地震动频谱非平稳性对结构非线性反应的影响

应用均匀调制随机过程模型和演变的随机过程模型合成了人工地震加速度过程。以此为输入，计算了一个三跨十层呆结构的地震反应，比较结果表明，考虑地震动的频谱非平稳稳征后，所计算结构的层位移，梁端塑性转角，柱的弯矩和剪力显著增大，结构在相对较小的地震动峰值下发生倒塌。

EFFECTS OF FREQUENCY NONSTATIONARITY OF SEISMIC GROUNDMOTION ON INELASTIC RESPONSE OF STRUCTURES

Both mathematical models nf uniform modulatinn random process and evnlutionary ran- dom process are used to generate artificial accelerograms which are used as the seismic inputs to clarify the effects of frequency nonstationarity of seismic ground motion on inelastic response of structure. Inelastic responses of a frazne structure with three bays and ten floon are evaluated. The results reveal the evidenoe that nonstationary contents included in earthquake ground motion enlarge greatly the responses of floor displaceznents, plastic rotations, bending moment and shears of columns, and the frame structure colla pses under seismic motion with a relatively small peak value.