下水道カルバートの動的挙動（断面方向）に関する遠心実験と解析手法

摘要

近年，下水道大口径幹線カルバートの老朽化が進み，rn地震時の断面方向の安全性が問題になっている。ところrnが，下水道カルバートに作用する地震時の力学挙動（土rn圧と変形）の実態は，正確な測定例がなく不明である。rnまた，応答変位法に基づく下水道カルバートの現行耐震rn設計法は，ばねモデルを採用しているため，土と構rn造物の相互作用をうまく説明できない。%Dynamic response (earth pressure and deformation) of the sewer trunk culverts (Arch, Box, and Circular-types) was precisely measured by dynamic centrifuge model tests under various conditions. The test results were compared with predicted results according to the current seismic design specification based on seismic deformation method, revealing that the current specification does not conform to the test results. On the other hand, FE elastic analysis with slippage interface condition between the culverts and soils generated results that conformed well to the test results, yielding the conclusion that this analysis can be used as a proper seismic resistant design, instead of the current specification.