Behavior of Unbonded, Post- Tensioned, Precast Concrete Connections with Different Percentages of Mild Steel Reinforcement

Özden, Şevket; Ertas, Onur

doi:10.15554/pcij.03012007.32.44

Cited by 45 publications

(22 citation statements)

References 15 publications

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“…A satisfactory seismic resistant precast joint must be able to fulfill the capacity of good energy dissipation, ductility, stiffness and ultimate strength. Among the discussed and presented types of joints for ductile precast concrete frame for earthquake resistant structure, the least recommended connection is through field welding as specified by Ozden and Ertas (2007) and Englekirk (1996). The main reason behind the unfavorable of welding is that field welding is often pricey and can create adverse results when the effects of welded regions are not thoroughly considered by the engineers, such as the additional forces caused by volume changes or eccentric temporary (or construction) loading (PCI Connection Details Committee, 2008).…”

Section: Resultsmentioning

confidence: 99%

“…This proved that the amount of shear reinforcement provided in the joint as specified in the codes could be reduced. In other related research by Ozden and Ertas (2007), it was found out that the optimum amount of mild steel reinforcement that would best satisfied the connection's flexural capacity would be 20-30%.…”

Section: Hybrid Post-tensioning Frame Connectionmentioning

confidence: 98%

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Performance of IBS Precast Concrete Beam-Column Connections Under Earthquake Effects: A Literature Review

Yee¹

2011

American Journal of Engineering and Applied Sciences

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Problem statement: Despite demonstrating rather much benefits comparing to the conventional cast-in-place construction, the acceptance level of precast concrete building is still reportedly low in Malaysia. The implication imposed by stricter seismic design provisions would only worsen the matter. Approach: The main objective of this study was to identify the most appropriate type of beam-column connections to be introduced to precast concrete industry, particularly for regions of low to moderate seismicity. Hence, this study presented a comprehensive literature overview of the findings from studies conducted to analyze and investigate the behavior of precast concrete systems assembled with typical connections or joints under simulated earthquake loading. Results: The seismic performance of precast concrete structure very much depended on the ductility capacity of the connectors jointing each precast components, especially at critical joints such as the beam-to-column connections. It was learnt from the review that (1) hybrid post-tensioned beam-column connection and (2) Dywidag Ductile Connector® were among the most widely used connectors for precast construction in seismic prone regions. Conclusion: Future refinement and research could be carried out in order to optimize these connections to be used in low seismicity regions. Proposed connection type should be practical and well-accepted to avoid further impediment of the precast system.

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Section: Resultsmentioning

confidence: 99%

Section: Hybrid Post-tensioning Frame Connectionmentioning

confidence: 98%

Performance of IBS Precast Concrete Beam-Column Connections Under Earthquake Effects: A Literature Review

Yee¹

2011

American Journal of Engineering and Applied Sciences

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“…Ozen, 2007 [14] five low cyclic reversed loading tests on connections with mixed connections were carried out in 2007. The prestressing tendon is located at half of the height of the beam, and the non prestressed steel bars are respectively arranged at the top of the beam and the bottom of the beam.…”

Section: Other Studiesmentioning

confidence: 99%

Study on Prestressed Fabricated Connections

Hu¹

2017

Proceedings of the 2017 6th International Conference on Measurement, Instrumentation and Automation (ICMIA 2017)

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Abstract. Compared with the traditional frame structure, the prestressed prefabricated frame structure has many advantages, of which the mechanical performance of the beam column connection is very important. In this paper, the present research on prestressed fabricated connections at home and abroad is expounded. The research results of fabricated connections at home and abroad are summarized in terms of construction; mechanical performance and engineering practicability are summarized. Finally, it is pointed out of the problems existing in the practical application of prestressed fabricated connections and the future research direction, which will provide reference for other researchers.

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“…Extensive investigations have validated that PT RC beam-column joints [3][4][5][6][7][8][9][10] and column (pier)-foundation joints [11][12][13][14] have excellent self-centering ability with little residual deformation under quasistatic cyclic loading. Many ED devices have been developed, ranging from internal mild steel (MS) rebars [3][4][5]8] to external dampers mounted at joints, which are easy to replace after failure, such as MS dampers [7,9,12,13], friction dampers [6,10], and angle steels [15,16].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Seismic Performance of Bidirectional Self-Centering Reinforced Concrete Frame Structures by Shaking Table Tests

Wang

Mao

Xie

2020

Shock and Vibration

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This paper presents an experimental study on the seismic performance of a bidirectional self-centering reinforced concrete (RC) frame structure. In the structure, the column-base joints, which were installed with external mild steel (MS) dampers, could uplift freely and the beam-column joints could open effectively under earthquake excitations. Angle steels and MS dampers were installed at the beam-column joints in the structural X and Y directions, respectively. During the gap opening of the joints, unbonded posttensioned (PT) steel wires, which passed through the plastic ducts inserted in the RC beams and columns, provided the structure with the ability to return to pre-earthquake positions, and the yielding MS dampers and angle steels dissipated the seismic energy. A 1/2-scale two-story model structure was designed and constructed. Shaking table tests were performed on the structure under four different types of earthquake excitations with increasing seismic hazard levels. The test results indicated that the self-centering RC frames installed in both the directions showed satisfactory seismic performance, with only slight damage to the main structure after extreme earthquakes. The natural frequencies of the self-centering frames installed in both the directions degraded progressively, mainly because of the prestress loss of the PT steel wires and the yielding of the MS dampers. The structure showed desirable self-centering ability with very small residual deformation under ground motions of all hazard levels. The structural deformation was mainly concentrated at the column-base and beam-column joints, and hence, damage to the concrete beams and columns was considerably alleviated. In addition, the residual gap opening of the joints was minimal.

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Behavior of Unbonded, Post- Tensioned, Precast Concrete Connections with Different Percentages of Mild Steel Reinforcement

Cited by 45 publications

References 15 publications

Performance of IBS Precast Concrete Beam-Column Connections Under Earthquake Effects: A Literature Review

Performance of IBS Precast Concrete Beam-Column Connections Under Earthquake Effects: A Literature Review

Study on Prestressed Fabricated Connections

Investigation on Seismic Performance of Bidirectional Self-Centering Reinforced Concrete Frame Structures by Shaking Table Tests

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