Technical Seminar on Behavior of externally confined UHSCFST columns

Date, time & venue
2019-04-09;6:00 pm – 6:30 pm (Refreshment), 6:30 pm – 7:30 pm (Talk);Chan Yat Mei Sophie Room – 9/F


Speakers: Dr Johnny Ching Ming HO and Dr Mianheng LAI



Thanks to the larger and more continuous confining stress provided by hollow steel tube, ultra-high-strength concrete-filled-steel-tube (UHSCFST) columns are advocated rather than conventional transverse steel confined ultra-high-strength concrete in tall buildings’ column design. However, during elastic stage, de-bonding occurs as the Poisson’s ratio of steel is larger than that of concrete, whereas in post-elastic stage, confining stress, strength and ductility of concrete decrease as the steel tube buckles. Thus, composite action between steel and concrete cannot be fully developed. To overcome this problem, external steel confinement in the form of tie bars, rings and continuous spirals are proposed in this presentation to increase the confinement effect of UHSCFST columns. A series of uni-axial compression test has been conducted to study the behaviour of externally confined UHSCFST columns. Results showed that the proposed confining schemes can effectively improve the strength, elastic stiffness and ductility of UHSCFST columns. Moreover, rings and spirals are more effective than tie bars. Lastly, a theoretical stress-strain model was used to predict the ultimate load and axial load-strain behaviour of the tested columns, in which excellent agreement between the theoretical and experimental results has been obtained. Results of this pilot study are very instructive to the design of innovative composite column and shear wall in the future.


About the Speaker:

Dr Johnny Ching Ming HO is a Professor in the School of Civil Engineering, Guangzhou University PRC. Before joining the university in 2018, he worked as a Senior Lecturer in the University of Queensland in 2013-2018 and an Assistant Professor in The University of Hong Kong in 2007-2013. Practically, Dr Ho had about 5 years’ of experience working in both Hong Kong and Brisbane offices of Arup on some large scale infrastructure projects such as The Stonecutters Bridge in Hong Kong and the Ipswich Motorway Upgrade (Wacol to Darra) in Brisbane. Dr Ho’s research interests are on mix design of high-performance concrete with multi-sized fillers, rheology of cement paste and mortar, as well as their application in concrete-filled-steel-tube columns.


Dr. Mianheng Lai is an Associate Professor in the School of Civil Engineering, Guangzhou University PRC. Before, joining the university in 2018, he worked as a Chief Project Manager in Country Garden Holdings from 2015 to 2018 in Zhaoqing and Foshan, Guangdong, China. Dr. Lai received his PhD in 2015, supervised by Dr. Johnny Ho and Dr. HJ Pam. Dr. Lai’s research interests are on behavior of high-performance concrete-filled-steel-tube columns, seismic/fire behavior of composite shear walls and concrete-steel-timber composite structures.


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