06-10-2010, 10:24 AM
You were citing the Eurocode 8. Could you please indicate the articles and the paragraphs in the code that infer the statements “....If you do a non-linear dynamic analysis you will see that hinges can appear in columns. If this is the case the overall stability of the building is not jeopardized. Also, plastic hinges can form in the top story columns (the codes allow the situation?????? ). [The formation of plastic hinges in columns will lead to story mechanisms (any form of brittle failure is excluded).......”
Comment:-
In the non-linear analysis, hinges could appear anywhere but you have to design against that which is most critical as such will lead to collapse. It is for this reason that the code require that you should not allow a situation in which hinges form in the column as this will lead to the condition of brittle collapse.
Please remember that the analysis of a structure is different from code requirements.
Again, taking this reasoning into the design of primary and secondary members for seismic design (which is a different topic) detract from the original post “.....To avoid catastrophic failure or collapse (brittle collapse), it is required that the hinges (at the plastic stage) form on the beams, rather than on the columns. For this reason, the codes required the designers to provide a margin of security on the strength of the column over that of the beam......”
Please note that I did not mean seismic loading/design. I meant the general requirement of the code as cited inter-alias.
Regards
Teddy
Comment:-
In the non-linear analysis, hinges could appear anywhere but you have to design against that which is most critical as such will lead to collapse. It is for this reason that the code require that you should not allow a situation in which hinges form in the column as this will lead to the condition of brittle collapse.
Please remember that the analysis of a structure is different from code requirements.
Again, taking this reasoning into the design of primary and secondary members for seismic design (which is a different topic) detract from the original post “.....To avoid catastrophic failure or collapse (brittle collapse), it is required that the hinges (at the plastic stage) form on the beams, rather than on the columns. For this reason, the codes required the designers to provide a margin of security on the strength of the column over that of the beam......”
Please note that I did not mean seismic loading/design. I meant the general requirement of the code as cited inter-alias.
Regards
Teddy