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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.
In order to study the mechanical properties of eccentric compression of bamboo column, a few bamboo samples were made from bamboo for experimental study and analysis, and the mechanism of eccentric compression failure was discussed. The results showed that the damage of the sample with smaller eccentricity Mostly due to the first cracks in the middle of the column, the eccentricity is larger. The failure of the specimens is mostly caused by the first cracks near the legs and extending to the middle of the column. The stiffness and ultimate load of the specimens decrease with the increase of eccentricity When the load is small, the curve of the lateral deflection of the test piece is almost in accordance with the half-sine curve of the sine curve and reaches the triangle near the limit load. The mean strain of the cross-section of the eccentric column is basically linear and conforms to the assumption of flat section. The formula for calculating the ultimate bearing capacity of bamboo reorganized timber columns considering the coefficient of influence of eccentricity is given. The calculated results are in good agreement with the experimental ones.