摘要
目前层板胶合木梁的研究主要按照国家规范进行标准尺寸的抗弯强度试验,不能为工程中常用的大尺寸、小跨高比的胶合木梁的力学性能提供依据。针对这一问题,设计制作了3组不同梁高指接足尺层板胶合木梁,对其进行抗弯性能试验研究,着重对其抗弯性能、破坏形态及机理进行探讨,并分析截面高度对其力学性能的影响。结果表明:足尺层板胶合木梁有纯弯段梁底纤维拉断、弯剪段梁底指接纤维拉断及脱胶三种弯曲破坏形式。排除胶接质量的影响,梁高为300mm和400mm时为梁底纤维拉断破坏,梁高为500mm时为弯剪段梁底指接纤维拉断破坏,且均为脆性破坏。胶合质量是影响木梁抗弯强度的主要因素,木节、指接位置及梁高对其抗弯性能及破坏形式均有一定影响;在保证胶结质量的前提下,层板胶合木梁具有较稳定的抗弯承载力及弹性模量,且其抗弯承载力随着梁高的增大而逐渐减小。研究结果具有较强的工程应用价值,可为层板胶合木梁的工程设计及应用提供参考。
Up to now,the research on glued-laminated timber beams has mainly carried out standard size flexural strength tests in accordance with national regulations,and cannot provide a basis for the mechanical properties of glued-laminated timber beams with large dimensions and small spans and height ratios commonly used in engineering.Three groups of beams with different beam heights,altogether 6 finger-jointed full-scale GLT beams were designed and manufactured,and experimental research on their flexural behavior focusing on their flexural behavior,failure mode and mechanism were carried out,and the influence of section height on their mechanical properties were analyzed.Results show that the full-scale GLT beams have three kind of bending failure mode:fiber fracture of pure bending section,fiber fracture of bending and shearing section and glue separation.Eliminating the influence of glue quality,members with a height of 300 mm and 400 mm meet the first failure mode,and members with a height of 500 mm meet the second failure mode,and all are brittle failure.The gluing quality is the main factor that affects the bending strength of timber beams.Under the premise of ensuring the quality of gluing quality,GLT beams have stable flexural capacity and elastic modulus,which gradually decrease with the increase of beam height.The research results have strong engineering application value and can provide reference for the engineering design and application of GLT.
作者
奉佳
王雪亮
徐乾罡
王秀鑫
秦丝思
FENG Jia;WANG Xueliang;XU Qiangang;WANG Xiuxin;QIN Sisi(State Key Laboratory for Disaster Mitigation in Civil Engineering,Wuhan University of Technology,Wuhan 430070,China;Wuhan Linlang Wooden Architecture Engineering and Technology Co.,Ltd.,Wuhan 430105 China)
出处
《建筑结构》
CSCD
北大核心
2020年第S01期252-255,共4页
Building Structure
基金
国家自然科学基金资助(51208399)
湖北省自然科学基金(2018CFB645)
道路桥梁与结构工程湖北省重点实验室(武汉理工大学)开放课题基金资助项目(DQJJ201706)
关键词
层板胶合木
足尺木梁
指接
抗弯性能
glued-laminated timber
timber beams
finger joint
flexural behavior
