聚脲加固木柱轴心受压性能试验研究

Experimental Study on Axial Compression Performance of Polyurea Reinforced Timber Columns

聚脲为绿色环保涂料,喷涂方便,具有较好的韧性、抗腐蚀性和热稳定性。为研究聚脲作为加固材料时木柱加固效果,通过改变聚脲喷涂方式和厚度,设计制作了5种不同加固方式木柱试件,进行轴向静力加载试验,分析各试件破坏形态,并对试件荷载-位移曲线、极限承载力、位移延性系数和刚度等力学性能进行分析。研究结果表明,聚脲与木材具有较好的黏结性,聚脲涂层可与木柱协同受力,改善木材力学性能;采用聚脲加固后木柱承载力和位移延性均有所提高,其中平均极限荷载提高幅度为21.33%~35.58%,平均位移延性系数提高幅度为4.17%~30.83%;间隔喷涂聚脲加固方式较柱身全涂聚脲加固方式对木柱承载力的提升作用更大。

Polyurea is a green environmentally friendly coating,easy to spray,with good toughness,corrosion resistance and thermal stability.In order to study the effect of wood column reinforcement when polyurea is used as a reinforcement material,five specimens of wood columns with different reinforcement methods were designed and produced by changing the spraying method and thickness of polyurea,axial static loading test was carried out to analyse the damage morphology of each specimen and the mechanical properties such as specimen load and displacement curves,ultimate bearing capacity,displacement ductility coefficients and stiffness were analysed.The research results show that the polyurea and wood have good adhesion,and the polyurea coating can be synergistically loaded with the wood column to improve the mechanical properties of wood.The load carrying capacity and displacement ductility of wood columns are improved after polyurea reinforcement,in which the average ultimate load is increased by 21.33%~35.58%,and the average displacement ductility coefficient is increased by 4.17%~30.83%.The spaced spraying polyurea reinforcement has a greater effect on the enhancement of the load carrying capacity of wooden columns than the fully coated polyurea reinforcement of the column.