Effect of Waveform and Loading Sequence on Low-Cycle Compressive Fatigue Life of Spruce
Publication: Journal of Materials in Civil Engineering
Volume 15, Issue 1
Abstract
The effect of waveform and loading sequence on the low-cycle fatigue life of spruce was investigated using parallel-to-grain compressive tests. Triangular, sinusoidal, and square waveforms were used, with a peak stress level of 90% of static compressive strength and a load frequency of 0.5 Hz. Duty ratios ranging from 0.10 to 0.90 were adopted for square waveforms. Two types of stepped-cyclic-loading sequences with a duty ratio of 0.50 were also used. It was found that fatigue life is a function of the work done by the load and the shape of the waveform over a cycle. Damage accumulated most rapidly under square waveforms with a high duty ratio. A triangular waveform is the least damaging of those considered. For waveforms having the same work, the maximum loading rate is the strongest influence on the damage accumulation in wood. High-to-low stepped-cyclic-loading sequences are more damaging than low-to-high sequences, suggesting that wood has “memory.” This study has practical significance to the behavior of compression members and connections within structural systems subjected to cyclic loads.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 15 • Issue 1 • February 2003
Pages: 93 - 99
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Feb 26, 2001
Accepted: Jan 23, 2002
Published online: Jan 15, 2003
Published in print: Feb 2003
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