Abstract
The constant-strength ductility spectrum is a nonlinear response spectrum that is commonly used to establish the demand curve of the seismic response during performance-based seismic design. It is affected by many factors. In this paper, to evaluate the effect of the major influencing factors, including the structural parameters and seismic factors, the constant-strength ductility spectrum is calculated under different conditions based on 5535 ground motion records. Conclusions are drawn based on the mean constant-strength ductility spectra. (1) With respect to the effects of structural factors, the variation trend of the ductility spectra is highly consistent with increasing T, and the ductility spectra are usually larger for larger ζ and smaller Cy and k2. (2) With respect to the seismic factors, the ductility spectra show obvious differences in different periods; however, some parameters, such as PGA, have no influence on the ductility spectra. The results of this study can provide a theoretical basis for the calculation of ductility demand in the seismic design of structures.
Highlights
Nonlinear response spectra are used to establish the demand curves of seismic responses
(2) With respect to the seismic factors, the ductility spectra show obvious differences in different periods; some parameters, such as peak ground accelerations (PGAs), have no influence on the ductility spectra. e results of this study can provide a theoretical basis for the calculation of ductility demand in the seismic design of structures
Conclusion and Discussion is study compares the influences of different factors on the constant-strength ductility spectra based on the 5535 ground motion records in NGA-West2 database, and the effects of structural parameters and seismic factors on the spectra are analyzed. e following conclusions are inferred from the results of this study: (1) With respect to the effects of structural parameters, except for ζ at short-period ranges, the variation of the ductility spectra value is highly consistent with the increasing T
Summary
Nonlinear response spectra are used to establish the demand curves of seismic responses. Many studies have focused on the effects of structural parameters on constant-ductility seismic resistance spectra by a large number of ground motion records [5,6,7,8,9]. Some researchers have studied the effects of structural parameters and seismic factors on the constant-strength response spectra and constant-ductility response spectra [10, 11]. Castaldo et al [16, 17] aimed to propose seismic reliability-based relationships between the behavior factors and the displacement demand for nonlinear hardening and softening structures isolated by friction pendulum system devices and double concave sliding bearings. E variation rule of constant-strength ductility spectra can be obtained under different structural parameters and seismic factors. The constant-strength ductility spectra will change, and the variation rule can be analyzed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
