Creep and Creep-Recovery Models for Wood Under High Stress Levels
Creep and Creep-Recovery Models for Wood Under High Stress Levels
复制标题
高应力水平下木材的蠕变和蠕变恢复模型
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
D. Rosowsky
中科院分区：
文献类型：
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作者：
Z. Cai;K. Fridley;M. O. Hunt;D. Rosowsky
对40个南方松木材试件进行了三点弯曲试验，研究了木材在高应力水平下的蠕变和蠕变恢复行为。施加69%至91%预测静强度的应力水平23 h，允许恢复1 h，并研究了所得挠度与时间的关系。实验蠕变和蠕变恢复行为建模使用修改的幂律函数。结果表明，这些函数提供了最好的拟合小学和中学的实验数据。该经验模型可用于模拟高应力水平下木材的粘弹行为。模拟将提供一个有用的工具，在未来的研究，以检查持续时间（DOL）的影响，这是一个更重要的因素，在木结构设计。
Forty small clear southern pine specimens were loaded under third-point bending to examine creep and creep-recovery behavior for wood under high stress levels. Stress levels of between 69% and 91% of the predicted static strength were applied for 23 h with 1 h allowed for recovery, and the resulting deflection vs. time behavior was studied. The experimental creep and creep-recovery behavior was modeled using modified power law functions. The results indicate that these functions provide the best fit to both primary and secondary experimental data. The empirical models can be used to simulate the viscoelastic behavior of wood under high stress levels. The simulation will provide a useful tool in future studies to examine duration-of-load (DOL) effect, which is one of the more important factors in wood structural design.