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木结构构件由于荷载和温、湿度变化等作用易在端部及中部发生平行于构件纵轴的裂缝,导致缝端应力集中以及削弱裂缝两侧木材的变形协调,进而降低承载力.开展了带纵缝木梁足尺试件弯曲加载试验和木材清样小试件材性实验,考虑了不同试件材性的差异和木材材料强度的尺寸效应,确定了纵缝长度和位于梁截面高度处的位置等参数对木梁承载力的影响,并分析了采用新型自攻螺丝修复后带纵缝木梁的承载力恢复性能.研究表明,纵缝位于木梁剪弯段截面中部的影响最大,承载力下降可达46.2%;在弯剪段施加自攻螺丝的修复效果最好,其修复率随自攻螺丝间距增大而减小.采用200mm间距时木梁承载力修复率可达1.12.
Due to the load, temperature and humidity changes, the wood structural members are prone to crack in the end and middle parallel to the longitudinal axis of the member, resulting in stress concentration in the joint and weakening the deformation coordination of the wood on both sides of the crack, thus reducing the bearing capacity. Longitudinal slit beam bending test and wood specimen testing of small specimens, taking into account differences in the material properties of different specimens and the size effect of wood material strength, to determine the length of the longitudinal slit and located at the height of the beam section Location and other parameters on the bearing capacity of the beam and analyzed the bearing capacity restoration performance of the beam with the longitudinal seam after the new self-tapping screw was repaired.The results show that the longitudinal seam is located in the middle of the section of the beam, The force reduction can reach 46.2%, the self-tapping screw is the best in the bending section, and its repair rate decreases with the increase of the self-tapping screw spacing.The recovery rate of wood beam bearing capacity with the distance of 200mm can reach 1.12.