粘贴TiO_(2)接枝改性亚麻纤维对胶合木柱轴压性能的影响

Effect of TiO_(2) of Axial Compression Performance of Graft Modified Flax Fiber Reinforced Glulam Column

以樟子松锯材为基材制作27根正方形普通胶合木柱(柱横截面尺寸100 mm×100 mm、柱长700 mm,倒角半径为5 mm),其中3根为对照柱(未粘贴增强材料);采用101号亚麻纤维坯布制作的TiO_(2)接枝改性亚麻纤维布为增强材料,以螺旋间隔、螺旋连续、环向间隔、环向连续粘贴形式粘贴3层和6层制作增强胶合木柱各3根(24根);应用量程100 mm的位移计测量试件在轴压状态下的整体位移,设置应变片测量试件加载过程中的变形量;在2000 kN微机控制电液伺服万能试验机上进行轴压性能试验,测试并计算破坏形态、极限承载力、延性系数及荷载-位移、荷载-应变曲线,分析不同粘贴层数和粘贴形式的TiO_(2)接枝改性亚麻纤维对胶合木柱轴心受压性能的影响。结果表明:采用改性亚麻纤维增强胶合木柱,可提高其极限承载力与刚度。当粘贴层数相同时,连续粘贴形式对胶合木柱的承载力提高幅度,大于间隔粘贴形式;而环向粘贴形式的增强效果,优于螺旋粘贴形式。在粘贴形式相同时,平均极限承载力随着改性亚麻纤维布粘贴层数的增加而提高。增强柱平均延性系数提高幅度介于10.22%~68.17%之间,其中间隔粘贴组的延性系数随层数的增加而减小,而连续粘贴组的延性系数随粘贴层数的增加而增大。

Pinus sylvestnis var.mongolica Litv.was utilized to produce 27 square ordinary glulam columns(parameters:column cross-sectional dimensions 100 mm×100 mm,column length 700 mm,and chamfer radius 5 mm),three of which were in the control group(no reinforcement material).The reinforcing material was TiO_(2) grafted modified flax fiber manufactured from No.101 flax fiber.To manufacture reinforced glulam columns,three or six layers of the reinforcing material paste were applied in the form of spiral interval gluing form,spiral continuous gluing form,circumferential interval gluing form,and circumferential continuous gluing form.A total of 24 columns were prepared in three columns under each condition.The displacement of the specimen under axial compression was measured by a displacement meter with a measuring range of 100 mm,and the strain gauge was set to measure the deformation of the specimen during loading.A displacement meter with a measuring range of 100 mm was used to measure the displacement of the specimen under axial compression,and a strain gauge was used to detect the deformation of the specimen during loading.The axial compression performance test was carried out on the 2000 kN microcomputer controlled electro-hydraulic servo universal testing machine,and the failure form,ultimate bearing capacity,ductility coefficient,load displacement and load strain curve,among other things of columns,were studied.The effects of different layers and different forms of TiO_(2) grafted flax fiber on the axial compressive properties of glulam columns were analyzed.The results show that the ultimate bearing capacity and rigidity of the glulam columns reinforced can be improved by modified flax fiber;when there are the same number of gluing layers,the continuous gluing form outperforms the interval gluing form in terms of bearing capacity,whereas the circular gluing form outperforms the spiral gluing form in reinforcing.When the gluing forms are same,the average ultimate bearing capacity improves as the adhesive layers of modified linen increases;the average ductility coefficient of the reinforced column grows from 10.22%to 68.17%,and the ductility coefficient of the interval paste group declines with the increasing of the number of layers,while the ductility coefficient of the continuous paste group increases with the number of layers increasing.