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Steel and Composite Structures Volume 50, Number 6, March 25 2024 , pages 627-641 DOI: https://doi.org/10.12989/scs.2024.50.6.627 |
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Behavior of simple precast high-strength concrete beams connected in the maximum bending moment zone using steel extended endplate connections |
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Magdy I. Salama, Jong Wan Hu, Ahmed Almaadawy, Ahmed Hamoda, Basem O. Rageh and Galal Elsamak
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| Abstract | ||
| This paper presents an experimental and numerical study to investigate the behavior of the precast segmental concrete beams (PSCBs) utilizing high-strength concrete (HSC) connected in the zone of the maximum bending moment using steel extended endplate connections (EECs). The experimental study consisted of five beams as follows: The first beam was the control beam for comparison, which was an unconnected one-piece beam made of HSC. The other four other beams consisted of two identical pieces of precast concrete. An important point to be noted is that at the end of each piece, a steel plate was used with a thickness of 10 mm. Moreover, this steel plate was welded to the lower and upper reinforcing bars of the beam. Furthermore, the steel plate was made to connect the two pieces using the technique of EECs. Several variables were taken in these four beams, whether from the shape of the connection or enhancing the behavior of the connection using the posttensioning technique. EECs without stiffeners were used for some of the tested beams. The behavior of these connections was improved using stiffeners and shear bolts. To get accurate results, a comparison was made between the behaviors of the five beams. Another important point to be noted is that Abaqus and SAP2000 programs were used to investigate the behavior of PSCBs and to ensure the accuracy of the modeling process which showed a good agreement with the experimental results. Additionally, the simplified modeling using SAP2000 was able to model the nonlinear behavior of PSCBs connected using steel EECs. It was found that the steel pre-tensioned bolted EECs, reinforced with steel stiffeners and shear anchors, could be used to connect the precast HSC segmental beams via the internal pre-stressing technique. | ||
| Key Words | ||
| extended endplate connections; finite element analysis; high-strength concrete; internal pre-stressing; moment connections; precast segmental beams | ||
| Address | ||
| Magdy I. Salama:Department of Civil Engineering, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh 33511, Egypt Jong Wan Hu:1)Department of Civil and Environmental Engineering, Incheon National University, Incheon 22012, South Korea 2)Incheon Disaster Prevention Research Center, Incheon National University, Incheon 22012, South Korea Ahmed Almaadawy:Department of Civil Engineering, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh 33511, Egypt Ahmed Hamoda:Department of Civil Engineering, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh 33511, Egypt Basem O. Rageh:Civil Engineering Department., Delta Higher Institute for Engineering and Technology, Mansoura 35511, Egypt Galal Elsamak:1)Department of Civil Engineering, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh 33511, Egypt 2)Civil Engineering Department., Delta Higher Institute for Engineering and Technology, Mansoura 35511, Egypt | ||