�@ Œf�ÚŽGŽ��i˜a�j�F “ú–{’n�k�HŠwƒVƒ“ƒ|ƒWƒEƒ€�u‰‰�W Vol�F 5Šª ”N�F 1978”N •Å�F 1129-1136•Å ’˜ŽÒ�i˜a�j�F - ƒ^ƒCƒgƒ‹�i˜a�j�F - �´˜^�i˜a�j�F
- ƒL�[ƒ��[ƒh�i˜a�j�F - Œf�ÚŽGŽ��i‰p�j�F PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM ’˜ŽÒ�i‰p�j�F Koichiro ASANO, Sanshiro SUZUKI ƒ^ƒCƒgƒ‹�i‰p�j�F EFFECT OF TIME-DEPENDENT SPECTRA OF RANDOM EARTHQUAKE EXCITATIONS ON HYSTERETIC STRUCTURAL RESPONSE �´˜^�i‰p�j�F
A new analytical technique for the assessment of random response of the bi-linear hysteretic system with single-degree-of freedom is presented to investigate the effect of time-dependent spectra of earthquake excitation on nonlinear hysteretic response of the building structure. Earthquake excitations considered herein are random processes whose non-stationarity and nonwhite spectral characteristics are prescribed by an energy envelope function and time-dependent predominant angular frequency respectively. Numerical computations are carried out concerning to r.m.s. values of non-stationary relative displacement response of the structural system with bi-linear hysteretic characteristics by considering or neglecting time-dependence of power spectra of earthquake excitations. It is concluded, from the results, that time-dependence of power spectra of earthquake excitations can't be ingnored from the earthquake damages of the structural system point of view. ƒL�[ƒ��[ƒh�i‰p�j�F - ‹LŽ–‹æ•ª�F - ‹æ•ª �@�@�@ˆÏˆõ‰ï˜_•¶�W