【摘要】 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。更多还原

【Abstract】 The mechanics of multi-directional cracks was analyzed to study the interactions between different direction cracks occurring at same location in reinforced concrete structures subjected to complex loadings.A 3-D fixed multi-directional crack model was developed and verified through constitutive model tests and simulations.Reinforced concrete beam experiments using regular hexagonal cross section beams were used to study the mechanics of the multi-directional cracking.The 3-D cracks crossed each other as the loadings were applied on different surfaces and at different locations on the reinforced concrete beams.Numerical simulations of these tests were studied using the model.Simulations show that the entire tests including the crack growth and bearing capacity can be accurately analyzed by the model.更多还原