Accession Number : ADB020287


Title :   Posttest, Two-Dimensional, Free-Field Calculation of HARD PAN I, Event 3: Calculation HPI-3.4


Descriptive Note : Final rept.


Corporate Author : NEW MEXICO UNIV ALBUQUERQUE ERIC H WANG CIVIL ENGINEERING RESEARCH FACILITY


Personal Author(s) : Baird, Glenn T ; Rudeen, David K ; Higgins, Cornelius J


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADB020287


Report Date : Jun 1977


Pagination or Media Count : 81


Abstract : The results of the pretest calculations of HARD PAN I Event 3 were analyzed and compared with experimental data to evaluate the accuracy of the input (pressure functions, geology, material properties) and output (computed velocity waveforms). Seismic velocities for a recommended geology were developed from contours of experimental times-of-arrival of first motion and incorporated into new material properties as the initial loading and unloading slope of the hydrostat. Lock-up strain values and shear failure envelopes were consistent with previous material properties and laboratory test results. The analysis indicated that the BLEST pressure function was satisfactorily modeled based on the impulse delivered to the soil. However, a new HEST pressure function which would accurately reflect the experimental pressure/time history was developed for the posttest calculations. Posttest calculation HPI-3.4 was performed with the new input and compared with experimental data. This comparison indicated fairly good agreement. Adjustment factors to modify the data for input to the Three-Dimensional, Structure/Media Interaction (SMI3D) Code were then recommended.


Descriptors :   *NUCLEAR EXPLOSION SIMULATION , CURVE FITTING , EQUATIONS OF MOTION , EXPERIMENTAL DATA , FINITE DIFFERENCE THEORY , GEOLOGY , GROUND MOTION , HYDRODYNAMIC CODES , VELOCITY , WAVE PROPAGATION


Subject Categories : Seismic Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE