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Author(s):	Floroiu, Laurentiu; Schweiger, Helmut F.
Title:	Parametric study of the seismic ground response of a linear visco-elastic soil layer improved by stone columns or pile-like elements
Abstract:	This paper presents a qualitative investigation on how soil improvement influences ground response during earthquake events. The paper focuses on how modifications to stiffness, damping ratio and unit weight of soil reflect on the amplification functions. The study is carried out by means of finite element analyses using a linear visco-elastic material model and rigid bedrock conditions. The accelerogram recorded during the 1989 Loma Prieta (USA) earthquake is used as bedrock input motion. The results of this study suggest that under certain conditions the seismic load on the structures could be increased or decreased by changes of the eigenfrequencies and amplification functions of the natural ground conditions due to soil improvement. Parameterstudie zur seismischen Antwort einer linear visko-elastischen Bodenschicht mit säulenartiger Bodenverbesserung. Der Beitrag beschreibt erste Ergebnisse einer qualitativen numerischen Untersuchung zum Einfluss von Bodenverbesserung auf die seismische Antwort einer Bodenschicht infolge Erdbebenbeanspruchung. Das Hauptaugenmerk liegt auf der Beurteilung des Einflusses von Steifigkeit, Dämpfung und Wichte der Bodenschicht auf die Verstärkung der seismischen Anregung. Die Analysen werden mit der Finite-Elemente-Methode unter Annahme linear visko-elastischen Materialverhaltens und einer Anregung am unteren Modellrand durchgeführt, wobei als Eingangsbeschleunigung das Erdbeben von Loma Prieta (1989) verwendet wird. Die Ergebnisse zeigen, dass sich unter gewissen Bedingungen die seismische Beanspruchung von auf verbessertem Baugrund errichteten Gebäuden durch die Änderung der Eigenfrequenzen und der Bodenantwort des verbesserten Baugrundes verringern oder erhöhen kann.
Source:	geotechnik 38 (2015), No. 4
Page/s:	304-315
Language of Publication:	German

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