Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
Earthquakes and Structures Volume 19, Number 5, November 2020 , pages 361-377 DOI: https://doi.org/10.12989/eas.2020.19.5.361 |
|
|
Application of ultra-high performance fiber reinforced concrete for retrofitting the damaged exterior reinforced concrete beam-column joints |
||
Mohammed A. Al-Osta, Muhammad I. Khan, Ashraf A. Bahraq and Shi-Yu Xu
|
||
Abstract | ||
In the present research work, the effectiveness and the efficiency of a retrofitting approach using a layer of ultra-high performance fiber reinforced concrete (UHPFRC) jacket for damaged substandard exterior beam-column joints (BCJs) is experimentally investigated. The main objective of this study is to rehabilitate the already damaged BCJs to meet the serviceability requirements without compromising safety. According to the proposed strengthening technique, a chipped surface, lightly brushed with a dry condition was selected for making a successful bond between normal concrete substrate surface (NCSS) and UHPFRC. Then a fresh UHPFRC jacket with a thickness of 30 mm was cast around the damaged specimens. The entire test matrix was comprised of three 1/3 scale damaged exterior BCJs with a different column axial load (CAL). These specimens were repaired with UHPFRC and retested under monotonic loading. Based on the experimental results, repaired specimens showed an excellent performance in terms of their load-displacement response, maximum strength, displacement ductility, initial stiffness, secant stiffness and energy dissipation capacity when compared with the corresponding values registered when these specimens were tested in their virgin state. This rehabilitative intervention not only restored the strength, stiffness, ductility and energy dissipation capacity of severely damaged specimens but also improved their performance. | ||
Key Words | ||
repairing; UHPFRC jacketing; beam-column connection; energy dissipation; experiment | ||
Address | ||
Mohammed A. Al-Osta, Khan, Ashraf A :Dept. of Civil and Environmental Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia Muhammad I. Khan and Shi-Yu Xu:Dept. of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong SAR | ||