Dynamic analysis for soil-structure systems using dynamic stiffness

Abstract EN

This paper gives exact dynamic stiffness coefficient for beam element with axial force embedded in elastic medium having normal and tangential soil reactions.

These moduli of subgrade reactions are assumed to be constants along the length of the element The axial and flexural stiffness's are assumed to be uncoupled The paper concerns on finding the natural frequencies and corresponding modal shapes of plane frames partially embedded in the soil The variation of the eigenvalues and the eigenvectors by the soil modulus are studied These eigenvalues and eigenvectors are compared with those when static matrix method is used Finally, the dynamic response of a multi-story reinforced concrete building frame to blast loading are also considered.