| 摘要: |
| 为了研究竹重组材柱偏心受压的力学性能，选稍部原竹制作竹重组材试件进行试验研究与分析，探讨了其偏心受压破坏机理.结果发现，偏心距较小试件的破坏大多因柱中部首先出现裂缝而导致，偏心距较大试件的破坏大多因牛腿附近首先出现裂缝并向柱中部延伸而导致；试件的刚度和极限荷载随着偏心距的增大而减小；荷载较小时，试件侧向挠度曲线基本符合正弦半波曲线，达到极限荷载附近时接近三角形；偏心受压柱的跨中截面平均应变基本上呈线性分布，符合平截面假定.同时，给出了考虑偏心距影响系数的竹重组材柱极限承载力计算公式，该公式的计算结果与试验结果吻合良好. |
| 关键词: 竹重组材 偏心受压 相对偏心率 挠度 |
| DOI：103969/j.issn1007 9629201603025 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51308301）；江苏省自然科学基金资助项目（BK20130978）；教育部博士点新教师基金资助项目（20123204120012）；住建部科技项目（2014k4023）；江苏高校优势学科建设工程资助项目（PAPD） |
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| Experimental Study on PSBL under Eccentric Compression |
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LI Haitao1, WEI Dongdong2, SU Jingwen1, YUAN Conggan2, CHEN Guo1
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1.School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China;2.Jiangxi Feiyu Bamboo Product Co., Ltd., Fengxin 330700, China
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| Abstract: |
| In order to investigate the mechanical performance of parallel bamboo strand lumber (PBSL) column under eccentric compression, the specimens were made of the top part of the original bamboo and a series of axial compression tests were conducted. Then the failure mechanism for the specimens was studied in detail. The test results show as follows：the cracks appear firstly in the middle part of the column, particularly for the specimen with small eccentricity; the cracks firstly close to the bracket particularly for the specimen with big eccentricity; the stiffness and ultimate load decrease as the increase of the eccentricity; the test deformation curves for the columns are close to the sine half wave line when the load is small, however, the deformation curves are close to the triangle closing to the ultimate load. In addition, the strain is distributed linearly across the cross section of the columns and obeys the plain section assumption. An equation for calculating the ultimate capacity of PBSL columns is proposed considering the eccentricity influencing coefficient. The calculation results obtained from the equations give a good agreement with the test results. |
| Key words: parallel bamboo strand lumber(PBSL) eccentric compression relative eccentric ratio deflection |
