(1 湖南城建职业技术学院建筑工程系, 湘潭 411101;2 中南林业科技大学土木工程学院, 长沙 410004)

摘要: 为研究钢板及钢板粘贴方式对小跨高比胶合木梁抗弯性能的影响,对 3 组 9 根试件进行了弯曲试验研究,其中包括未加固、底部钢板增强及两侧钢板增强小跨高比胶合木梁。 试验结果表明:3 组试件的破坏形式均为顺纹剪切脆性破坏,且受弯破坏过程中,受压区高度增大,中性轴位置均略有下移;与未加固小跨高比胶合木梁相比,底部钢板增强对其极限承载力及变形影响不大,而梁两侧钢板增强则能有效提高其极限承载力及变形能力。 结合理论分析,提出了一种基于应变的延性系数计算方法,并计算了 3 组试件的延性系数及抗弯刚度。 结果表明:与未加固小跨高比胶合木梁相比,底部钢板增强对其延性影响不大,但其抗弯刚度均值提高了 13. 8%;梁两侧钢板增强则对其抗弯刚度影响不大,但其延性系数均值提高了 19. 3%。

关键词: 小跨高比胶合木梁; 钢板增强; 弯曲试验; 理论分析; 抗弯性能

中图分类号:TU366. 3 文献标志码:A 文章编号:1002-848X(2022)24-0093-07

DOI:10. 19701 / j. jzjg. 20210164

Experimental study on flexural behavior of steel plate reinforced glulam beams with small span-to-height ratio

ZOU Yanhua1, CHEN Bowang2, LIU Chencheng2

(1 Department of Architecture and Civil Engineering, Hunan Urban Construction College, Xiangtan 411101, China;2 School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, China)

Abstract: To study the influence of steel plate and steel plate bonding method on flexural behavior of glulam beams withsmall span-to-height ratio, a total of 3 groups of 9 glulam beams with small span-to-height ratio were tested, includingunreinforced beams, beams reinforced with steel plates at the bottom, beams reinforced with steel plates on both lateralsides. The experimental results show that the failure mode of 3 groups of specimens is shear brittle failure along the grain,and the height of the compression zone increases and the neutral axis slightly moves down during the bending failureprocess; Compared with the unreinforced glulam beams with small span-to-height ratio, the glulam beams reinforced withsteel plates at the bottom has little effect on the ultimate load bearing capacity and the deformation, while the glulam beamsreinforced with steel plates on both lateral sides can effectively improve the ultimate load bearing capacity and thedeformation. Based on the theoretical analysis, a calculation method of ductility coefficient based on strain was proposed,and the ductility coefficient and flexural stiffnesses of 3 groups of specimens were calculated. The results show thatcompared with the unreinforced glulam beams with small span-to-height ratio, the glulam beams reinforced with steel platesat the bottom has little effect on its ductility coefficient, but the mean value of flexural stiffness is increased by 13. 8%,while the glulam beams reinforced with steel plates on both lateral sides has little effect on its flexural stiffness, but themean value of ductility coefficient is increased by 19. 3%.

Keywords:glulam beam with small span-to-height ratio; steel-plate reinforcement; bending test; theoretical analysis;flexural behavior

∗湖南省教育厅科学研究项目(20C0341),国家自然科学基金项目(51578554)。

第一作者:邹艳花,硕士,讲师,一级建造师,主要从事木结构及组合结构研究,Email:1165097553@ qq. com。

[引用本文] 邹艳花,陈伯望,刘陈诚. 钢板增强小跨高比胶合木梁抗弯性能试验研究[ J]. 建筑结构,2022,52(24):93-99. ZOU Yanhua,CHEN Bowang,LIU Chencheng. Experimental study on flexural behavior of steel platereinforced glulam beams with small span-to-height ratio[J]. Building Structure,2022,52(24):93-99.