古建筑旧木材材料性能试验研究

Experimental Study on Properties of Aged Wood of Ancient Architecture

由于木材材质的特殊性,中国古建筑木结构在外界因素影响下,其物理力学性能发生较大变化。通过对古建筑旧木材及对比新木材的材性试验,得到了旧木材各项力学指标的变化趋势。试验表明:与新木材相比,旧木材的顺纹抗压强度、横纹强度、抗弯强度、抗弯弹性模量均有所降低,其中,横纹抗压强度降低幅度最大,顺纹抗压强度降低最小;同时,分析了含水率对新、旧木材顺纹抗压强度、干缩率的影响。试验结果可为今后古建筑木结构的维修与加固提供参考。

Because of the timber particularity,the physical and mechanical properties of Chinese ancient timber structures have changed largely under the influence of the environment.The properties of aged wood and fresh wood are tested,and the changed trend of every kind of strength is analyzed.The test results indicate that： the compressive strength parallel to grain of wood,the compression perpendicular to grain of wood,the bending strength of wood and the modulus of elasticity in static bending of wood are reduced.The reduced extent of the compression perpendicular to grain of wood is largest,and the reduced extent of the compressive strength parallel to grain of wood is least.The influence of the compressive strength parallel to grain of wood and the shrinkage of wood from the water ratio are analyzed.The testing results can be a reference for the strengthening and rehabilitation of the timber structure.