Dynamic Response of Embedded Structures
Abstract
A shock impulse environment simulated by low velocity impact (free- drop impact system) was developed to generate a well characterized dynamic loading on the free surface. Low velocity impact of a circular plate resting on sand provided the vehicle by which the dynamic loading on the free surface was characterized. An analysis based on linear elastodynamics was derived for transient waves on a thin plate resting on an elastic half-space (sand). The results provide an understanding of plate vibration (foundation vibration), of the interaction between the plate and the sand, and of the propagation of the load into the sand. The dynamic behavior of a typical elastic buried structure was studied by using plexiglass; where as micro reinforced-concrete was used to study the behavior of a buried reinforced concrete structure. Loading relief at the center of the roof of the buried structures was observed. Furthermore, the Stiffer structure was observed to the experience loss soil arching. When a linear-elastic dynamic analysis by the finite element method was conducted, the numerical results were found to have good correlation with the experimental observation of the peak displacement on the buried roof. However, the behavior after the peak response can not be simulated using the current linear elastic formulation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 14, 1989
- Accession Number
- ADA206682
Entities
People
- Leon M. Keer
- Surendra P. Shah
Organizations
- Northwestern University