Abstract
When designing seismic resistance for reinforced concrete buildings with medium ductility class (DCM) according to TCVN 9386:2012 the load bearing structures are to be designed to meet the required ductilities. The design of ductile members is quite complicated [2] and the amount of reinforcement provided for seismic members is considerable. Even so, TCVN 9386:2012 also allows to ignore the contribution of some members to the global seismic load-bearing structural system (that are secondary seismic members) when the remaining members (primary seismic members) are sufficient to ensure the safety and stability of the building. This paper presents some basic principles of the selection, the modeling methods and the design principles of primary and secondary seismic members in reinforced concrete buildings.
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