钢-单板层积材组合工字形梁受弯性能试验  

Experimental Study on Flexural Properties of Steel-LVL Composite I-Beams

作　　者：许佳乐 邬沛 唐政烽 童科挺 李玉顺 XU Jiale;WU Pei;TANG Zhengfeng;TONG Keting;LI Yushun(School of Civil&Environmental Engineering and Geography Science,Ningbo University,Ningbo 315211,China;College of Civil Engineering&Architecture,Qingdao Agricultural University,Qingdao 266109,China)

机构地区：[1]宁波大学土木工程与地理环境学院,浙江宁波315211 [2]青岛农业大学建筑工程学院,山东青岛266109

出　　处：《森林工程》2024年第6期185-195,共11页Forest Engineering

基　　金：国家自然科学基金项目(52278264,51978345)。

摘　　要：将单板层积材(laminated veneer lumber,LVL)和冷弯薄壁型钢通过结构胶复合构成工字形截面的钢-木组合梁,以梁的LVL板厚度、截面高度、薄壁型钢厚及翼缘LVL宽度等尺寸为参数,对9根钢-LVL组合工字形梁进行受弯性能试验,观察试件的破坏形态、挠度发展、应变分布和承载能力,对影响其受弯承载力的因素进行分析,并提出考虑滑移效应的跨中挠度计算公式。研究结果表明,钢-LVL组合梁具有良好的整体工作性能,破坏前变形能力较强,其受弯时最典型的破坏模式为下翼缘LVL被拉断,材料性能得到充分发挥,表现出较好的延性。增大截面高宽比、腹板高厚比,减小翼缘宽厚比可以提高组合梁的抗弯承载能力。LVL和型钢之间的滑移会降低组合梁的刚度,与未考虑滑移的结果相比,考虑界面滑移效应的组合梁跨中挠度理论计算结果更接近梁的真实变形,计算精度提高2.38%。The steel-wood composite beam with I-section is made of laminated veneer lumber(LVL)and cold-formed thin-wall steel by structural adhesive.The flexural properties of nine composite beams are tested with parameters such as LVL plate thickness,section height,thin wall steel thickness and flange LVL width.The failure forms,deflection development,strain distribution and bearing capacity of specimen are observed,the influence factors of flexural property are analyzed,and a formula for calculating midspan deflection considering the slip effect is proposed.The results show that steel-LVL composite beams have good overall working performance.The composite beam has a high deformation ability before failure,and the most typical failure mode is the lower flange LVL fracture.The material properties are fully utilized,showing good ductility.The flexural bearing capacity of composite beams can be improved by increasing the ratio of section height to width and web height to thickness and reducing the ratio of flange width to thick⁃ness.The slip between the LVL and the section steel reduces the stiffness of the composite beam.Compared with the results without taking slip into account,the theoretical calculation results of mid-span deflection of composite beam with interface slip effect are closer to the real deformation,and the calculation accuracy is improved by 2.38%.

关 键 词：单板层积材 冷弯薄壁型钢 组合梁 受弯性能 跨中挠度 滑移 

分 类 号：TU398.9[建筑科学—结构工程]