�@ Œf�ÚŽGŽ��i˜a�j�F “ú–{’n�k�HŠwƒVƒ“ƒ|ƒWƒEƒ€�u‰‰�W Vol�F 6Šª ”N�F 1982”N •Å�F 1593-1600•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 Hitoshi SEYA, Gengo MATSUI ƒ^ƒCƒgƒ‹�i‰p�j�F CIRCUMEFRENTIAL HIGHER MODE RESPONSE OF SHELL TO SEISMIC WAVES �´˜^�i‰p�j�F
Circumferential higher modes are excited when a large shell structure with a ring foundation is subjected to spatially variant seismic waves. First, we ascertain the response of a ring foundation which rests directly on a semi-infinite elastic medium. The displacement function of the soil is evaluated by the analytical solution of a 3-D wave equation. And on the assumption obtained from the ring analysis, the response of shell is evaluated by the modal method. To analyse the higher modes response, the method, using a pseudostatic displacement which should be calculated from the bottom boundary, is presented. As an example, the response of a cooling tower subjected to an incident seismic wave with a constant velocity is discussed. ƒL�[ƒ��[ƒh�i‰p�j�F - ‹LŽ–‹æ•ª�F - ‹æ•ª �@�@�@ˆÏˆõ‰ï˜_•¶�W