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对于箱型组合结构,由于应力分布不均,极易导致翼板及底板发生剪切变形,从而对结构安全不利。为了深入探讨单箱双室组合结构中剪滞效应的机理,根据该类结构的受力变形特点,建立混凝土翼板和单箱双室钢梁的纵向翘曲位移模式,得到了控制微分方程及其边界条件,并推导出了在对称荷载作用下单箱双室组合结构的应变及挠度的解析表达式。开展了室内足尺寸模型试验,与剪滞效应理论进行了对比研究,应变、挠度计算值的最大相对误差分别达到15.32%和16.97%。可为该类结构中剪滞效应研究及单箱双室组合结构的工程设计、后期加固提供一定的参考。
For the box-type composite structure, due to the uneven distribution of the stress, it is easy to cause the flange and the base plate to be sheared and deformed, which is disadvantageous to the structural safety. In order to investigate the mechanism of shear lag effect in single-box and double-chamber composite structures, according to the characteristics of the deformation of such structures, the longitudinal warping displacement modes of concrete flanges and single-box double-chamber steel beams are established, and the governing differential equations The boundary conditions are derived and the analytical expression of the strain and deflection of the single-box double-chamber composite structure under symmetrical load is deduced. The indoor full-size model test was carried out and compared with the shear lag effect theory. The maximum relative errors of the calculated values of strain and deflection reached 15.32% and 16.97% respectively. It can provide a reference for the study of shear lag effect in this kind of structure and the engineering design and post-reinforcement of single box double chamber composite structure.