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本文在转动角软化桁架模型和固定角软化桁架模型的基础上提出一种新的钢筋混凝土软化桁架模型——随动角软化桁架模型；该模型认为钢筋混凝土薄膜单元中裂缝的开展方向介于固定角和转动角之间；本文通过对文献 [2]、 [3]、 [4]试验数据分析，建立了钢筋混凝土单元整体和裂缝处的平均剪应力和平均剪应变关系 (τ lt-γ lt、τ 21-γ 21)。本文提出的模型解释了前两个模型存在的问题，并通过与试验数据的比较，验证了本模型的可靠性。
In this paper, a new reinforced concrete softening truss model-follow-up angle softening truss model is proposed based on the model of rotating angle softened truss and the fixed angle softened truss model. The model considers that the crack propagation direction in the reinforced concrete thin-film unit is between fixed Angle and rotation angle. Based on the experimental data of [2], [3] and [4], the relationship between the average shear stress and the average shear strain at the whole and the crack of the reinforced concrete unit is established (τ lt-γ , Τ 21 -γ 21). The model proposed in this paper explains the problems of the first two models and verifies the reliability of the model by comparing with the experimental data.