Seismic retrofit of substandard beam-column joint by planar joint expansion

Chaimahawan, Preeda; Pimanmas, Amorn

doi:10.1617/s11527-008-9393-7

Cited by 23 publications

(7 citation statements)

References 6 publications

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“…Furthermore, unlike concrete jacketing, the perforation in slab is not required in this method. Experimental works [15] confirmed the feasibility of this method to upgrade the joint shear strength. However, it should be cautioned that the joint enlargement may shorten the length of beams and columns, making them prone to shear failure.…”

Section: Introductionmentioning

confidence: 60%

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Shear strength of beam–column joint with enlarged joint area

Pimanmas

Chaimahawan

2010

Engineering Structures

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Section: Introductionmentioning

confidence: 60%

“…The authors presented the joint strengthening method using joint enlargement technique [15]. The existing joint in the frame is enlarged by cast in situ concrete to increase the joint size.…”

Section: Introductionmentioning

confidence: 99%

Shear strength of beam–column joint with enlarged joint area

Pimanmas

Chaimahawan

2010

Engineering Structures

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“…In consideration of the economic situation and technical level of developing countries, strengthening of beam‐column joints by concrete jacketing, local enlargement of joint, or installing additional structural elements (ie, RC wing walls), which use conventional materials such as concrete and reinforcement, are likely to be practical solution. However, these strengthening methods were developed for improving shear resistance of the joints, not for improving anchorage of beam rebar in joint.…”

Section: Introductionmentioning

confidence: 99%

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

Wardi

Sanada

Saha

et al. 2020

Earthq Engng Struct Dyn

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In recent earthquakes in developing countries, severe damage was observed on reinforced concrete buildings. This study focuses on exterior beamcolumn joints with substandard beam rebar anchorage and seismic strengthening by installing wing walls. First, a series of experiments was conducted to investigate the seismic behavior of exterior joints with substandard beam rebar anchorage representing typical Bangladeshi buildings.Two 0.7-scaled exterior joint specimens were tested, and these specimens showed beam rebar anchorage failure and/or joint shear failure. Prior to strengthening of the joint, a series of pullout tests was conducted on postinstalled bonded anchors in low-strength concrete for strengthening design.Then, an experiment was performed to apply the strengthening method by wing walls to one of the exterior joint specimens to improve the integrity, and this method was intended to prevent the failure of beam rebar anchorage. The strengthening method is proposed to extend the development length of beam longitudinal bars by considering the embedment length along the wing walls. The test results verified the effectiveness and applicability of the proposed strengthening method to upgrade exterior RC beamcolumn joints with deficient beam rebar anchorage. K E Y W O R D Sanchorage failure, developing country, low-strength concrete, reinforced concrete, seismic strengthening, substandard structure

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“…This method is most suited for implemented in cases where the shear capacity of the joint is inadequate. For frames having inadequate lateral stiffness, potentially resulting in a column sway mechanism, alternative suitable retrofit methods should be considered, such as the installation of supplementary shear walls or seismic retrofit of infill walls …”

Section: Introductionmentioning

confidence: 99%

Effect of different size of joint enlargement on seismic behavior of gravity load designed RC beam‐column connections

Shafaei

Nezami

2019

Structural Design Tall Build

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Summary Effect of different size of planer joint enlargement as a noninvasive and practical strategy for seismic retrofit of gravity load designed external reinforced concrete beam‐column connections was experimentally investigated. The joint region was enlarged using steel angles that are mounted using prestressed cross‐ties. Reverse cyclic load tests on five half‐scale control and retrofitted external RC beam‐column connections were conducted. Three different size of planer joint enlargement being 180, 140, and 90 mm were considered for retrofitted specimens. The performance of the retrofitted specimens is compared with that of the control gravity load designed beam‐column connections, in terms of load–displacement hysteresis curve, energy dissipation and ductility capacities, and global strength and stiffness degradation behavior. The experimental results showed that increasing the size of planer joint enlargement significantly enhances the seismic capacity of the retrofitted connections, in terms of strength, stiffness, energy dissipation, and ductility capacity and also planer joint enlargement can relocate beam plastic hinges to outside the joint panel.

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Seismic retrofit of substandard beam-column joint by planar joint expansion

Cited by 23 publications

References 6 publications

Shear strength of beam–column joint with enlarged joint area

Shear strength of beam–column joint with enlarged joint area

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

Effect of different size of joint enlargement on seismic behavior of gravity load designed RC beam‐column connections

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