Seismic responses of an isolated long-span bridge using frequency domain and time dependent procedures
Yükleniyor...
Tarih
2023
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Seismic behavior of an isolated bridge is analyzed in the frequency domain under the effects
of non-stationary ground motions. For dynamic solutions, different ground environments are
considered by simulating non-stationary quakes that can be represented from bedrock to soft
ground level. In the simulations, power spectral functions and filtered white noise model are
adopted for spectral densities of the earthquake excitations. Various computer algorithms
have been developed for earthquake simulations, establishing the bridge finite element model
and stochastic solutions. Twenty simulated ground motions are used for each soil profile and
the parameters of Rayleigh dispersion are estimated by evaluating the system responses for
each ensemble. A number of peak response factors dependent on soil conditions are presented
for seismic responses. In addition, extreme value distributions of the responses are shown
with the probability of exceeding functions and tables. The responses are discussed for the
specific exceedance level of probabilities used in probabilistic design process. The stochastic
analyses generally yielded responses consistent with time domain solutions. Exceedance
probability functions of the peak responses were obtained in a close relationship. However,
the probability distributions of the responses decomposed for the soft soil case and they
displayed a wider dispersion even for low exceedance levels. The peak responses are
expressed with some exceedance probabilities. In the estimation of response variations, this
study showed the practicality of the frequency domain method and the results revealed higher
peak response factors and variances for softer soil conditions. Furthermore, this study
indicated that the frequency domain procedure is an effective tool in the obtaining of nonstationary seismic responses.
Açıklama
Anahtar Kelimeler
Non-Stationary, Simulated Earthquakes, Peak Responses, Power Spectrum, Isolator
Kaynak
Turkish Journal of Civil Engineering
WoS Q Değeri
N/A
Scopus Q Değeri
Q3
Cilt
34
Sayı
4
Künye
Sarıtaş, F., & Hasgür, Z. (2023). Seismic responses of an isolated long-span bridge using frequency domain and time dependent procedures. Turkish Journal of Civil Engineering, 34(4), 45-69.
