In the software of SeimoSignal, if we input the hisotory of acceleration, SeimoSignal could compute the overdamped inelastic spectrum and constant-ductility inelastic Spetrum. I am truely concerned about what hysteresis rules are used to creat overdamped inelastic spectrum and constant-ductility inelastic Spetrum. Thanks!
My Email:luyan726@126.com
About hysteresis rule
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seismosoft
- Posts: 1271
- Joined: 06 Jul 2007, 04:55
Re: About hysteresis rule
We do not really understand why you are "truly concerned".
In any case, we note that the computation of overdamped spectra does not require any hysteretic rule.
For inelastic spectra, an elasto-plastic with hardening model is employed.
Please do read the Help System and publications cited in the latter for further clarifications.
Seismosoft Support
In any case, we note that the computation of overdamped spectra does not require any hysteretic rule.
For inelastic spectra, an elasto-plastic with hardening model is employed.
Please do read the Help System and publications cited in the latter for further clarifications.
Seismosoft Support
Re: About hysteresis rule
As seismosignal help noted,"Overdamped inelastic spectra are commonly employed within a displacement-based design/assessment philosophy, and are based on the principle that a given structural system responding within its nonlinear post-yield range and dissipating energy through hysteresis, may be represented by means of an equivalent overdamped elastic system featuring (i) an effective period of vibration that corresponds to the secant stiffness at point of maximum displacement and (ii) a relatively high value of equivalent viscous damping to simulate the hysteretic damping developed by the actual nonlinear system. "
The different responses are expected for the structures with different hysteretic characteristics.In seismosignal,the computation of overdamped spectra does not require any hysteretic rule.why?
The different responses are expected for the structures with different hysteretic characteristics.In seismosignal,the computation of overdamped spectra does not require any hysteretic rule.why?
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seismosoft
- Posts: 1271
- Joined: 06 Jul 2007, 04:55
Re: About hysteresis rule
You may find a large number of publications with indications/suggestions on how to compute equivalent viscous damping for different hysteretic models. Below we list some of these:
- Gulkan P. and Sozen M. (1974). Inelastic response of reinforced concrete structures to earthquakes motions, ACI Journal 71, 604-610.
- Shibata A. and Sözen M. (1976). Substitute structure method for seismic design in reinforced concrete, ASCE Journal of Structural Engineering 102, 1-8.
- Kawashima K. and Aizawa K. (1986). Modification of earthquake response spectra with respect to damping ratio, Proceedings of the 3rd US National Conference on Earthquake Engineering, Charleston, South Caroline, vol. II, pp. 1107–1116.
- Freeman S.A. (1998). Development and use of capacity spectrum method, Proceedings of the 6th US National Conference on Earthquake Engineering, Seattle, CD-ROM, EERI, Oakland
- Lin Y.Y. and Chang K.C. (2003). Study on damping reduction factor for buildings under earthquake ground motions. Journal of Structural Engineering (ASCE) 129(2), 206 – 214.
- Blandon C.A. and Priestley M.J.N. (2005). Equivalent viscous damping equations for direct displacement based design, Journal of Earthquake Engineering 9(S2), 257-278.
- Priestley M.J.N. and Grant D.N. (2005). Viscous damping in seismic design and analysis, Journal of Earthquake Engineering 9 (S2), 229-255.
- Dwairi H.M., Kowalsky M.J.N. and Nau J.M. (2007). Equivalent damping in support of direct displacement-based design, Journal of Earthquake Engineering 11, 512–530.
- Priestley M.J.N., Calvi G.M. and Kowalsky M.J. (2007). Displacement-Based Seismic Design of Structures, IUSS Press, Pavia, Italy.
- Stafford P.J., Mendis R. and Bommer J.J. (2008). Dependence of damping correction Factors for response spectra on duration and numbers of cycles. Journal of Structural Engineering (ASCE) 134(8), 1364-1373.
Seismosoft Support
- Gulkan P. and Sozen M. (1974). Inelastic response of reinforced concrete structures to earthquakes motions, ACI Journal 71, 604-610.
- Shibata A. and Sözen M. (1976). Substitute structure method for seismic design in reinforced concrete, ASCE Journal of Structural Engineering 102, 1-8.
- Kawashima K. and Aizawa K. (1986). Modification of earthquake response spectra with respect to damping ratio, Proceedings of the 3rd US National Conference on Earthquake Engineering, Charleston, South Caroline, vol. II, pp. 1107–1116.
- Freeman S.A. (1998). Development and use of capacity spectrum method, Proceedings of the 6th US National Conference on Earthquake Engineering, Seattle, CD-ROM, EERI, Oakland
- Lin Y.Y. and Chang K.C. (2003). Study on damping reduction factor for buildings under earthquake ground motions. Journal of Structural Engineering (ASCE) 129(2), 206 – 214.
- Blandon C.A. and Priestley M.J.N. (2005). Equivalent viscous damping equations for direct displacement based design, Journal of Earthquake Engineering 9(S2), 257-278.
- Priestley M.J.N. and Grant D.N. (2005). Viscous damping in seismic design and analysis, Journal of Earthquake Engineering 9 (S2), 229-255.
- Dwairi H.M., Kowalsky M.J.N. and Nau J.M. (2007). Equivalent damping in support of direct displacement-based design, Journal of Earthquake Engineering 11, 512–530.
- Priestley M.J.N., Calvi G.M. and Kowalsky M.J. (2007). Displacement-Based Seismic Design of Structures, IUSS Press, Pavia, Italy.
- Stafford P.J., Mendis R. and Bommer J.J. (2008). Dependence of damping correction Factors for response spectra on duration and numbers of cycles. Journal of Structural Engineering (ASCE) 134(8), 1364-1373.
Seismosoft Support