ねじれ振動を伴う建物の弾塑性応答解析 : 復元力特性の第2勾配が応答に及ぼす影響

Abstract

In this paper, the dynamic effects that second modulus of the hysteresis characteristic affects the response, are investigated. Hysteresis characteristic is bi-linear type. Dimensionless Quantity which is the amount of second modulus divided by first modulus, is introduced and the elastoplastic response analysis is done for dimensionless quantity γ from 0.0 to 1.0 (γ=0.0 for perfect elasto-plastic, γ=1.0 for elastic). The used ground motion is El-Centro 1940.5.12 NS component and maximum acceleration is 100 gal. The resultants which have the frequency ratio (ω_θ/ω_x) and eccentric distanse (e/ρ) as the parameter, are investigated by the form of the response spectrum. In the result, when frequency ratio is small and uncoupled natural period Tx is long, it becomes clear that second modulus strongly affects the response spectrum.