応答スペクトル法による表層地盤の非線形増幅特性の解析法

概要

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This paper proposes a response spectrum method (RSM) for evaluating nonlinear amplification of surface strata (SS) overlying an engineering bedrock (EBR). The proposed RSM follows the procedures below. (1) Represent the response characteristics of SS on EBR by a multi-lumped mass model with shear springs and damping coefficients. (2) Calculate a period T_1, a mode shape U and a modal damping factor ζ_1 for the first vibration mode. (3) Evaluate the equivalent shear wave velocity Vs_e of SS. (4) Evaluate the amplification factor G_5 of the surface to EBR at T_1 using the Haskell matrix of two strata consisting of an equivalent SS with Vs_e and ζ_1 on EBR. (5) Evaluate the displacements and shear strains in SS. (6) In accordance with nonlinear relations between shear modulus (G), damping factors (h) and shear strains, replace soil constants G and h by those corresponding to strains. (7) Return to step (1) with revised G and h. Iterate these procedures until T_1 becomes stable. (8) After T_1 is converged, calculate the response distributions in SS. The applicability of the proposed RSM is confirmed through the comparative studies.
社団法人日本建築学会の論文
2001-01-30