این سایت در حال حاضر پشتیبانی نمی شود و امکان دارد داده های نشریات بروز نباشند
ژئوفیزیک ایران، جلد ۱۷، شماره ۳، صفحات ۱-۱۲
عنوان فارسی Three-dimensional seismic response of earth dams subjected to spatially varying earthquake ground motion
چکیده فارسی مقاله For extended structure, the seismic load has a spatiotemporal variation that simultaneously changes with time and space. The incorporation of the seismic wave spatial random variability effect is
especially important when large structures such as long bridges, dams, and large buildings are
analyzed. The effect of spatially varying earthquake ground motion (SVEGM) on the seismic
response of earth dams is analyzed in this paper. To this end, a parametric study is conducted to investigate the effects of length to height ratio ( ) on the 3D seismic response of the studied dams. Ground motions, consistent with the three-directional lagged coherency model, are generated at
different discretized cells at the base of the dam. The dams are assumed to sit on trapezoidal and
V-shaped canyons and vibrate in all three directions, upstream-downstream, vertical, and
longitudinal. The average coherency of different frequencies is calculated and used for the generation of SVEGM. The time histories are simulated using a spectral representation-based method. The
separation distance between the cells is determined in such a way that 90% of correlation between seismic input motions can be captured. For each case of  ratio, a numerical model of the dam and its foundation is constructed using the finite difference numerical method. The 3D seismic
behavior of the earth dams is evaluated under the artificially generated three-directional components of SVEGM. Generally, it is concluded that with increasing  ratio, at the midpoint of the dam crest, the difference between maximum of acceleration values obtained by applying uniform and SVEGM excitations decreases. In all cases of analyses, SVEGM has decreasing effect on the vertical displacement of dam crest.
کلیدواژه‌های فارسی مقاله
عنوان انگلیسی Three-dimensional seismic response of earth dams subjected to spatially varying earthquake ground motion
چکیده انگلیسی مقاله For extended structure, the seismic load has a spatiotemporal variation that simultaneously changes with time and space. The incorporation of the seismic wave spatial random variability effect is
especially important when large structures such as long bridges, dams, and large buildings are
analyzed. The effect of spatially varying earthquake ground motion (SVEGM) on the seismic
response of earth dams is analyzed in this paper. To this end, a parametric study is conducted to investigate the effects of length to height ratio ( ) on the 3D seismic response of the studied dams. Ground motions, consistent with the three-directional lagged coherency model, are generated at
different discretized cells at the base of the dam. The dams are assumed to sit on trapezoidal and
V-shaped canyons and vibrate in all three directions, upstream-downstream, vertical, and
longitudinal. The average coherency of different frequencies is calculated and used for the generation of SVEGM. The time histories are simulated using a spectral representation-based method. The
separation distance between the cells is determined in such a way that 90% of correlation between seismic input motions can be captured. For each case of  ratio, a numerical model of the dam and its foundation is constructed using the finite difference numerical method. The 3D seismic
behavior of the earth dams is evaluated under the artificially generated three-directional components of SVEGM. Generally, it is concluded that with increasing  ratio, at the midpoint of the dam crest, the difference between maximum of acceleration values obtained by applying uniform and SVEGM excitations decreases. In all cases of analyses, SVEGM has decreasing effect on the vertical displacement of dam crest.
کلیدواژه‌های انگلیسی مقاله SVEGM, Earth Dam, Coherency model, Finite-difference numerical method, Dynamic analysis
نویسندگان مقاله Amir Ghalyanchi Langroudi |
Ph.D. Candidate, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

Mohammad Davoodi |
Associate Professor, Geotechnical Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran

Mohammad Kazem Jafari |
Professor, International Institute of Earthquake Engineering and Seismology, Tehran, Iran

Masoud Nekooei |
Assistant Professor, Department of Structural Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

نشانی اینترنتی https://www.ijgeophysics.ir/article_165923_c221cb5797b1992a9bd057068e7a2e67.pdf
فایل مقاله فایلی برای مقاله ذخیره نشده است
کد مقاله (doi)
زبان مقاله منتشر شده fa
موضوعات مقاله منتشر شده
نوع مقاله منتشر شده
برگشت به: صفحه اول پایگاه   |   نسخه مرتبط   |   نشریه مرتبط   |   فهرست نشریات