RC造骨組の地震時変形の漸増載荷解析による評価方法

概要

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A method to estimate maximum deformation of a R/C frame structure under a given earthquake response spectrum is studied. The method magnifies the deformation calculated by a push-over analysis under lateral force distribution taking into consideration the effect of higher modes. The nonlinear response analysis of five 12-story weak-beam strong-column frame structures with different elastic periods were carried out under twelve artificial earthquake motions. Maximum member response from all earthquake motions was studied. Optimum lateral force distribution is obtained by combining the force distributions of lowest three modes in relation to the ratio of spectral accelerations to represent the distribution pattern of the maximum member deformations. The calculated member deformations must be magnified by a uniform factor to obtain the absolute amplitudes of maximum member deformations. This factor, generally less than 2.0, varies with the amount of inelastic deformation developed in the structure. A larger magnification factor is needed for ductility factors between 1.0 and 2.0. The estimation errors was reduced remarkably compared with the estimate using lateral force distributions in defined by design story shear coefficients A, or by the first mode shape.
一般社団法人日本建築学会の論文
2002-03-20