A Numerical Study of Effects of Valley-Weathering and Valley-Shape-Ratio on the Ground Motion Characteristics

• Autorzy: Narayan J. P. , Arafat M. Y. , Kamal

Identyfikatory

DOI

10.2478/s11600-014-0235-4

• Języki publikacji: EN

Abstrakty

EN

A study of combined effects of valley-weathering and valley-shaperatio on the ground motion characteristics and associated differential ground motion (DGM) is documented in this paper. In order to properly quantify the weathering effects, a forth-order-accurate staggered-grid viscoelastic time-domain finite-difference program has been used for the simulation of SH-wave responses. Simulated results revealed that the defocusing caused by valley is frequency-independent in contrast to the ridge-focusing. A decrease of average spectral amplification (ASA) with an increase of shape-ratio of the non-weathered triangular and elliptical valleys was obtained. Overall, the amplification and de-amplification pattern was larger in case of triangular valleys as compared to the elliptical valleys. It can be concluded that the dwelling within or near the topcorners of weathered valleys may suffer more damage as compared to their surroundings. A weathered triangular valley with large shape-ratio may cause unexpected damage very near its top-corners since both the ASA and DGM are largest.

Słowa kluczowe

EN

viscoelastic time-domain response of valleys; finite difference method; weathering and valley-shape-ratio effects; local site effect

PL

wietrzenie; kotliny; ruchy Ziemi; atmosfera; metoda różnic skończonych

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2015
• Tom: Vol. 63, no. 1
• Strony: 154--175
• Opis fizyczny: Bibliogr. 34 poz., rys., tab., wykr.

Twórcy

autor

Narayan J. P.

• Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India

autor

Arafat M. Y.

• Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India

autor

Kamal

• Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India

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