451 Study on Elastic-plastic Deformation of Thin Cylindrical Shell Subjected to Horizontal and Vertical Excitations Simultaneously

Abstract

This study treats the dynamic stability of echanical systems subjected to multi −directional excitations ， sudh as dynamic buckling behavior ， etc ．A steel Cylindrical pier is treated a皿 d modeled analytically as a thin cylindrical structure wi 七 h an attached mass on its t玉 p ． The analysis is carried out by numerical simulations ， where the horizontal and the vertical seismic Ioads are applied simultaneously ． The effects of the horizontal and vertical input frequencies on the dynarnic stability are studied ． It is known that the seismic responses of the thin cylindric 田 shell structure tend to increase due to the coupling effects between the hodzontal and vertical excitations ， and that 且attening phenomena make the cylindrical shell structures more unstable