水平な多層地盤での S 波の重複反射による増幅

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The earthquake motion on the ground surface relates with subsoil conditions. Authors propose a method of numerical response analisis in time domain of multi-layered ground due to an earthquake, on assumptions that ground responses only caused by a phenomena of shear wave multiple refrection in stratified layers (Eq. (7)). In this analisis the ground is idealized by multi-layered ground on a bedrock. Each layeris parallel and horizontal and has homoginious dynamic properties, and the bedrock is a layer having semi-infinit thickness and through which shear waves enter and disperse during the earthquake. For idarize the ground, it is necessary to decide the layer which can be regarded as the bedrock. K. Kani defines as below. The bedrock is the upper layer which has sufficient thickness and the travel time of shear wave in which is much longer than the time of duration of principal shock of an earthquake. From several analisis using above mentioned method, addition to Kanai's definition, it is concluded that bedrock should be taken for a layer, below which soil dynamic properties are cotiniouse and their difference for depth are little. It is indicated a method for inferential calculations of earthquake movements in layers and incident waves through the bedrock, from an earthquake motion accelerogram (Eq. (9)). Using this method, they calculate incident waves through the bedrock for several cases and show these response spectra in Fig.7〜Fig.14. From these, it is found that their response spectra show the nature of velocity constant compaired with the surface ground motion.
社団法人日本建築学会の論文
1970-07-30

水平な多層地盤での S 波の重複反射による増幅

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