西安建筑科技大学学报(自然科学版)

为了获得圆竹的主要力学性能及其影响因素,完成了6组共计51个试件的试验研究,获得了圆竹的抗压强度、环刚度以及抗弯强度等力学性能,研究了含水率、竹节和取材单元对上述力学性能的影响.结果表明:竹材顺纹抗压强度分别为弦向横纹和径向横纹抗压强度的2.7倍和4.0倍; 竹节的紧箍作用有效提高了圆竹的环刚度,节部材较节间材提高90%; 竹节对竹材的抗压强度具有一定的提高作用,节部材较节间材提高6.3%; 含水率对圆竹抗压强度和抗弯强度有较大影响,但其影响趋势不同.圆竹的抗压强度随竹材含水率降低而增加,含水率降低40%时抗压强度提高约20%,而其抗弯强度随竹材含水率的降低而降低,在挠度相同的前提下,抗弯强度下降约20%.

In order to obtain the main mechanical properties and influencing factors of the bamboo culms, this paper complete tests of 6 groups a total of 51 specimens, which result in the longitudinal compressive strength, radial compressive strength and chord compressive strength of bamboo sheets, radial compressive strength and bending moment of bamboo culms. And carry out the influencing research of moisture content and bamboo nodes. The results show that the longitudinal compressive strength of bamboo sheets is almost the 2.7 times of radial compressive strength of bamboo sheets, and almost the 4.0 times of chord compressive strength of bamboo sheets. The radial compressive strength of bamboo culms with nodes increases 90% than the without nodes. The longitudinal compressive strength of bamboo culms with nodes increases 6.3% than the without nodes. The longitudinal compressive strength of bamboo culms increases with the decrease of moisture content, which shows that moisture content decreases by 40% while the compressive strength increased by about 20%. The bending moment of bamboo culms decreases with the decrease of moisture content, which shows that moisture content decreases by 40% while the compressive strength decreased by about 20%.

引言
1 试验材料
2 圆竹抗压性能研究
3 圆竹的径向环刚度
4 圆竹抗弯性能强度
5 结论

图1 圆竹受压破坏形态<br/>Fig.1 The compressive failure of bamboo culms

图1 圆竹受压破坏形态
Fig.1 The compressive failure of bamboo culms

表1 圆竹有竹节顺纹抗压强度试验结果<br/>Tab.1 Test result of compressive strength of bamboo culms with node

表1 圆竹有竹节顺纹抗压强度试验结果
Tab.1 Test result of compressive strength of bamboo culms with node

表2 圆竹无竹节顺纹抗压强度试验结果<br/>Tab.2 Test result of compressive strength of bamboo culms without node

表2 圆竹无竹节顺纹抗压强度试验结果
Tab.2 Test result of compressive strength of bamboo culms without node

表3 圆竹无竹节低含水率抗压强度试验结果<br/>Tab.3 Test result of compressive strength of bamboo culms without node and low moisture content

表3 圆竹无竹节低含水率抗压强度试验结果
Tab.3 Test result of compressive strength of bamboo culms without node and low moisture content

图2 竹片抗压单元试件尺寸<br/>Fig.2 The sample size of compressive Strength of bamboo sheets

图2 竹片抗压单元试件尺寸
Fig.2 The sample size of compressive Strength of bamboo sheets

图3 竹片顺纹抗压强度试验装置<br/>Fig.3 Test equipment for determination of the compressive strength of bamboo sheets

图3 竹片顺纹抗压强度试验装置
Fig.3 Test equipment for determination of the compressive strength of bamboo sheets

表4 竹片抗压强度<br/>Tab.4 Compressive strength of bamboo sheets

表4 竹片抗压强度
Tab.4 Compressive strength of bamboo sheets

图4 竹片受压破坏形态<br/>Fig.4 The compressive failure of bamboo sheets

图4 竹片受压破坏形态
Fig.4 The compressive failure of bamboo sheets

表5 竹片与圆竹试样抗压强度结果比较<br/>Tab.5 The compressive strength between bamboo culms and bamboo sheets

表5 竹片与圆竹试样抗压强度结果比较
Tab.5 The compressive strength between bamboo culms and bamboo sheets

图5 环刚度试验现象<br/>Fig.5 The radical compressive failure of bamboo culms

图5 环刚度试验现象
Fig.5 The radical compressive failure of bamboo culms

表6 圆竹无竹节环刚度试验结果<br/>Tab.6 The radial compression of bamboo-culm without node

表6 圆竹无竹节环刚度试验结果
Tab.6 The radial compression of bamboo-culm without node

表7 圆竹有竹节环刚度试验结果<br/>Tab.7 The radial compression of bamboo-culm with node

表7 圆竹有竹节环刚度试验结果
Tab.7 The radial compression of bamboo-culm with node

表8 圆竹试样环刚度结果比较<br/>Tab.8 The radial compression of bamboo-culm with node or without node

表8 圆竹试样环刚度结果比较
Tab.8 The radial compression of bamboo-culm with node or without node

图6 圆竹抗弯加载装置及试件<br/>Fig.6 Test equipment for determination of the bending strength of bamboo culms

图6 圆竹抗弯加载装置及试件
Fig.6 Test equipment for determination of the bending strength of bamboo culms

图7 圆竹抗弯强度变形<br/>Fig.7 The bending failure of bamboo culms

图7 圆竹抗弯强度变形
Fig.7 The bending failure of bamboo culms

图8 竹片抗弯强度试验现象<br/>Fig.8 The bending failure of bamboo sheets

图8 竹片抗弯强度试验现象
Fig.8 The bending failure of bamboo sheets

表9 竹片抗弯强度试验结果<br/>Tab.9 Bending strength of bamboo sheets

表9 竹片抗弯强度试验结果
Tab.9 Bending strength of bamboo sheets

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备注

引言

1 试验材料

2 圆竹抗压性能研究

3 圆竹的径向环刚度

4 圆竹抗弯性能强度

5 结论

期刊信息