Synopsis:

Fiber reinforced polymer (FRP) confined concrete is widely used in engineering applications, including strengthening and repair of old structures and construction of new structures. It can exhibit significantly enhanced capacity and ductility performance under compressive loadings compared with unconfined concrete. However, the effectiveness of FRP-confined high strength concrete (HSC) is not as good as that of FRP-confined normal strength concrete (NSC). Due to the high brittleness of HSC, localized cracks may occur and result in FRP rupture at the corresponding locations. This research proposes a novel confined concrete composite column, which consists of an outer FRP tube, an inner HSC core as well as an engineered cementitious composite (ECC) ring between FRP tube and HSC core. With the excellent tensile and cracking behavior, ECC ring is used to redistribute the hoop stress and strain from HSC core to FRP tube. FRP-ECC-HSC composite columns with different HSC core strengths and ECC ring thicknesses were tested under axial compression. It is found that the proposed novel column can achieve more uniform hoop strain distribution on the FRP tube, leading to the improved FRP confining efficiency and column deformability. Based on the obtained test results, design equations have also been developed to predict the ultimate conditions of the FRP-ECC-HSC composite column.

About the Speaker:

Dr Shuai Li is currently a Postdoctoral Fellow in Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University (PolyU). He obtained his Ph.D. in Structural Engineering from PolyU in 2022 and his bachelor’s and master’s degree both from Tianjin University in 2016 and 2019, respectively. Dr Li’s research interests include FRP-steel-concrete composite structures, high performance constructional materials and innovative structural forms. He has been awarded the HKIE Commendation Merit Award 2023 based on this research project (https://research.polyu.edu.hk/en/publications/experimental-investigation-on-axial-compressive-behavior-of-novel). As Co-Inventor, a Chinese Invention Patent (Patent No. ZL202110760444.5) has also been granted.

Registration:

Please use the link below for registration. The registration deadline is 31 March 2024. A MS team link will be forwarded to your registered email if your application is successful after the registration deadline.

https://docs.google.com/forms/d/e/1FAIpQLSe4sZa77NrButGw9ITpPH3W4o9HiadtWzIQ8C6d3ZiX OD3HNw/viewform?usp=sf_link

CPD certificate:

Upon the completion of the seminar, CPD certificate will be issued in e-copy through the registered email address.

For enquiries, please contact Ir Dr Simon Wong at 21761412 (email: hkiestructuraldivision@gmail.com). For updated information, please browse http://st.hkie.org.hk/.

Submissions for the Best Reporter Award are invited. Report must be submitted to ceshfw@thei.edu.hk within two weeks after the seminar.