CSI ETABS - 21 Time History Analysis | Part 2

[@civilmdc]

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[@BashirAhmed-jo4zq]

Learning alot from yuor videos
Thanks Buddy

[@زينبقحطانحسنسعيد]

Thank you for this video. I have questions when used nonlinear time history analysis by direct integration method this massage shows in result menu ( NON-ZERO TIME-HISTORY FUNCTION VALUES WILL BE IGNORED AT START OF LOAD CASE). what I'll do to solve this?

[@Engr_Zeeshan]

sir, you used time of 30 seconds, kindly guide from where in the earthquake records it is mentioned?
also how to use the sine function

[@ToobaForTheStrangers-ar]

Thank you so much for this video.
If we are performing a non linear time history analysis, will the steps be the same regarding the scale factor and the scaling of base shear values due to the non linear time history load cases with the base shear value due to static seismic loads?

[@civilmdc]

Yes

[@naiba996]

in Time History Analysis, some frames fail again, does it means in Time History Analysis, we need to provide stronger frames in this model? compared to response spectrum analysis and equivalent later load analysis.

[@hidupsantuy9775]

hello sir, when it comes to TH X load case, my FY is zero , and when it TH Y load case my FX is zero?
what should i do? (base reaction)

[@civilmdc]

When earthquake acts in the X direction purely then definitely their reactions in the y direction will be zero.

[@hidupsantuy9775]

@@civilmdc what can i do so its like yours? ty sir

[@muhammadabbaskhan9885]

I performed LTHA analysis but my Base Shear values are much larger than ELF method. I spectrally matched the ground motions

[@ch_doodles]

Is it normal to have THA be larger than ELF?

[@muhammadabbaskhan9885]

@@ch_doodles it depends upon which method you used. Non-linear Time history results in higher base shear than ELF. while linear time history can vary for method to method. unscaled linear response history results in lower value while linear direct integration results in an equivalent or slightly more value than of ELF.

[@ch_doodles]

@@muhammadabbaskhan9885 I am trying a nonlinear FNA, I only use 9.81 as scale factor in time history load case but the base reaction are way larger than ELF, around 3-4times larger. Is it because I did not use IG/R?

[@muhammadabbaskhan9885]

@@ch_doodles IG/R are not used in NLTHA. No problem NLTHA results usually greater than ELF.

[@ch_doodles]

@@muhammadabbaskhan9885 okay, I was worried cause the difference was large so I was wondering I did something wrong. May I ask why IG/R is not applicable in NLTHA?

[@mdhisamuzzaman9922]

Thank you bro it was so much helpful jajkallah

[@civilmdc]

Welcome

[@emdadulhaque2435]

Assalamualaikum. Thank you very much. Do you have Nonlinear Time History Analysis Etabs Tutorials

[@thahiraputeri603]

waalaikumsalam🙏

[@shahkar_alam]

why you don't take U2 in TH-Y load case.

[@mamunhasan5176]

may be forgot

[@dharshini7483]

Thank you so much bro

[@priyankaparekh2387]

THANK YOU SIR