【摘要】 通过5个足尺重组竹受弯构件的试验与理论分析,详细研究了重组竹的抗弯性能。研究表明,重组竹受弯构件的典型破坏形态是底部竹纤维拉断和中性轴附近层间剪切破坏,重组竹受弯构件的设计由截面刚度控制,对应挠度限值L/250的荷载值PL/250与极限荷载Pmax的比值有较好的稳定性,通过回归建立了重组竹抗弯强度fm与弹性模量E的相关关系模型,弹性模量表达的刚度能够准确预测承载力;对于重组竹受弯构件,平截面假定依然成立;参考木结构设计计算方法,考虑竹材重组竹的材料特性,给出了重组竹受弯构件的计算方法,初步建议了重组竹抗弯强度设计值、顺纹抗剪强度设计值、弹性模量E的设计指标。更多还原

【Abstract】 The bending tests and theoretical analysis of five full-scale bamboo scrimber components were conducted and the flexural behavior of bamboo scrimber was researched in detail.Results show that the typical failure modes of bamboo scrimber flexural components are the bamboo fiber fracture at the bottom and interlaminar shear failure near the neutral axis.The sectional stiffness control the design for the bamboo scrimber flexural components,the ratio of PL/250 of the load corresponding to the deflection limit value of L/250 and ultimate load Pmaxhas good stability.The relationship model of bending tensile strength fm and elastic modulus E was established by regression,which shows that the sectional stiffness expressed by the elastic modulus could predict the bearing capacity well.The plane-section assumption is still valid.The bamboo calculation methods of scrimber flexural components were proposed considering the materials properties of bamboo scrimber based on wood structure design methods.The design value of bamboo bending strength,shear strength parallel to grain and the elastic modulus E were presented preliminarily.更多还原