RESTORING FORCE CHARACTERISTICS OF H-SHAPED STEEL BEAMS UNDER CYCLIC AND REVERSED LOADINGS : Part II : Strength Deterioration of Beams under Random Deflections
Open Access
- 1 January 1978
- journal article
- Published by Architectural Institute of Japan in Transactions of the Architectural Institute of Japan
- Vol. 265, 45-52
- https://doi.org/10.3130/aijsaxx.265.0_45
Abstract
In the preceding report, Part I, the following discussion was stated : When H-shaped steel beams are subjected to cyclic and reversed loadings with constant deflection amplitudes, load deflection hysteresis loops are stable within a certain critical deflection amplidute, while they become unstable beyond that deflection. However, the stationary hysteresis loops are again obtained, if the deflection amplitudes are reduced to within the critical one, even after the beams are damaged to deteriorate the strength. If the strength deterioration of the beams subjected to random deflections can be predicted from the results of the constant deflection amplitude tests, it is thought to be one of clues to prediction for failure of beams during an earthquake. Accordingly, in this paper how the strength of beams deteriorates due to various ratios of deflection amplitudes in the unstable deflection amplitude region is examined, and, based on those data, how to evaluate the strength deterioration of the beams subjected to random deflections is shown.Keywords
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