دانلود ترجمه مقاله اثرات متقابل خاک سازه و انزوا بر اساس عملکرد لرزه بنیاد خاک – نشریه اسپرینگر

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This study primarily focuses on structural induced liquefaction potential. Moreover, the effect of base isolation systems on both structural performance and liquefaction potential was studied including the soil-structure interaction effects. Four different types of structures and three different types of local sites were analyzed under two different input ground motions. It was mainly found that, depending on the structural type and for a certain depth, the liquefaction potential could be higher under the structure than the one in the free field. Besides decreasing the story drifts and shear forces in the structure, base isolation systems were very effective for decreasing liquefaction potential in the soil. It was also observed that soil-structure interaction leads to very significant changes in the response spectra. Keywords: Structure Induced Liquefaction, Cyclic Stress Ratio, Soil-Structure Interaction, Base Isolation Systems.

INTRODUCTION

The current state of the practice in assessing the potential for liquefaction beneath a structure is to treat the soil as if it were in the free-field and ignore any effects of the building. This practice has developed since it is believed to be a conservative approach and easy to perform. However it was observed, after recent earthquakes (e.g. Kobe, 1995 and Kocaeli, 1999), that there could be no signs of liquefaction in the free-field but once one gets closer to foundation, structure-induced liquefaction could be observed.According to Rollins and Seed, 1990, liquefaction occurs below the building before it occurs in the free field for (Sa/amax) ratios greater than about 2.4 which basically means the buildings with a period between 0.1 and 0.5 sec.

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