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鉴于蝶撑桁架梁的连接件和弦管之间采用半刚性连接,且桁架梁主要由其跨中挠度控制设计,因此该文在试验研究的基础上,针对此结构的跨中挠度计算方法进行了研究。通过借鉴钢-混凝土组合梁跨中挠度的分析方法,在考虑上下弦管之间错动位移的基础上,以桁架梁微段为受力单元,推导出均布荷载作用下简支蝶撑桁架梁由错动位移引起的附加曲率,继而利用共轭梁法求得桁架梁跨中挠度的计算公式,并将公式计算值和试验及有限元分析值进行了对比。结果表明:该计算公式计算效果理想,可为该类型桁架梁的研究及实际工程应用提供理论依据。
In view of the semi-rigid connection between the chords of the butterfly truss girder and the chord, and the truss girder is mainly designed by the mid-span deflection control, based on the experimental study, the calculation method of the mid- the study. Based on the analysis of the mid-span deflection of steel-concrete composite beams, considering the displacement of the upper and lower chords, the truss girder micro-section is used as the force receiving unit, and the simply supported butterfly truss The additional curvature caused by the misalignment of the beam is obtained. Then the formula of the mid-span deflection of the truss girder is calculated by the conjugate beam method. The calculated values are compared with the experimental and finite element analysis. The results show that the calculation results are satisfactory and can provide a theoretical basis for the research and practical application of this kind of truss girder.