�@ Œf�ÚŽGŽ��i˜a�j�F “ú–{’n�k�HŠwƒVƒ“ƒ|ƒWƒEƒ€˜_•¶�W Vol�F 9-3Šª ”N�F 1994”N •Å�F E.145-E.150•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 THE JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM ’˜ŽÒ�i‰p�j�F Rafael RIDDELL ƒ^ƒCƒgƒ‹�i‰p�j�F EFFECT OF SOIL CONDITIONS ON INELASTIC RESPONSE SPECTRA �´˜^�i‰p�j�F
This paper presents some of the results of a recent study of the influence of soil conditions on the response of single-degree-of-freedom inelastic systems subjected to earthquake motions. The study considered 72 horizontal components of motion, most of them recorded during the March 3 , 1985 Chile earthquake (M�¡=7.8) and two main aftershocks; among these records are some of the stronger and longer duration earthquake motions ever recorded. The recording station sites were classified in one of three soil types, which can be generically referred to as rock, firm ground, and medium stiffness soil. The results are presented in terms of average normalized response spectra and smooth spectral shapes for each soil group and for several values of the response ductility factor. ƒL�[ƒ��[ƒh�i‰p�j�F - ‹LŽ–‹æ•ª�F - ‹æ•ª �@�@�@ˆÏˆõ‰ï˜_•¶�W