钢-LVL组合工字形梁受剪性能研究  

Experimental study on shear behavior of steel-LVL composite I-shaped beams

作　　者：刘宏伟[1] 吴时旭 童科挺 张家亮[2] 李玉顺 LIU Hongwei;WU Shixu;TONG Keting;ZHANG Jialiang;LI Yushun(School of Civil&Environmental Engineering and Geography Science,Ningbo University,Ningbo 315211,China;College of Science and Technology of Ningbo University,Ningbo 315300,China;School of Civil Engineering,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]宁波大学科学技术学院,浙江宁波315300 [3]青岛农业大学建筑工程学院,山东青岛266109

出　　处：《宁波大学学报（理工版）》2023年第1期57-64,共8页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：国家自然科学基金(51978345,51678310)。

摘　　要：将单板层积材(LVL)和冷弯薄壁型钢通过结构胶复合形成工字形截面的组合梁,以组合梁的剪跨比、腹板和翼缘LVL厚度为参数,对9根钢-LVL组合工字形梁进行受剪性能试验,观察其在不同荷载作用下的破坏现象、破坏形态、应力变化及挠度的发展,对受剪承载力的影响因素进行分析,并提出组合梁的跨中挠度及受剪承载力的计算方法.试验结果表明,钢-LVL组合工字形梁的整体工作性能较好,组合效应显著,其受剪承载力与剪跨比、腹板厚度及翼缘厚度有关.当剪跨比小于2.5时,试件表现为明显的剪压破坏,腹板厚度、翼缘厚度的增加以及剪跨比的减小,可以有效地提高其极限受剪承载力.提出了组合梁的跨中挠度和受剪承载力计算模型,与试验结果吻合良好,实测挠度与计算挠度误差在8%以内,受剪承载力试验值与计算值平均误差不超过10%.The laminated veneer lumber(LVL)and cold-formed thin-walled steel are bonded with structural adhesive to form a composite I-shaped beam.The 9 composite beams are tested for shear performance with different shear span ratios,web and flange thicknesses,failure patterns,and stress changes.The deflection development of composite beams under various loads is observed,and the failure mechanism of composite beams is analyzed.The influence factors of shear bearing capacity are discussed,and the calculation method is proposed for the shear capacity of composite beams.The test results show that the overall working performance of steel-LVL composite I-beam is good,and the combination effect is obvious.When the shear-span ratio is less than 2.5,the failure characteristic of the specimen is obvious shear-compression failure.The increase of web thickness and flange thickness and the decrease of shear-span ratio can effectively improve the ultimate shear capacity.The calculation model of mid-span deflection and shear capacity of composite beams is established,which is in good agreement with the experimental results.The error between measured deflection and calculated deflection is within 5%,and the average error between experimental and calculated shear capacity is less than 10%.

关 键 词：单板层积材 冷弯薄壁型钢 组合梁 剪跨比 受剪性能 

分 类 号：TU398.6[建筑科学—结构工程]