考虑剪切变形及界面滑移的双倒T型组合梁理论模型

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中图分类号：0313；TU398.6 文献标志码：A 文章编号：1000-4939（2025）06-1387-10

Abstract：In steel-concrete composite structures，due to the existence of certain interface slip and web shear deformation，the assumption of flat section is no longer applicable. In order to scientifically study the effects of shear deformation and interface slip on the deflection and interface slip of composite beams， this paper adopts Goodman's assumption and Timoshenko beam's double generalized displacement assumption，introduces the strain relationship of composite beams and element microsegment mechanical equilibrium，and derives the elastic bending diferential equation of double inverted T-shaped steel-concrete composite beams considering shear deformation and interface slip. Then based on the equivalent spring model and theequivalent rod spring model，a theoretical calculation formula for the elastic shear stifess of the embedded web connection is derived.By using the known deformation and constraint conditions of the composite beam，we obtain the analytical solution of deflection and slip of the simply supported composite beam under concentrated load in the span and verify it through the experimental results of four double inverted T-shaped steel-concrete composite beams with diffrent parameters. The results show that the deflection and slip values obtained from theoretical calculations are in good agreement with the measured values，and the correctness of the theoretical calculation formula for the elastic shear stiffness of the embedded web connection is verified. In the deflection deformation of double inverted T-shaped composite beams，the deflection value caused by bending accounts for about 56% of the total deflection， the deflection value caused by interface slip accounts for about 36% of the total deflection，and the deflection value caused by shear deformation accounts for about 8% of the total deflection. This article comprehensively considers the effects of shear deformation and interface slip on the deflection and slip of composite beams， and makes a significant improvement compared to the model structure that does not consider shear deformation and interface slip.

Key words：double inverted T-shaped stee-concrete composite beam；shear deformation； elastic shearstiffness ； deflection；slip

传统的T型钢-混组合梁易发生倾覆及钢腹板屈曲破坏，且一般采用栓钉剪力连接件进行钢混连接，焊接工作量大，焊接疲劳效应显著。（剩余10740字）