Analysis and design of Semi-rigid frames – Theory and Practice

Date, time & venue
2017-10-24;6:00 pm – 6:30 pm (Refreshment), 6:30 pm – 7:30 pm (Talk);Chan Yat Mei Sophie Room – 9/F


Speakers: Ir Professor S.L. Chan, Chair Professor in Computational Structural Engineering at The Hong Kong Polytechnic University.



Second-order Direct analysis or simply Direct Analysis is becoming popular for design of steel structures since its introduction in various codes such as the Eurocode-3-1 2005 (chapter 5), Hong Kong Steel Code 2005 and 2011 (chapter 6) and AISC-specifications for structural steel buildings-2016 (Chapter C) which further puts the traditional effective length method to Appendix 7 of lower priority. However, engineers still commonly assume joints as rigid or pinned and elaborate on detailing and designing joints to fulfill the requirements for infinite or zero stiffness. The effort is noticed to be unnecessary, costly and sometimes unachievable as all practical joints are semi-rigid with a certain degree of flexibility. This lecture introduces a new technique for design of semi-rigid steel frames of higher accuracy in computation for moments and forces and with saving of cost and efforts in fabricating joints for full or null rigidity. Further, it was observed that non-preload bolt connections with unavoidable slips may introduce a larger P-D moment that checking of moment capacity of joints alone may be inadequate in some structures like portal frames, because the additional sway due to joint slippage produces a larger lateral deflection and subsequently a lower elastic critical load factor.


About Speaker:

Professor Chan is the chief and founding editor of the SCI-e international journals “Advanced Steel Construction”, “Steel and Composite Structures (2002-2005)” and the regional editor of “International Journal of Applied Mechanics and Engineering”, a member of editorial boards in 7 other journals, the principal consultant of design codes for steel and glass structures in Hong Kong and an adjunct professor at the Southeast University in Nanjing, Harbin Institute of Technology in Harbin and Tongji University in Shanghai. In conjunction with a research team of the Tongji University, he received the first class award for research by the Education Ministry in the Mainland China in 2008, research awards by the Structural and the Geotechnical Divisions of HKIE in 2016 and served as the Chairman of the Structural Division HKIE in 2013 and incumbent Deputy Chairman of Fire Division HKIE.


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