Improving integrity of RC beam‐column joints with deficient beam rebar anchorage

Wardi, Syafri; Sanada, Yasushi; Saha, Nandita; Takahashi, Susumu

doi:10.1002/eqe.3229

Cited by 6 publications

(8 citation statements)

References 14 publications

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“…Furthermore, the behavior of RC flat plate‐column connections constructed using low‐strength concrete applied to the proposed strengthening method was investigated. Previously, this wing wall installation scheme was applied to substandard beam‐column joints, and an improvement in the performance of the connections under seismic loading conditions was verified 22‐24 . As mentioned in the literature, the application of RC wing walls in developing countries is relatively easy and cost‐effective.…”

Section: Introductionmentioning

confidence: 84%

“…Figure 3B presents the result of the compressive strength test performed on a drilled concrete core obtained from an existing building in Dhaka city. As similar low‐strength concrete with a compressive strength lower than 10 N/mm 2 is common, 24,25 a concrete strength of approximately 6–7 N/mm 2 was used to design the test specimens, as shown in Figure 3B.…”

Section: Target Building and Flat Plate Jointmentioning

confidence: 99%

“…Previously, this wing wall installation scheme was applied to substandard beam-column joints, and an improvement in the performance of the connections under seismic loading conditions was verified. [22][23][24] As mentioned in the literature, the application of RC wing walls in developing countries is relatively easy and cost-effective. Figure 2 shows a typical flat plate-column connection strengthened using RC wing walls.…”

Section: Introductionmentioning

confidence: 99%

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Strengthening seismically vulnerable reinforced concrete flat plate‐column connections by installing wing walls

Samdani

Takahashi

Yoon

et al. 2021

Japan Architectural Review

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This study emphasizes a new strengthening scheme for seismically vulnerable flat plate-column connections in existing structures. An experimental investigation on a series of three half-scaled interior plate-column connections was conducted to explore the effectiveness of the proposed seismic strengthening method using postinstalled RC wing walls and to analyze the punching shear capacity of the connections. This study focuses on typical existing flat plate structures constructed using low-strength concrete in Bangladesh. Two of the three specimens had wing walls employed in two principal directions, that is, along the loading direction and orthogonal direction, while another specimen was tested without wing walls and served as a control specimen for comparisons between the cases with and without strengthening. Static cyclic vertical displacements with increasing amplitude were applied to the ends of the slabs to represent interstory drift under seismic action. Both strengthened specimens showed higher resistance to punching shear failure. Thus, the test results experimentally verified that installing RC wing walls is a feasible method to upgrade flat plate-column connections, including those constructed using low-strength concrete, to prevent collapse under seismic action.

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Section: Introductionmentioning

confidence: 84%

Section: Target Building and Flat Plate Jointmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strengthening seismically vulnerable reinforced concrete flat plate‐column connections by installing wing walls

Samdani

Takahashi

Yoon

et al. 2021

Japan Architectural Review

Self Cite

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“…The beam-column joints that do not satisfy the requirements of the standard for seismic detailing often caused severe damage or collapse of RC buildings, as observed in recent earthquakes in developing countries [1]- [3]. Figure 1 shows a collapsed RC building with failure on the beamcolumn joint, in which the joint area had no shear reinforcement.…”

Section: Introductionmentioning

confidence: 99%

“…However, this assumption may mislead the analysis results in the case of substandard beam-column joints, because the failure of the joint may occur as confirmed in the literature of experimental studies (e.g. [1], [2], [10]- [12]) and an experimental study by one of the authors [3].…”

Section: Introductionmentioning

confidence: 99%

Pushover Analysis of Rc Frames With Substandard Beam-Column Joints

2023

GEOMATE

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Recent earthquakes in developing countries showed that the failure of substandard beamcolumn joints often contributes to heavy damage or collapse of reinforced concrete (RC) buildings. Static nonlinear pushover analysis is one of the methods to evaluate the seismic capacity of RC frames/buildings. However, the pushover analysis commonly neglects the failure at beam-column joints because of the complex behavior. In this study, a nonlinear pushover analysis procedure considering the failure of exterior beamcolumn joints without shear reinforcement is presented. Specifically, the performance limit is assumed as a point at the failure of beam-column joints from the literature of experimental study and a simplified backbone of joint shear stress-strain response. The proposed analysis procedure was applied to one RC frame with substandard beam-column joints representing a collapsed building due to a recent earthquake in Indonesia. The proposed analysis procedure was applicable to estimate the seismic capacity of RC frames considering the failure of exterior beam-column joints.

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Mechanical behavior of semi‐grouting sleeve and steel bar connection

Bai

Liang

et al. 2023

Structural Concrete

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A series of pull‐out tests were conducted on semi‐grouting sleeve and steel bar connections to investigate the mechanical behavior of the connectors. Taking the steel bar diameter, anchorage length, and grouting material strength as the parameters. The test results showed that when the anchorage length was small and the grouting material strength was low, sufficient anchorage strength cannot be provided, specimens were subjected to bond slip failure, which belongs to the brittle failure. When the anchorage strength between the steel bar and the grouting material was sufficient, the steel bar breaking occurred on the specimens, which belongs to the ductile failure. Then, the semi‐grouting sleeve and steel bar connection was modeled by finite element software, and the bond slip between the steel bar and grouting material was simulated by COMBIN39 element. The results indicated that the failure mode of the specimen obtained by finite element simulation was the same as the test result. The ultimate bearing capacity of the specimen was highly similar to the test result, which verified the feasibility of the modeling method in this paper. Next, the number of specimens and parameter levels were increased through finite element modeling, and the influences of steel bar diameter, anchorage strength, and grouting material strength on the ultimate bearing capacity of semi‐grouting sleeve and steel bar connections were analyzed. The results testified that the ultimate bearing capacity of the specimen increased with the increase of steel bar diameter. In a certain range, the ultimate bearing capacity of the specimen increased with the raising of anchorage length and grouting material strength. While the anchorage length increased, the ultimate bearing capacity of the specimen did not necessarily increase because of the uneven distribution of stress. The steel bar diameter had the most significant influence on the ultimate bearing capacity of the specimen, while the grouting material strength had the most negligible impact, that was, increasing the steel bar diameter is the most effective method to improve the ultimate bearing capacity of the specimen. Finally, according to the results of finite element analysis, the calculation method of ultimate bearing capacity with different failure modes was obtained, and it has been proved to be effective and accurate by the comparison of calculated results and test results. The results of this paper have great significance for improving the calculation theory and design method of relevant engineering.

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Improving integrity of RC beam‐column joints with deficient beam rebar anchorage

Cited by 6 publications

References 14 publications

Strengthening seismically vulnerable reinforced concrete flat plate‐column connections by installing wing walls

Strengthening seismically vulnerable reinforced concrete flat plate‐column connections by installing wing walls

Pushover Analysis of Rc Frames With Substandard Beam-Column Joints

Mechanical behavior of semi‐grouting sleeve and steel bar connection

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