In order to determine validity and applicability of numerical simulation for fracture process of fully-graded concrete beam under bending load using the cohesive interface element method,based on the basical theory of cohesive crack model,random aggregate model was generated in the central region of concrete beam with Monte-Carlo method, then cohesive interface elements were embedded inside mortar and interface (aggregate-mortar)finite element meshes by self-compiled program. Fully-graded mesoscopic concrete beam was numerically simulated in the process of bending fracture,the numerical results were in good agreement with those obtained in the literature.The research results indicate that it is an efficient method to simulate the mesoscopic bending fracture process of concrete materials and macro-mechanical properties.%为确定预插粘性界面单元法模拟全级配混凝土梁在弯拉荷载作用下断裂破坏过程的有效性和适用性，基于粘结裂缝模型的基本原理，在混凝土梁的中心区域采用Monte-Carlo 法生成随机骨料模型，通过自编程序实现了砂浆单元间和界面处粘性界面单元的预插，对全级配细观混凝土梁的弯拉断裂破坏过程进行数值模拟，模拟结果与相关文献结果吻合良好。研究结果表明：预插粘性界面单元法能够有效地模拟细观混凝土材料的弯拉断裂破坏过程和宏观力学特性。
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