損傷に寄与する地震入力エネルギーに関する考察

概要

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This paper is concerned with the definition and prediction of damage-causing earthquake input energy used in energy-based seismic design. It is necessary for the input energy to be closely related to structural damages such as maximum plastic deformation and cumulative plastic deformation. In this paper, input energy is defined as the maximum response of the sum of elastic strain energy and the energy dissipated by plastic deformation. Kinematic energy is not included in this definition. Both Housner and Akiyama predicted input energy by using a pseudo-velocity response spectrum corresponding to the initial natural period calculated from the elastic stiffness. The apparent natural period of frames (the time required for one cycle vibration) accompanied with plastic deformations under earthquakes is longer than the initial natural period, and the input energy depends primarily on the apparent natural period. In predicting the input energy, this paper proposes to use the apparent natural period calculated from the mean of the plastic deformation per half-cycle in the whole vibration.
2000-04-30