RESEARCH ON ENERGY ABSORBING STRUCTURES, PART IV.
Summary scientific rept., Feb 65-Feb 66.
ARA INC WEST COVINA CALIF
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The present program is concerned with developing the appropriate analytical techniques utilizing selected metallic model structures for the very-large-deflection behavior of plate and shell structure. Deflection measurements were made using both flat plate and curved shell specimens, supported at one edge and loaded at the opposite end. Both uniform and corner loadings were employed. The experimental data was then correlated with the analytical results. For this purpose, a previous solution was used for the case of large deflections of cantilever beams subjected to uniform edge loading. For the non-uniform loading and curved shell case, an IBM computer program was developed in order to correlate the analysis with the experimental results. The IBM program did not lead to practical results for the general plate-like or curved shell problem unless an impractical grid or large number of node points were used. An alternate analytical approach was then taken wherein the numerical procedure was simplified considerably. Unfortunately, sufficient time was not available to obtain the numerical results at the time of the preparation of this report. During this years program, a limited investigation was made of the characteristics of the displacement type damper. It was shown that if this damper is used in a spring-mass-system, the maximum percent critical damping possible is 30 before the damper prevents the restoration of the mass to its initial zero displacement. Author
- Structural Engineering and Building Technology