応答変位法を用いた分割立坑の耐震設計法

概要

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Shaft is often used as a vertical approach to sewerage mains and ventilationinstallation of railroad and road tunnels. Because of diverse construction demands itsdimension becomes deeper and larger and its thickness and volume of thereinforcement increases. To design a shaft with less cost for construction a new designmethod should be developed to reduce stresses induced in the structural elements byincreasing its flexibility especially for constructing a reinforced concrete shaft. In thispaper we analyze deformation characteristics, bending moment and shear stressdeveloped in circular RC shafts for an applied horizontal seismic force. To make clearthe effect of shaft flexibility to the shaft response, we evaluate the response of shaft andsoil interaction by response displacement method, and analyze segmented shafts, whichare composed of circular lings with blotted joints between them. As the results a properselection of the rigidity of ring joints enables the reduction of induced stresses in thesegments caused by earthquake force.
日本自然災害学会の論文
2004-11-30