Seismic retrofit of beam–column joints using prestressing wire

Huang, Qunxian; Zixiong, Guo; Kuang, Jingming; Behnam, Hamdolah

doi:10.1680/jstbu.15.00109

Cited by 11 publications

(5 citation statements)

References 21 publications

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“…[16][17][18][19] The failure mode of the strengthened RC frame was bending failure, which avoided brittle failure of beam-column joints under strong earthquakes. 20,21 Relevant scholars had provided corresponding theories and calculation methods for the seismic performance of strengthened RC frame structures. Reinaldo et al 22 combined linear analysis and limit design of threedimensional stress fields for the design of concrete structures.…”

Section: Introductionmentioning

confidence: 99%

“…When the original RC frame and the strengthened member bore the external load together, the strengthened member could bear most of the earthquake action, which greatly reduced the load borne by the original frame 16–19 . The failure mode of the strengthened RC frame was bending failure, which avoided brittle failure of beam‐column joints under strong earthquakes 20,21 …”

Section: Introductionmentioning

confidence: 99%

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Analysis of the influence on structural seismic performance by the composite reinforcement method

Chu

et al. 2023

Structural Concrete

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This paper proposed three composite strengthening methods for repairing seismic‐damaged RC frames to restore their seismic capacity. Combined with the damage characteristics and failure mode of the frame under the earthquake action, the local strengthening of the column adopts the angle steel and gusset plate, and then the whole frame is strengthened by the inclined brace, the thin‐walled steel plate and the V‐shaped buckling restrained brace (BRB), respectively. Through the cyclic loading test, the main seismic indexes of the strengthened specimen, including hysteresis curve, skeleton curve, ductility, energy dissipation capacity, and stiffness degradation, are studied. The influence of different strengthening methods on the seismic performance of the seismic‐damaged specimens is analyzed. The results show that the seismic performance of strengthened specimens is significantly improved, and the bearing capacity, ductility, and energy dissipation capacity are increased by 2.58–5.57, 1.05–1.24, and 7.67–15.87 times, respectively. The thin‐walled steel plate shear wall and the inclined brace are destroyed at first during loading to effectively delay the premature destruction of the main frame. The composite strengthening method makes the original frame realize the failure mechanism of “strong joint weak member, strong column weak beam” under strong earthquake action. The strengthened specimen satisfies the seismic requirement and has good seismic performance. The seismic performance of the frame strengthened with the V‐shaped BRB is better than that of the other two strengthening methods. Based on the test date, the formula for calculating the shear‐bearing capacity of the beam end is presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the influence on structural seismic performance by the composite reinforcement method

Chu

et al. 2023

Structural Concrete

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“…Jacketing with concrete is one of the earliest techniques to be introduced and is the most common solution for local rehabilitation of nonseismically detailed beam‐column joints, with several research projects that investigated the viability of this technique having been reported . Enhancing the performance of deficient beam‐column joints through the use of various configurations of flat and corrugated steel plate jacketing has also been studied, with both concrete and steel jacketing having been shown to be effective in increasing strength, stiffness, and energy dissipation capacity of deficient joints. However, these rehabilitation techniques were found by Engindeniz et al to require extensive levels of detailing and to cause disruption of building occupancy.…”

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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“…The presented papers continue the tradition of this journal to provide results useful for the professional development of its readers. This issue contains papers that have passed the rigorous peer review procedure adopted by the journal and contribute to the areas of knowledge discussed in this editorial.The first paper presents the seismic retrofit of beam-column joints using pre-stressing wires (Huang et al, 2017). This paper highlights the improvements of the seismic performance and enhancements of the shear strength of beam-column joints with non-seismic design, as well as the shortcomings of traditional seismic retrofitting techniques for the joints.…”

mentioning

confidence: 99%

“…The first paper presents the seismic retrofit of beam-column joints using pre-stressing wires (Huang et al, 2017). This paper highlights the improvements of the seismic performance and enhancements of the shear strength of beam-column joints with non-seismic design, as well as the shortcomings of traditional seismic retrofitting techniques for the joints.…”

mentioning

confidence: 99%

Editorial

Hussain

2017

Proceedings of the Institution of Civil Engineers - Structures

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This issue of Structures and Buildings contains papers discussing the seismic retrofit of beam column joints using prestressing wires, the study of a hybrid structural damper for multi-seismic levels, strength reduction factors for wind and earthquake effects, column under-pinning joints with inclined steel bars and observer application in decentralized control of civil structures. The presented papers continue the tradition of this journal to provide results useful for the professional development of its readers. This issue contains papers that have passed the rigorous peer review procedure adopted by the journal and contribute to the areas of knowledge discussed in this editorial.The first paper presents the seismic retrofit of beam-column joints using pre-stressing wires (Huang et al., 2017). This paper highlights the improvements of the seismic performance and enhancements of the shear strength of beam-column joints with non-seismic design, as well as the shortcomings of traditional seismic retrofitting techniques for the joints. Six largescale interior beam-column joints were tested under reversed cyclic loading, where five were strengthened by the proposed technique and one was un-retrofitted as a control specimen. Particular emphasis was placed on the effects of the ratio of prestressed high-strength steel wires, prestressing level of wires and polymer grout layer. Test results showed that the joint shear capacity was increased significantly and cracks in beamcolumn joints were controlled effectively after retrofitting. All retrofitted joint specimens failed in a ductile mode of beam flexural failure, whereas the control specimen failed in a brittle mode of joint shear failure. In addition, the energy dissipation capacity as well as ductility of the retrofitted joint specimens was enhanced significantly.The second paper presents the hybrid structural damper for multi-seismic levels (Hosseini Hashemi and Moaddab, 2017). In this paper two dual-performance designs are introduced as alternatives to the standard steel-plate yielding and friction damper. The new devices are detailed and designed to absorb and dissipate seismic input energy at different levels of ground motion. Both systems are composed of a main fuse to dissipate energy at high-level drift demands encountered in severe earthquakes but also have an auxiliary fuse to control the responses at lower drift demands that normally occur in moderate earthquakes. Six specimens with different specifications were designed and tested. The experimental results prove the efficiency of the dampers at different levels of ground motion. In moderate-level ground motion intensities, the dual-performance characteristics of the dampers permit energy dissipation in the auxiliary fuse without disturbing the main fuse. In high-intensity ground motions, the main fuses are engaged with significant energy-dissipating capability. Moreover, significant enhancements were observed in the plastic rotation capacity of the dampers and the ductility provided.The third paper is ab...

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Seismic retrofit of beam–column joints using prestressing wire

Cited by 11 publications

References 21 publications

Analysis of the influence on structural seismic performance by the composite reinforcement method

Analysis of the influence on structural seismic performance by the composite reinforcement method

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

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