17103

بررسي اثر شكل بر پتانسيل بزرگنمايي لرزه اي تپه هاي دو بعدي

59

70

12

Although the seismic behavior of a hill could be considerably affected by its geometrical shape, no comprehensive research has been reported in the literature, clarifying the weight of this parameter. This paper compares numerically the seismic behavior of two-dimensional semi-sinusoidal, semi-elliptical and trapezoidal shaped hills subjected to vertically propagating incident P- and SV- waves, using the well known 2D transient boundary element method. It is shown that although altering the shape would not change some general observations common to all hills, but could affect the amplification patterns along the hill significantly, depending on its shape ratio as well as the length of the incident wave. Some approximate formula and tables are proposed for estimating the characteristic site period and the average amplification potential of an arbitrary shaped homogeneous single hill, which could be applied in site effect microzonation studies of topographic areas

1201023