Seismic Response of ۲D Triangular-Shaped Alluvial Valleys to Vertically Propagating Incident SV Waves
- سال انتشار: 1394
- محل انتشار: فصلنامه زلزله شناسی و مهندسی زلزله، دوره: 17، شماره: 2
- کد COI اختصاصی: JR_JSEE-17-2_002
- زبان مقاله: انگلیسی
- تعداد مشاهده: 263
نویسندگان
International Institute of Earthquake Engineering and Seismology (IIEES)
International Institute of Earthquake Engineering and Seismology (IIEES)
International Institute of Earthquake Engineering and Seismology (IIEES)
International Institute of Earthquake Engineering and Seismology (IIEES)
چکیده
This paper presents the results of a numerical parametric study on the seismic behavior of ۲D triangular-shaped valleys subjected to vertically propagating incident SV waves. The medium is assumed to have a linear elastic constitutive behavior. All calculations are executed in time-domain utilizing the spectral finite element method. Clear perspectives of the amplification patterns of the valley are presented by investigation of the frequency-domain responses. It is shown that the amplification pattern of the valley and its frequency characteristics depend strongly on its shape ratio. The maximum amplification ratio along the ground surface occurs at the centre of the valley. A simple formula has been proposed for making initial estimation of the natural period of the valley in site effect microzonation studies. The natural frequency of the alluvial valley decreases as the shape ratio of the valley decreases; moreover, the value of the natural frequency of the triangular alluvial valley is bigger than the natural frequency of the corresponding rectangular alluvial valley.کلیدواژه ها
Triangular alluvial valleys, Amplification, Site Effects, Topography effect, Spectral finite element, wave propagationاطلاعات بیشتر در مورد COI
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