钢板增强胶合木梁的抗弯性能

发布时间：2018-01-07 09:15

本文关键词：钢板增强胶合木梁的抗弯性能　出处：《吉林大学学报(工学版)》2017年02期 　论文类型：期刊论文

【摘要】：为了改善普通胶合木梁的受力性能,提出了在其底部粘贴钢板或增设螺钉的增强方式,从而形成钢板增强胶合木梁。进行了21根梁的抗弯试验,分析了钢板厚度、是否设置螺钉对梁破坏形态、承载力和变形能力的影响,并与普通胶合木梁进行对比。结果表明:粘贴2、3和4mm厚钢板增强后,梁承载力分别提高了73.3%、90.0%和71.0%,随着钢板厚度的增加,承载力先增大后减小;粘贴同厚度钢板并设置螺钉后,梁承载力分别提高了76.4%、96.9%和148.6%,随着钢板厚度的增加,承载力增大,螺钉的增强效果在钢板较厚时表现明显。钢板增强后,梁的极限变形比普通胶合木梁提高了6.2%~61.1%,钢板厚度和是否设置螺钉对梁变形能力的影响与其对承载力的影响类似。在验证了钢板增强胶合木梁基本符合平截面假定后,提出了此类构件的受弯承载力计算公式,并与试验结果进行对比,结果表明,理论值与试验值的平均误差不大于10%。
[Abstract]:In order to improve the mechanical properties of the general glued wood beams, a reinforcement method of sticking steel plates or adding screws to the bottom of the beams was put forward to form the steel plate reinforced glued wood beams. The bending tests of 21 beams were carried out. The influence of steel plate thickness and screw on the failure form, bearing capacity and deformation ability of the beam is analyzed. The results show that the steel plate with 2mm thickness and 4mm thick steel plate is reinforced with the ordinary glued wood beam. The bearing capacity of the beam increased by 90.0% and 71.0%, respectively. With the increase of the thickness of the steel plate, the bearing capacity increased first and then decreased. The bearing capacity of the beam increased by 76.44% and 148.6% respectively after the steel plate with the same thickness and screws were set. With the increase of the thickness of the steel plate, the bearing capacity increased. The reinforcing effect of screw is obvious when the steel plate is thicker. The ultimate deformation of the beam is increased by 61.1% than that of the ordinary glued wood beam after the steel plate is strengthened. The effect of plate thickness and whether or not screws on the deformation capacity of beam is similar to that of bearing capacity. After verifying that the steel plate reinforced glued wood beam basically conforms to the assumption of plane section. The formula for calculating the flexural capacity of this kind of members is proposed and compared with the experimental results. The results show that the average error between the theoretical value and the experimental value is not greater than 10.
【作者单位】：东北林业大学工程技术学院;牡丹江师范学院;
【基金】：国家自然科学基金项目(51208083) 国家林业局林业项目科学技术研究项目(2014-04)
【分类号】：TU366.3
【正文快照】： 0引言现代木结构建筑低碳环保、生态宜居,且抗震性能优越[1-3],是绿色建筑的重要形式之一。胶合木材料具有截面尺寸不受限制、缺陷分散、可用强度高、便于利用小径材和劣质材等优点,是现代木结构中的常用材料。作为结构中的主要水平受力构件,普通胶合木梁受弯时,大多发生由于

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