Regarding to Ch4-RC-01, why damping is not defined neither global nor local?
In fact, I have defined damping for first and second periods with respect of Rayleigh definition in IDA and the spectral acceleration for collapse limit state are really so large and unreasonable. Without damping everything seems to be normal.
Damping
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seismosoft
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- Joined: 06 Jul 2007, 04:55
Re: Damping
Viscous damping is not defined, because usually its significance is negligible with respect to the hysteretic damping in the highly inelatic range.
Further, in the reference of this example: Pinto A., Verzeletti G., Molina F.J., Varum H., Pinho R., Coelho E. [1999]. #8220;Pseudo-Dynamic Tests on Non-Seismic Resisting RC Frames (Bare and Selective Retrofit Frames)#8221;. EUR Report, Joint Research Centre, Ispra, Italy, pg.43 it is mentioned that #8220;Typically, the viscous damping matrix C is considered null in Pseudo-dynamic testing.#8221;
Seismosoft Support
Further, in the reference of this example: Pinto A., Verzeletti G., Molina F.J., Varum H., Pinho R., Coelho E. [1999]. #8220;Pseudo-Dynamic Tests on Non-Seismic Resisting RC Frames (Bare and Selective Retrofit Frames)#8221;. EUR Report, Joint Research Centre, Ispra, Italy, pg.43 it is mentioned that #8220;Typically, the viscous damping matrix C is considered null in Pseudo-dynamic testing.#8221;
Seismosoft Support
Re: Damping
saeed_nozhati,
Over the recent years, a number of researchers have demonstrated that the indiscriminate use of Rayleigh damping can lead to very erroneous results.
Do refer to the many publications on this subject that are listed in SeismoStruct's Help System/User Manual.
Rui
Over the recent years, a number of researchers have demonstrated that the indiscriminate use of Rayleigh damping can lead to very erroneous results.
Do refer to the many publications on this subject that are listed in SeismoStruct's Help System/User Manual.
Rui