الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
A theoretical study, of the dynamic behaviour of structures subjected to impact loads, such as blast Impact load and vehicle impact load is presented. Five, ten and fifteen story shear building resting on flexible foundations are investigated. The impedance functions of the foundations are derived from dynamic continuum theories. Using the substucture approach,
the equations of motion of the soll-structure Interaction system are determined. These equations are solved, both in the time domain and in the frequency domain using the non-classical modal analysis and the complex response analysis respectively. Both methods give almost the same results, but the complex response analysis (Fourier approach) tends to overestimate the response.
The analysis indicates that the frist mode of vibration controls the response for the case of blast load impacting the top floor of the structures, hence the maximum response was observed to occur always at