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| 摘要: |
| 选取206根人工林杉木规格材,按照动态弹性模量配成3个测试组,研究了规格材测试跨度与其抗弯强度之间的依存性,并利用斜率法和形状参数法求得抗弯强度5%分位值和50%分位值的长度尺寸效应.结果表明,斜率法获得杉木规格材抗弯强度5%分位值和50%分位值的长度尺寸效应系数分别为0.43,0.33,均大于国外研究结果,特别是ASTM D1990的推荐值;当利用二参数威布尔分布函数拟合所测抗弯强度时,用形状参数法求得的参数k为4.41,4.40,大于用斜率法所获得的长度尺寸效应系数的倒数;试验获得的长度尺寸效应系数可在实际工程中应用. |
| 关键词: 木结构 规格材 抗弯强度 尺寸效应 |
| DOI： |
| 分类号:TU531.1 |
| 基金项目:国家林业局948竹、木基复合新材料技术引进创新与示范项目，国家林业局948木结构房屋耐久及舒适性能评价技术引进项目，中央级公益性科研院所基本科研业务费专项资金项目? |
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| Size Effect of Length on Flexural Strength of Chinese Fir Dimension Lumber Used in Wood Structure |
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| Abstract: |
| Size effect of length is one of important factors to adjust flexural strength of dimension lumber.The dependence between the flexural strength and the size of Chinese fir dimension lumber was investigated.206 dimension lumbers were sorted into three test groups in terms of dynamical modulus of elasticity.Three test spans(135,162 and 207 cm) were selected and flexural property was tested.The length size effects of 5~(th) and 50~(th) percentiles of flexural strength were estimated by the slope method and the ... |
| Key words: wood structure dimension lumber flexural strength size effect |
