冷弯薄壁型钢-胶合木组合梁受弯性能  

Bending performance of cold-formed thin-walled steel-glulam composite beams

作　　者：杨海旭[1] 郭悦 王海飙[1] 胡宜 YANG Hai-xu;GUO Yue;WANG Hai-biao;HU Yi(College of Civil Engineering and Transportation,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学土木与交通学院,哈尔滨150040

出　　处：《吉林大学学报(工学版)》2024年第12期3513-3525,共13页Journal of Jilin University:Engineering and Technology Edition

基　　金：中建集团研发青年项目(CSCEC-2022-Q-43);中国建筑科学研究院城市改造与智能运营工程研究中心项目(CSCEC-PT-015)。

摘　　要：将冷弯薄壁型钢与胶合木通过不同连接方式组合成新型箱形截面组合梁,以钢木连接方式和钢材卷边尺寸为变量,对4根组合梁进行了三分点弯曲试验,探究组合梁的破坏机理及力学性能。试验结果表明:组合梁整体工作性能好、变形协调,组合梁最终以纯弯段下翼缘胶合木断裂而破坏;不同连接方式下,胶粘连接的组合梁相较于螺栓连接和自攻螺钉连接的组合梁极限抗弯承载力分别提高了61.5%和23.0%;同为胶粘连接的组合梁,增大钢材卷边尺寸后其极限抗弯承载力只提升了9.0%。在试验基础上建立组合梁有限元模型进行分析,模拟结果与试验结果吻合良好;有限元模拟结果表明:钢材强度、钢材厚度以及胶合木厚度均对组合梁的抗弯承载力有一定的影响,其中胶合木厚度的影响最大。结合试验结果和模拟分析提出了冷弯薄壁型钢-胶合木组合梁跨中挠度和抗弯承载力计算公式,结果表明理论值与模拟值吻合良好,可为工程实践提供一定参考。Cold-formed thin-walled steel and glued wood were combined into a new type of box-section beam through different connection methods.Taking the steel and wood connection methods and steel crimp size as variables,three-point bending tests were carried out on four combined beams to investigate the damage mechanism and mechanical properties of the combined beams.The test results show that the overall performance of the combined beams is good,the deformation is coordinated,and the combined beams are finally destroyed by the fracture of the glued timber at the lower flange of the pure bending section.Under the different connection modes,the ultimate bending capacity of the glued-connected combined beams were improved by 61.5%and 23.0%compared with the bolted-connected and tapping screw-connected ones,respectively,in the same way as the glued-connected combined beams,the bending capacity of the combined beams is only improved by 9.0%by enlarging the dimensions of the steel crimps.A finite element model of the combined beam was established based on the test,and the simulation results were in good agreement with the test results.The finite element simulation results showed that the steel strength,steel thickness,and thickness of glued wood all had a certain effect on the bending capacity of the combined beam,with the thickness of glued wood having the greatest effect.Combined with the test results and simulation analysis of the cold-formed thin-walled steel-glued laminated timber combination beam span deflection and flexural capacity calculation formula,the theoretical values and simulation values are in good agreement,which can provide a certain reference for engineering practice.

关 键 词：结构工程 组合结构 钢-木组合梁 抗弯性能 

分 类 号：TU366.3[建筑科学—结构工程]