while designing structures to Eurocode 1998( seismic design) the normalized axial load( Ned/fcd*b*h, where Ned is Axial load, fcd is design concrete strength, b and h are cross sectional dimensions of column) is limited to 0.65 and 0.55 for medium and high class ductility structures respectively.
What is not clear is, the axial load(Ned) should it be taken from factored gravity load combination(1.35Gk+1.5Qk) or seismic load combination( Gk+(phi)Qk+Ved(seismic load))?
Please clarify this for me.
It shall be taken from the seismic load combination, as the limitation is for the seismic situation. Of course you should seek the worse case for the seismic action which changes sign.
Dear Ephrem Beyene
Please check the following worked examples. Hopefully, they can help you.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwjp6aiD7cPfAhWMOSwKHd2jBEAQFjAAegQIChAC&url=https%3A%2F%2Feurocodes.jrc.ec.europa.eu%2Fdoc%2FWS_335%2Freport%2FEC8_Seismic_Design_of_Buildings-Worked_examples.pdf&usg=AOvVaw0AK5OBT1wVjvGZ8FKqnJbS
Best Regards
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