Energy Absorption of Structures Under Cyclic Loading

by Kenneth Medearis,
D. H. Young,

Serial Information: Journal of the Structural Division, 1964, Vol. 90, Issue 1, Pg. 61-92

Document Type: Journal Paper


The results of an experimental and theoretical investigation of the energy absorption, or structural damping, characteristics of conventional plywood shear walls are described. The cyclic-loading test procedure, wherein the test specimen is subjected to a succession of reversed loading cycles of progressively increasing magnitude, was used for each test. Eight different tests were made, and the cyclic load-deflection curves were then constructed using the experimental data. From these curves, it was possible to derive back-bone curves, relating the maximum load per cycle to the average absolute value of the maximum deflections per cycle, and curves relating energy capacity to maximum deflection, energy absorption to maximum deflection, and residual deflection to maximum deflection. Values of an equivalent viscous damping ratio, νeq, were found to average 0.10 for shear walls with plywood on both sides. Having νeq, it is then possible to use the velocity response spectrum to determine the maximum relative velocity, and subsequently the earthquake energy output, for a particular plywood shear wall. The derived curves previously mentioned are used in conjunction with the energy method to obtain the maximum panel response.

Subject Headings: Shear walls | Displacement (mechanics) | Load tests | Curvature | Cyclic tests | Cyclic loads | Absorption | Damping

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