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为了研究钢筋混凝土结构在复杂荷载作用下裂缝间存在的交互作用,用三维数值分析方法模拟了裂缝交叉特性。采用有限元中弥散裂缝概念,建立了三维多向固定裂缝模型。进行了本构关系检验和试验验证。结果表明:该模型能够分析钢筋混凝土结构多向裂缝问题。通过正六边形截面梁构件变换加载面和加载方式试验,研究分析了裂缝空间交叉的相互影响作用。将三维多向固定裂缝模型应用于上述试验的结果表明:该模型能够较好地分析钢筋混凝土结构三维多向开裂及裂缝交叉扩展过程。
In order to study the interaction between reinforced concrete structures under complex load, the fracture cross-over characteristics were simulated by three-dimensional numerical analysis method. Adopting the concept of dispersive cracks in finite element, a three-dimensional multi-directional fixed fracture model is established. The constitutive relationship test and experimental verification were carried out. The results show that this model can analyze the multi-directional cracks in reinforced concrete structures. Through the experiment of changing the loading surface and the loading method of the hexagonal cross-section beam, the interaction between the cracks in the space is analyzed and studied. The results of applying the 3D multi-directional fixed fracture model to the above experiment show that the model can well analyze the three-dimensional multi-directional cracking and crack propagation of reinforced concrete structures.