考虑损伤滑移效应的钢护筒-混凝土模型界面研究

针对钢护筒钢筋混凝土组合结构的界面力学特征,开发了考虑损伤滑移效应的钢护筒-混凝土界面模型。在分析钢筋混凝土结构受力机理的基础上,对钢护筒和混凝土在三维尺度上的相对运动进行分解,进而建立钢护筒-混凝土界面模型的三维本构关系。选取混凝土的压缩应变作表征混凝土损伤程度的定量指标,并提出量化的计算方法来考虑混凝土的局部受压和滑移的耦合效应对界面荷载传递性能的影响。进行钢护筒-钢筋混凝土组合构件的受压性能试验,通过对比试验结果和模拟结果验证模型的适用性。

Study on interface of steel casing concrete model under effect of damage and slip

In view of the interfacial mechanical characteristics of steel reinforced concrete composite structure,we develop a steel casing concrete interface model with damage and slip effect.Based on the analysis of the force mechanism of reinforced concrete structure,we decompose the relative motion of steel cylinder and concrete on three dimensional scale,establish the three-dimensional constitutive relation of steel cylinder concrete interface model,choose the compressive strain of concrete as a quantitative index to characterize the damage degree of concrete,and put forward a quantitative calculation method to consider the influence of the coupling effect of local compression and slip on the load transfer performance of the interface.We carry out the compression performance test of the steel reinforced concrete composite component,and verify the applicability of the model by comparing the results of the test and the model results.