate (RCOSP) (Figure 3) [1,2] to achieve the following improvements:1. Removing the concrete close to the neutral axis of the beam can reduce the self-weight to reduce the structural response and earthquake impact.

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Analytical investigation of hybrid composite precast beams with modified strain compatibility for entire history of nominal flexural capacity

Cited by 9 publications

References 12 publications

An analytical model computing the flexural strength and performance of the concrete columns confined by both transverse reinforcements and steel sections

An analytical model computing the flexural strength and performance of the concrete columns confined by both transverse reinforcements and steel sections

Steel beam–column joint with discontinuous vertical reinforcing bars

Experimental and numerical study of the flexural capacity of reinforced concrete Vierendeel beams

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