Analysis and Design of Semi-rigid Joints for Steel Frames

Date, time & venue
2018-01-23;6:00 pm – 6:30 pm (Refreshment), 6:30 pm – 7:30 pm (Talk);Chan Yat Mei Sophie Room – 9/F


Speakers: Prof. Daniel S.H. Lo, The University of Hong Kong



In practice, extensive efforts are made either to strengthen a joint just to satisfy the rigid joint assumption or to remove the constraints to allow free rotation in order to achieve pinned joint behaviour. Both of these actions are indeed unnecessary and uneconomical if we could account for the stiffness and the strength of the joints in a frame such that the member capacity and the true joint behaviours are properly assessed. In this seminar, the relationships between the rotational stiffness of steel joints and the deflection of portal frames under a range of load cases and support conditions will be discussed. The results justify the merits of considering semi-rigidity in the design of steel connections. Moreover, the cost-effectiveness and environmental merits in designing semi-rigid joints to EN 1993 1-8(2005) is demonstrated by a practical adoption of a patented prefabricated structural system developed. This advanced and practical application of nonlinear analysis coupled with the concept of semi-rigid connections appears to be quite innovative and would have a significant impact to the design technology of steel structures in the coming years.


About Speaker:

Graduated with a B.Sc(Eng-Civil) degree at the University of Hong Kong, Prof. Lo received a Doc-Ing degree from l’Ecole Nationale des Ponts et Chaussees of Paris in 1986, and is a professor at the Department of Civil Engineering, HKU, since 2000. His main research areas are finite element technology, mesh generation, large deformation and stability analysis with applications to structural problems and engineering mechanics in general. Recently, he turns his attention to high-strength concrete under fire and the analysis and design of semi-rigid joint connections of steel frames. Prof. Lo has published more than 175 international refereed journal papers and two books, “Finite Element Implementation”, Blackwell Science 1996 and “Finite Element Mesh Generation”, CRC Press in 2015.


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