(1 苏州昆仑绿建木结构科技股份有限公司,苏州 215105;2 苏州科技大学江苏省结构工程重点实验室,苏州 215011)

摘要: 采用自攻螺钉对胶合木梁侧进行横纹增强,并开展 4 组(含未增强组)胶合木梁侧横纹承压试验.结果表明,3 种增强方式对胶合木梁侧的横纹承压性能均有不同程度提高,单侧通长贯入螺钉组试件最终发生了局部屈曲破坏,而其他组螺钉变形不明显;相比于未增强组试件,单侧通长贯入螺钉、双面贯入螺钉和双侧斜交螺钉组试件的横纹承压荷载分别提高了 25.9%、34.5%和 44.8%;单侧通长贯入螺钉组试件表现出了最高的等效横纹承压弹性模量,为 333.6N/ mm2,而其他两种增强方式的等效横纹承压弹性模量略低于未增强组试件.荷载-应变关系表明,自攻螺钉的引入能有效改善承压面下木材应变的分布.采用欧洲标准 EN 408 与 ISO 13910 标准获得的横纹承压强度较为接近,而按照«木结构试验方法标准»(GB/ T 50329—2012)获得的结果偏于保守;有限元模型总体上能有效预测自攻螺钉增强后的胶合木梁侧横纹承压性能.

关键词: 胶合木;自攻螺钉;横纹承压;局部变形

中图分类号:TU366 文献标志码:A 文章编号:1002-848X(2022)18-0138-05

DOI:10.19701 / j.jzjg.20210463

Experimental study on compressive bearing capacity of glulam strengthened by self-tappingscrews along glued seam

ZHOU Jinjiang1,YANG Shuhan1,JI Wei1,LING Zhibin2

(1 Suzhou Crownhomes Co. ,Ltd. ,Suzhou 215105,China;2 Jiangsu Key Laboratory of Structure Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)

Abstract: Self-tapping screws were used to strengthen the lateral side of the glulam beam perpendicular to grain,andlateral bearing tests on the glulam beams perpendicular to grain were carried out on four groups of glulam beams includingthe non-strengthened group. The results show that the three strengthening methods can improve the bearing performance ofthe glulam beams perpendicular to grain to different degrees. The specimens in the unilateral long-penetrating screw groupeventually have local buckling failure,while the other groups have no obvious deformation. Compared to non-strengthenedgroup,the compression loading perpendicular to grain of the strengthened groups of specimens can be improved by 25.9%for fully penetrated self-tapping screws,34.5% for double-sides drilled self-tapping screws and 44.8% for cross-drilledself-tapping screws. The specimens with fully penetrated self-tapping screws exhibit the highest average equivalentcompression modulus perpendicular to grain of 333.6 N/ mm2. The other two strengthened groups show slight low equivalentcompression modulus perpendicular to grain compared to the non-strengthened group. The load-strain relationship indicatesthat the use of self-tapping screws can redistribute the compression strain perpendicular to grain under the bearing areaeffectively. The compression intensity of pressure perpendicular to grain calculated according to European standard EN 408is close to that obtained by ISO 13910 standard;however,the result based on the standard for test methods of timberstructures (GB/ T 50329—2012) is conservative. The numerical model is generally able to predict the lateral compressivebehavior of the glulam beams perpendicular to grain strengthened by self-tapping screws.

Keywords:glulam;self-tapping screw;compression perpendicular to grain;local deformation

∗国家自然科学基金青年基金资助项目(51708382),江苏省自然科学基金项目(BK20221387),江苏省“六大人才高峰”资助项目(JZ-038).

第一作者:周金将,硕士,工程师,主要从事木结构设计与施工研究,Email:zhou. jinjiang@ crownhomes. cn.

[引用本文] 周金将,杨舒涵,纪微,等. 自攻螺钉增强胶合木沿胶缝横纹受压承载力试验研究 [J]. 建筑结构,2022,52(18):138-144,132. ZHOU Jinjiang,YANG Shuhan,JI Wei,et al. Experimental study on compressive bearing capacity ofglulam strengthened by self-tapping screws along glued seam[J]. Building Structure,2022,52(18):138-144,132.