摘要
为解决叠箱模块化钢结构体系模块间约束较弱的问题,提出上下模块方钢管梁叠合受力的连接方法,通过试验与有限元参数分析研究了简支叠合钢梁的受弯性能,考察了连接位置、螺栓数量、钢梁尺寸等因素的影响.试验结果表明:试验构件出现2种典型破坏模式,即钢梁屈服和连接件剪切破坏;抗剪连接可阻止上下梁间的滑移,有效提高叠合钢梁的受弯性能,强连接叠合梁抗弯承载力比无连接叠合梁提高了26.67%,初始抗弯刚度提高了70.65%.参数分析表明:随弯剪段螺栓数量增加,叠合梁的受弯性能比无连接叠合梁有明显提升;每个弯剪段连接处各设置4个直径20 mm的螺栓,且连接板长、板厚分别为240 mm,8 mm时,上下梁间有较好的协同受弯性能.叠合钢梁协同受弯机理为:叠合梁间的抗剪连接阻止了上下梁间相对滑移,对上梁产生偏心压力,对下梁产生偏心拉力.随着连接作用的增强,上下梁的中和轴均趋近叠合面,从而使上梁呈现压弯受力的特征,下梁则呈现拉弯受力的特征.
To solve the problem of weak constraints between modules of modular steel structure system,the connection method of laminated steel square hollow section beams in the upper and lower modules was proposed.The flexural behavior of simply supported laminated steel beams was studied by experiment and finite element parameter analysis.The effects of connection position,number of bolts and size of steel beam were investigated.The test results show that:Steel beam yield and connector shear failure are the two typical failure modes.The shear connection prevents the slip between the upper and lower beams and effectively improves the bending performance of the laminated steel beam.The bending strength and initial stiffness of laminated beam with strong connections are 26.67%and 70.65%higher than the non-connection laminated beam,respectively.The parametric analysis shows that the flexural performance of the laminated steel beam improves apparently with the increase of the number of bolts in the bending-shear zone.The upper and lower beams have better cooperative bending performance when laminated steel beam connected by four bolts of 20mm in diameter,and the connecting plate of 240mm and 8mm in length and thickness,respectively.The bending mechanism of the laminated steel beams is that the relative slip between the upper and lower beams is prevented by the shear connection,which produces eccentric pressure on the upper beam and eccentric tension on the lower beam.With the enhance of the connection,the neutral axes of each beam approaching to the laminating surface,and thus the upper beam presents a compression-bending state,the lower beam presents a tension-bending state.
作者
常鸿飞
胡磊
宋心怡
秦福阳
安爱臣
张少华
CHANG Hongfei;HU Lei;SONG Xinyi;QIN Fuyang;AN Aichen;ZHANG Shaohua(Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;State Key Laboratory of Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Sichuan Provincial Architectural Design and Research Institute Co.,Ltd.,Chengdu,Sichuan 610000,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2023年第3期540-549,共10页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51978657)。
关键词
钢箱模块
方钢管
叠合钢梁
受弯性能
试验
参数分析
steel box module
square tubular
laminated steel beam
flexural performance
test
parametric analysis
