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组合框架梁的抗剪连接件在使用阶段将发生变形,导致构件的挠度增大,按照完全组合的换算截面法计算组合梁的挠度将得到不安全的计算结果。该文首先对考虑滑移效应的框架组合梁刚度进行研究,根据弹性理论推导了传统的完全组合梁TBM(Traditional Beam Model)模型滑移组合梁SLM(Slip Beam Model)模型的基本方程,并采用有限元方法对理论模型进行验证,说明了理论模型的准确性及合理性。对考虑滑移效应的组合框架梁刚度折减系数进行参数分析,研究了楼板的宽跨比、楼板宽厚比、板梁高度比等无量纲参数对考虑滑移效应后组合梁刚度折减系数的影响。研究发现:影响组合框架梁刚度折减系数的关键参数为抗剪连接件的剪力连接程度。在此基础上,建议了考虑滑移效应的钢-混凝土框架组合梁折减刚度系数的简化公式,公式计算结果与试验结果吻合良好,可以为组合梁的研究及设计人员提供参考。
The shear connection of the composite frame beam will be deformed in the use phase, resulting in the increase of the deflection of the component. Calculating the deflection of the composite beam according to the completely combined converted section method will result in unsafe calculation results. Based on the theory of elasticity, the basic equations of SLM (Slip Beam Model) for the traditional composite beam TBM (Traditional Beam Model) model are deduced. The finite element method is used to verify the theoretical model, which shows the accuracy and rationality of the theoretical model. The parameters of the stiffness reduction coefficient of the composite frame girder considering the sliding effect are analyzed. The effects of the non-dimensional parameters such as floor span ratio, floor aspect ratio, height-to-height ratio of slab on the stiffness reduction coefficient influences. It is found that the key parameter that influences the stiffness reduction coefficient of composite frame beam is the shear connection degree of shear connector. On this basis, a simplified formula for reducing the stiffness coefficient of steel-concrete frame composite beams considering slippage effect is proposed. The calculated results are in good agreement with the experimental results, which can provide reference for the researchers and designers of composite beams.