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侧压竹集成材弦向偏压试验研究
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Experimental Study on Side Pressure LBL under Tangential Eccentric Compression
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    为了研究侧压竹集成材弦向偏压的力学性能,考虑偏心距的变化,设计18个长细比为36、截面为77 mm×77 mm、弦向偏压的竹集成材柱试件,进行试验研究与分析.结果表明:弦向偏压竹集成材柱的竹片接长部位或竹节部位为受拉区域的薄弱部位,其位置决定了偏压柱的破坏形式.随着偏心率的增大,C面的纵向和横向极限应变绝对值呈上升趋势,而A面及两侧面B面和D面的纵向和横向极限应变绝对值呈下降趋势.对于纵向极限应变,偏心距较小试件的试验结果离散性较大;对于横向极限应变,所有试件试验结果的离散性均较大.偏心距较小时,试件的极限承载力下降较快且离散性较大;偏心距较大时,极限承载力下降较慢.弦向偏压柱试件跨中截面平均应变基本上呈现线性分布,符合平截面假定.给出了弦向偏压竹集成材柱承载力计算公式,公式计算结果与试验结果吻合良好.

    Abstract:

    In order to investigate the eccentric compression performance of side pressure laminated bamboo lumber (LBL), 18 LBL column specimens with the slenderness ratio of 36 and cross-section of 77 mm × 77 mm were designed considering different eccentricity, and loaded under tangential eccentric compression. The test results show that the bamboo-strip connections and bamboo joints are the weak zones for the LBL columns under tangential eccentric compression, which determine the failure modes. The ultimate longitudinal and lateral strains for Face C increased with the increase of the eccentricity ratio, while these values for Face A, Face B, and Face D decreased. The discreteness for the ultimate longitudinal strain of the specimens with small eccentricity was relatively large. However, the ultimate lateral strain values for all specimens exhibited obvious discreteness. After the ultimate strength, the load-carrying capacities of the specimens with small eccentricity decreased significantly compared with those of the specimens with large eccentricity. However, the smaller eccentricity resulted in more evident discreteness of the ultimate load values. In addition, the strain was distributed linearly at the cross-section of the columns, which satisfies the plane-section assumption. Furthermore, an equation to predict the eccentricity influencing coefficient on the bearing capacity of laminated bamboo lumber columns was proposed. The predictions gave a good agreement with the test results.

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李海涛,吴刚,张齐生,陈国.侧压竹集成材弦向偏压试验研究[J].湖南大学学报:自然科学版,2016,43(5):90~96

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  • 在线发布日期: 2016-06-03
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